To see the other types of publications on this topic, follow the link: Elevator.
Dissertations / Theses on the topic 'Elevator'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 dissertations / theses for your research on the topic 'Elevator.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
1
Malmström, Tore, and Carl Göransson. "Lightweight elevator : A portable elevator capable of climbing rooftops." Thesis, KTH, Mekatronik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-295794.
Full textAbstract:
The purpose of this project is to design and construct a portable lightweight elevator for transportation of goods to rooftops. The elevator should be easy to transport, assemble and disassemble, it should also be useful at various heights and for a wide range of roof inclinations. The elevator contains a railway consisting of four separable modules. A carriage rides the railway and is pulled to the top with a winch powered by a DC-motor. The carriage starts and stops using a Rocker switch and a Hall sensor that detects magnets placed at the end and beginning of the railway. After performing tests with the elevator the conclusion is that the elevator is practical to assemble and transport, but the carriage derails too easily when the railway has angular changes.Målet med projektet är att designa och konstruera en portabellättviktshiss som kan transportera gods från marknivå till hustak. Den ska vara lätt att transportera och att montera ner och upp, den ska också gå att anvåanda för olika höjder och på hus med olika taklutningar. Hissen består av en räls som går att ta isär i fyra olika delar. En vagn åker på fyra hjul uppför rälsen och lyftkraften kommerfrån en vinsch som drivs av en likströmsmotor. Vagnen kan starta och stanna med hjälp av en knapp, den stannar även automatisk då en hallsensor på vagnen känner av magneter som är placerade vid början och slutet av rälsen. En arduino Uno skickar signaler mellan de elektriska komponenterna och motorn får ström via en H-brygga, vilket gör att den kan rotera i båda riktningarna. Efter att hissen testats kan det konstateras att konstruktionen är enkel att bygga ihop och smidig att fästa vid olikavinklar och höjder. Däremot spårar vagnen ofta ur då hissen körs med för branta vinklar mellan de olika delarna av rälsen.
2
Axelsson, Johanna, and Sarah Bernelind. "Elevator Control Strategies." Thesis, KTH, Skolan för datavetenskap och kommunikation (CSC), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-134900.
Full textAbstract:
The purpose of this essay is to investigate if it is eective to switch strategies for elevators during one day in an oce building. This essay describes some of the strategies in use today, followed by a comparison and analysis of two of the strategies described. We have also implemented optimizations to one of these strategies. From our test results we can conclude that our optimized strategy worked and produced better results on average waiting time and total traveling time than the two strategies we previously implemented and that it is not necessarily eective to completely change strategies but change parts of them depending on the trac ow.Syftet med denna rapport ar att undersoka om det ar eektivt att byta strategi for hissar i en kontorsbyggnad under en dags olika trakoden. Forst beskrivs nagra av de vanligaste strategierna, vilket foljs av en jamforelse och analys av tva av dessa. For att kunna jamfora dessa strategier har en implementation av ett program som simulerar en byggnad med hissar gjorts. I programmet anvands sedan dessa strategier for att ta fram testresultat. Den mest eektiva av dessa tva strategier har optimerats och jamforts ytterligare med de tidigare resultaten. Testresultaten visar att den optimerade strategin var den mest eektiva med avseende pa genomsnittsvantetiden och den totala genomsnittsrestiden, och att det inte ar nodvandigt att helt byta strategi under dagen, men att det lonar sig att optimera delar av den, beroende pa trakodet
3
Ceder, Frederick, and Alexandra Nordin. "Elevator Control Strategies." Thesis, KTH, Skolan för datavetenskap och kommunikation (CSC), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-134902.
Full textAbstract:
This paper investigates the efficiency of known elevator control strategies by simulating these in an own made apartment simulator. Efficiency will be determined by the lowest product of the energy consumption (Watt/second), average waiting time, average transfer time and the maximum waiting time of a passenger, which is the output by the simulator. The apartment simulator will simulate the elevator behavior, according to a respective control strategy, and the passenger flow on each respective floor in a specific test scenario. In this test scenario, passengers always travel either to the ground floor or to their respective home floor to simulate an apartment complex on a workday. The outcome of the investigation was that a control strategy that would prioritize elevator orders, i.e. calls made from inside the elevator, remember calls and collect passengers that are on route was the most efficient, both in terms of low energy consumption and passenger satisfaction (low transit and waiting times).
4
Дем'яненко, Р. А. "Методика і технологія геодезичного забезпечення геометричних параметрів ліфтових комплексів висотних споруд." Thesis, Київський національний університет будівництва і архітектури, 2011. http://elar.nung.edu.ua/handle/123456789/1934.
Full textAbstract:
Запропоновано методику попереднього розрахунку точності геодезичних робіт при будівництві ліфтових шахт.
Розроблено технологію та методику визначення геометричних параметрів ліфтових шахт з використанням електронних тахеометрів.
Вдосконалено технологію визначення геометрії ліфтової шахти з використанням наземного фотограмметричного знімання.
Розроблено технологію та методику визначення геометрії ліфтових шахт з використанням наземного лазерного сканування.
Розроблено методику розрахунку точності геодезичних робіт при монтажі ліфтового устаткування з використанням теорії розмірних ланцюгів.
Розроблено методику визначення допустимості відхилень геометричних параметрів ліфтової шахти для монтажу технологічного устаткування.
Виконано дослідження методів оптимізації розташування ліфтового устаткування в контурі ліфтової шахти.The method of preliminary calculation of accuracy of geodesic works is offered at building of elevator mines. Technology and method of determination of geometrical parameters of elevator mines is developed with using of total station. Technology of determination geometry of elevator mine is improved with the use of close-range photogrammetry. Technology and method of determination of geometrical parameters of elevator mines is developed with the use of terrestrial laser scanning. The method of calculation of accuracy of geodesic works is developed at editing and exploitation of elevator equipment with the use of theory of size chains. Technology and method to controlling position of technological equipment is offered with using of total station and automatized systems. The method for determination admission rejections of geometrical parameters of elevator mine is developed. Optimization methods (the mathematical programming and least squares) for location elevator equipment inside mine are researched.
5
Simonsson, Jesper, and Janne Selkälä. "Scheduling of Maglev Elevators : Simulating multiple elevator cars in a two shaft system." Thesis, KTH, Skolan för datavetenskap och kommunikation (CSC), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-166725.
Full textAbstract:
Elevator systems have been quite similar for more than a hundred years and it has only quite recently become more feasible to have elevators being able to switch shafts allowing the construction of a system with more than two elevator cars in a single shaft. Such a system is to be constructed and tested during 2016 and functions using magnetic levitation technology. This new system calls for new algorithms to schedule the assignment of the passengers’ calls. Different strategies based on the collective control algorithm were developed to schedule the maglev system. The strategies were tested in a simulation of a twenty-five floor building and compared to a traditional system of one elevator car per shaft using the collective control scheduling strategy. The results show that in two out of the three scenarios simulated the maglev system performs better than the traditional system when average waiting time and average traveling time are compared. The traditional system beats the maglev system by a lot under the interfloor traffic scenario and adding more elevator cars improved the maglev systems performance but not enough to be as good as the tradition system. The conclusions drawn are that it is hard to schedule the maglev system to spread the cars out. It is also clear that the maglev system requires more elevator cars or improved scheduling to perform as well as the traditional system during the interfloor traffic scenario but is performing equally well or better during the up and down-peak scenarios. Further simulations are required to confirm these conclusions as the schedulers used are quite simple.
6
Gulec, Mustafa Alpertunga. "Vector Controlled Elevator Drive." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/2/12607186/index.pdf.
Full textAbstract:
In this thesis, a practical vector controlled elevator drive is presented. Indirect vector control of induction machine is investigated in theory and then implemented. Control technique is compared with scalar control and induction machine is compared with dc motor. The operation of the system depends on induction machine parameters, so how to accurately and automatically obtaining of the parameters is also presented. Finally, the elevator system is introduced, the application of this control system to the elevator system is described and a basic elevator control system is simulated.
7
Cohen, Stephen S. 1981. "Dynamics of a space elevator." Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=99753.
Full textAbstract:
The space elevator offers an alternate and very efficient method for space travel. It will have two main components. The first component is the tether (or the ribbon), which extends from the Earth to an equatorial satellite at an altitude of about 100,000 kilometres, and is fixed to a base on the surface of the Earth at its lower end. The second component is the climber, which scales the ribbon, transporting payloads to space. An important issue for effective operation of the space elevator will be to understand its dynamics. This thesis attempts to develop a realistic and yet simple planar model for this. Both rigid and elastic ribbon models are considered. Their response to ascending climbers and to aerodynamic loads is studied. Specific climbing procedures are devised based on these results. The effect of the space elevator's motion on the orbit of a launched satellite is also examined.
8
Mesinovic, Elvedin, and Ermin Ceric. "Development of plumb elevator shaft." Thesis, Linnéuniversitetet, Institutionen för maskinteknik (MT), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-35768.
Full textAbstract:
This degree project is the final part of the bachelor in mechanical engineering at Linnaeus University in Växjö. The project has been accomplished at ALT Hiss AB in Alvesta. The company manufactures hydraulic elevators, less traction elevators and escalators. The purpose of this thesis has been to design a tool that plumbs the elevator shaft. The thesis has been completed with literature studies, interviews and data collections. The final concept sketch and idea drawing is presenting the result.
9
Sanin, A. I. "The invention of an elevator." Thesis, Сумський державний університет, 2014. http://essuir.sumdu.edu.ua/handle/123456789/34912.
Full textAbstract:
One of the unique inventions that most of us use every day , is an elevator. This lifting device so entered into the life that few people think about . how great its value. Most ancient lifting device - a prototype of an elevator lift is one of the ancient Roman city of Herculaneum houses , which is at the foot of Mount Vesuvius , Pompeii and the like , became its victim. During excavations in the house there were found well preserved elements of the lift, which served to raise the cooked food from the kitchen to the dining room located above it . The find is dated year 79 BC - the year the eruption of Vesuvius . The lift was powered by muscle power .
When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/34912
10
Blades, Christoffer, and Filiz Boyraz. "Elevator Supervisory Group Control systems : Analyzing the performance of elevator assignment algorithms in varying environments." Thesis, KTH, Skolan för datavetenskap och kommunikation (CSC), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-166467.
Full textAbstract:
Elevators are used every day and that puts expectations on how fast an elevator can handle passenger requests. This report aims to describe different elevator assignment algorithms for Elevator Supervisory Group Control (ESGC) systems and compare them to each other, with an emphasis on the delay time. To research the field of ESGC systems four different algorithms were chosen and implemented: Simple control, Zone control, Collective control and Fuzzy control. The algorithms were also chosen in such a way that their strategies differentiated from each other to some degree. The algorithms were then tested under conditions similar to an office building with interfloor traffic. Five different test cases demonstrated the performance and behavior of the strategies in varying environments. While Collective control proved to have a consistent performance, the more calculated Fuzzy control had the best statistical results. Zone control was the most affected by challenging conditions such as high traffic in the building. Simple control divided the workload equally, but did not make suitable elevator assignments.Hissar används varje dag och det skapar förväntningar på hur snabbt en hiss kan hantera passagerarresor. Den här rapporten ämnar beskriva olika hisstilldelnings-algoritmer för Elevator Supervisory Group Control (ESGC) system och även jämföra dessa med varandra, med tyngdpunkt på fördröjningstiden. För att undersöka ämnesområdet ESGC system valdes och implementerades fyra olika algoritmer: Simple control, Zone control, Collective control and Fuzzy control. Algoritmerna valdes ut på ett sätt, så att deras strategier skilde sig åt till en viss grad. De testades sedan i en miljö som efterliknar ett kontorshus med trafik mellan våningar. Fem olika testfall demonstrerade prestationer och beteenden hos strategierna i varierande miljöer. Collective control hade bevisligen konsekvent prestation, medan den kalkulerande Fuzzy control åstadkom de bästa statistiska resultaten. Zone control påverkades i högst grad av utmanande förhållanden, såsom hög trafik i byggnaden. Simple control delade upp arbetsmängden jämnt mellan hissarna, men lyckades inte med att göra lämpliga hisstilldelningar.
11
Lai, Po-wah. "Total quality management : a study of its applications to customer services in a Hong Kong elevator company /." Hong Kong : University of Hong Kong, 1996. http://sunzi.lib.hku.hk/hkuto/record.jsp?B1800314X.
Full text
12
Desai, Sasi Bharath. "Discrete Event Simulation of Elevator Systems." Scholarship @ Claremont, 2012. http://scholarship.claremont.edu/cmc_theses/343.
Full textAbstract:
The intent of this paper is to present the reader with a simple comparison of two systems of vertical transportation. Vertical transportation is a a relatively new field and is the subject of much interest in today's world. As buildings get taller and real estate becomes more expensive, the need to find a quick, efficient system with a small footprint becomes important. By performing a simulation and subjecting the two systems under study to similar traffic conditions, one can determine the effectiveness of one system relative to the other. Additionally, we look at the effects of changing various system attributes to gain a better understanding of the primary drivers of average travel time.
13
Webb, Colin. "A continuous flow elevator to lift ore vertically for deep mine haulage using a cable disc elevator." Thesis, Federation University Australia, 2020. http://researchonline.federation.edu.au/vital/access/HandleResolver/1959.17/175285.
Full textAbstract:
Vertical continuous ore haulage with elevators in mining for deep haulage is virtually non-existent. In this, research investigations concentrated on a cable disc elevator. The problem of using a cable disc elevator is the friction between the elevator fixed tube and the moving ore on the disc. This research establishes the friction forces existing as the elevator cable and discs are elevated up a stationary tube. Then the focus is to find a way to eliminate that friction. The method involved developing three test rigs: Test Rig 1 measures static friction with the ore placed on a disc in a tube mounted on load cells to measure the resistance with the ore on the disc lifted by a counterweight. This is relevant for an elevator that has stopped under load. Test Rig 2 measures the dynamic friction in an operational 5-inch elevator with the tube on the lifting side held stationary by load cells when the cable discs are lifting the ore. Test Rig 3 eliminates friction in the lifting tube by using a pipe conveyor that travels vertically at the same speed as the cable disc elevator to contain the ore on the cable disc elevator. The cable disc elevator does all the ore lifting. The research generated results for static and dynamic friction for gravel, granite and coal. Cable tension required for ore lift of 1000 metres and the maximum hoisting distance for some existing cables are calculated. Implications of this research are that the cable disc elevator has the potential to haul from depths greater than existing elevators, has a small footprint in a mine, and with some further development could eliminate the need for truck haulage in open cut and underground mining from the mine.Doctor of Philosophy
14
Löf, Marcus, and Elias Andersson. "Impact of Machine Learning on Elevator Control Strategies : A comparison of time efficiency for machine learning elevator control strategies and static elevator control strategies in an office building." Thesis, KTH, Skolan för datavetenskap och kommunikation (CSC), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-166399.
Full textAbstract:
Elevators are used in a large amount of buildings all over the world for fast and comfortable transportation. Today it is becoming increasingly important for people and products to be time efficient, and with technological development new solutions are created to answer this rising demand. To do this in an elevator context, elevator control strategies are implementedas optimal as possible. Machine learning is a relatively new concept, but it is already used in attempts to improve the performance of elevator control strategies. In this report the impact of machine learning on elevator control strategies is investigated in terms of average squared waiting times for the users. Machine learning algorithms can learn from both the current and past environments. The impacts of these two environments are also investigated. Three static elevator strategies and two versions of a machine learning elevator control strategy are implemented and run through a simulator. The results of the investigation show that machine learning has a significant impact on elevator control strategies and is proven to increase time efficiency with at least about 12.5%. Another conclusion drawn is that the current environment is most valuable in the user travel pattern down-peak, while information about previous days especially can improve the performance in the user travel pattern up-peak.
15
Leung, Shui-cheung. "A study of safety in lift industry /." Hong Kong : University of Hong Kong, 1998. http://sunzi.lib.hku.hk/hkuto/record.jsp?B25948106.
Full text
16
Effati, Shayan, and Donia Alipoor. "A Comparison of Traditional Elevator Control Strategies." Thesis, KTH, Skolan för datavetenskap och kommunikation (CSC), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-166689.
Full textAbstract:
The purpose of this paper is to investigate which of a specific set of elevator control strategies that is the most time efficient from the passenger’s point of view in a specific office building. The paper first goes through five different strategies and approaches, followed by results from a simulation of some of the strategies and their combinations. From the test results, it can be concluded that one strategy works best for all possible scenarios during a regular working day, both regarding the average waiting time for a passenger as well as the average travel time. The most optimal strategy implemented can be further optimized for more precise results, but it will not change the outcome of the comparison.
17
Woo, Pamela. "Satellite placement using a partial space elevator." Thesis, McGill University, 2009. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=115992.
Full textAbstract:
The space elevator has been proposed as an alternate method for launching cargo into space. However, the construction of such a structure requires a material much stronger than any currently in existence. Instead, a partial elevator is considered for satellite placement. In the first part of the thesis, the fundamentals of very long tethered systems are studied. From static analysis on a simple two-body system, it is demonstrated that an assumption made in the conventional analysis does not apply to very long tethered systems. For a uniform tether, the axial stress distribution is obtained. Following the Lagrangian approach, the equations of motion governing the planar librations of a multi-body tethered system are derived. From a linearization of these equations, the libration frequencies are found. Then, by solving the nonlinear equations numerically, the responses to various changes in the system parameters are determined. In the second part of the thesis, the use of a partial elevator in satellite placement is studied. In the case of single climber transit, residual librations occur, which alter the shape and size of the orbit of a satellite launched from the climber. An approach using two climbers is investigated in order to decrease the residual libration and thereby reduce orbit placement errors. Also, some energy calculations are done to determine whether the partial elevator offers significant advantages.
18
Jansson, Anton, and Lingvall Kristoffer Uggla. "Elevator Control Using Reinforcement Learning to Select Strategy." Thesis, KTH, Skolan för datavetenskap och kommunikation (CSC), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-166562.
Full textAbstract:
In this thesis, we investigated if reinforcement learning could be applied on elevator systems to improve performance. The performance was evaluated by the average squared waiting time for the passengers, and the buildings considered were apartment buildings. The problem of scheduling elevator cars is an NP-hard problem, and no optimal solution is known. Therefore, an approach where the system learns a strategy instead of using a heuristic, should be the easiest way to get near an optimal solution. A learning system was constructed, where the system was trained to use the best scheduling algorithm out of five in a given situation, based on the prevailing traffic. The purpose of this approach was to reduce the training time that was required in order to get good performance and to lower the complexity of the system. A simulator was then developed, in which the different algorithms were implemented and tested in four different scenarios, where the size of the building and the number of elevator cars varied. The results generated by the simulator showed that reinforcement learning is a great strategy to use in buildings with 16 floors and three or four elevator cars. However, reinforcement learning did not increase the performance in buildings with 10 floors and two to three elevator cars. A possible reason for this is that the variation in performance between the different scheduling algorithms was too small in these scenarios.I denna rapport har vi undersökt huruvida reinforcement learning är användbart för att öka prestandan för hissystem i lägenhetshus. Prestandan bedömdes efter de genomsnittliga kvadrerade väntetiderna för resenärerna. Schemaläggningsproblemet för hissar är NP-svårt och ingen optimal lösning är känd. Att lösa problemet med hjälp av ett system som lär sig hur det ska agera, bör således vara en enklare strategi för att komma nära den optimala lösningen än att använda sig av en heuristik. Ett självlärande system konstruerades, där systemet tränades att använda den bäst lämpade schemaläggningsalgoritmen med avseende på rådande trafikförhållanden. Det fanns totalt fem olika algoritmer att välja bland. Anledningen till att detta gjordes i stället för att systemet skulle lära sig en komplett strategi, var för att sänka träningstiden som krävdes för att åstadkomma bra resultat och för att minska komplexiteten. En simulator utvecklades sedan, där de olika algoritmerna implementerades och testades på fyra olika scenarion, där storleken på byggnaden och antalet hissar varierade. Resultaten som genererades visade att reinforcement learning fungerar utmärkt på byggnader med 16 våningar och tre eller fyra hissar. På byggnader med tio våningar och två till tre hissar är det dock inte lika användbart och där bör i stället enklare algoritmer användas. En möjlig förklaring till detta är att prestandaskillnaderna mellan algoritmerna var för små under dessa scenarion.
19
Борисенко, Олексій Андрійович, Алексей Андреевич Борисенко, Oleksii Andriiovych Borysenko, and О. П. Зайченко. "Управляющая система лифта повышенной надёжности." Thesis, Видавництво СумДУ, 2005. http://essuir.sumdu.edu.ua/handle/123456789/17600.
Full text
20
Pommer, Paul. "A look at elevator charateristics and basis values." Thesis, Kansas State University, 2013. http://hdl.handle.net/2097/16980.
Full textAbstract:
Master of AgribusinessDepartment of Agricultural Economics
Mykel Taylor
The agricultural commodity market has been experiencing previously unseen high prices in recent years. This new era of prices brings with it new challenges within agriculture for farmers and grain buyers within agriculture. This research explores the basis values of hard red winter wheat in Kansas and the elevator characteristics that provide a competitive advantage for elevators buying wheat in Kansas. This research explores hard red winter wheat basis values from elevators located around Kansas from 2002 to 2013. Two hundred twenty eight locations from around Kansas were used in the research. These locations provided the price data that was used for this research. The elevator characteristics used in the research were collected from the Kansas Grain and Feed Directory and the Burlington Northern-Santa Fe and Union Pacific railway companies. Five elevator characteristics were researched that may have a significant impact on an elevators basis. These characteristics are thought to provide a competitive advantage to the location in the form of stronger or narrower basis bids to the farmer, giving the farmer a higher price for his grain. The characteristics researched included elevator capacity, transportation capabilities, elevator terminal status, shuttle loading status, and cooperative or investor-owned business structure. Each characteristic was compared against their counterpart. For example, a location is either a shuttle loader or it is not. The research provides grain companies and farmers some data that they may find useful in marketing grain and setting basis levels in the ever changing and volatile market place in today’s grain industry.
21
MENAPACE, MARCO. "Artificial Intelligence for Automated Design of Elevator Systems." Doctoral thesis, Università degli studi di Genova, 2021. http://hdl.handle.net/11567/1043027.
Full textAbstract:
Configuration and design of complex products represents a challenge
in many application fields. The designer must take into account many
different aspects and make decisions typically driven by experience while
taking into account performance constraints and costs. Methods and tools
for design automation represents a viable solution to such complex decision
problems, giving also the possibility to optimize the performance of the final
product on particular context-driven aspects. Artificial intelligence (AI)
algorithms can help in dealing with complexity and enhance the current
tools by supplying solutions in feasible time.
My research is concerned with the development and testing of different
artificial intelligence (AI) techniques to automate the design of elevators.
Elevator design is a problem with many interesting aspects like the need to
deal with a hybrid search state space (continuous and discrete variables)
constrained by design requirements and safety regulations. The study,
design and integration of AI techniques in this particular application field
can provide the end user with design automation tools that output feasible
solutions within acceptable computation times.
My research considered AI techniques such as special-purpose heuristic
search, genetic algorithms and constraint satisfaction to solve elevator
configuration problems. I tested them considering different setups and
parts of the whole design process. I have also implemented a tool L IFT C REATE ,
available as a web application. L IFT C REATE leverages the findings of
my research to automate the design of elevators and, to the best of my
knowledge, there is currently no similar tool publicly available from either
academia or industry that provides the same level of design automation.
22
Rildova. "Seismic Performance of Rail-Counterweight System of Elevator in Buildings." Diss., Virginia Tech, 2004. http://hdl.handle.net/10919/11259.
Full textAbstract:
Elevators serve a critical function in essential facilities such as hospitals and need to remain operational during and after earthquakes. However, they are still known to malfunction during earthquakes even after several design and sensing improvements required by the current code have been incorporated. Most of the damages were experienced or caused by the rail-counterweight system. Being the heaviest component of an elevator, the counterweight induced strong dynamic effects to the guiding system sometimes even collided and damaged the passenger car.
A realistic analytical model of rail-counterweight system of an elevator that includes details of the supporting system is developed in this study. The nonlinearities caused by closing of the code specified clearances play an important role in determining the dynamic behavior of the system, and are thus included in this study. Also included are the acceleration inputs from different floor of building and the effect of different location of the counterweight along the guide rail. Parametric study is carried out to investigate the effect of different parameters on the seismic responses of the rail-counterweight system.
In order to improve the seismic performance of the rail-counterweight system, several protective schemes are investigated. One simple approach is to increase the damping of the system using additional discrete viscous dampers. However, there is not much space available for installing the devices, and placement parallel to the spring at the roller guide assemblies is not quite effective due to contact between the restraining plate at the roller guide assemblies and the rail that makes the roller guides ineffective.
Another method is to convert the top part of the weights into a tuned mass damper. This method can reduce the maximum stress in the rail if designed properly. The effectiveness of the passive tuned mass damper can be improved further by using it in an active mode by installing an actuator between the mass damper and the counterweight frame. The numerical results that confirm the effectiveness of such an active tuned mass damper are presented. As an alternative to the fully active control scheme, a semi-active control scheme using a magnetorheological damper device between the mass damper and the frame is also studied. This control approach is found to be as effective in reducing the seismic response as a fully active scheme. Since this MR damper can be operated using a simple battery, the external power requirements for implementation of this approach are quite minimal.Ph. D.
23
Jordaan, Edzard Adolf Biermann. "Intelligent elevator control based on adaptive learning and optimisation." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/95999.
Full textAbstract:
Thesis (MEng)--Stellenbosch University, 2014.ENGLISH ABSTRACT: Machine learning techniques have been around for a few decades now and are being established as a pre-dominant feature in most control applications. Elevators create a unique control application where traffic flow is controlled and directed according to certain control philosophies. Machine learning techniques can be implemented to predict and control every possible traffic flow scenario and deliver the best possible solution. Various techniques will be implemented in the elevator application in an attempt to establish a degree of artificial intelligence in the decision making process and to be able to have increased interaction with the passengers at all times. The primary objective for this thesis is to investigate the potential of machine learning solutions and the relevancy of such technologies in elevator control applications. The aim is to establish how the research field of machine learning, specifically neural network science, can be successfully utilised with the goal of creating an artificial intelligent (AI) controller. The AI controller is to adapt to its existing state and change its control parameters as required without the intervention of the user. The secondary objective for this thesis is to develop an elevator model that represents every aspect of the real-world application. The purpose of the model is to improve the accuracy of existing theoretical and simulated models, by modulating previously unknown and complex variables and constraints. The aim is to create a complete and fully functional testing platform for developing new elevator control philosophies and testing new elevator control mechanisms. To achieve these objectives, the main focus is directed to how waiting time, probability theory and power consumption predictions can be optimally utilised by means of machine learning solutions. The theoretical background is provided for these concepts and how each subject can potentially influence the decision making process. The reason why this approach has been difficult to implement in the past, is possibly mainly due to the lack of adequate representation for these concepts in an online environment without the continuous feedback from an Expert System. As a result of this thesis, the respective online models for each of these concepts were successfully developed in order to deal with the identified shortcomings. The developed online models for projected waiting times, probability networks and power consumption feedback were then combined to form a new Intelligent Elevator Controller (IEC) structure as opposed to the Expert System approach, mostly used in present computer based elevator controllers.
AFRIKAANSE OPSOMMING: Masjienleertegnieke bestaan al vir 'n paar dekades en is 'n oorwegende kenmerk in hedendaagse beheertoestelle. Hysbakke skep 'n unieke beheertoepassing, waar verkeersvloei beheer en gerig kan word volgens sekere beheer loso e. Masjienleertegnieke kan geïmplementeer word om elke moontlike verkeersvloei situasie te voorspel en te beheer en die beste moontlike oplossing te lewer. Verskeie tegnieke sal in die tesis ondersoek word in 'n poging om 'n mate van kunsmatige intelligensie in die besluitneming proses te skep asook verhoogte interaksie met die passasiers te alle tye. Die prim^ere doel van hierdie tesis is om die potensiaal van 'n masjienleer oplossing en die toepaslikheid van dit in hysbakbeheertoepassings te ondersoek. Die doel is om vas te stel hoe die navorsing in die veld van die masjienleer, spesi ek in neurale netwerk wetenskappe, suksesvol aangewend kan word met die doel om 'n kunsmatige intelligente beheerder te skep. Die kunsmatige intelligente beheerder moet kan aanpas by sy onmidelike omgewing en sy beheer parameters moet kan verander soos nodig sonder die ingryping van die gebruiker. Die sekond^ere doelwit vir hierdie tesis is om 'n hysbakmodel, wat elke aspek van die werklike w^ereld verteenwoordig, te ontwikkel. Die doel van die model is om die akkuraatheid van die bestaande teoretiese en gesimuleerde modelle te verbeter deur voorheen onbekende en komplekse veranderlikes en beperkings in ag te neem. Die doel is om 'n funksionele toetsplatform te skep vir die ontwikkeling van nuwe hysbakbeheer loso e en vir die toets van nuwe hysbakbeheermeganismes. Om hierdie doelwitte te bereik, is die hoo okus gerig om wagtyd, waarskynlikheidsteorie en kragverbruik voorspellings optimaal te gebruik deur middel van die masjienleer oplossings. Die teoretiese agtergrond is voorsien vir hierdie konsepte en hoe elke konsep potensieel die besluitneming kan beïnvloed. Die rede waarom hierdie benadering moeilik was om te implementeer tot hede, is moontlik te wyte aan die gebrek aan voldoende verteenwoordiging vir hierdie konsepte in 'n aanlynomgewing sonder die voortdurende terugvoer van 'n Deskundige Stelsel. As gevolg van hierdie tesis word die onderskeie aanlynmodelle vir elk van hierdie konsepte suksesvol ontwikkel om die geïdenti seerde tekortkominge te oorkom. Die ontwikkelde aanlynmodelle vir geprojekteerde wagtye, waarskynlikheidsnetwerke en kragverbruik terugvoer is dan gekombineer om 'n nuwe intelligente hysbakbeheerder struktuur te skep, in teenstelling met die Deskundige Stelsel benadering in die huidige rekenaar gebaseerde hysbakbeheerders.
24
Wisner, Michael. "Competitive factors affecting the expansion of Greenfield elevator sites." Thesis, Kansas State University, 2011. http://hdl.handle.net/2097/16176.
Full textAbstract:
Master of AgribusinessDepartment of Agricultural Economics
Michael A. Boland
The purpose of this thesis is to identify Greenfield grain facility sites within 100 miles of Holdrege, Nebraska and to evaluate the feasibility of these sites. CHS Agri Service Center currently has facilities that are within 50 miles of Holdrege, Nebraska. However there are no Greenfield sites in this area that would be feasible due to a large number of competitors already operating in this area. This problem was broken down into two components. The first is site selection and the second is a financial model using net present value to determine if the sites selected would be profitable to the standards that CHS, Inc. requires (12% or better return on assets). In order to determine where Greenfield sites might be located supply and demand factors were evaluated to determine surplus and deficit grain areas. The areas where there were large surpluses of grain have the greatest potential for a Greenfield facility to succeed. Then a feasibility analysis of the chosen sites is conducted using net present value and internal rate of return analysis to determine if there is enough grain volume to operate the grain facility above the 12% return on assets criterion. After a detailed review of the supply and demand factors of grain in the region, two locations were determined to be good candidates for further study. Based on recent projects completed at CHS, Inc. two model facilities were created as tools to determine if a certain facility type is more profitable than another. The cost structures for these two model facilities are based on costs that are currently incurred at CHS Agri Service Center locations. It was found that neither facility at either location was profitable enough to meet the minimum performance criteria required by CHS, Inc. As a result of these findings it may be possible to move ahead with a Greenfield facility at one of these sites if a higher volume can be obtained. A merger with another grain company in the immediate area of the proposed facility may be the best way to increase volume.
25
Chamberlain, Rachel P. "Articulations of Liberation and Agency in Yanagi Miwa's "Elevator Girls"." Digital Archive @ GSU, 2012. http://digitalarchive.gsu.edu/art_design_theses/102.
Full textAbstract:
Miwa Yanagi’s Elevator Girls series, a collection of glossy photographs featuring groups of similarly clad women lingering in expansive, empty arcades, made its international debut in 1996. While the pieces garnered positive reactions, Yanagi found that most Western viewers read her work as predominantly “Oriental”—confirming stereotypes of a highly polished techno-topic Japan that was still negotiating gender equality.
In this thesis, I explore alternative ways of reading Yanagi’s Elevator Girls series, which, I argue, call attention to myopic views of commercialism and identity in order to provide an alternative reading of these women as agents of transgression and ideological transcendence. Whereas many viewed Yanagi’s works as a comment on capitalist machinations, where consumerism has produced soulless, vapid feminine identities, I focus on the ways in which these women exercise agency without relying on notions of an individualized, unique ego.
26
Mustaza, Seri Mastura. "Modelling and control of a flexible soft robotic uterine elevator." Thesis, University of Surrey, 2018. http://epubs.surrey.ac.uk/849667/.
Full textAbstract:
Current laparoscopic techniques for achieving a safe hysterectomy rely heavily on manipulating and stabilizing the uterus using a transvaginal uterine elevator. Commercially available uterine manipulators are rigid in design and lack attributes like flexibility for pose control, force sensing or ease of adaptability. The current technique in using uterine elevator is to have an assistant manually reposition the uterus in response to the surgeon's command. Inefficient response to these commands, lack of experience, poor commands by the surgeon or fatigue are some of the issues arising from the use of the current manipulation technique. Furthermore, the manipulation of a rigid and stiff uterine elevator could potentially damage the uterine wall. A flexible uterine manipulator which can be controlled remotely whilst the surgeon is sitting at the operating console would be a big step forward in advancing robotic gynaecological surgery. These issues motivate this research on the development of an innovative flexible uterine elevator. This research was aimed at developing pneumatically controlled, octopus inspired robotic exible uterine manipulator, GENTLER (Gynaecological ENdoscopic uTerine eLEvatoR), based on soft continuum mechanism with integrated force and pose sensors. The use of soft robotics technology for practical applications requires modelling of the shape, movement and dynamics of the robot. Based on the literature, efforts in modelling the behaviour of this manipulator have focused mainly on kinematic modelling, while dynamics of the system is poorly studied which restricts the full potential of the technology. Another aspect that remains open is robust or stiffness control design of this pneumatically driven soft tube. Variable stiffness control is of prime importance to achieve the accuracy required to satisfy the desired position and force commands. Therefore, this research focused on the development of material-based dynamic modelling, a novel approach to embody the inherent nonlinearity exhibited by soft continuum manipulator as well as the design of real-time tunable stiffness control. Semi-empirical approach was used, which combined both theoretical modelling and experimental analysis of data obtained in laboratory to develop the model and the control architecture. Finally, the proposed modelling approach and control architecture were implemented into the prototype of GENTLER. The working prototype was validated in real-time using ex-vivo testing.
27
Hoffman, Rachel M. (Rachel Marie). "A Multi-Track Elevator system for E-commerce fulfillment centers." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/111754.
Full textAbstract:
Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2017.Cataloged from PDF version of thesis.
Includes bibliographical references (pages 53-54).
Fulfillment centers located in densely populated urban areas are an ever-growing need for leading online consumer websites. These urban fulfillment centers have limited land mass and must have innovative solutions to transport goods within the available vertical space. This work presents a Multi-Track Elevator (MTE) System, a competitive solution for rapid access and retrieval of goods in high-rise e-commerce fulfillment centers and warehouses. The MTE System consists of multiple vertical rails connected with angular traverse rails that allow multiple carriages to go up and down without collision. A novel turning point system switches track routes so that several carriages can move across the multiple rails for rapidly accessing many floors and collecting diverse goods. Unlike existing vertical-horizontal grid elevators and rail systems, the roller-coaster type, self-powered carriages on the MTE system do not have to stop at switching points, but can continually move across the network of rails. Further, this work describes the architecture of the rail network system and techniques for switching multiple rails, followed by the design of vertical turntables for smooth, continuous rail switching. Finally, outlining the use of a simple route optimization algorithm, diverse elevator systems are compared with respect to total traveling time and distance. A proof-of-concept prototype has been built and is presented.
by Rachel M. Hoffman.
S.M.
28
Tilley, Dennis Ray. "Incidence and spread of insects from bucket elevator leg boots." Diss., Kansas State University, 2013. http://hdl.handle.net/2097/15572.
Full textAbstract:
Doctor of PhilosophyDepartment of Grain Science
Bhadriraju Subramanyam
Mark E. Casada
In commercial grain elevators and feed mills, the boot and pit areas contribute to commingling of insects with grain that moves through the elevator leg. A pilot-scale bucket elevator leg with a modified removable boot, or slip-boot, was used to measure the magnitude of commingling as a function of stored-product insect density and boot holding time in tests with wheat and corn. Pilot-scale tests showed that clean grain transferred over infested boots was infested with about 1 insect/kg when transferred immediately after the boot was infested; this increased to 2 insects/kg after incubating the boot for 8 wk. Larger numbers of kernels with internal infestations were picked up by clean grain during transfer compared with externally infesting insects, because the mobility of the latter enabled them to move away from buckets during transfer. Monthly surveys over two years at elevators and feed mills revealed several stored-product insects in grain residues from the boot and pit areas and bulk load-out samples. Insect densities in the boot and pit areas were impacted by seasonal temperatures and facility sanitation practices. Recommended sanitation guidelines for the boot and pit areas include: (1) boot residual grain clean-out every 30 d, (2) removal of grain spillage and floor sweepings from the pit area, and (3) proper disposal of boot and pit residual grain. Facilities following these sanitation guidelines could avoid costly grain discounts, increase income of the business operation and minimize or prevent cross contamination of clean grain by infested grain in the boot and pit areas.
29
Gunér, Gustaf, and Adibbin Haider. "A comparative study of time efficiency in traditional elevator systems." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-229770.
Full textAbstract:
There are numerous of people that work in office buildings. For many of them, using an elevator is a daily practice. Being able to access a time efficient elevator is therefore of great interest for many people. Having to spend unnecessary time either inside an elevator or waiting for the elevator to arrive to you is not something that people appreciate. In order to achieve an efficient elevator, the elevator control system needs to be optimized for building that the elevator will be used in. This thesis investigates the time efficiency of two different traditional elevator control systems in a small office building in order to find out which of them that is the most time efficient. In order to compare the two elevator control systems a simulator was developed in Java. The simulator simulated one year of elevator usage in an office building with one elevator, 10 floors and 100 persons. The results of the simulation show that the usage of a non-directional collective control system (NDCCS) caused an approximately 66% shorter average waiting time, an approximately 5% longer average travel time making the average total time 54% shorter than when using a full collective control system (FCCS). The conclusion was that the NDCCS was the most time efficient in this specific building.Det är många personer som arbetar i kontorsbyggnader. Många av dem använder en hiss dagligen. Det ligger därför i mångas intresse att ha tillgång till en tidseffektiv hiss. Folk gillar inte att spendera onödig tid varken i hissen eller när man väntar på att hissen ska komma till en. För att uppnå en tidseffektiv hiss krävs det att hissen använder sig av ett styrsystem som är optimerad för just den byggnaden som hissen befinner sig i. Denna avhandling undersöker tidseffektiviteten hos två olika traditionella styrsystem för hissar i en liten kontorsbyggnad för att ta reda på vilken av dem som är mest tidseffektiv. För att kunna jämföra de olika styrsystemen utvecklades en simulator i Java. Simulatorn simulerade ett års användning av en hiss i en kontorsbyggnad med en hiss, 10 våningar och 100 personer. Resultaten från simuleringen visade att användandet av styrsystemet non-directional collective control system (NDCCS) orsakade en ungefär 66% kortare genomsnittlig väntetid, en ungefär 5% längre genomsnittlig restid vilket gjorde att styrsystemet fick en 54% kortare total genomsnittlig tid än när styrsystemet full collective control system (FCCS) användes. Slutsatsen var att NDCCS var det mest tidseffektiva styrsystemet i denna specifika byggnad.
30
Boac, Josephine Mina. "Quality changes, dust generation, and commingling during grain elevator handling." Diss., Manhattan, Kan. : Kansas State University, 2010. http://hdl.handle.net/2097/2373.
Full text
31
Nakamai, Luiz Fellipe. "Calibração do novo dispositivo de ensaio de elevadores dentais para o elevador angulado de Seldin." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/23/23149/tde-22042008-123726/.
Full textAbstract:
Para se entender a biomecânica e implementar avanços nos parâmetros geométricoconstrutivos do elevador angulado de Seldin, foi construído o Novo Dispositivo de Ensaio de Elevadores Dentais (NDEED). Como em um dispositivo de mensuração, foi necessário calibrar-se todo o aparato para garantir que os dados obtidos fossem confiáveis. Para tanto, foram realizados testes estatísticos em relação ao deslocamento angular, torque e deslocamento vertical (LVDT). Para o torque, confrontado com as leituras obtidas, realizou-se o cálculo do índice de correlação linear de Pearson, o qual apresentou valor de 0,99958, indicando alta relação entre os parâmetros avaliados. Em relação ao deslocamento angular e ao deslocamento vertical, o índice de correlação linear de Pearson foi de -0,99995 e 0,99973, respectivamente, indicando alta relação entre as medidas para cada variável. O intervalo de confiança apresentou um erro máximo de ± 0,065 para o torque, ± 1,4 para o deslocamento angular e ± 0,71 para o deslocamento vertical. Com base nos resultados estatísticos, pode-se afirmar que a correlação entre as leituras dos aparelhos e os valores das medidas são extremamente confiáveis, indicando uma ótima relação entre a leitura e a medida. Também foi observado que os intervalos de predição foram pequenos, indicando que o NDEED afere com precisão as medidas em análise. Assim, pode afirmar-se que o Novo Dispositivo de Ensaio de Elevadores Dentais é uma excelente maneira de se aferir as variáveis em estudo.In order to understand and optimize the construction of dental elevators, searching for adequate standards, a fully automatic new Elevator Essaying Device has been produced. As in every measurement device, it was a need to calibrate all the apparatus to guarantee that the data obtained was reliable. For this purpose, statistical analysis were used in order to evaluate the angular displacement, torque and vertical displacement. As for the torque, the Pearson\'s linear correlation index was used, with an obtained value of 0,99958, indicating a high relationship between the evaluated parameters. For the angular displacement and the vertical displacement, the value of the Pearson\'s linear correlation coefficient was -0,99995 and 0,99973, respectively. The confidence interval showed a maximum error of ± 0,065 for the torque, ±1,4 for the angular displacement and ± 0,71 for the vertical displacement. Based on the obtained statistical data, it is possible to affirm that the correlation between the readings and the measure values are extremely trustworthy. Also, it was observed that the prediction intervals indicated that the new Elevator Essaying device is able to measure the referred variables.
32
Wareing, Malcolm. "A search for an index of lift traffic performance." Thesis, University of Manchester, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293283.
Full text
33
Tam, Kai-man. "Building international strategic alliances through a network approach /." Hong Kong : University of Hong Kong, 1998. http://sunzi.lib.hku.hk/hkuto/record.jsp?B20262899.
Full text
34
chen, ke-chung, and 陳克群. "Intelligent Elevator Control System." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/06885998753562252489.
Full text
35
Leou, Li-Min, and 柳力民. "Smart Elevator Monitoring System." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/56411019177599422353.
Full textAbstract:
碩士大同大學
資訊工程學系(所)
101
Elevator surveillance systems currently on the market are mostly closed system. They are non-IP-based, expensive, uneasy to use, and could not be integrated with existing computer network. On the other hand, IP-based camera for simple video communication could not do real-time surveillance when security problem exists.. Even real-time detection by people, we could not promise thers is no human negligence which cause the situation not remedied. Our proposed intelligent video processing technology using Android library could read real-time capture image from camera, encode and transmit it. Before transmission, we could detect the image if any changes or not. If it is static, we will not transmit it to save the network traffic. With OpenCV library, we can do many image processing, like people recognition to archive people counting, to know the elevator is overload or not, or detect people are doing dangerous actions or not. Using computer automation software, we could resolve traditional monitoring which requires a lot of manpower. According to the experiments, we found the net flow of Spydroid almost in 200KB/S, no matter we set the different resolution or FPS, not like our system, from 55KB/S to 470KB/S, have a significant change. We can reduce the network flow when there is no change in video, down to 0KB/S, but we didn’t find any mechanism in Spydroid. We also test muti-client cause problem to system or not, and confirm our system still work.
36
Li, Ming, and 黎明. "Elevator system design in spice." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/16116408689122658639.
Full text
37
Jiang, Jheng-Tang, and 姜正唐. "Structural analysis of elevator counterweight." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/3gyeu9.
Full textAbstract:
碩士元智大學
機械工程學系
106
All elevator car and structure of machine-room designs in Taiwan are based on regulations of the Chinese National Standards(CNS).However, there is no relevant laws and regulations as the reference for the structure design method of the counter-weight side, resulting in the diversification and the safety factor has insufficient (resulting in safety problems) or too high (waste of costs) concerns.Most of the Counterweight structure fixed by welding method, which is not flexible for it’s weight and size. For the past few years, welding fumes has become the biggest and most controversial environmental issue of our life. Some elevator manufacturers have improved its structure by changed the way of fixing the counter-weight frame to bolting, in order to meet environmental requirement.For three types of counter-weight frames with the traction ratio of 「1: 1」, and the elevator’s capacity which is 12 and 15 people are used to analyze in this dissertation. By using SolidWorks Simulation software to analyze of stress on each type of counter-weight frame at static maximum loading, from the simulation results and consider structure safety, reliability, the cost and management, the use of bending-combination type as the basis for the design of counter-weight frame. Then by the dynamic loading analysis of elevator operation, the static analysis results are compared to explore the convergence and the correctness of the dynamic analysis results, and analyze the stress generation region, in order to explore the optimization possibility of the bending-combined structure.
38
Hsu, Yung-Chung, and 徐永忠. "Design of The Escape Elevator." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/69658a.
Full textAbstract:
碩士高苑科技大學
經營管理研究所
106
A new design concept for the escape from the elevator is proposed in the paper in accordance with the shortcomings of the current escape design when the elevator is currently in a fire and the malfunction. This is a software and hardware control system developed for special purposes. Or special systems for fire prevention, disaster prevention and evacuation personnel that can be installed on the outside of a building
39
Miranda, Miguel Ângelo Sousa. "Aumento da eficiência de uma linha de soldadura na produção de elevadores." Master's thesis, 2020. http://hdl.handle.net/10316/92195.
Full textAbstract:
Dissertação de Mestrado em Engenharia e Gestão Industrial apresentada à Faculdade de Ciências e TecnologiaO aumento da eficiência das linhas fabris, a melhoria contínua de processos e a eliminação de desperdícios são cada vez mais importantes para empresas que se deparam constantemente com concorrentes. O foco nestes aspetos permite que as empresas se distingam na sua área, adquiram uma vantagem competitiva e prosperem.No caso da Schmitt Elevadores, tal é tido bastante em conta nos núcleos de engenharia, dando esta empresa ênfase à eliminação de desperdícios em todos os seus processos e, consequentemente, à criação de valor, ou seja, ao pensamento lean.Um pensamento lean, aliado às suas ferramentas, permite às empresas, de uma forma bastante visual, simples e rápida, melhorar continuamente todos os seus processos.Tendo em conta estas considerações iniciais, este trabalho aborda precisamente estes aspetos, tendo como objetivo a melhoria de eficiência através desta ideia de criação de valor e, ainda, demonstrar como é possível aplicar algumas destas importantes técnicas no ramo da engenharia de processo/lean manufacturing. Incidirá, especificamente, numa linha de soldadura na produção de elevadores. Pretende-se perceber como esta pode ser melhorada, bem como, as ferramentas a aplicar para aumentar a sua eficiência e as noções e aspetos a ter em conta para o futuro.Será demonstrado como todos estes conceitos, incluindo técnicas básicas de engenharia, se coligam num projeto aplicável em campo, e também como um projeto específico pode ter importantes repercussões nos vários desafios que poderão surgir no quotidiano da vida fabril.
Increasing the efficiency of the manufacturing lines, the continuous improvement of processes and the reduction of waste are increasingly important for companies that face hard market competition. The focus on these aspects allows companies to distinguish themselves in their area, gain a competitive advantage and thrive.In the case of Schmitt Elevators, this is considered in the engineering teams, having this company a focus on eliminating waste in all its processes and, consequently, on creating value, that is, lean thinking.A lean thinking, combined with its tools, allows companies, in a very visual, simple, and fast way, to continuously improve all their processes.Bearing these initial considerations in mind, this work addresses precisely these aspects, aiming to improve efficiency through the idea of creating value, and also demonstrating how it is possible to apply some important techniques in the field of process engineering/lean manufacturing. It will be analyzed specifically a welding line in the production of elevators. It is intended to understand how this line can be improved, as well as the tools to be applied to obtain a more efficient line and the notions and aspects to be considered for the future.It will be demonstrated how all these concepts, including basic engineering techniques, come together in a project applicable in the field, and also as a specific project can have important repercussions in the various challenges that arise in the daily life of the factory.
40
Fan, Chu-Kai, and 范崇愷. "Elevator Dynamic Simulation Using Petri Nets." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/41371855756788488008.
Full textAbstract:
碩士國立成功大學
航空太空工程學系
86
The aim of this dissertation is to realize the elevator discrete event dynamics duo to the traveling request using Petri nets. Based on the proposed representation scheme, the efficiency of elevator group can be analysed. Properties of the Petri nets are introduced. An extended colored Petri net is proposed to construct elevator dynamic model. The proposed single elevator dynamic model can be modularized and extended to multi-elevator cases effectively and efficiently. C- program is used to simulate the elevator dynamics presented by Petri nets. From the simulation results, the key issue to enhance elevator group performance can be further investigated. The methodology and simulation environment provided in this dissertation are beneficial to the study of elevator group scheduling.
41
Chen, Jhih-Jia, and 陳志嘉. "Using Speech Recognition on Elevator Control." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/16226369909204534810.
Full textAbstract:
碩士中華技術學院
電子工程研究所碩士班
96
The research is to apply the speech recognition algorithm to elevator control, so the essential recognition contents are the floor numerals. At first, record the various sounds of the floor numerals of different people as the training speech sounds, then obtain its Mel-frequency cepstral coefficients, and then establish the hidden Markov models of the speech sounds. Finally, perform the Viterbi algorithm with the sound models to obtain recognition result. The experimental results show that the algorithm can work well.
42
Po-HuiHsiao and 蕭博徽. "The Analysis and Research of Taiwan’s Elevator Accident Death in the Case of Elevator Cabin Unintended Movement." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/3q6dfy.
Full textAbstract:
碩士國立成功大學
交通管理科學系碩士在職專班
107
With the industrial development and the significant increase of the residential demand in metropolitan areas, the rising land cost and urban planning brought numerous high-rise buildings. There are over 200,000 elevators running in Taiwan now. However, the ageing problems already cause in much safety concern of elevator operation. Among the death accidents, the most major reason is the unintended movement of elevator cabin. The research investigated the causes, the measures of correction and prevention, and the exploration. Collecting the data from 2003 to 2019, The researcher analyzed the 20 accidental events of elevator unintended movement, and interviewed 10 elevator industry experts in investigating the explanation and improvement measures for the elevator accidental death cases. The main causes are that the elevators were not exactly executed with the maintenance (70% with 14 cases), mechanical component failure(70% with 14 cases), brake device failure (60% with 12 cases), transmission system failure(10% with 2 cases), and electrical system failed and personal factor(each for 30% with 3 cases). Meanwhile, most existing elevators are not equipped with the reserve brake system. Once if the elevator unintended moving, the accident could not be prevented. The researcher propose the government to enforce the regulation with the installation of UCMP elevator protection system in the prevention of the elevator accidents. Key word: elevator, elevator accident, elevator unintended movement, elevator safety equipment, UCMP system Introduction There are over 200,000 elevators running in Taiwan now. However, the ageing problems already cause in much safety concern of elevator operation. The research analyzed the elevator death accidents and discovered that the elevator unintended movement is the major cause. At the early development stage, incomplete regulations and no exact implementation of inspection caused in a very weak mechanism of elevator supervision and management. With the brief introduction of industry development, present market condition, management system, and the elevator design architecture and operating principle, the research explained the severe situation of elevator safety and investigated the solution to minimize the accident frequency. Material and Result The researcher selected the survey method to collect domestic elevator accidents, including the background and situation, and then interfered by induction to analyze the actual root cause. Furthermore, this research proceed 20 case studies of accidents by the elevator unintended movement and 10 expert visiting study to collect more integrated analysis and opinions. The main causes are that the elevators were not exactly executed with the maintenance (70% with 14 cases), mechanical component failure(70% with 14 cases), brake device failure (60% with 12 cases), transmission system failure(10% with 2 cases), and electrical system failed and personal factor(each for 30% with 3 cases). 2003～2019 The Casualties Statistics of Elevator Unintended Movement in Taiwan Area Area Death Injured Shocked Casualties Percentage North 4 3 8 15 30.6% Central 1 3 19 23 46.9% South 5 5 0 10 20.4% East 1 0 0 1 2.0% Total 11 11 27 49 100.0% The Cause of Elevator Unintended Movement Item Cause Number Percentage 1 Mechanical Failed (Brake System) 12 60% 2 Mechanical Failed (Transmission System) 2 10% 3 Electrical Controller Failed 3 15% 4 Maintenance Unimplemented Well 14 70% 5 Inspection Unimplemented Well 1 5% 6 Defective Design 1 5% 7 Personal Facor 3 15% 8 Others 1 5% Conclusion The research discovered that the major cause of elevator unintended movement is its mechanical brake system failed and the equipment maintenance not exactly executed. Most existing elevators are not equipped with the reserve brake system in the prevention of accidents with elevator unintended movement. And the existing elevator ecosystem is not able to clarify the actual safety responsibility and the equipment managers or users are incapable of having enough information to insure the elevator operation safety. The study proposed to establish the retraining and technological exchange mechanism and build up the correct and professional occupational ethics for all the elevator-related workers. The government shall immediately enforce the new regulations and standards to promote the prevention policy of elevator accidents, provide the reimbursement for elevator modernization in urban renewal plan, and found an independent organization to investigate the elevator accidents by incorporating in the traffic safety subject. Re-establishing a strict industry ecosystem would cost a lot of resource from each elevator-related role, including the government, inspection organizations, elevator companies, and professional technicians. However, this is the only way to enhance the elevator operation quality and bring the actual safety to all the elevator passengers and users.
43
Wu, Tzong-Lin, and 吳宗霖. "Real-Time Scheduling for Elevator Group Systems." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/67895255373653133119.
Full textAbstract:
碩士國立成功大學
航空太空工程學系
84
Owing to the rapid economic growth in the recent years, theterritorial price of the city becomes very high , which leads to atendency for developing high-rise buildings. Therefore, an efficientelevator group system is required for handling complex verticaltransportation traffic. In this thesis, four kinds of performanceindexes are used to evaluate the elevator group service performance ;they include time index, energy index, passengers information index,and tolerance index for uncertainty analysis. An important assignmentfactor,which corresponds to passengers information, called distributionpattern of the elevator route ( PATTERN_34 ), is also proposed. The traditional assignment approaches for elevator group systems,which are simple and rough, are only fit for low-rise buildings, hencethey cannot satisfy the complex traffic request in the high-risebuildings. In this thesis, the Score Index Assignment ( SIA ) approachis proposed for the dynamic elevator group scheduling.The results showthat the SIA approach can improve system performance underuncertainties. Different service pattern corresponding to differenttraffic request can be obtained by tuning the assignment parameters.The SIA approach provides a feasible approach to elevator groupscheduling.
44
Huang, Dian-Jhih, and 黃殿智. "Using BPSO in Elevator Group Control System." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/44893688536054917442.
Full textAbstract:
碩士國立東華大學
資訊工程學系
93
Scheduling problem is an important part in artificial intelligence，EGCS(Elevator Group Control System) is a scheduling problem with high complexity. In this thesis，BPSO (Binary Particle Swarm Optimization) is used to find better solutions in all possible scheduling situations because of its fast convergence and rescheduling ability. We found that BPSO shows better performance than GA (Genetic Algorithm) in the analysis results.
45
Chiang, Tsung-Che, and 蔣宗哲. "Design of Modern Elevator Group Control Systems." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/85903453534787686141.
Full textAbstract:
碩士國立臺灣大學
資訊工程學研究所
89
To provide good transportation services for passengers in the modern buildings, a good elevator group control system (EGCS) is inevitably necessary. The viewpoint of designing the EGCS is very important. Passenger-based viewpoint proposed here provides a new way to think about this system. The capacity constraint following the thoughtfulness consideration for the passengers is utilized to make the performance better. Details of elevator dynamics are modeled to meet the requirements. A traffic database is constructed in order to rebuild the system environment containing information of passengers so that it can be made as close to the real environment as possible. The rescheduling ability is achieved by the new mechanism — HCPM refinement, which is a priority maker for hall calls. The advantages of our EGCS are shown through extensive simulation results. We focus on the important components and examine how they affect the performance in our series of simulation experiments. At last, there is a comparison between our EGCS and the previous one, which shows that our results are quite satisfactory and superior.
46
Hung, Yang-Jiun, and 洪揚鈞. "A Study on Elevator Remote Monitoring System." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/2zue3g.
Full textAbstract:
碩士國立彰化師範大學
電機工程學系
106
Recently, due to the technology of IoT, all stand-alone equipment has been developed well and widely used in the field of smart factories, factory automation, and industrial control system. Elevator, a kind of high-safety equipment, needs to be periodically maintained by expert company. Upon emergency, it is necessary to call technician for the troubleshooting. Therefore, IoT is the best way to lighten technicians’ burden. That means elevator could deliver the warning in advance and technicians could replace problematic parts ahead of time for reducing the risk of danger. In this thesis, the structure is a simple and stable control system of IoT. In the base of existing PLC of elevator, it uses multiple transmissions of Human Machine Interface and communication system of PLC to collect the elevator relative information which is delivered to Database System by internet. This kind of remote monitor could grasp elevator status rapidly to improve the elevator safety problems.
47
SHIH, PO-CHENG, and 施柏丞. "Mechanics Analysis of Ball Screw Type Elevator." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/stvr97.
Full textAbstract:
碩士國立雲林科技大學
機械工程系
107
Since 1993, Taiwan has become an aging society. In the future, it is expected to become a super-aging society in 2026. For elder people with stairs in their homes, it will be increasingly inconvenient. Therefore, elevators are more important in home life. In recent years, European countries and the United States have developed home elevator technology. Japan also began to have the small elevator standard. This research focus the small elevator driven by ball screw that under the standard of American Society of Mechanical Engineers (ASME) specification. Such as: maximum load, operating speed, etc. For the stress and deformation of the components in the ball screw type elevator, this research do mechanical analysis to see the changes of stress during running test. The products of the ball screw and linear guideway are based on the domestic manufacturers. The rest of parts are purchased on the market. Afterward the finite element analysis (Ansys Workbench) is used to do the elevator static simulation and use Adams software to do movement simulation. Whether or not the components in this research are in the allowable stress. It is determined by standard of ASME whether there is any possibility of damage. According to the safety factor of every component, the simulated stress values in this research are all within the allowable stress. Therefore, every component will not be damaged.
48
Gillies, Richard. "The Adaptation of a Thunder Bay Grain Elevator." Thesis, 2011. http://hdl.handle.net/10222/13343.
Full textAbstract:
This thesis is an exploration of spatial possibilities within a concrete terminal grain elevator in Thunder Bay, Ontario, Canada. Informed by research into the history, function, and construction of grain elevators, this investigation develops an approach to adaptation that would inhabit the interior spaces while preserving the sense of wonder and intrigue inherent in these structures. Using a program defined only as the most basic requirements for habitation, spatial possibilities are investigated to augment the aesthetic, monumental, and mysterious qualities of the structure, without domesticating it.
49
Lin, Wen-Yan, and 林文彥. "Implementation of the intelligent control system for elevator." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/69917923415465719824.
Full textAbstract:
碩士聖約翰科技大學
自動化及機電整合研究所
96
A novel control system for use with elevator is proposed in this thesis. The proposed control system includes two subsystems: the voice control system and the motor speed control system. The voice control system is based on a voice idendification IC (RSC-300) is designed to control the elevator to track the voice command. With a microprocessor integrated, the voice control system is capable of control the elevator with safe and accurate operation state during the variable conditions. There are four kinds of speed control methods being investigated for use in this thesis: V/f control, vector control, V/f control with speed signal feedback, and vector control with speed signal feedback. In these kinds of speed control methods, vector control with speed signal feedback is chosen as the optimal speed control method of elevator, because of its high stability of voltage and frequency. To verify the effectiveness of the proposed control system, the system is tested on the practical model elevator. Experiments are discussed which demonstrate the effectiveness of the proposed control system. Test results are presented which show that the proposed control system is reliable, economical and easy for implementation.
50
Chih, Yang Sheng, and 楊聖智. "Using Genetic Algorithms to control Elevator Group System." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/09772720412995680097.
Full textAbstract:
碩士國立臺灣師範大學
資訊教育研究所
91
The problem of Elevator Group Control System (EGCS) is how to schedule elevators smartly and continuously in a dynamic and real-time environment. Because it is a concurrent system, slightly differences in system scheduling can produce different results. For example, same test cases may yield different results in average riding time, average waiting time, or crowdedness of passengers. Such phenomenon poses great challenge to EGCS. Because there are too many factors must take into consideration by EGCS, we use Genetic algorithm to control the elevators of EGCS, which has been known as an effective approach to find near-optimal solutions. We implement an elevator simulation system using Java’s multi-threading constructs. On which, we experiment two methods: (1) using Genetic algorithm to schedule the elevators. (2) using shortest distance to schedule the elevators. We compare the results and conclude that the approach using Genetic algorithm yields better results.