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Dissertations / Theses on the topic 'Lawn mower'
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Rickel, Jayson Anthony. "Engineering Senior Design Project: Robotic Lawn Mower." Thesis, The University of Arizona, 2014. http://hdl.handle.net/10150/321922.
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May, George Douglas. "Competitiveness in the South African lawn mower industry." University of South Africa, 2009. http://hdl.handle.net/10500/167.
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Dysenius, Hannah. "Non-Linear Automatic Control of Autonomous Lawn Mower." Thesis, Linköpings universitet, Reglerteknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-129116.
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This master thesis contains modeling and nonlinear automatic control of an autonomous lawn mower. The vehicle shall be able to follow a magnetic field loop buried in the lawn on an arbitrary distance, including straddling. A unicycle model of the lawn mower has been derived based on previous work. The model holds for the assumption of non slip environment. Two diff erent control strategies have been implemented and evaluated in this thesis. One is based on feedback linearization and with the feedback gain estimated using an LQ-controller. The other strategy is based on linearization at an equilibrium point and also with the use of an LQ-controller. The only state that can be measured is the distance to the magnetic loop. In order to estimate the other states, an observer has been implemented using the linearized in an equilibrium point model and a Kalman filter. The navigation of the autonomous lawn mower is performed using a magnetic loop buried in the lawn. The non-linearity of the magnetic field causes diffi culties when estimating the distance to the loop. One magnetic field strength corresponds to two distances to the magnetic loop. The nature of the magnetic field and the measurement noise causes the precision of the controller to be limited. The conclusion of this master thesis is that it is possible to navigate and follow the magnetic loop at a distance greater than 0.3 [m], but with overshoots during sharp turns. If the reference distance is smaller than that, the behavior of the robot will be oscillating when following the loop. The limitations of the controller performance is due to the lack of information which can be extracted from the measurements of the magnetic field.
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Hughes, Bradley Evan. "A Navigation Subsystem for an Autonomous Robot Lawn Mower." Case Western Reserve University School of Graduate Studies / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=case1312391797.
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Baichbal, Shashidhar. "MAPPING ALGORITHM FOR AUTONOMOUS NAVIGATION OF LAWN MOWER USING SICK LASER." Wright State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=wright1334587886.
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Crum, Megan Leigh. "QUANTIFICATION OF EMISSIONS FROM LAWN AND GARDEN EQUIPMENT IN CENTRAL FLORIDA." Master's thesis, University of Central Florida, 2007. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4290.
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The objective of this study was to evaluate the practical limits of EPA s NONROAD 2005 to accurately simulate Central Florida conditions, especially with regard to lawn and garden equipment. In particular we investigated a NONROAD emission inventory using default inputs and then created a locally specific emission inventory. These emission inventories were prepared for Orange, Osceola, and Seminole county and focused only on the VOC and NOx emissions caused by lawn and garden equipment. The model was manipulated to assess its ability to represent this specific category of nonroad equipment for a given airshed first by running a base case scenario using default data and then by developing a locally-specific scenario through administration of a survey. The primary purpose of the survey was to evaluate local values for equipment population, equipment characteristics, activity estimates, and other relevant information. To develop these local input estimates, data were collected concerning population and usage statistics in the Central Florida area and were combined with emission factors, load factors, allocation factors, and other needed values that have been previously established by the U.S. EPA. The results of the NONROAD model were compared with the resulting emission estimates calculated from locally derived inputs, and as a result of the analysis an accurate emission estimate was calculated. In addition, several possible air quality action steps were further assessed according to feasibility, cost, and predicted emission benefit. These potential management projects were further investigated by assessing the success of other similar projects in other cities in an effort to establish specific costs and emission benefits as they relate to the tri-county area.M.S.Env.E.
Department of Civil and Environmental Engineering
Engineering and Computer Science
Environmental Engr MSEnvE
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Sparr, Henrik. "Object detection for a robotic lawn mower with neural network trained on automatically collected data." Thesis, Uppsala universitet, Datorteknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-444627.
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Machine vision is hot research topic with findings being published at a high pace and more and more companies currently developing automated vehicles. Robotic lawn mowers are also increasing in popularity but most mowers still use relatively simple methods for cutting the lawn. No previous work has been published on machine learning networks that improved between cutting sessions by automatically collecting data and then used it for training. A data acquisition pipeline and neural network architecture that could help the mower in avoiding collision was therefor developed. Nine neural networks were tested of which a convolutional one reached the highest accuracy. The performance of the data acquisition routine and the networks show that it is possible to design a object detection model that improves between runs.
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Beno, Jonathan A. "CWRU Cutter: Design and Control of an Autonomous Lawn Mowing Robot." Cleveland, Ohio : Case Western Reserve University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=case1270492619.
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Thesis (Master of Engineering)--Case Western Reserve University, 2010Department of EMC - Mechanical Engineering Title from PDF (viewed on 2010-05-25) Includes abstract Includes bibliographical references and appendices Available online via the OhioLINK ETD Center
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Selling, Jimmy. "Beröringsfria avståndssensorer för en autonomgräsklippare." Thesis, KTH, Mekatronik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-41510.
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SammanfattningExamensarbetet har syftat till att undersöka möjligheten att utrusta Husqvarnas autonomagräsklippare med avståndssensorer. Dessa ska hindra gräsklipparen från att kollidera med hinder i sinomgivning. Gräsklipparen arbetar i en miljö där väder, temperatur, ljusförhållanden och underlagvarierar kraftigt. Detta innebär att kravet på sensorerna är högt.Av de sensorer som undersökts har det visat sig att ultraljud och ”structured light” är de system sombäst skulle kunna uppfylla all dessa krav till ett rimligt pris.I examensarbetet undersöks därför ultraljudssensorer från företaget Maxbotix närmare ochimplementeras i en prototyp. Fyra stycken sensorer placeras på gräsklipparens kaross. Dessakommunicera med en mikrokontroller som i sin tur förmedlar mätdata till en dator. På datorn körsen sökalgoritm som tolkar och sammanfogar sensorernas mätdata.Efter ett antal tester visar det sig att de sensorer som valts inte uppfyller de krav som ställts. Dockbör den metod och algoritm som används kunna uppfylla kraven om en annan typ av sensor används.AbstractThis master thesis is aiming to investigate the possibility of adding distance sensors to Husqvarna’sautonomic lawnmower. The goal is to prevent the lawnmower from colliding with obstacles in itssurroundings. The environment where the lawnmower is working is very dynamic in sense ofweather, temperature, ambient lightning and terrain. This gives high requirements on the sensors.Of all the sensors that were examined, ultrasonic and structured lightning came out as the ones bestfit to fill these requirements to a reasonable cost.In this thesis ultrasonic sensors from Maxbotix were implemented on a prototype. Four sensors wereplaced on the lawnmower body and connected to a microcontroller. The microcontroller then passesalong the sensor data to a computer that is running a search algorithm. The algorithm is used tointerpret the data and merge the different measurements.After certain amount of testing it was shown that the chosen sensor did not meet all therequirements. However the method and the chosen algorithm should suffice with another type ofsensor.
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Kopec, David, and Kai Umeda. "Mowing Turfgrasses in the Desert." College of Agriculture, University of Arizona (Tucson, AZ), 2015. http://hdl.handle.net/10150/579500.
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Alhaj, Kasem Mustafa, and Daniel Andersson. "Locating faults in boundary wires for autonomous lawn mowers : An investigative study on methods used to locate faults in underground, low-voltage cables with focus on implementing Time Domain Reflectometer (TDR)." Thesis, Jönköping University, JTH, Avdelningen för datateknik och informatik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-54150.
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Purpose:The purpose of this thesis was to identify a useful solution to find the location of a broken boundary wire. By useful we mean that the solution should be inexpensive, user friendly and accurate. However, this thesis will only investigate the accuracy of the method where the hypothesis is that an investigated method is applicable for all underground wires. Method:This study conducted a literature research in order to investigate what methods that are used in other industries to locate faults in underground, low-voltage electrical wires. After the research, the most commonly used fault locating methods were described and the one that seemed most useful was chosen as a possible solution.For the solution to be useful the accuracy was investigated. The method used to conduct an experiment and gather data to validate the solution was Design Science Research. Result:Three methods were investigated as possible solutions:Time Domain Reflectometry (TDR), Frequency Domain Reflectometry (FDR) and Murray bridge where experiments were conducted using TDR.TDR proved to be unapplicable in locating faults in boundary wires, although it was confirmed to be a valid solution to locate faults in coaxial cables with <1% error margin.What makes TDR and other reflectometry methods unsuitable methods within the autonomous lawn mower industry is the lack of characteristic impedance in the used boundary wires. The hypothesis that an investigated method is applicable for all underground wires is thereby refuted. Limitations:Experiments were conducted in laboratory environment with a signal generator and an oscilloscope. One experiment was conducted on a boundary wire in the ground which provided no reflected signal.
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Damineni, Sarath Chandra, and Sai Manikanta Munukoti. "Product Usage Data collection and Analysis in Lawn-mowers." Thesis, Blekinge Tekniska Högskola, Institutionen för datavetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-20658.
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Background: As the requirements for the modern-day comforts are raising from day to day, the great evolution in the field of lawn-mowers is recorded. This evolution made companies produce a fleet of lawn-mowers(commercial, house-hold) for different kinds of usages. Despite the great evolution and market in this field, to the best of our knowledge, no effort was made to understand customer usage by analysis of real-time usage of lawn-mowers. This research made an attempt to analyse the real-time usage of lawn-mowers using techniques like machine learning. Objectives: The main objective of the thesis work is to understand customer usage of lawn-mowers by analysing the real-time usage data using machine learning algorithms. To achieve this, we first review several studies to identify what are the different ways(scenarios) and how to understand customer usage from those scenarios. After discussing these scenarios with the stakeholders at the company, we evaluated a suitable scenario in the case of lawn-mowers. Finally, we achieved the primary objective by clustering the usage of lawn-mowers by analysing the real-world time-series data from the Controller Area Network(CAN) bus based on the driving patterns. Methods: A Systematic literature review(SLR) is performed to identify the different ways to understand customer usage by analysing the usage data using machine learning algorithms and SLR is also performed to gain detailed knowledge about different machine learning algorithms to apply to the real-world data. Finally, an experiment is performed to apply the machine learning algorithms on the CAN bus time-series data to evaluate the usage of lawn-mowers into various clusters and the experiment also involves the comparison and selection of different machine learning algorithms applied to the data. Results: As a result of SLR, we achieved different scenarios to understand customer behaviours by analysing the usage data. After formulating the best suitable scenario for lawn-mowers, SLR also suggested the best suitable machine learning algorithms to be applied to the data for the scenario. Upon applying the machine learning algorithms after making necessary pre-processing steps, we achieved the clusters of usage of lawn-mowers for every driving pattern selected. We also achieved the clusters for different features of driving patterns that indicate the various characteristics like a change of intensity in the usage, rate of change in the usage, etc. Conclusions: This study identified customer behaviours based on their usage data by clustering the usage data. Moreover, clustering the CAN bus time-series data from lawn-mowers gave fresh insights to study human behaviours and interaction with the lawn-mowers. The formulated clusters have a great scope to classify and develop the individual strategy for each cluster formulated. Further, clusters can also be useful for identifying the outlying behaviour of users and/or individual components.
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Mehdijev, Shamil, and Robert Lundberg. "Path planning and coordination of multiple autonomous lawn mowers." Thesis, KTH, Skolan för elektro- och systemteknik (EES), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-200531.
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Picmaus, Jan. "Akumulátorová sekačka na trávu." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2021. http://www.nusl.cz/ntk/nusl-442784.
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The thesis deals with a concept of turning a conventional petrol powered lawn mower to a battery powered solution which is powered by lithium cells. A division to three chapters, comparison, mechanical and electrical, provides fluency of the whole design and further realization. The arrangement of chapters is performed so that the continuity of the thesis is maintained. Calculations of parameters of every motor and transmission with choosing particular devices are just a part of much interesting information which can be found in this thesis. All new components have full documentation except those which were changed during manufacturing. The electrical part explains every part of the schematics in detail. The realization contains difference between preliminary design and further production, manufacturing of the PCB and powering up the motor drives. The last part of the thesis contains temperature measurements of the device at no load.
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Johansson, Gustav, and Duberg Johan Vogt. "Economic Potential for Remanufacturing of Robotic Lawn Mowers with an Existent Forward Supply Chain : A case study on Husqvarna." Thesis, Linköpings universitet, Produktionsekonomi, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-157620.
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This project investigates how remanufacturing of robotic lawn mowers can be incorporated into an existent forward supply chain. The project is conducted as a single case study on Husqvarna where an interview study and a literature study provide the empirical data and theory, respectively. Alternatives are proposed for potential remanufacturing cases at various locations, where different parties ranging from original equipment manufacturers to independent manufacturers perform the remanufacturing process. SWOT analyses are conducted to identify the most promising alternatives for a further economic analysis. The economic evaluation is based on net present values and a sensitivity analysis which together determines the feasibility of the alternatives. The results of the project answer three research questions. The first concludes that out of seven defined production systems there are only two that are not suitable for remanufacturing in a general case mainly due to the low flexibility of these systems. The results of the second identifies labor, logistics, and operational prerequisite factors that must be considered when implementing remanufacturing for case specific alternatives. The conclusion of the third research question lists the feasibility of the alternatives from which the recommendations for Husqvarna are presented. This project recommends Husqvarna to implement a remanufacturing process for their robotic lawn mowers either by enlisting their current dealers or by themselves at a location nearby the spare parts warehouse in Torsvik. Which alternative is the most profitable depends mainly on the expected quantity of the acquired cores, i.e. Husqvarna as a centralized remanufacturer benefits more from higher quantities while the decentralized dealer alternative would comparably be more profitable if the quantities were lower. As it is perceived that initial collected quantities will be low, and possibly even somewhat higher for the dealers, a decentralized remanufacturing process could be the most profitable alternative to start with. Using a third-party remanufacturer is also feasible but considered risky and therefore not recommended as they could have the same core acquisition problem as Husqvarna while having lower profitability.
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Östlund, Norea. "Bulvanregeln eller skatteflyktslagen? : Analys av genomförandet av moder-/dotterbolagsdirektivets antimissbruksbestämmelse i svensk rätt." Thesis, Uppsala universitet, Juridiska institutionen, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-445082.
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Akladios, Magdy. "Safety by design-- an expert systems approach /." Morgantown, W. Va. : [West Virginia University Libraries], 1999. http://etd.wvu.edu/templates/showETD.cfm?recnum=1033.
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Thesis (Ph. D.)--West Virginia University, 1999.Title from document title page. Document formatted into pages; contains xi, 238 p. : ill. (some col.) Includes abstract. Includes bibliographical references (p. 231-238).
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Svedberg, Axel. "Genomförande av moder-/dotterbolagsdirektivets antimissbruksklausul i svensk rätt : Specifikt med avseende på utgående utdelningar." Thesis, Uppsala universitet, Juridiska institutionen, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-325280.
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Ping-HsienChiang and 江炳賢. "Autonomous Lawn-mower Robot." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/98937469321244918945.
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碩士國立成功大學
工程科學系碩博士班
101
The goal of this thesis is to develop an autonomous lawn-mower robot. The core device of the robot is a Microchip PIC 4520 chip for controlling the robot moving, blade motor, collision sensors, and ultrasonic sensors’ signal processing. Mowing robot is used to save a lot of manpower and time consuming for mowing a lawn. The driving capability of robot walking on the grass is considered. The usage of ultrasonic sensors’ positioning communication for avoiding various obstacles in the lawn and achieving maximum coverage of mowing is also included in the design of the mowing robot. Furthermore, the spiral boustrophedon used as the global coverage path planning is also implanted in the design of the mowing robot.
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Kung, Tai-Wen, and 龔泰文. "Development of Unmanned Electrical Lawn Mower." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/29009244902068395132.
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碩士國立宜蘭大學
生物機電工程學系碩士班
101
The objective of this research is to develop a simple unmanned electrical lawn mower to solve the problems of noise and pollution caused by the traditional lawn mower. The unmanned electrical lawn mower is composed of an autonomous four-wheel mobile robot and a grass mowing machine. The lawn mower is equipped with four ultrasonic sensors to detect the surrounding distance and an electrical compass to tell the orientation of the robot. The detected obstacles can be categorized to real and virtual type. The real obstacles can further be categorized to wall obstacles and small real obstacles. The lawn mower can detour the small real obstacles, but it can’t detour the wall. The lawn mower not only use the reciprocal path to mowing grass, but also can successfully detour the small real obstacles arrive at destination. The developed lawn mower provides the possibility to autonomously mow a working space which needs to be segmented by the real walls and virtual walls in advance. In addition, a laser range finder was used to calculate the coverage area in order to achieve higher coverage rate and lower overlap rate. The indoor experiment result showed that the success rate can reach up to 80%, and the coverage rate was more than 80%. The outdoor experiment result showed that the success rate can reach up to 70%, and the coverage rate was more than 75%. After second time of mowing at the different direction, the outdoor experiment overage rate can be enhanced to more than 80%.
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Vance, John. "Design of a three-spindle mulching lawn mower." 1996. http://catalog.hathitrust.org/api/volumes/oclc/36270116.html.
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Thesis (M.S.)--University of Wisconsin--Madison, 1996.Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaf 69).
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Lin, Keng-Chih, and 林耕志. "Study of Intelligent Energy-Saving Automatic Lawn Mower Robot." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/94167950526586021201.
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碩士國立勤益科技大學
電子工程系
98
This thesis aims to develop an intelligent automatic energy-saving lawn mowing robot. The guidance and control system which was combined the electronic compass TCM2 and a single chip microcontroller SPCE061A performs the path plan of robot. One can achieve the avoidance obstacles and saving energy control functions by the ultrasonic wave sensors in order to drive and control the DC motor and calculate the path schedule via additional optical breaker control circuit. In where the electronic compass is used to detect the direction of magnetic field. However, in this thesis the electronic compass provided the coordination of one small magnetic field interference and was a key in order to ensure the accuracy of navigation and guidance of the robot to plan a right direction. Ultrasonic wave sensor system was used to sense obstacles to avoid the robot’s collision. The robot planed out the best path and controlled mowing output functions by the switching output method in order to achieve the purpose of mowing. Through the experimental results, the developed control algorithms are efficient. In straight guidance and control test, the position error is within 5cm, and the azimuth angle error is within 2 °. During the guidance and control and obstacles avoidance, the position accuracy is within 6 cm, and the heading angle error is less than 5 °. Then the mowing robot can achieve the guidance and control to plan the best route to reach the autonomous efficiency of automatic mowing and energy saving.
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Wang, Kai-Sheng, and 王凱陞. "Design and Implement of an Intelligent Robotic Lawn Mower." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/e3dq2c.
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碩士國立臺灣大學
生物產業機電工程學研究所
107
This study is dedicated to establish an intelligent lawn mower. Based on a remote control car body and calculate the motion state of the mower body based on the characteristics of Ackermann steering system. The corresponding mower body speed and angular velocity relationship are implemented and maintained by the Robot Operating System (ROS). The Hall sensor is used to test the tire’s rotation speed to perform linear speed sensing. The measured speed from Hall sensor and the actual measured average speed deviation are 0.7 m/s, and sensor fusion is implemented by Kalman Filter, so as to achieve more accurate mower state tracking, since the steering is only using the IMU for sensing, error gradually increase overtime, so it is necessary to additionally locate the position of the mower through environmental information. Through the depth information of the Intel D435 depth camera, as the main sensor of the intelligent mower''s environmental information, with the mower state estimated by Kalman Filter, using the Particle Filter algorithm to locate the mower position, confirm the mower After state tracking and positioning, the overall environment can be mapped with environmental information to achieve Simultaneous Localization And Mapping (SLAM). In this study, the path planning is divided into global and local path planning, implement by the combination of the shortest path algorithm (A* search) and DWA (Dynamic window approach). Achieve the basic positional movement effect、remote control and analog monitoring functions. In the field of region filling, tests how to completely fill an irregular shape map through simulation. In addition to the above software implementation, this study also includes how to gradually build a remote control car into a self-driving vehicle with a mowing mechanism, and design a mowing mechanism’s prototype, and test the mowing with a current sensor. The current feedback tracking of the drive motor is used to monitor the mowing situation.
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Chen, Hsing-Yu, and 陳星佑. "Control Design of Lawn Mower Robot Based on RTK-GPS." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/7g4vq2.
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碩士國立雲林科技大學
資訊工程系
107
At present, automatic sweeping robots are very common in the market, but automatic mowing robots are not so common. The automation of lawn mowers can eliminate many boring manual work and save labor. The focus of this article is to develop a fully automatic mowing robot. The mowing robot can be set to automatically cut off weeds in the designated area, or it can be manually controlled by wifi using a mobile phone, allowing the user to remotely control the mowing robot. We first bought a mower to modify it and completed the manual control. After that, we assembled a small robot car to simulate the automation part for the convenience of testing. The automated part uses the RTK method to get the precise GPS coordinates of the current car and the next target, and then combines the gyro sensor plus the PID to complete the straight line to reduce the overlap ratio during walking.
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Hsu, Ping-Min, and 徐秉民. "Design of an Autonomous Lawn Mower with Optimal Route Planning." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/64464796589990958912.
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碩士國立中興大學
電機工程學系所
96
An optimal path planning scheme for autonomous lawnmowers to achieve minimum working time, minimum energy conservation and mixed operation mode, as well as high efficiency is developed in this thesis. For route planning, rough path planning and a geography method are adopted. A rough path planning is first considered with obstacles ignored. Then, a geography method is applied to enable the details of a real optimal path in accessing the easiest and safest condition. After taking the chosen mode, a distinct path planed on the basis of the obstacles coordinates are obtained. Additionally, a global positioning system (GPS) which provides real-time positioning of the lawnmower is equipped with the path planning system. In addition to the path planning using single mower, an algorithm for multi-task operation as well as the partitioning method for working area is also developed. For this algorithm, we define an index of mowing easiness, with which the accomplishing level in mowing for any prairies can be derived. Based on the figure of mowing easiness, an objective function is proposed for optimization. With the optimization of this objective function, the control law for the optimal multi-task of mowing is developed. The optimal path planning has been tested under a variety of simulations and proven to be effective in enhancing the working efficiency.
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Chen, Jian-Hua, and 陳建樺. "Design and Implementation of Electrical Lawn Mower Drive Control with Embedded Vision System." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/12978041477394959991.
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STAVÁREK, Tomáš. "Analýza faktorů ovlivňujících údržbu travnatých ploch." Master's thesis, 2018. http://www.nusl.cz/ntk/nusl-376034.
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The diploma thesis based on the Analysis of factors influencing maintenance of lawns deals with maintenance of lawns, mowing machines used during maintenance, overview of factors that affect the performance and consumption of mowers in maintenance of lawns. In order to evaluate the efficiency of the mowers, the effects of selected factors were assessed, namely the size and shape of the plot, the character of the stand, the height of the mowing, the slope of the land and the influence of the mower operator.