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Dissertations / Theses on the topic 'Balancing of engine'

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Published: 4 June 2021
Last updated: 17 February 2022

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1

Mäkeläinen, M. (Marko). "Algorithms for opportunistic load balancing cognitive engine." Master's thesis, University of Oulu, 2013. http://urn.fi/URN:NBN:fi:oulu-201303011071.

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Due to the increasing use of more and more powerful smart devices demands on the scarce radio spectrum are becoming more intense. One way to cope with increasing demands on radio spectrum is to apply innovative and flexible authorization schemes like spectrum sharing. Under the spectrum sharing paradigm, multiple users and/or systems are authorized to utilize the same spectrum band in a defined sharing agreement. A technology that is generally recommended for the implementation of spectrum sharing is called cognitive radio (CR). In this thesis, we design and implement a cognitive engine (CE) that intelligently and dynamically allocates spectrum resources to users. We first consider a scenario where a network has an exclusive access to a spectrum band and the CE accepts or rejects the arrival user requests based on an algorithm that takes into account a user’s priority and its bandwidth demand. We then consider a spectrum sharing scenario where along with the exclusive utilization to its own spectrum band a network also can opportunistically utilize another network’s spectrum band. For this scenario, we design and implement a CE that performs two main tasks: 1) Accepts or rejects arrival user requests based on a priority based algorithm; and 2) it intelligently load balances the user traffic between the two available network resources, while taking into account the primary user activity in the shared spectrum band. We provide a load balancing algorithm and evaluate its performance under different primary and secondary user traffic scenarios. We show that the proposed load balancing algorithm increases average throughput of the network and it also reduces the average number of users rejected by the network
Yhä tehokkaampien älykkäiden langattomien päätelaitteiden nopea lisääntyminen johtaa niukan radiospektrin yhä kiihtyvään käyttöön. Eräs menetelmä radiospektrin lisääntyvän kysynnän tyydyttämiseen on hyödyntää innovatiivista ja joustavaa resurssin käytönjakoa kuten spektrin jakamista. Spektrinjakamismalli mahdollistaa useiden käyttäjien ja/tai järjestelmien yhtäaikaisen käytön samalla taajuuskaistalla hyödyntämällä sovittua käytäntöä resurssien jakamisesta. Radiospektrin jakaminen on tänä päivänä yleisesti suositeltu toteuttamaan hyödyntämällä kognitiivista radioteknologiaa. Tässä työssä suunnittellaan ja toteutetaan kognitiivinen päätöksentekokone, joka jakaa radiospektriresursseja käyttäjille älykkäästi ja dynaamisesti. Kognitiivista päätöksentekokonetta radioresurssien jakamisessa hyödynnetään kahdessa skenaariossa. Ensimmäisessä skenaariossa radioverkolla on yksinomainen pääsy taajuuskaistalle, jonka käyttöä kognitiivinen päätöksentekokone säätelee joko hyväksymällä tai hylkäämällä verkkoon liittyviä käyttäjiä. Kognitiivinen päätöksentekokoneen päätökset perustuu algoritmiin, joka ottaa huomioon käyttäjien määritetyn tärkeyden ja käyttäjän vaatiman kaistanleveyden. Seuraavassa skenaariossa radioverkko voi oman yksinomaisen taajuuskaistan lisäksi hyödyntää opportunisesti toisen radioverkon taajuuskaistaa silloin, kun siellä ei ole liikennettä. Tätä skenaariota varten suunnitteltiin kognitiivinen päätöksentekokone, jolla on kaksi päätehtävää: 1) hyväksyä tai hylätä verkkoon liittyviä käyttäjiä edellämainitun tärkeysperusteisen algoritmin avulla; ja 2) jakaa käyttäjien liikennettä kahden tarjolla olevan verkon välillä samalla ottaen huomioon opportunistisen resurssin pääkäyttäjien liikenteen jaetulla taajuuskaistalla. Tässä työssä esitellään toteutettu kuormantasausalgoritmi, jonka suorituskykyä tarkastellaan erilaisissa pääkäyttäjien ja toissijaisien käyttäjien liikenneskenaarioissa. Simulaatiotulokset osoittavat, että esitellyn kuormanjakoalgoritmin hyödyntäminen kognitiivisessa päätöksentekokoneessa parantaa verkon keskimääräistä siirtonopeutta, sekä vähentää keskimääräistä käyttäjien hylkäysastetta verkossa. Algoritmimme parantaa opportunistisen taajuuskaistan käyttöastetta. Algoritmimme ottaa myös huomioon käyttäjille asetetut prioriteetit ja parantaa korkeampi prioriteettisten käyttäjien asemaa verkossa. Tämä tulee ilmi muun muassa korkeampi prioriteettisten käyttäjien pienemmässä hylkäysasteessa
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2

Hillerborg, Per. "Dynamic Model of a Diesel Engine for Diagnosis and Balancing." Thesis, KTH, Reglerteknik, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-107535.

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To monitor and control the combustion in a diesel engine one can study the speed signal from the flywheel. The idea is that if individual cylinders give different amount of torque this will lead to variations in the flywheel speed. A model which describes the cylinder torque based on flywheel speed can be used to estimate the torque from individual cylinders. With this new knowledge of the individual performance of each cylinder the engine can be balanced. The balancing aim at making the speed of the flywheel more even but also required a model with estimated cylinder torque as input. This model may also be used for testing new control algorithms easily and gaining understanding of the dynamics. In this thesis a time dissolved model is constructed to describe the cylinder pressure-, crankshaft-, flywheel and damper dynamics. The model is based on a physical point of view by approximating the system into nodes containing mass, stiffness and friction. The inputs into the model are injection data from the engine management system (EMS) and a torque from a drive line. Ways to reduce the complexity of the model are investigated in order to invert the model to estimate the injection data based on flywheel speed measurements. Measurementsare done in a test bed to receive data required for model simulation and validation. The result is that the main behavior of the dynamics is caught. The self oscillation behaviors in some operating points are however not caught which indicates that the model can not explain all behaviors. A reduced model works almost as well but of course looses more of the non stiffness behavior. As expected, the model equations can not be solved in real time. The result of the inverted reduced model depends on the flywheel signal. When the signal contains little non stiffness behavior the result is good. An observer model based on the reduced model is suggested and tested in order to estimate the indicated torque from flywheel data. The observer manages to detect errors in the injection.
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3

Vaško, Roman. "Možnosti vyvážení dvouválcového motoru pro traktorové použiti." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231704.

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This thesis deals with possibilities of 2-cylinder engine balancing for tractor usage. The purpose of this thesis is to find a technical solution for the creation of the concept of balancing using balancing shaft. Check the proposed solution by FEM analysis and evaluate the fatigue safety. The content of the thesis is the creation of computational and graphical documentation too.
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4

Svoboda, Radim. "Kontrola vyvážení klikového mechanismu maloobjemového traktorového motoru." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-231005.

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The purpose of this thesis is determinate the forces in crankshaft mechanism acting on new design engine from company Zetor, assessment of the state of balance, design modifications balancing units, calculation of modal analysis, stress analysis and strain control. The content of the work is the creation of technical documentation for the newly modified balancer shafts.
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5

Fáber, Filip. "Zážehový motor pro malá osobní vozidla." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-230346.

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The aim of this master’s thesis was to define force progression in crank-type mechanism from the set parameters of the cylindrical unit. Furthermore, the design of the possible balance of this crank-type mechanism with one balancing shaft was realized. The calculations of torsional vibration and stress analyses of the designed crank-type mechanism were realized too.
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6

Briš, Tomáš. "Tříválcový vznětový motor pro užitková vozidla." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-318523.

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The diploma thesis deals with a design of a crankshaft for a three-cylinder diesel engine for commercial vehicles. The engine is a member of a unified line of engines with the number of cylinders from two to six. The main points of the work are a draft of the crankshaft configuration, the balance of inertial forces and the moments in the crank mechanism, creation of drawings of the crankshaft and finally carrying out a strength analysis of the part, taking into account torsional vibration. The aim is formation of a part – crankshaft for potential usage in the automotive industry.
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7

Ošmera, Petr. "Hnací ústrojí osmiválcového leteckého motoru." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-227899.

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Configuration of the powertrain of a flat-eight engine with ordered basic parameters is the theme of this thesis which name is Powertrain design of an eight-cylinder aircraft engine. This thesis occupies with configuration design of the crank mechanism and firing order, balancing of centrifugal and reciprocating forces and their moments, conceptual design of crankshaft and its stress calculation. This thesis also puts mind to calculation of torsional vibrations.
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8

Kopřiva, Martin. "Hnací ústrojí desetiválcového leteckého motoru." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-228009.

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Configuration of the powertrain of a flat-engine with ordered basic parameters is the theme of this final thesis which name is Powertrain design of ten-cylinder aircraft engine. This thesis is occupied with configuration design of the crank mechanism and firing order, balancing of centrifugal and reciprocating forces thein moments, conceptual design crankshaft and its stress calculation of torsional vibrations.
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9

Munzenmay, Micha. "Implementation of engine cycle simulation in the function development for modern electronic diesel control and its application on adaptive balancing control." Thesis, Glasgow Caledonian University, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.688255.

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10

Josefíková, Kateřina. "Návrh klikového mechanismu leteckého vznětového motoru." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-229179.

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The purpose of this thesis is design of a crank mechanism for diesel aircraft engine. Next then appropriately balance crank mechanism, strength tests and calculation of crankshaft torsional vibration. Developing of drawings documentation of crankshaft.
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11

Jurík, Juraj. "Torzní kmitání tříválcového motoru s vyvažovací hřídelí." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-318532.

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Content of this master thesis is analysis of torsional vibration of the three cylinder engine with balancing shaft. In theoretical part of the thesis the kinematic and dynamic description of the cranktrain mechanism is included. The formation of unbalancing of the engine and methods of balancing are described in the theoretical part as well. In practical part of the thesis the analytical calculation of torsional vibration is provided. Simulation of the engine model in multibody software Adams/Engine was used as the other way of torsional vibration analysis. In the result part of the thesis the comparison of the both way of analysis were discussed. Last step of the thesis was design proposal of the torsional vibration damper done by the analytical calculation.
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12

Příborský, Vladimír. "Hnací ústrojí čtyřválcového leteckého motoru." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-228016.

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This thesis named Powertrain of an four-cylinder aircraft engine dealing with configuration of the powertrain of a flat four-cylinder engine with ordered basic parameters. The thesis is focused on configuration design of the crank machanism and sequence ignition, balancing of centrifugal and reciprocating forces and their moment, conceptual design of crankshaft and its stress calculation. The thesis describing calculation of torsional vibration as well.
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13

Domský, Viktor. "Tříválcový řadový vznětový motor s excentrickým klikovým mechanismem pro užitková vozidla." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-232051.

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The goal is to investigate the influence of eccentricity on the force between the piston and the cylinder liner and the influence on balancing of the crank mechanism. For a selected eccentricity suggest a balancing method and perform stress analysis of crankshaft considering torsional vibration. Eccentricity is chosen by the ratio of centric and eccentric mechanism of friction work. The paper shows the effect of eccentricity on the selected kinematics values. Stress analysis is done in the software ANSYS. Using selected eccentricity the friction work was reduced by 10 %.
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14

Břečka, Marek. "Zážehový tříválcový hvězdicový letecký motor." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-399281.

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The purpose of this thesis is to design a powertrain of petrol three-cylinder radial aircraft engine with the main parameters specified (bore, stroke, etc.), balancing inertia forces, stress analysis and determining of fatigue of the selected parts.
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15

Donutil, Jan. "Zážehový pětiválcový hvězdicový letecký motor." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-399287.

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This thesis deals with configuration of radial five-cylinder engine with attention to crank mechanism. Covered topics are motion of crank mechanism with articulated connecting rod, force analysis and balancing of inertial forces. The second part discusses FEM analysis and calculation of safety factor of selected component.
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16

Vítek, David. "Hnací ústrojí pětiválcového zážehového hvězdicového motoru." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230485.

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This Diploma thesis deals with a design of a powertrain of fice-cylinder gasoline radial engine with assigned main parameters (bore, stroke, etc.). The work is divided into several parts: kinematics of the radial engine, creation of 3D models, force acting on the connecting rods, balancing of the engine. The last part is focused on creating MKP models, stress analysis and determining of fatigue safety of the selected parts.
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Freisleben, Pavel. "Dvouválcový zážehový motor s excentrickým klikovým mechanismem pro osobní vozidla." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-232115.

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This thesis deals with forces of the crank mechanism. The aim of this work is to find the right value of the eccentricity of the crank mechanism, which will have a positive effect on the size and course of forces that cause friction losses in the crank mechanism. Next solves this balancing eccentric unit. The last part deals with the design and strength check of the crankshaft considering torsional vibration.
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Kalugin, Ivan. "Letecký motor." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229648.

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This thesis is focused to design piston rods for aircraft petrol six-cylinder engine with 102 kW output power and project their form. Other part deals with analysis of balancing of arranging and fort control one of piston rod.
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Domínguez, Sal David. "Analysis and optimization of question answering systems." Doctoral thesis, Universitat Politècnica de Catalunya, 2010. http://hdl.handle.net/10803/78011.

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20

Tvrdík, Tomáš. "Přestavba víceválcového motoru na experimentální motor." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-230121.

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This thesis refers to reconstruction of the serial tractor four-cylinder engine to one-cylinder experimental engine. The thesis includes a calculation and proposal of balancing unit. The other part of the thesis contains FEM calculation. In the conclusion there are evaluation of proposal and financial valuation of the engine production.
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Bolcek, Adam. "Dvouválcový motocyklový motor." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231730.

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The main aim of this master’s thesis is balancing of the inertia forces of sliding parts of the twin cylinder motorcycle’s engine by dummy connecting rod. There is description of two computing stances to design dummy connecting rod. Then there is comparison of these computing stances. The dummy connecting rod is designed and the strength analysis is done by FEM method (finite element method) to limit the state of material fatigue. Furthermore, a crankshaft is designed while considering rotation parts’ inertia forces balancing. Finally, a strength analysis by FEM method is done to limit state of material fatigue of the crankshaft
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Černohous, Tomáš. "Dvouválcový řadový vznětový motor s excentrickým klikovým mechanismem pro užitková vozidla." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-232050.

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The goal of this master’s thesis is to examine the influence of eccentricity on the behaviour of forces between the piston and cylinder liner and on balancing of the crank mechanism for given parameters of the diesel engine. Another aim of this paper is to propose an appropriate balancing of the crank mechanism followed by stress analysis considering torsional vibration for a chosen value of eccentricity.
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23

Horváth, Tomáš. "Zážehový sedmiválcový hvězdicový letecký motor." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-399358.

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The aim of this diploma thesis is to propose a drive train of a seven-cylinder radial engine, including strength analysis of selected components. The basic parameters of the engine cylinder are based on the Škoda 1.2 HTP 12V 47kW AZQ engine.
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Svoboda, Radovan. "Konstrukce experimentálního jednoválcového motoru s plovoucí vložkou." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230480.

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The aim of this master`s thesis was to design a single-cylinder test engine for measuring of the friction forces between the piston group and the cylinder liner. Main engine parameters are based on the common production engine. A floating liner device was chosen for a friction forces measurement. It was necessary to solve an attachment and sealing of the floating liner. Stress-strain analysis of the floating liner has been done. Next step was to re-design a production crankshaft also with a connected balancing devices for single-cylinder engine. Powertrain was seated in a completely new units. Finally the engine was completed and mounted on a stand.
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Rejnuš, Miroslav. "Modifikace tříválcového vznětového motoru na zkušební jednoválec." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-449787.

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The master thesis deals with the design of a single-cylinder diesel piston internal combustion test engine by modifying the initial mass-produced three-cylinder engine. The first part of the thesis is devoted to the introduction to the problems of diesel and experimental single cylinder engines. Subsequent chapters focus on the adaptation of the baseline engine itself, including balancing of inertial forces. Furthermore, the crankshaft operability is checked, including the determination of safety against high-cycle fatigue. The last chapter deals with the design of the connection of the adapted unit to the dynamometer.
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Ducheček, Martin. "Čtyřválcový řadový vznětový motor s excentrickým klikovým mechanismem pro užitková vozidla." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-232116.

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The purpose of this thesis is to evaluate the influence of eccentricity of crank mechanism to the force between the piston and the cylinder liner for appointed crank mechanism. Furthermore the influence of eccentricity to balancing crankshaft is verified and for selected value of eccentricity is realized balance. For the construction check was realized stress analysis of crank mechanism included torsion vibration.
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Pecka, Luboš. "Hnací ústrojí čtyřválcového vidlicového motoru." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-229282.

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This thesis is focused to design of powertrain V-four gasoline engine. It compares crank-pins configuration, firing sequence and bank angle with a view of crankshaft stress and torsional vibration. The thesis also includes crankshaft balancing design.
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Procházka, Miloslav. "Pětiválcový řadový vznětový motor s viskózním tlumičem." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-230246.

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The aim of this diploma work is to design moving parts of the five cylinder inline diesel engine with given parameters, then to balance centrifugal forces and moments and design viscous torsional vibrations damper and calculate forced oscilations without the damper as well as with the damper. The designed parts are put to stress analyse by finite elements method. My design is based on similar construction of four cylinder engine Zetor.
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Neklapil, Libor. "Návrh souosého vysokootáčkového reduktoru." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-228136.

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The thesis deal with design of coaxial high-speed gear box for small-scale turboshaft engines. At the beginning a study of problems was performed and for design concept was elected version of single-shaft turbo-engine with electric generator. Kinematic diagram, type of gear design, material and lubrication method was designed. Further was solved proposal of basic gearing parameters, choice of the number of tooth and basic proposal calculations were performed. Was performed check calculation of gearing, calculation of bearings durability and was processed design documentation in required range. Designed gear reducer has two stage with three coutershafts, that are deployed evenly about main axis of reducer. First stage is gear with external gearing, second stage with internal gearing. The thesis may be used as a template for next similar gear reducers design.
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Navrátil, Zdeněk. "Pětiválcový řadový vznětový motor s vyvažovací jednotkou." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229671.

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his diploma work themed: Five-cylinder in-line Diesel engine with balancing unit is dealing with analysis of balancing possible alternatives of arranging crankshaft, analysis of arranging counterweight, concept of balancing shaft, engineering design of crank-shaft, calculation of frequency, computational control of crank-shaft in light of torsional oscillations and proposal of dynamic pendulum damper.
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Steigl, Vladimír. "Čtyřválcový zážehový motor s vypínáním válců." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-318839.

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The aim of this diploma thesis is design of configuration and balancing of crankshaft which is determined for four-cylinder gasoline engine. The thesis investigates kinematics, dynamics and possible ways of balancing the inertial forces and moments of the rotating and sliding parts of the central crank mechanism. Subsequently, the 3D CAD model is designed according to the presented drawing. It is transformed into a spare torsion system, from which the calculations of its own and forced torsional vibrations are based. The proposed 3D CAD model is then spatially transmitted in the FEA software Ansys Workbench and modified (boundary conditions, etc.) in the FEA software Ansys Mechanical APDL so that it can be calculated according to the selected LSA method. From the selected results of the LSA method, the crankshaft safety factor against fatigue damage is calculated.
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Parchański, Martin. "Pětiválcový řadový vznětový motor." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-229101.

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The purpose of this thesis is design of in-line a five-cylinder diesel engine arrangement with given main parameters, power train design, balancing centrifugal and inertia moments and calculation of torsion vibrations. The proposed engine must be based on four-cylinder diesel Zetor engine.
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Süttő, Daniel. "Pětiválcový řadový vznětový motor s excentrickým klikovým mechanismem." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231456.

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The aim of this thesis is to find out the influence of eccentricity of crank mechanism on the duration of the force between the piston and the cylinder liner. At the same time I wanted to find out its influence on the balance of the whole system. It is important to design the balance for the selected value of the eccentricity and subsequently put through the crank shaft to stress analysis with torsional vibrations. I got so interested in this problem that in addition to the whole topic I designed a torsional vibration damper.
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34

Nikolaychuk, Yaroslav. "Čtyřválcový vznětový motor pro užitková vozidla." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-377457.

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The diploma thesis focuses on the design of the crankshaft for a four-cylinder diesel engine for commercial vehicles, the main task of this work are the design configuration of the crankshaft balance inertia forces and torques at the crank mechanism, drawing documentation crankshaft design strength check considering torsional vibration.
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35

Švarc, Marek. "Pětiválcový vznětový motor pro užitková vozidla." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-318711.

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The aim of this diploma thesis is the design of the configuration and the method of balancing the crank mechanism with the specified parameters. For a particular configuration, a crankshaft drawing is processed and a strength analysis, considering the crankshaft torsional vibrations is performed in Ansys FEM software. At the end of the thesis, an ideological design of the torsional vibration damper and its effect on the crankshaft stress in the Ansys FEM software is performed.
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36

Swords, Edward. "Virtual bass synthesis and balancing bass in pop music." Thesis, Luleå tekniska universitet, Institutionen för konst, kommunikation och lärande, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-74121.

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A bass enhancement technique using the missing fundamental called VBS is presented. There are Several different approaches for using VBS in different applications. The technique is most useful in speakers that has a poor low frequency capability. It is presented in this report how it can be used for mixing purposes. How can a mix engineer use this technique to get a more balanced mix in laptop speakers without sacrificing the balance in large loudspeakers and headphones? To investigate this question an A/B style listening test is conducted, where the subjects get to answer both quantitative and qualitative questions. The answers are then analyzed using simple t-tests and categorizations of the qualitative information. The results of the test indicate that the mix with VBS is preferred in both the headphones and the laptop. There are no information indicating that the VBS has affected the mix in a poor or good way in the Loudspeakers.
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37

Pulava, Oleksandr. "Šestiválcový vznětový motor pro užitková vozidla." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-378397.

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The aim of this diploma is to design a crankshaft for a six-cylinder commercial vehicle, which is one of the unified motors. The main parts are the design of the crankshaft configuration, the crankshaft balancing method for forces and moments, the crankshaft design documentation, and the crankshaft strength verification. The design of torsional vibration damping characteristics is also made and its effect on torsional vibration and crankshaft strength is determined.
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38

Lucas, Anna. "A grounded theory of the balancing act South Asian mothers engage in to negotiate a healthy family lifestyle." Thesis, London Metropolitan University, 2014. http://repository.londonmet.ac.uk/947/.

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Introduction Overall the evidence is consistent and robust that UK South Asian communities are at elevated risk of lifestyle related disease. A potential worsening of obesity related risk in South Asian children carries implications for persisting disparities in chronic disease across generations making it advantageous to target this specific group for obesity prevention. Psychosocial factors are particularly important in obesity and key to understanding the determinants of dietary and physical activity behaviour, and factors that might influence behaviour modification in South Asians. The study aims to identify beliefs and perceptions that contribute to health risk and health protective behaviours in young UK South Asian families and to develop a theory which can be used to define specific objectives that lead to effective behaviour change to improve health outcomes for this population. Design Grounded theory methodology was applied to investigate how factors influence South Asian mother’s decisions to engage in health behaviours for themselves and their children taking into account specific beliefs and practices influencing health behaviours. Semi-structured interviews were carried out with seven female participants who were mothers to young children aged 5-12 years of age. Results The grounded theory is underpinned by three categories that emerged out of analysis of the data; cultural identity, health beliefs and barriers. These categories and their properties, tell the story of the influences and pressures on South Asian mothers as they attempt to negotiate a healthy family lifestyle. The data emerged to form a grounded theory of the balancing act South Asian mothers engage in to negotiate a healthy family lifestyle. Conclusions This study contributes to an improved understanding of the unique factors influencing young South Asian family’s health behaviours and recognition of the need to help them to find a healthier lifestyle balance. In addition, it has revealed how these factors relate to the initiation and maintenance of a healthy lifestyle and will be of use to health professionals and service providers when designing interventions to address and prevent health inequalities among this group. Emphasising the need to involve both the family and their community in interventions, in order for them to be effective. Limitations of these findings and their implications for future research and practice are considered.
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Lourenço, Carlos Eduardo Ribeiro. "Contribuição para o fabrico de motor de ciclo sobre-expandido." Master's thesis, 2012. http://hdl.handle.net/1822/22676.

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Dissertação de mestrado integrado em Engenharia Mecânica
Desde o aparecimento dos primeiros motores de combustão interna, estes têm sido constantemente alvo de evoluções em função das necessidades do meio ao qual se destinam, seja a procura por melhor fiabilidade, por maiores potências ou mesmo pela otimização dos mesmos de modo a tornar o seu custo de produção mais sustentável. Atualmente existe uma crescente preocupação pelos problemas ambientais, bem como pela escassez das reservas de petróleo, o que associado à crise económico-financeira vivida torna a procura por uma maior eficiência energética dos motores de combustão interna, o principal campo de evolução dos mesmos. Neste contexto, surge o conceito de motor sobre-expandido, sendo este um tipo de motor que apresenta rendimentos superiores aos motores convencionais, permitindo deste modo registar valores de consumos e emissões de poluentes francamente inferiores aos dos motores convencionais. O presente trabalho tem como finalidade o fabrico de um motor de combustão interna, mais concretamente o UMotor. Este é um motor de ciclo sobre-expandido que vem sendo desenvolvido há já alguns anos no Departamento de Engenharia Mecânica da Universidade do Minho e que se destina a equipar o EconomicUM. O trabalho apresentado faz inicialmente um enquadramento teórico acerca dos motores de ciclo sobre-expandido, dando a conhecer a sua origem, o seu principio de funcionamento e o seu papel na sociedade atual. Posteriormente, o trabalho é focado no desenvolvimento e fabrico de alguns componentes do UMotor, tais como o cárter, a árvore de cames, os balanceiros, a cambota e o coletor de admissão. Ao longo do trabalho apresentado são dadas a conhecer as diferentes fases no desenvolvimento dos componentes, desde o projeto dos mesmos utilizando ferramentas CAD/CAM, aos processos de fabrico utilizados bem como os procedimentos a ser adotado de modo a que no futuro se concretize a realização de um protótipo funcional do motor.
Since internal combustion engines made their early appearance, continuous evolutions took place in order to fulfill the requests of their application domains, whether pursuing reliability improvement, higher engine power or even manufacturing optimization and cost sustainability. Nowadays there is a growing concern about environmental issues, including oil reserves shortage, economic and financial crisis impact, so driving critical increase of energetic efficiency in internal combustion engines, as a field of study. In this context arises the concept of over-expanded engine, for it shows higher efficiency, allowing less fuel consumption and lower polluting emissions than conventional engines. The present work describes the manufacturing constraints and solutions of an experimental internal combustion engine, the UMotor. This is an over-expanded cycle engine under development in the Department of Mechanical Engineering of University of Minho, to equip the EconomicUM, a formula Shell® prototype vehicle. A theoretical overview is presented about the over-expanded cycle engines, describing its principles of operation and their possibilities in the society. The work is focused on the development and manufacturing of components of the engine, including the crankcase, the camshaft, the rocker arms, the crankshaft and the intake manifold. The work presents an overview of the actual stage in the development of components, including modifications to the project using CAD/CAM tools, and describes the manufacturing processes and procedures to be undertaken in the near future to achieve a fully functional prototype engine.
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