Vinkelväxlar och slutväxlar spelar en viktig roll för kraftöverföringen mellan motor och hjuli fyrhjulsdrivna bilar. Med en ökande konkurrens finns en efterfrågan för att ständigt förbättraeffektivitet, ljudgenereringegenskaper och hållfasthet. För att uppnå detta krävs en bättreförståelse av systemets dynamiska egenskaper. En detaljerad numerisk dynamisk modell ärdock ofta beräkningsmässigt tung och tidskrävande. Verktygen för den dynamiska modelleringenbehöver bli mer effektiva och i vissa fall kan en kombinationen av två verktyg vara ett bättrealternativ. Denna integrerade plattform kan användas för att effektivt modellera dynamiken ochfå en bättre inblick i systemts beteende.Vinkelväxlen är en enhet vars funktion är att fördela kraften mellan fram- och bakaxel. De viktigastekomponenterna i vinkelväxeln är en hypoid-drevsats och en klokoppling, som aktiveras närkraft ska överföras till bakaxeln via kardanaxeln. Detta arbete modellerar dynamiskt beteendei vinkelväxeln och har sytftet att beräkna transmissionsfelet i systemet och dess effekt somexciteringskälla av ljud och vibrationer i systemet. MSC ADAMS har använts för Multi-Bodyberäkningsverktyg för modelleringen.Det beräknade transmissionsfelet har jämfört med testresultat. Dessutom har en co-simuleringmed både ADAMS och SIMULINK genomförts för att skapa en bas för tillämpa optimeringsalgoritmer.Bultarna i bultförbandet samt deras styvhet och förspänning har inkluderats i modellenoch studerats med avseende på effekten på vibrationer i kopplingspunkter, samt algoritmerför optimering har föreslagits. Korrelationen mellan test och beräkning var mycket god, ochdessutom har förslag på hur denna typ av beräkning kan förbättras ytterligare givits. / Automotive drive units play an important role in transmitting power from an engine to the wheels.In today’s competitive world, there is an increasing demand for these devices to be more efficient,quiet, and reliable at the same time. In order to achieve this, a better understanding of system’sdynamic behavior is necessary. A detailed dynamic model of a system is often computationallyintense to solve and time consuming. This demands more efficient tools to be developed and insome cases integrating two or more tools would be a better option. The integrated platform can beused to effectively model the dynamic behavior of a system and get better insights on the systembehavior.Power Transfer Unit (PTU) is a device whose function is to distribute power between a front axleand rear axle. This unit basically includes hypoid gear set and a dog clutch that is engaged whenthere is a requirement to transfer power to the Rear Drive Unit (RDU) through prop shaft. Thismaster thesis describes modeling the dynamic behavior of a PTU with a goal of predicting thetransmission error in the system and its effect as a source of excitation on the entire unit followedby studying system response to this type of excitation. MSC ADAMS was used as a Multi-BodySimulation tool to model the dynamic behavior of the PTU.The transmission error predicted by the simulation was compared with the test results, a cosimulationbetween SIMULINK and ADAMS was established in order to create a platform toapply optimization algorithms. The bolt and bearing stiffness were incorporated in the model andtheir effect on the mounting point accelerations and bearing point accelerations were studied. Itwas found that the bolt stiffness affects the acceleration levels at the coupling points and suitablealgorithms could be applied in order to find an optimum value. As a result of the good correlationbetween test and simulation data, some other useful conclusions have been derived in order todevelop this approach of modeling.

Arbetets syfte är att undersöka hur en planetväxel kan optimeras med avseende på kostnad och momentöverföringskapacitet då det konceptuella balanseringssystemet skapat av Swepart Transmission AB appliceras på en planetväxel. Arbetet undersöker även huruvida höghållfasta stål kan användas för att optimera en planetväxel ytterligare. Planetväxlarna i detta arbete genererades i programvaran KISSsoft och 3D-modeller av dessa planetväxlar skapades i SolidWorks. Olika tillverkningsfel introducerades i en planetväxel och dess inverkan på lastfördelningen mellan planethjulen samt balanseringsystemets förmåga att reducera dessa fel undersöktes med hjälp av programvaran MSC Adams. Resultatet från undersökningarna i MSC Adams användes sedan för att optimera planetväxlarna. För planetväxlarna utfördes slutligen en mass- och kostnadsjämförelse för att undersöka hur konkurrenskraftig en planetväxel med Sweparts balanseringssystemet är jämfört med dagens konventionella planetväxlar.

The diploma thesis deals with the issue of force effects in the three-point hitch links in the multi-body environment depending on the forces ejected to the plow during the plowing. Through simulations, force responses under the tractor wheels are also identified for various conditions. The work is also analyzed for the impact of the upper link attachment relative to the tractor output parameters.

The thesis focuses on investigating and optimizing a bushing script implemented as a tool in MSC ADAMS/Car. The study provides an insight on the representation of a rubber bushing and identify parameters which can be used to define the properties of a bushing in a simulation environment such as ADAMS/Car. The tool being studied here can be used to implement different kind of bushings such as a hydro bushing and a general rubber bushing, but optimization was implemented for the rubber bushing only. With an increasing reliance on Computer Aided Engineering (CAE) tools in the designing process, it is necessary that the vehicle behaviour can be predicted without relying on physical testing. CAE tools reduces the need of prototypes and provides a faster approach to designing vehicles. MSC ADAMS/Car is one such tool, which has been used here to predict the vehicle dynamic behaviour, which will influence the ride, handling and comfort characteristics of the vehicle. Rubber bushings, which have been studied here, have a significant contribution to the overall stiffness of the vehicle and as such, it is imperative that the tool being used here, is accurate and makes the designing process easy. The rubber bushing can be imagined to be a combination of a non-linear elastic spring, a frequency dependent Maxwell component and an amplitude dependent frictional element. In order to ease the design of the bushing properties, a reduced number of input properties are used to calculate the bushing properties internally. While trying to validate the force hysteresis loop obtained through the model with the measured data, it was seen that the accuracy was quite poor for the model when loading it with dynamic loads corresponding to amplitudes of0.2 mm and lower. The quasi-static loading and dynamic loading above 0.2 mm is shown to have a satisfactory accuracy when compared to the measured data.

In today’s competitive automotive industry, most companies are trying to make their new designs and features implemented in their products to be ahead of their competitors. However, in the preliminary design stage of CEVT vehicles, dynamic simulation consumes excessive amount of time depending on the complexity of the dynamic model and simulation settings. It is beneficial and possible to shorten the simulation time. This thesis focuses on reducing the dynamic simulation time in ADAMS/Car in engine suspensions’ early development stage. Five simulation time reducing methods, i.e., reducing end time in driver control maneuver, stopping similar simulations, converting specific flexible parts to rigid parts, properly increasing the step size and performing simulation for engine suspension subsystem instead of the full vehicle system, were proposed and investigated separately to study their effects on the simulation time and the accuracy of the fatigue damage results of the engine suspension. With the proper combination of the five methods, total dynamic simulation time was effectively reduced to 61% and the variation of fatigue damage results of each engine suspension component was controlled within 30%. Dynamic modelling of an exhaust system is also included in this thesis and it provides referential data for the packaging design of exhaust system. / I dagens konkurrensutsatta bilindustri försöker de flesta företag att göra sina nya mönster och funktioner implementerbara i sina produkter för att vara före sina konkurrenter. I det preliminära konstruktionsstadiet av CEVT-fordon förbrukar dynamisk simulering dock en stor tid beroende på komplexiteten hos den dynamiska modellen och simuleringsinställningarna. Det är fördelaktigt och möjligt att förkorta simuleringstiden. Denna avhandling fokuserar på att minska den dynamiska simuleringstiden i ADAMS / Car i motorupphängningens tidiga utvecklingsstadium. Med hjälp av bakgrundsstudier och erfarenheter från CEVT’s personal provades fem olika sätt att minska simuleringstiden, samtidigt som simuleringsresultatens noggrannhet kontrollerades. Varje metod användes separat i simuleringen för att studera effekten på resultatens noggrannhet. I slutet kombineras alla metoder i simuleringen för att få bästa möjliga simuleringstid utan att förlora noggrannhet. Genom att kombinera de fem metoderna reducerades den totala dynamiska simuleringstiden till 61% och variationen i utmattningsskadans resultat av varje motorupphängningskomponent kontrollerades inom 30%. Dynamisk modellering av ett avgassystem ingår också i denna avhandling, vilket ger referensdata för framtida förpackningsdesign av avgassysteme

The object of this master thesis is testing of vehicle using four post rig. The main goal is to make a research about testing and tuning vehicle characteristics on four post rig in order to implement them for testing of TU Brno Racing’s Formula Student racecar. The main method of testing, input signals and measurement description are presented in this thesis. The different methods of analysis of testing data to find best tuning of damper and spring stiffness for different race disciplines are described. In the last part of this work, quarter car model and multibody model in MSC Adams Car is created. Input parameters of model are based on measurements from real car/ component testing, including damper characteristics and static tire radial stiffness for best fit with the characteristics of real vehicle. The measurements themselves were also described in separate chapter of this thesis. The last but not the least goal was to compare these simulations with measurements, made od real four post rig in order to decide whether car model is suitable for racecar development.

This diploma thesis deals with the design of a virtual twin of cross table MCV 754 QUICK from the Czech manufacturer Kovosvit MAS. The research part describes the basic principles of predictive maintenance methodology and virtual twin technology. The practical part includes a simplification of the initial cross table model. This model was then transferred to the simulation software MSC Adams, where it was optimized so that its behavior corresponds as closely as possible to the physical device. Several simulations were subsequently performed on the model. Then a concept for a predictive method for calculating the remaining service life of individual sections of the ball screw was presented. Simulations performed on a virtual twin served as a source of data to test the proposed method.