Examensarbeten för masterexamen // Master Theses

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Genetic Algorithms for human-like expressions in an autonomous vehicle
Gosálvez White, Alberto; Birkisson, Róbert Fjölnir; Chalmers tekniska högskola / Institutionen för mekanik och maritima vetenskaper; Chalmers University of Technology / Department of Mechanics and Maritime Sciences; Wolff, Krister; Tenghamn, Johan
Advancing AI technologies have bridged the gap between science fiction and reality, and a future where advanced human-robotic interaction is common doesn’t seem far away. While AI models are getting smarter in conversation and reasoning they are still missing a crucial piece in human communication, namely facial expressions. In this project, we investigate the prospect of using a Genetic Algorithm with Behavior Trees to create the illusion of having emotions for an autonomous vehicle. The vehicle, called Will-e, determines on its own an appropriate emotional state and then expresses those emotions using LED-matrices in the form of eyes and a mouth. We implement these algorithms, train them, and test them in a populated setting and explore how people interact with the robot.
CFD study on ducted rotors for an Urban Air Mobility (UAM) vehicle. A performance validation of coaxial rotors for an Urban Air Mobility vehicle
Gnanaraj, Kevin; Chalmers tekniska högskola / Institutionen för mekanik och maritima vetenskaper; Chalmers University of Technology / Department of Mechanics and Maritime Sciences; Zhao, Xin; Rodriguez Acero,, Patxi Daniel
Urban Air Mobility vehicles show promise for use as air ambulances due to the potential to decrease the area footprint of the vehicle, and also facilitates loading from both the side and back of the aircraft, improving vehicle accessibility. Challenges remain in selecting effective propulsion systems for a proposed vehicle to be used in the Västra Götalands region of Sweden, which include the ability of commercial fixed pitch propellers to produce sufficient thrust to ensure safety in case of failure of one of four propulsion units, composed of coaxial rotor pairs in a contra-rotating configuration. The aerodynamics of propellers is a well studied science, and is relatively simple to predict performance of a propeller given an accurate description of its airfoil geometry from empirical relations. Much research has been done on quantifying the performance of coaxial rotor systems, identifying theoretical empirical limits and advantages of such a configuration, allowing for more limited prediction of performance. Ducted rotors are also well studied in tubomachinery theory, and investigations have been carried out on ducted propellers, but vehicles using coaxial ducted propellers are not as common as unshrouded propellers, and thus this configuration will have to be investigated further to gain an understanding of the factors that affect system performance. This investigation examines the feasibility of selected propellers to adequately power the proposed vehicle in single, coaxial and ducted configurations through numerical analysis and comparison to experimental data where available, and extending the numerical analysis methodology to untested propulsion configurations. Results from the investigation revealed that geometrical accuracy of a propeller model is vital to accurately predicting performance of a propeller through numerical analysis, and comparisons to experimental data can help improve the quality of simulated data to extend the analysis to areas where no experimental data is available. This was the case for coaxial simulations, where the results from the single propeller simulation were compared to available experimental data, used to improve the accuracy of the simulation output data, extended to a coaxial configuration, and verified experimentally. The results also showed that the propellers investigated could meet the thrust requirements for a proposed vehicle under specific conditions in a coaxial configuration, which improved system efficiency over a single propeller, validating the use of numerical simulation of a coaxial propulsion system. The limited duct simulation showed worse performance than a single propeller, but provided a starting point for improved duct design and further numerical analysis.
Triboelectric nanogenerators for energy harvesting in tires
Udén, Vincent; Chalmers tekniska högskola / Institutionen för mekanik och maritima vetenskaper; Chalmers University of Technology / Department of Mechanics and Maritime Sciences; Folkow, Peter
Evaluating potential supply chains for hydrogen as aviation fuel on the Swedish west coast: A quantitative and qualitative study in how hydrogen can potentially be distributed to airports to supply hydrogen-based aircraft
Boström, Hjalmar; Lundell Frostensson, Wim; Chalmers tekniska högskola / Institutionen för mekanik och maritima vetenskaper; Chalmers University of Technology / Department of Mechanics and Maritime Sciences; Brynolf, Selma; Löfving, Joel
Aviation is one of the main polluters within the transport sector and is continuously growing. To be able to meet environmental goals and at the same time fulfill societal demands for transport, hydrogen may be used as an alternative fuel to lower emissions, but research into infrastructure is needed. This thesis uses two methods to quantitatively and qualitatively investigate the potential of different supply chains to supply aircraft with green hydrogen, by conducting a techno-economic analysis and semi-structured interviews with stakeholders. The results of this study show that a transition to hydrogen in aviation is believed to be feasible by stakeholders, and synergetic effects along the Swedish west coast are expected. Centrally produced alternatives are found to be the cheapest alternative early on when volumes are low, while on-site production of hydrogen emerges as the cheapest alternative when demand increases. The results can be used to form an understanding of future airport fuel supply chain planning.
On the CFD Modelling of Monolithic Catalytic Converters using FIDAP for Axi-symmetric, Isothermal, Incompressible and Turbulent Flow
(1994) Grönstedt, Tomas; Chalmers tekniska högskola / Institutionen för tillämpad mekanik; Chalmers University of Technology / Department of Applied Mechanics
Topology Optimization in the Design Process
(2002) Fagerström, Martin; Jansson, Magnus; Chalmers tekniska högskola / Institutionen för tillämpad mekanik; Chalmers University of Technology / Department of Applied Mechanics
An Experimental Study of the Flow Around the Front Wheels of a 20% Scale Car Model in Moving Ground Conditions
(2004) Christoffersen, Lasse Malmkjaer; Chalmers tekniska högskola / Institutionen för tillämpad mekanik; Chalmers University of Technology / Department of Applied Mechanics
This diploma work is based on two parts. The first part is a study of the equipment for the Chalmers wind tunnel with the aim to specify what needs improvement in order to setup a fully functional aerodynamics laboratory. Further it includes the conceptual design of a sting that should carry a car model when using moving ground. The second part contains a study of the flow around a wheel in a wheel house cavity in moving and stationary ground condition. The aim of the study was to try to give further explanation to the change in the drag coefficient so often reported from such studies. The conclusion of the study was somewhat fuzzy owing to the pour function of the experimental equipment. However some good flow visualizations came about that lead to a better understanding of the flow field around the front wheels. The experiment was carried out in the Wind tunnel of Chalmers University of Technology.
A Study of Knee Injury Mechanisms in Car-to-Pedestrian Impacts Using
(2004) Yao, Jianfeng; Chalmers tekniska högskola / Institutionen för tillämpad mekanik; Chalmers University of Technology / Department of Applied Mechanics
The aim of the master thesis was to study the knee injury mechanisms in an impact condition associated with car-to-pedestrian accidents, analyse the influences of the physical parameters on the lower extremity impact responses, and predict the injury risks under different impact conditions. The study also contributed to the evaluation of the validity of the EEVC legform model and a FE model of the lower extremity. For the purpose mentioned above, two substitutes of lower extremity were simulated by using MADYMO MBS-FEM coupling technique and RADIOSS program respectively. One was the EEVC legform model, another the human lower limb model (LLMS) developed by MECALOG in France. The knee and leg injury mechanisms were first investigated using EEVC legform model. The influence of car front structures, upper body mass and presence of tibia fracture on the calculated injury parameters was investigated using total 24 simulations. The LLMS model was refined and evaluated using published cadaver test data. Six simulations of bumper-to-lower extremity impacts were carried out under various loading conditions including two types of car front models at impact speeds of 20 and 40 km/h. The results from LLMS model simulations were analysed and compared with the results from simulations of EEVC legform impacts in terms of injury related parameters: knee shearing displacement, knee bending angle and impact forces. The results showed that the shearing and bending injuries of the knee joint were two important injury mechanisms associated with car-to-pedestrian crash accidents. During the impacts, the major parameters influencing the lower extremity injury severity were bumper stiffness, bumper height and impact velocity. It was confirmed that the upper body mass had certain influence on the knee bending angle and shearing displacement. The tibia fracture had a significant influence on the knee joint injuries. The results also showed that the EEVC legform model was much stiffer than LLMS model for both knee joint and tibia. Further improvement of EEVC legform biofidelity was suggested. The rupture mechanism of the soft tissues in the knee joint was recommended to be simulated in the LLMS model.
Study of steering effects. Virtual testing of front suspension of heavy trucks.
(2005) Axelsson, Erik; Olsson, Mattias; Chalmers tekniska högskola / Institutionen för tillämpad mekanik; Chalmers University of Technology / Department of Applied Mechanics
The truck suspension works today in many different environments. Demands on good handling are high and need to be fulfilled in all possible situations. Good handling needs good control on steering effects. These effects can both be unwanted like brake and bump steering or wanted like understeering. Methods used at Volvo have changed by time from simple geometry sketches and knowledge from test-driving studies to analysis on non-linear FE-models. The department for front suspension and steering at Volvo 3P has developed a non-linear FE model for virtual testing of the front suspension and steering. Steering effects considered in this report are bump, brake and roll steering, with the main emphasis on the last mentioned that has not been previously modeled. The aim of this thesis is to enhance knowledge of steering effects phenomena at Volvo 3P through in-dept studies of output from a complemented and improved modeling of the front suspension steering effects, and to map parameters influence on induced steer angle due to bump, brake and roll load cases. Our approach has been to develop and enhance the load cases of the considered steering effects. The load case representing roll has been broken down into separate parts in order to make the analysis easier. The in-dept analysis of the load cases then gave us a foundation to choose the parameters of the front suspension to be included in the parameter study. The parameter study was then executed with the help of several UNIX, Python and Matlab scripts. The outcome of the steering effects study showed some not well known phenomena, such as twist of the axle beam. The result from the parameter study confirmed the result from the study of steering effects and gave a good picture of the influence of parameter changes. Our conclusion is that modeling of load cases is crucial to get a trustworthy output and that an advanced FE model such as the present is necessary.
Towards modelling of motion of ground vehicle with active suspension
(2005) Chantre Fortes, Samu Almeida; Chalmers tekniska högskola / Institutionen för tillämpad mekanik; Chalmers University of Technology / Department of Applied Mechanics
This master thesis work shows the capability of active and fully-active suspensions to improve the performance of a ground vehicle. The study is based on showing substantial vehicle improvement gains in comparison with the performance of standard vehicle suspension system. Ride comfort (sprung mass acceleration) and handling (tire displacement) are the two main criteria used to evaluate these improvements. Remarkable improvements over the passive suspension are demonstrated base on vehicle simulations and analyses. In this work, the quarter car model is used and has been implemented and simulated in two software environment, MSC.ADAMS and Matlab. The only input is the road profile that introduces vibration to the system. Two road profiles are used: 1) off road and 2) smooth road. First the passive suspension is simulated using the MSC.ADAMS model. At this stage of the work the response of the passive suspension according to road profiles is analyzed and improved in order to get the best suspension setting for each road profile. The next step is to simulate the passive suspension with the founded best settings using MatLab model. This procedure allows the validation of the results achieved with MSC.ADAMS model. Also the values achieved by others researchers are used to verify the accuracy of the results. At this stage of work important conclusion is that for each road profiles a specific suspension setting must be used if one wants to maintain good vehicle performance. Therefore smart suspension that can change their characteristic continuously is a priority in this work. Next step is the implementation of the active and fully-active suspension in MatLab model were control law is used to predict the actuator force. It is assumed that the system is linear; hence the control law is based on a linear state feedback controller where the Linear Quadratic Gaussian regulator, LQG, is used to calculate the feedback gain matrix minimizing the cost function used to calculate the actuator force. It is commonly assumed that the commanded force is produced accurately. Simulation is done without considering the actuators dynamics. The final step is to simulate and analyze the improvements brought by the active and fully-active suspensions. This part of work is performed using the Matlab. Again the best suspension settings found earlier for the two different roads are used in these simulations. For the fully-active suspension apart from the actuator only the spring coil is used whereas in the active suspension both the spring and damper are used in parallel with an actuator. As expected the results show considerable improvements of vehicle ride comfort particularly for the off road. The road handling improvement is minimal in both road profiles. In order to improve the handling these systems must suppress the motion created by the wheel-hop frequency situated at high frequencies values creating higher reaction forces deteriorating the improved ride comfort. Nevertheless, these systems still brings in improvements when particular driving condition arises, for example: reducing pitch motion in acceleration and braking, minimizing rollover in cornering and maintaining the ride height for payload compensation.
Interior design of a volume model
(2005) Duran Murrieta, Daniel; Chalmers tekniska högskola / Institutionen för tillämpad mekanik; Chalmers University of Technology / Department of Applied Mechanics
Ever increasing market competitions pushes automaker to reduce their design cycle and use common components in order to reduce cost. A need to evaluate how the design could look at a very early stage is imperative. The aim of this thesis is to provide the reader with a direction on how to design an interior model, where different seating positions can be used. The goal is to try to use as many CO (Carry Over) components as possible yet achieving completely different looks. Instead of using the traditional approach where all the studies are based on a design, the approach taken is by establishing a bandwidth in which the design could work. The traditional approach has been used for several years and it has been shown to be slow and expensive. By introducing the bandwidth design the goal is to reduce the iterations needed to get a design to work, which will reduce both time and money investments. The term hard point will be introduced and some of the most important hard points on the design of an interior will be discussed. The hard points where established by using UG (Unigraphics) which is the CAD program used by SAAB. In addition to this CAD program Alias and Clay work was done to evaluate all A surfaces (all visible surfaces within a vehicle). Due to the confidentiality of their nature this surfaces can not be included on the thesis, and therefore an explanation on how the hard points where used to evaluate the surfaces will be given. In addition to the above mentioned programs Product Vision was used for illustration purposes. It is important to highlight that in order to establish a hard point a lot of issues have to be taken into account. Some of them include a subjective analysis which can only be acquired by years of automotive experience; hence for each of the hard points established discussions within the different departments where held until an agreement was reached. The result of the work of this thesis was the establishment of two interior volumes which hopefully one day will reach the production market. The work has just started and further hard points are needed to bring the product to life. Further development of hard points is needed especially as the project advances into different stages, the methodology has just begun and how to implement it into the different stages will determine how accurate the parts come out to be.
Design of Front Cab Suspension System for a New Generation Volvo Trucks
(2005) Monroy, Oscar; Cerci, Tekin; Chalmers tekniska högskola / Institutionen för tillämpad mekanik; Chalmers University of Technology / Department of Applied Mechanics
The cab suspension of a truck constitutes the connection of the cab to the frame. Its main task is to suspend the cab from harmful excitations coming from the frame since the life of cab structure and the comfort of driver is mostly dependent on these vibrations. In modern trucks, the entire main truck manufacturers use four-point cab suspension, which means cab, is suspended in both front and rear side of the cab. The main task of this thesis work is to create different solutions to cab suspension problem of the new generation (NG) trucks. The design and development phase of NG trucks is continuous till the product is launched which results in change of boundary conditions during the thesis project. This report complies with the changes made till January 2005. The thesis work starts with the product planning phase, where all the requirements of the product are established, analysis of the main competitors is done and new ideas are generated through brainstorming sessions. The second part is composed of the development phase, where the ideas generated in the product planning phase are developed into final products satisfying the targets set in the planning phase. In this part of the thesis work, two different approaches to the problem are introduced. The first approach is mainly concentrated to solve the problem different suspension mechanism, namely instead of using conventional suspension mechanisms, other alternatives satisfying the requirements are analysed. The second approach is mainly concentrated to change of suspension type, which proposes to use different solutions other than conventional air or mechanical spring types. Results of the development phase leads to different solutions applicable to new generation trucks. As the final steps, all solutions are compared with the requirements as well as the current solution. In conclusion, there are two different mechanism change proposals and alternative suspension type changes which comply with all the requirements for the product, which can be adapted for future design changes.
Computation of the Crack-Driving Force in Elastic-Plastic Materials - A Comparative Study
(2005) Tillberg, Johan; Chalmers tekniska högskola / Institutionen för tillämpad mekanik; Chalmers University of Technology / Department of Applied Mechanics
In fracture mechanics a material force, or the crack-driving force, is defined as the energy release rate due to a small variation of the position of the crack tip. For material, that does not dissipate energy due to irreversible (dissipative) mechanisms, the material force and the classical J-integral are equivalent. The main advantage of using the material force is that it is defined even in the case of elastic-plastic response. In this thesis, two numerical examples are studied. The first example is a central crack in a plate with prescribed stress on the boundary, where linear elastic fracture mechanics (LEFM) is used to obtain the crack-driving force. The results show that the computed stress-intensity factor coincides with the analytic result. The second example describes an edge crack in a plate with prescribed displacement on its upper and lower boundary. In this example, non-linear fracture mechanics (NLFM) is used, in terms of the computation of the material force, to obtain the crack-driving force. The results show that the elastic-plastic material response has significant influence on the investigated measure of the material force.
Finite Element Rail Vibration Dynamics - Ground Improvement with Lime-Cement Columns
(2005) Berg, Sebastian; Larsson, Martin; Chalmers tekniska högskola / Institutionen för tillämpad mekanik; Chalmers University of Technology / Department of Applied Mechanics
Ground vibrations from trains are a major problem for people living close to railway lines. When a high-speed train passes at an embankment constructed on soft soils resonance effects can appear and cause high amplitude vibrations for the surrounding environment. To design appropriate railways without expensive costs on field tests it is important to create models and simulate the effects of countermeasures for the embankment and the surrounding soil. In this thesis countermeasures with Lime-Cement Columns have been integrated into a 3D FEM90 train-induced ground vibration model developed by the Computational Dynamics Group at Chalmers. Three types of configurations of Lime-Cement Columns have been studied: 1. A case with columns straight under the rails (LC-Column Model). 2. Leaning columns under the embankment (LLC-Column Model). 3. Barrier, where the columns is placed outside the embankment. The column configurations has been evaluated and compared when an X2000 train pass in velocities between 140 km/h and 300 km/h. The effect of the angle for the leaning columns has been evaluated as well as the influence of the diameter and the strength of the columns. At the track the simulations demonstrate the importance with columns near the rail when reducing dynamic amplifications at the track. The simulations also show that the effect of the countermeasures in the soil is dependent of the critical velocity of the system. For low train velocities below the critical the columns straight under the track is the most effective. At higher velocities the leaning columns works better regarding the vertical amplitude in the soil. The leaning column angle shows that a higher angle has good effect at the track. In the soil a high angle has opposite effect.
A Numerical Study Of Fibers In A Fluid Flow
(2005) Mark, Andreas; Chalmers tekniska högskola / Institutionen för tillämpad mekanik; Chalmers University of Technology / Department of Applied Mechanics
In the thesis a sphere fiber model is developed and implemented to study flocs of flexible and stiff fibers in a shear flow. The spheres in the model are bounded by springs and the bending force is proportional to the angle between the connected spheres. Fiber-fiber and fiber-wall interactions are included to study flocculation in different geometries. The hydrodynamic interaction is modelled by Stoke drag, which is dependent of neighbouring spheres. To study different kinds of fibers, flows and walls the simulation parameters can easily be changed. The model do not include twisting torque and momentum transfer from fibers to fluid and assumes that the flow is a low Reynolds number flow. The backward differential and Runge-Kutta methods are implemented to solve the equations describing the fiber system, where boundary conditions, step-size and tolerance are dependent of the model. The two methods are compared and the Runge-Kutta method is determined to be the best suited method for this problem. Simulation examples are done to study flocculation in shear flow. Simulated rotational periods and rotation velocities of a stiff fiber are compared with Jeffery's simplified equation. The simulations is showed to follow Jeffery's results but is affected by the inertia included in the model. When inertia effects are made smaller the simulations better approximates the solution of Jeffery's equation which does not include inertia. The simulation program is developed under linux and all the code is written from scratch (except the math library) under Dolfin name spaces in C++. The results in the thesis show how flocculation occur and that the fiber simulation program successfully model fibers and fiber flocs in a fluid flow.
Development and Validation of Mathematical Model to Optimize a New Pedestrian Sensor Concept
(2005) Huang, Sunan; Chalmers tekniska högskola / Institutionen för tillämpad mekanik; Chalmers University of Technology / Department of Applied Mechanics
ABSTRACT - EEVC proposed the pedestrian headform impact test procedure to minimize the risk of head injuries in passenger car to pedestrian collisions. To meet the test requirements one protective system was developed and named Active Hood. It consists of a hood that is lifted in the rear end in case of a pedestrian impact. To activate it a contact sensor placed in the bumper is needed. An important issue of the sensor system to be solved is the temperature sensitivity arising from the unstable stiffness of bumper foam with the variety of environment temperature. A new concept pedestrian sensor has thus been developed and it should be less temperature dependent. This study aims at development of mathematical model of a new bumper system. Then the model will be used to optimize the new pedestrian sensor concept so as to solve the temperature sensitivity issue. Based on physical tests with simplified experimental bumpers in Autoliv Research, three Finite Element (FE) experimental bumper models have been developed in a first phase. Using these experimental bumper models, 11 physical tests were simulated to obtain the valid material parameters for a production bumper. Then a detailed production bumper FE model has been developed using validated material parameters. The standard production bumper model was evaluated according to EEVC WG17 test procedure requirements. Two aspects of improvement were then made on this model for the purpose that the improved FE bumper model can meet the requirements of the EEVC WG17 legform test procedure. Based on the improved bumper FE model, the new pedestrian sensor has been introduced in bumper foam and optimization has been carried out with varying concept sensor parameters. According to the optimization analysis, the smaller sensor tube diameter will lead to a better result. In all the tested parameters, the 25 mm diameter of sensor tube with 2.5 bars initial air pressure can give a high distinction of sensor signals when impact with objects of different masses. The signals from this FE model are less temperature dependent, which provided a mathematical model and background knowledge for a pedestrian sensing system design.
Simulation of effect of different chassis set up on dynamic performance of a passenger car.
(2005) Ahmed, Shamim; Chalmers tekniska högskola / Institutionen för tillämpad mekanik; Chalmers University of Technology / Department of Applied Mechanics
Development of a subframe for 20 feet ISO containers on rigid trucks
(2005) Hatesse, Eric; Krona, Johan; Chalmers tekniska högskola / Institutionen för tillämpad mekanik; Chalmers University of Technology / Department of Applied Mechanics
This report presents the achievements of the Master Thesis Work that has made at Volvo Truck Corporation. The task consists in developing a subframe that will be fitted on a rigid truck able to carry 20 feet ISO-Containers. The main purpose of the subframe is to support the truck chassis while attaching the container by lock members mounted on the subframe. The design criteria for the subframe are that the construction should prevent rattling, limit high torsion to the chassis, and withstand the forces created from a fully loaded container. The result of the thesis consists in four different solutions, two of which grew from a totally new design, while the other two are based on design ideas from an already existing solution used at Volvo Trucks for carrying swap bodies. The recommendation for the future is to choose for further develop the design concept based on the existing solution for swap bodies as a first step. In the next phase the concept based on totally new design should be fully developed and analysed from manufacturing aspects.
Toeards modelling and optimisation of semi-active suspension. Magnetorheological damper and magnetostrictive electric generator.
(2005) Andersson, Christian; Stojanovic, Bojan; Chalmers tekniska högskola / Institutionen för tillämpad mekanik; Chalmers University of Technology / Department of Applied Mechanics
Magnetorhelogical technology is a promising method for avoiding conflicts associated with optimisation of vehicle suspensions. With MR dampers, the damping coefficient can be varied by applying relatively small magnetic fields. Multi-criteria optimisation was conducted to investigate the potential performance improvements obtainable with this technology. Vehicle simulations were implemented in Matlab using a quarter car model, after which the results were verified in Adams. Apart from performance, the electric current necessary to sustain the system was estimated. Additionally, an attempt to convert mechanical into electric power was made using a magnetostrictive electric generator, or MEG. An adaptive structure consisting of a rack and pinion and a cam was designed to amplify the frequency of excitation, and thereby enhance the MEG s conversion efficiency. Finally, its effect on passenger comfort was investigated. The simulations showed that MR dampers can have a positive effect, particularly to counteract motion caused by load shifts. Installation of the harvesting device was found to have a negative influence on passenger comfort, and thus requires further development.
Modelling and Design of an Air-cushioned Hitch for Passenger Cars
(2005) Gutierrez, Enrique; Lemoine, Julien; Chalmers tekniska högskola / Institutionen för tillämpad mekanik; Chalmers University of Technology / Department of Applied Mechanics
Comfort and road handling are two mains areas in which car engineers put a lot of efforts. Suspensions are designed to offer the best compromise between well-being and safety. However, leisure market is appreciably increasing those years and more and more people use their car to carry features as boats, motorbikes or caravans. Extra weight is brought on the rear axle of the towing vehicle, the front one tending to lift. Thus, suspensions efficiency decreases leading to nuisances in comfort or handling. The two major motions that have to be controlled are pitch and bounce. The first represents the rotation of the car around its transversal axis, the second deals with the vertical displacement of the vehicle. The purpose of the thesis consists in modelling and designing an air-cushioned hitch that will reduce vibrations on both car and trailer. This kind of product already exists, especially in the truck field. Indeed, many trucks use a system called fifth wheel that absorbs energy due to the motion of the trailer. Then, the challenge of this project is to design a system applicable on common passenger cars and determining adequate structural parameters values for suspension features. MSC.ADAMS/View and MSC.ADAMS/Insight are the softwares used in this purpose. A simplified model based on mass-spring-damper system is implemented and allows obtaining suboptimal stiffness/damping for the air hitch. This simulation is also a way to get insight into the performance of the product. Design development has been established using Solidworks. All parts are created respecting space constraints and regulations and assembled to give the final product. FEM analysis is performed to check if strength requirements are fulfilled. One of the results from this work is a document with dimensions and characteristics of the final product that can reduce about 30% of vibrations. The air hitch is aimed to be industrialized. However, rig tests and manufacturing cost analysis have to be achieved in order to validate design choices.

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