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The Axles of SxS Vehicles
Štolpa, Radek ; Hejtmánek, Petr (referee) ; Blaťák, Ondřej (advisor)
The diploma thesis deals primarily with the topic of the kinematics of the wheel suspension that has a significant effect on the dynamics of the whole vehicle. The thesis gives a general overview of kinematic characteristics and their impact on driving characteristics. It deals with load transfers that occur due to lateral and longitudinal accelerations. The thesis analyses the axles of the SxS vehicle, which has wheel strokes up to 600 mm. The axles have high requirements for changes in kinematic characteristics. The thesis provides an overview of the used axles and then compares them with the original ones. The thesis contains its design of axles with the procedure and evaluation of differences compared to the other axles specified by the boundary conditions. An algorithm using analytical geometry was also created where instant centre positions, roll centres and anti-characteristics for the static position of the vehicle can be calculated. In conclusion, it contains a sensitivity analysis, which aims to acquaint with the effects of kinematic connections of double wishbone suspensions on the kinematic characteristics.
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The Axles of SxS Vehicles
Štolpa, Radek ; Hejtmánek, Petr (referee) ; Blaťák, Ondřej (advisor)
The diploma thesis deals primarily with the topic of the kinematics of the wheel suspension that has a significant effect on the dynamics of the whole vehicle. The thesis gives a general overview of kinematic characteristics and their impact on driving characteristics. It deals with load transfers that occur due to lateral and longitudinal accelerations. The thesis analyses the axles of the SxS vehicle, which has wheel strokes up to 600 mm. The axles have high requirements for changes in kinematic characteristics. The thesis provides an overview of the used axles and then compares them with the original ones. The thesis contains its design of axles with the procedure and evaluation of differences compared to the other axles specified by the boundary conditions. An algorithm using analytical geometry was also created where instant centre positions, roll centres and anti-characteristics for the static position of the vehicle can be calculated. In conclusion, it contains a sensitivity analysis, which aims to acquaint with the effects of kinematic connections of double wishbone suspensions on the kinematic characteristics.
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Kinematics and elastokinematics of independent multi-link suspension of axle using flexible supporting elements
Vrána, Tomáš ; Kovanda, Jan (advisor) ; Ladislav, Ladislav (referee)
This thesis deals with elasto-kinematic properties of multi-link rear suspension
system, based on simulations. The creation of computational model and simulation of
elastokinematics are based on specialized modules of the HyperWorks software. The
thesis idea is to create new models and improve their properties.
The chapter introduction presents and discusses the current knowledge state in the
issue of elasto-kinematic characteristics of the vehicle suspension. Previously published
works are presented in this section. The following section defines basic terms, features
and design elements concerning the topic vehicle suspension and vehicle axle, which
can help readers to orientate in this field.
The first part of the thesis is focused on the collection of high-quality input data to
create the MBS computational model based on the real suspension components. The
determination of kinematic suspension points, experimental measurements of inertia
moments of supporting elements of the suspension and measurements of deformation
characteristics of rubber-metal bushings are presented in the thesis. There are also
measuring characteristics of force elements such as springs or shock absorbers. Then the
proposed method of measuring elasto-kinematic characteristics of the suspension using
testing machine for model validation is also introduced.
The second and main part is devoted to creating a new MBS simulation models of
multi-link rear suspension using HyperWorks system. The suspension model is
improved by successive steps, from kinematic model, through model with flexibility of
the bushings, to the complex model in which the flexible properties of all supporting
elements are reflected. The properties of the used models are described together with
arising calculation problems. The results discuss the impact of elements flexibility and
individual structural alternatives on elasto-kinematic characteristics of the suspension
system.
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