The paper deals with a general method for the multi-criteria optimization of the rear wheels suspension mechanisms in terms of kinematic behavior. The suspension mechanism is decomposed in basic binary links, and the kinematic synthesis is separately performed for each of them. The design variables are the global coordinates of the joint locations on the car body (chassis). The disposing of the joints on the wheel carrier were exclusively established by constructive criteria. The design objectives relate to kinematic position parameters of the wheel (displacements of the wheel centre along longitudinal and transversal directions, and modifications of the wheel axis direction), the optimization goal being to minimize these variations during the wheel travel. A computer program for the kinematic study was developed in C++. The application was performed for the wheel suspension mechanism of a race car.Keywords: Car, wheel suspension mechanism, kinematics, optimal synthesis. RESUMENEl artículo se ocupa de un método general para la optimización multiobjetivo de los mecanismos de suspensión de las ruedas posteriores en términos de comportamiento cinemático. El mecanismo de suspensión se descompone en enlaces binarios básicos, y la síntesis cinemática se realizó por separado para cada uno de ellos. Las variables de diseño son las coordenadas globales de las ubicaciones de las articulaciones en el chasis. La disposición de las articulaciones en el soporte de la rueda se estableció exclusivamente por criterios constructivos. Los objetivos de diseño se refieren a la posición de los parámetros cinemáticos de la rueda. El propósito de la optimización consiste en minimizar estas variaciones. Un programa informático para el estudio cinemático fue desarrollado en C ++. La aplicación numérica se llevó a cabo para el mecanismo de suspensión de un vehículo monoplaza.Palabras clave: Automóvil, mecanismo de suspensión de la rueda, cinemática, síntesis óptima.
This paper approaches the multi-criteria kinematic optimization of a front multi-link suspension mechanism. The optimization purpose is to minimize the variations of the wheel track, wheelbase, castor angle, and induced deflection angle, the monitored values being the root mean squares during simulation. The locations of the joints by which the guiding links/arms are connected to the adjacent parts are used as independent variables in the optimization process. The investigation strategy is based on a design of experiments technique - DOE Screening, obtaining the appropriate regression model. The goodness-of-fit has been verified by computing the variance in the predicted results versus the real data, the probability that the fitted model has no useful terms, and the significance of the regression. The study is performed by using the multi-body system environment ADAMS of MSC Software.
The purpose of the present work was to design, optimize, and test an innovative suspension system for race cars. The study was based on a comprehensive approach that involved conceptual design, modeling, simulation and optimization, and development and testing of the experimental model of the proposed suspension system. The optimization process was approached through multi-objective optimal design techniques, based on design of experiments (DOE) investigation strategies and regression models. At the same time, a synthesis method based on the least squares approach was developed and integrated in the optimal design algorithm. The design in the virtual environment was achieved by using the multi-body systems (MBS) software package ADAMS, more precisely ADAMS/View—for modeling and simulation, and ADAMS/Insight—for multi-objective optimization. The physical prototype of proposed suspension system was implemented and tested with the help of BlueStreamline, the Formula Student race car of the Transilvania University of Brașov. The dynamic behavior of the prototype was evaluated by specific experimental tests, similar to those the single seater would have to pass through in the competitions. Both the virtual and experimental results proved the performance of the proposed suspension system, as well as the usefulness of the design algorithm by which the novel suspension was developed.
This work deals with the multi-objective dynamic optimization of the suspension system used for the front wheels of a single-seater vehicle. A half-car model is developed, considering the front suspension system mounted, while the rear suspension is replaced with a fictive spherical joint that is placed at the rear axle level. The purpose of the dynamic optimization is to minimize the chassis oscillations (yaw, pitch and roll), the monitored value for each design objective being the root mean square (RMS) during the dynamic simulation. The locations of some important attachments from the suspension system are used as design variables for the dynamic optimization. The dynamic model is analyzed in the passing over bumps regime, the wheels being anchored on driving actuators, whose motion simulate the road profile. Specific modules of the MBS (Multi-Body Systems) software environment MSC.ADAMS are used in this study.
In this paper, we attempt to carry out the dynamic analysis of a motor vehicle, using the virtual prototype developed with the MBS (Multi-Body Systems) software ADAMS. The virtual prototype includes the front and the rear suspension subsystems, the steering subsystem, and the car body subsystem. The experiment designed is one frequently carried by the automotive manufacturers, namely passing over bumps. The connection between wheels (tires) and road (ground) is made using contact forces, which allow modelling how adjacent bodies interact with one another when they collide during the simulation. On the virtual prototype, several measurements have been realized having in view to evaluate the dynamic behaviour of the vehicle.
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