![]() ![]() Based on swept-sine input simulation, the change law of the transient response index in low and high frequency, and the relationship between the opening angle and the transient stability index are obtained. The influence of the opening angle on the suspension performance and the mechanism are analyzed through simulation. The rigid-flexible coupling model of torsion beam suspension and the multi-body dynamics model of the vehicle are established. ![]() According to the established 3-DOF vehicle dynamic model, the transfer functions of the vehicle response index relative to the steering wheel angle are deduced. It also explains why the changes in the suspension’s roll stiffness and the load transfer between the left and right wheels affect the handling stability. Taking torsion beam suspension as the research object, the kinematics characteristics of the suspension are analyzed, and the expressions of the wheel alignment parameters are established. It was evaluated the influence of both the position and orientation of the torsion beam on the suspension, under symmetric and asymmetric loadings. The main objective of this work was to evaluate through numerical simu lation based on finite element method, the influence of the torsion beam on the kinematic behavior of a twist-beam suspension. Thus, the use of software based only on the rigid body dynamics is not suitable to analy ze this type of suspension. The evaluation of the deformation of this flexib le element becomes essential to understand their kinemat ic behavior. Un like other types of suspension, the twist-beam has a flexib le torsion beam connecting the swing arms. ![]() Despite its acceptance in the automotive market there are few studies related to the twist -beam suspension, perhaps because of its simplicity and low cost design and ease of manufa cturing. It is estimated that more than 90% of light vehicles manufactured in emergent countries use this type of suspension at the rear. This solution presents a very satisfactory performance when applied to light vehicles and has an excellent relationship between cost / benefit in the automotive market. Twist-beam suspensions are an examp le of this co mpetit ive environ ment. In addition, the search for solutions of lo w cost and satisfactory performance is essential for the success of the product in the world market. ![]() The use of numerical simu lations in the design of automotive components has contributed to reducing the design time, decreasing the prototypes costs and increasing reliability of the final product. It is carried out and a complex theoretical model of the suspension with longitudinal torsion bars and flexible lamella, validated via the experimental research, that allows the optimization of such a suspension. The paper aims to highlight this influence by the experimental determination of the elastic characteristic of the suspension with and without lamella and the comparing of the two elastic characteristics. Via this second function it is improved the elastic characteristic aspect of the suspension with positive consequences on the comfort and safety. So, the flexible lamella has two functions: reduces the roll oscillations and works as an additional elastic element of the suspension. There are constructive solutions of suspensions with torsion bar as elastic element, longitudinal disposed, and that replaces the conventional stabiliser bar with a flexible lamella connected between the ends of the longitudinal torsion bars. A main component of the car suspension is the stabiliser bar, that has the role to reduce the roll oscillations, and it is constructively materializes, within the conventional suspension, via a transversal torsion bar connected direct and indirect between the wheels of the axle. ![]()
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