Dynamic modeling and simulation method for nonlinear torsion bar spring independent suspension

Abstract

The invention discloses a dynamic modeling and simulation method for a nonlinear torsion bar spring independent suspension. The method comprises the following steps: 1, establishing a nonlinear torsion bar spring independent suspension dynamic model; 2, calibrating a suspension dynamical model; 3, virtually and reversely solving three-way displacement time domain data of the tire grounding position; 4, establishing a triaxial suspension virtual test bed; and 5, simulating dynamics of a suspension. The kinematics and dynamics theories are applied, and the problem that the simulation error is large due to the fact that an existing dynamic modeling and simulation method for the nonlinear torsion bar spring independent suspension is abstracted and simplified too much is solved; meanwhile, the problem of three-axial real road spectrum input adopted by suspension vibration simulation is solved, the simulation efficiency and simulation precision of the suspension vibration performance are improved, and the method has high applicability and operability.

Description

technical field [0001] The invention belongs to the field of technical vehicle dynamics simulation, and in particular relates to a nonlinear torsion bar spring independent suspension dynamics modeling and simulation method. Background technique [0002] Suspension is the general term for the connecting device between the frame and the axle, which mainly plays the role of absorbing and attenuating the impact and vibration of the frame caused by uneven road surface. Suspension is very important to the performance of the car, which is related to the handling stability and comfort of the car, and also affects the subjective feelings of the drivers and passengers. The torsion bar spring independent suspension is mainly composed of torsion bar springs, shock absorbers, buffer blocks, connecting rubber bushes, stabilizer bars and double control arms, and is a highly nonlinear system. When analyzing the kinematics and dynamics characteristics of the torsion bar spring independent s...

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Problems solved by technology

When analyzing the kinematics and dynamics characteristics of the torsion bar spring independent suspension, a simplified multi-degree-of-freedom linear theoretical model is often used. The theoretical analysis process is complicated, and the theoretical analysis results have large errors. In order to solve the problems caused by the above theoretical analysis , suspension dynamics simulation technology provides a high-efficiency, high-precision analysis method

At present, most suspension K&C simulations use the multi-rigid body suspension dynamic model established by ADAMS / CAR software, which can achieve high simulation efficiency and simulation accuracy; however, the suspension vibration simulation still uses the suspension multi-rigid body dynamic model, and in The Z-direction B-level road surface and impulse road surface are applied to the tires, ignoring the nonlinearity of the shock absorber, rubber bushing, buffer block and dual control arms in the suspension, and the influence of real road conditions on the suspension vibration, resulting in the suspension vibration simulation results The problem of large error with the test results

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