Stiffness analysis method for attachment point of flexible connection between subframe and vehicle body

Abstract

The invention relates to a stiffness analysis method for - attachment points of a flexible connection between a subframe and a vehicle body. The method comprises the following steps: 1, establishing afinite element model of the subframe corresponding to the geometry and assembly data of the subframe; 2, adjusting the positions of all attachment points of the finite element model of the subframe to be consistent with the design hard points, and establishing the finite element model of the flexible connecting element of the vehicle body and the subframe; 3, taking the constraint on the body side of the flexible connecting element as a boundary condition, applying an exciting force at the attachment point of the chassis member and the subframe, and calculating a first static displacement value under the correspond excitation; 4, after the finite element model of the subframe is rigidified, calculating the second static displacement value by the method of the step 3; 5, calculating the equivalent stiffness of the chassis attachment point of the subframe by two static displacement values. Compared with the prior art, the method can obtain more accurate equivalent stiffness of the attachment point, and is favorable for analyzing and evaluating the stiffness of the attachment points of the subframe chassis with vibration isolation.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a method for analyzing the stiffness of an attachment point for a flexible connection between a subframe and a vehicle body. Background technique [0002] With the continuous development and improvement of automobile technology, passengers have higher and higher requirements on the ride comfort and driving feeling of the vehicle. Vehicles with high vibration and noise and poor handling and driving experience will make passengers feel cheap and uncomfortable, and the subjective experience is poor, which greatly reduces the possibility of potential customers choosing to buy a vehicle. [0003] The sub-frame of the car supports and connects multiple parts of the car. The key components connected to the front sub-frame include powertrain, steering mechanism, control arm and stabilizer bar, etc., and those connected to the rear sub-frame include the rear suspension Connecting rod...

AI Technical Summary

Problems solved by technology

However, when the subframe and the body are flexibly connected, since the mass of the subframe is much smaller than that of the body, the modal of the subframe will be affected by the boundary conditions of the bushing, so the original subframe chassis The analysis method of the attachment point stiffness cannot be effectively used to guide the analysis and evaluation of the attachment point stiffness of the subframe chassis with vibration isolation

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