Vibration damping and energy-absorbing device of vehicle auxiliary frame and method thereof

Abstract

The invention discloses a vibration damping and energy absorption method for an automobile sub-frame, which comprises the steps of (1) performing finite-element analysis to an sub-frame to obtain the quality, the first-order bending mode and the corresponding maximum displacement site of the sub-frame; (2) arranging a mass block with an elastic damping system to damp vibration and absorb energy; and (3) performing modal analysis and experimental verification on the improved sub-frame to correct the elastic damping system and the mass block parameters. The inventive method does not change the current structure of the sub-frame, and arranges the mass block with the elastic damping system in a specific position on the sub-frame to reduce the vibration amplitude by utilizing the principle of resonance energy absorption, so as to reduce the transmission of vibration toward automobile body. The method can also adjust the frequency of vibration damping and energy absorption devices by adjusting the mass of the mass block and the vertical rigidity of the elastic damping system. The inventive method has the advantages of simple structure and not remarkably increased weight and cost, and can maximally damp transmission of the vibration toward the automobile body.

Description

technical field

[0001] The invention relates to a vibration-reducing and energy-absorbing device and a method thereof, in particular to a vibration-reducing and energy-absorbing device on a sub-frame in an automobile suspension system and a method thereof. Background technique

[0002] The vibration inside the car has attracted more and more people's attention. There are two main sources of vibration: 1. The vibration caused by the engine is transmitted to the body through the sub-frame; 2. The vibration caused by the road surface is transmitted through the control arm and The frame is transferred to the body. As an important link in the two transmission paths, the performance of the subframe directly affects the NVH performance of the vehicle. The sub-frame connects the suspension system and the body, which can effectively attenuate the vibration transmitted to the body from factors such as uneven ground and road impact. Therefore, cars generally use a subframe structure,...

Examples

Embodiment 1

[0017] Example 1 as figure 1 As shown, a vibration-damping and energy-absorbing device on the sub-frame of an automobile includes a sub-frame formed by welding the sub-frame lower body 3 and the sub-frame upper body 4, and the sub-frame is connected to the engine and the vehicle body. The method is: an elastic body 2 with elastic damping is arranged at the weakest part of the rigidity of the lower body of the sub-frame (corresponding to the position of maximum displacement) and connected with the mass block 1 . Elastic body 2 is rubber, also can be spring.

[0018] How to design the vibration damping and energy absorption of the sub-frame of the automobile, the steps are as follows:

[0019] 1. Carry out finite element analysis and simulation on the sub-frame to obtain the quality, first-order bending mode and corresponding maximum displacement of the sub-frame;

[0020] 2. Set a mass block with an elastic damping system at the position corresponding to the maximum displacem...

technical field

[0001] The invention relates to a vibration-reducing and energy-absorbing device and a method thereof, in particular to a vibration-reducing and energy-absorbing device on a sub-frame in an automobile suspension system and a method thereof. Background technique

[0002] The vibration inside the car has attracted more and more people's attention. There are two main sources of vibration: 1. The vibration caused by the engine is transmitted to the body through the sub-frame; 2. The vibration caused by the road surface is transmitted through the control arm and The frame is transferred to the body. As an important link in the two transmission paths, the performance of the subframe directly affects the NVH performance of the vehicle. The sub-frame connects the suspension system and the body, which can effectively attenuate the vibration transmitted to the body from factors such as uneven ground and road impact. Therefore, cars generally use a subframe structure,...

Examples

Embodiment 1

[0017] Example 1 as figure 1 As shown, a vibration-damping and energy-absorbing device on the sub-frame of an automobile includes a sub-frame formed by welding the sub-frame lower body 3 and the sub-frame upper body 4, and the sub-frame is connected to the engine and the vehicle body. The method is: an elastic body 2 with elastic damping is arranged at the weakest part of the rigidity of the lower body of the sub-frame (corresponding to the position of maximum displacement) and connected with the mass block 1 . Elastic body 2 is rubber, also can be spring.

[0018] How to design the vibration damping and energy absorption of the sub-frame of the automobile, the steps are as follows:

[0019] 1. Carry out finite element analysis and simulation on the sub-frame to obtain the quality, first-order bending mode and corresponding maximum displacement of the sub-frame;

[0020] 2. Set a mass block with an elastic damping system at the position corresponding to the maximum displacem...

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