Passenger car rearview mirror fatigue durability analysis method based on test and finite element simulation
An analysis method and fatigue durability technology, applied in the field of passenger car rearview mirror fatigue durability analysis, can solve the problems of high cost, consumption, and long development cycle, and achieve the effects of reducing development cost, improving analysis accuracy, and shortening the development cycle
Pending Publication Date: 2021-08-13
开沃新能源汽车集团股份有限公司
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Problems solved by technology
[0004] At present, durability tests are usually used in China to verify whether the fatigue life of vehicle rearview mirrors meets the standards. The disadvantage of this method is that it consumes huge costs and the development cycle is long.
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[0030] The present invention will be further described below in conjunction with the accompanying drawings.
[0031] The present invention is based on the passenger car rearview mirror fatigue durability analysis method (such as figure 1 described), including the following steps:
[0032] Step 1: First establish the finite element model of the rearview mirror.
[0033] details as follows:
[0034] (1) The floating mirror mount, mirror carrier and some non-load-bearing structures are omitted, and the simulation calculation results are safer than the actual ones;
[0035] (2) Extract the middle surface of the shell, ball head cover and rearview mirror rod, and set the thickness, use 2D shell element to simulate, simplify the small features of non-concerned areas, such as small round holes, small steps, etc., use 3D The solid element simulates the wedge-shaped connection block at the installation part and the curved rod casting connecting the mirror body;
[0036] (3) The com...
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The invention discloses a passenger car rearview mirror fatigue durability analysis method based on test and finite element simulation, which comprises the following steps of: firstly, establishing a finite element model of a rearview mirror, performing modal analysis after the finite element model is established, testing a free modal and a constrained modal of the rearview mirror to obtain an inherent frequency, a vibration mode and a modal damping ratio, sorting and analyzing results of the modal simulation and modal testing of the rearview mirror, obtaining acceleration time domain signals of mounting points of the rearview mirror in three directions of XYZ under five road surfaces through road spectrum testing, carrying out data processing to obtain acceleration PSD spectrums of the five road surfaces in the three directions, carrying out envelope processing on the acceleration PSD spectrums in each direction, and taking the acceleration PSD spectrums as input of vibration fatigue simulation to establish a fatigue analysis flow and calculate damage; and reasonably evaluating the rearview mirror according to the simulation result until the simulation result meets the actual requirement. According to the method, the development cost can be reduced, and the development efficiency and accuracy can be improved, so that the problems are solved.
Description
Technical field: [0001] The invention relates to a method for analyzing the fatigue durability of passenger car rearview mirrors based on testing and finite element simulation, which belongs to the technical field of optimization of vehicle rearview mirrors. Background technique: [0002] The rearview mirror is one of the important devices for vehicle active safety. It is generally located on both sides of the vehicle. It is a tool for the driver to directly obtain external information such as the side and bottom of the vehicle while sitting in the cab seat. It can observe the vehicle getting on and off from the left and right. Personnel and pedestrians, cars and other obstacles on both sides to ensure driving safety. The passenger car rearview mirror is generally composed of a housing, a floating mirror mount, a mirror carrier, a fixed cover, a pre-tightening bolt, a ball head cover and a rearview mirror rod. [0003] During the driving process of the passenger car, under ...
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IPC IPC(8): G06F30/23G06F30/15G06F119/04
CPCG06F30/23G06F30/15G06F2119/04
Inventor 康少波胡鸿飞张勇曹俊
Owner 开沃新能源汽车集团股份有限公司