Multi-point random vibration analysis method for vehicle-mounted equipment
A technology of random vibration and analysis method, applied in the field of rail transit simulation analysis, can solve the problems of low simulation accuracy, failure to consider multi-point input effects, inability to accurately simulate the real environment, etc., and achieve the effect of improving analysis accuracy and having targeted effects
Pending Publication Date: 2022-03-18
ZHUZHOU CSR TIMES ELECTRIC CO LTD
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[0009] The purpose of the present invention is to provide a multi-point random vibration analysis method for vehicle-mounted equipment, which solves the problems that the prior art does not consider the multi-point input effect, cannot accurately simulate the real environment, and has low simulation accuracy
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[0059] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the invention, not to limit the invention.
[0060] The multi-point input effect is usually characterized by the acceleration load correlation function at different input points.
[0061] At present, there are few studies on the correlation function of on-board equipment load in the field of rail transit, and there is no mature and available correlation function model.
[0062]In the following embodiments, the vehicle-mounted equipment is a converter for further description.
[0063] figure 2 A flowchart of a multi-point random vibration analysis method for a converter according to an embodiment of the present invention is disclosed, as shown in figure ...
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The invention relates to the field of rail transit simulation analysis, in particular to a multi-point random vibration analysis method for vehicle-mounted equipment. The method comprises the following steps: S1, analyzing actually measured road spectrum data, and calculating by combining a correlation model to obtain a load correlation function matrix; s2, combining the load correlation function matrix with a random load model to calculate a multi-point input load matrix; s3, performing Cholesky decomposition on the multi-point input load matrix to obtain a deterministic spectrum load matrix; s4, carrying out finite element frequency response analysis on the deterministic frequency spectrum load matrix, and calculating to obtain a stress result of the deterministic frequency spectrum load matrix; S5, carrying out Lie algebraic transformation on the stress result to obtain a power spectrum density function and a root-mean-square function of stress response; and S6, based on a Miner linear cumulative damage criterion, performing fatigue damage analysis on the root-mean-square function of the stress response. The multi-point input load model based on the actually measured road spectrum is used, the analysis precision is improved, and the method is better matched with the actual working condition.
Description
technical field [0001] The invention relates to the field of rail traffic simulation analysis, and more specifically, relates to a multi-point random vibration analysis method for vehicle-mounted equipment. Background technique [0002] Rail transit converter equipment is usually suspended under the car body, and will be subjected to complex and harsh vibration environments during service, so its vibration reliability and fatigue life have attracted much attention. [0003] In the structural design process of converter equipment, it is usually necessary to check the strength, stiffness and fatigue life through simulation analysis. [0004] figure 1 A schematic diagram of typical rail transit AC equipment that reveals the prior art, such as figure 1 As shown in a typical rail transit conversion equipment, the cabinet body 1 is connected to the car body through the lifting lug 2, so the main load it receives is the input of the car body through the lifting lug 2. [0005] T...
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IPC IPC(8): G06F30/15G06F30/23G06F111/08G06F119/14
CPCG06F30/15G06F30/23G06F2111/08G06F2119/14
Inventor 李榆银唐雄辉龙春唐晓雅王玉斌刘丁豪
Owner ZHUZHOU CSR TIMES ELECTRIC CO LTD