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Rail train bogie fatigue life estimation method

A fatigue life and rail train technology, applied in the mechanical field, can solve the problems of inability to truly monitor stress concentration points, inability to accurately monitor the stress condition of the framework, increase data acquisition and maintenance costs, etc., so as to avoid installation acquisition costs and maintenance costs. , to avoid the large gap between actual working conditions and the effect of accurate fatigue life

Pending Publication Date: 2020-09-15
GUANGZHOU METRO GRP CO LTD +2
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Problems solved by technology

Therefore, the test method may not be able to truly monitor the stress concentration point, and cannot accurately monitor the stress situation of the structure, and there are many sensors, which increase the cost of data collection and maintenance

Method used

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  • Rail train bogie fatigue life estimation method
  • Rail train bogie fatigue life estimation method
  • Rail train bogie fatigue life estimation method

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Embodiment 1

[0047] The present invention aims to propose a method for estimating the fatigue life of rail train bogies. The present invention calculates the theoretical stress of the monitoring point after the external load is applied through the method of finite element simulation, and uses the stress superposition theory to solve the coefficient of the stress of each monitoring point and the external load. matrix. Then, the stress value during the actual operation of the train is monitored by adding a stress acquisition sensor, and the coefficient matrix calculated by the theoretical method is used to invert the force of the train during the actual process. Finally, the stress history of the frame is obtained by loading the actual force into the theoretical model. , the fatigue life of the weak point of fatigue life is calculated, that is, the fatigue life of the frame.

[0048] Such as figure 1 Shown, a kind of railway train bogie fatigue life estimation method of the present inventio...

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Abstract

The invention discloses a rail train bogie fatigue life estimation method. The method comprises the steps: S1, establishing a finite element analysis model of a bogie framework; s2, applying a boundary condition and an external required load to the finite element analysis model constructed in the step S1, and performing finite element analysis and calculation; s3, selecting a stress monitoring point for stress monitoring, and inversing the numerical relationship BX = Y between the monitoring point and the external load, wherein B is a coefficient matrix, X is an external load column matrix, and Y is a value matrix of the stress monitoring point; s4, arranging stress monitoring points on the actual bogie, monitoring stress, obtaining an actual stress monitoring value, and meanwhile calculating the actual external load in combination with the numerical relationship between the monitoring points obtained in the step S3 and the external load; and S5, applying the actual external load calculated in the step S4 to the finite element model in the step S1 for analysis, and selecting a node with a relatively large stress cycle for fatigue life estimation, thereby predicting the residual life of the framework and guiding the actual operation of the train.

Description

technical field [0001] The invention relates to the technical field of machinery, in particular to a method for estimating the fatigue life of a rail train bogie. Background technique [0002] With the development of rail transit, the research on the health management of the whole life cycle of the train has become one of the key research directions of the vehicle manufacturing unit and the urban rail train maintenance unit. As one of the core components of the vehicle, the health performance evaluation of the bogie The method has become an important research direction. [0003] The main failure form of the bogie is the fatigue failure of the frame, and the calculation of the bogie fatigue life is an effective method for evaluating the health of the bogie and predicting its life. The traditional frame fatigue life calculation is mainly divided into two methods: theoretical model calculation and test result test. The steps of the theoretical calculation method are generally...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/15G06F30/23G06F119/04G06F119/14
CPCG06F30/15G06F30/23G06F2119/04G06F2119/14Y02T90/00
Inventor 朱士友苏钊颐陶涛陈晓亮陆文教张子舆胡林桥
Owner GUANGZHOU METRO GRP CO LTD
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