Method for predicting fatigue life of wide-body mining vehicle frame

A technology for fatigue life prediction and mining vehicles, which is applied to instruments, electrical digital data processing, computer-aided design, etc., to achieve the effects of low cost, strong practicability, and high efficiency

Pending Publication Date: 2020-06-05
SANY HEAVY EQUIP
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Problems solved by technology

[0004] The present invention provides a method for predicting the fatigue life of a frame of a wide-body mining vehicle, which can accurately find the dangerous position with low fatigue life of the frame and predict the wide-body min

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  • Method for predicting fatigue life of wide-body mining vehicle frame
  • Method for predicting fatigue life of wide-body mining vehicle frame
  • Method for predicting fatigue life of wide-body mining vehicle frame

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[0037] Example

[0038] Refer to figure 1 , A system for predicting the fatigue life of a wide-body mining vehicle frame includes a test module, a rigid-flexible coupling model modeling module for the vehicle, a virtual iteration module, and a frame fatigue life prediction module.

[0039] The test module is mainly used to extract the acceleration signal on the axle head of the wide-body mining vehicle axle.

[0040] Refer to figure 2 For the multi-rigid body dynamics model of the whole vehicle, the rigid body of the frame needs to be replaced with the flexible body of the frame later. The vehicle rigid-flexible coupling model modeling module is used to establish the vehicle rigid-flexible coupling model for subsequent virtual iteration and extraction of the load of the frame connection point. Based on the theory of multi-body dynamics and modal synthesis method, three models of the frame flexible body, rigid body subsystem, and excitation test bench are established.

[0041] Refer ...

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Abstract

The invention belongs to the technical field of automobile engineering, and particularly relates to a method for predicting the fatigue life of a wide-body mining vehicle frame. The prediction methodcomprises the following steps: 1, extracting an acceleration signal on an axle head of the wide-body mining vehicle through a test; 2, establishing a whole vehicle rigid-flexible coupling model; 3, performing virtual iteration on the acceleration signal to convert the acceleration signal into an axle shaft head displacement signal; 4, inputting the axle head displacement signal into the whole vehicle rigid-flexible coupling model, and calculating and obtianing a change curve of the load at each connection point of the vehicle frame and other structures along with time; 5, performing static simulation analysis on the frame flexible body model, namely a finite element model; and 6, inputting the S-N curve of the frame material, the frame static analysis result file and the change curve of the load of each connection point along with time into software nCode for calculation. According to the method, the dangerous position with the short fatigue life of the frame can be accurately found through simulation analysis according to the axle shaft head acceleration measured by the test, and the fatigue life of the frame of the wide-body mining vehicle is predicted.

Description

technical field [0001] The invention belongs to the technical field of automobile engineering, in particular to a method for predicting fatigue life of a frame of a wide-body mining vehicle. Background technique [0002] With the development of modern automobile technology, in addition to being a means of transportation, automobiles have also derived many other functions, such as fire trucks, aerial work vehicles, garbage sweepers, wide-body mining vehicles, etc. However, passenger cars are still directly related to the general public. Therefore, the research and development technology of passenger cars has developed more rapidly than that of other commercial vehicles, including the fatigue durability analysis of automobile structures. Fatigue damage is the damage phenomenon that occurs when a mechanical structure is subjected to alternating loads that are much smaller than the ultimate strength of the material itself. As the matrix of the entire vehicle, the frame bears va...

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Application Information

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IPC IPC(8): G06F30/23G06F119/04G06F119/14
CPCY02T90/00
Inventor 赵北卢少勇赵峻枫武橦
Owner SANY HEAVY EQUIP
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