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Li G.,Hunan University | Gu Z.,Hunan University | Gu Z.,Hunan University of Technology | Zhang S.,Hunan University | And 3 more authors.
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2015

Combining the non-equidistant grey model with traditional Miner rule, a method was proposed to predict the fatigue life of structural components. Firstly, in the case of non-equidistant stress grading statistics, non-equidistant grey model was constructed, and genetic algorithm was used to optimize the values of background value to ensure the accuracy. And, combining the non-equidistant grey model with Miner rule, grey Miner method was constructed to predict fatigue life. Then a numerical example proved the accuracy of non-equidistant grey model and the effectiveness of grey Miner method. Finally the method previously mentioned was applied to the fatigue life prediction of A-shape frame. The results show that it improves the accuracy of fatigue life prediction of A-shape frame and proves the effectiveness of the grey Miner method to predict fatigue life of components. © 2016, China Mechanical Engineering Magazine Office. All right reserved. Source


Mi C.,Hunan University | Gu Z.,Hunan University | Gu Z.,Hunan University of Technology | Liang X.,Xiangtan Electrical Manufacturing Group Heavy Duty Equipment Co. | And 2 more authors.
Qiche Gongcheng/Automotive Engineering | Year: 2011

Aiming at the problem of end cover damage caused by piston impact in the steering system of a homemade 220T motor-in-wheel mining dump truck, a 3D collision dynamics FEA model for steering system is built using FEA codes HYPERMESH and LS-DYNA, and a numerical simulation is carried out to get the stress distribution in the parts involved. Then combined with real vehicle test verification, a conclusion is drawn that the stress in cylinder side caused by piston impact is lower than that in end cover side. Accordingly, the improvement scheme is adopted of changing impact position to let piston bumps against cylinder side at the limit position of steering, so the problem of end cover damage is resolved. Source


Mi C.,Hunan University | Gu Z.,Hunan University | Gu Z.,Hunan University of Technology | Wu W.,Hunan University | And 3 more authors.
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | Year: 2012

In order to study fatigue life of rear axle housing of the first Chinese SF33900 mining dump truck, the finite element model of rear axle housing is built. Stress analysis and experimental results are compared, which finds out that the margin of error is acceptable and verifies the accuracy of the model as well. Regarding dynamics analysis results as random load of fatigue life analysis of rear axle housing, fatigue life contours are obtained under normal conditions and the minimum life meets the engineering requirement. For the purpose of studying the sensitivity between load change and fatigue life, the impact of fatigue life under amplitude changes of the three loads is contrastively analyzed, which gets that the load of rear tie rod and suspension have greater impact on fatigue life of rear axle housing. Otherwise, the change of load frequency also plays a great role in fatigue life. The results show that the change of load frequency has a greater influence on fatigue life of rear axle housing than the change of load amplitude. © 2012 Journal of Mechanical Engineering. Source


Yang Q.,Hunan University | Gu Z.,Hunan University | Gu Z.,Hunan University of Technology | Mi C.,Hunan University | And 3 more authors.
Qiche Gongcheng/Automotive Engineering | Year: 2012

For predicting the fatigue life of the frame and its welds in SF33900 mining dump truck with in-wheel motors, a FE model for the frame is established with shell elements. The stress distribution under dynamic loading is obtained by applying software Hypermesh, which is compared with that of the test, validating the correctness of the model, and based on this a multi-body dynamics model is built. According to the actual road condition for dump truck driving with C-grade road spectra as input, the time history of frame dynamic load is gained. Meanwhile, based on the S-N curve of frame material, the fatigue life of frame is got by using Msc, Fatigue, and further, a reliable fatigue life of welds is obtained by using SEAM_weld method, providing reference base for the reliability design and structure optimization of the frame. Source


Zhang L.,Hunan University | Gu Z.,Hunan University | Gu Z.,Hunan University of Technology | Li W.,Hunan University | And 2 more authors.
Qiche Gongcheng/Automotive Engineering | Year: 2011

With concurrent consideration of friction feature and modal coupling, a model for the disc brake of a mining dump truck is built based on rigid-flexible coupling for the simulation and analysis of its vibration. It is for the first time by directly setting the contact between flexible bodies to simulate the typical braking condition of disk brake and conduct its transient dynamics analysis. The results show that the friction coefficient and the damping of components have significant influence on the vibration of disk brake and appropriate component damping can effectively improve the stability of brake system. Source

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