Xiangtan Electrical Manufacturing Group Heavy Duty Equipment Co.

Xiangtan, China

Xiangtan Electrical Manufacturing Group Heavy Duty Equipment Co.

Xiangtan, China

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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.


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.


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 optimize mining dump truck ride comfort for bad driving traffic, nonlinear stiffness and damping characteristics of hydro-pneumatic suspension are needed. Time-varying stiffness and damping with linear combination under a series scaling function is scattered, based on Daubechies wavelet's compactness and regularization and least-square method. This means to turn "black problem" of identifying time-varying parameters into identifying invariant coefficients when the scaling function sequence and the input and output of system are known. The multi-rigid body dynamic model of whole truck is built in Adams/view for the sake of testing stiffness and damping of identifying. Time-acceleration and power spectral density under identifying parameter are found to be extremely close to the result of experiment, which implies validity of this method. The physical parameters of hydro-pneumatic suspension by genetic algorithm is optimized, which makes the identifying parameter as the initial condition and makes the root mean square value of the seat acceleration as optimization objective. After optimizing, the value is descended by 51.84%, which achieves the purpose of improving the ride comfort. © 2012 Journal of Mechanical Engineering.


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.


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.


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.


Lu S.,Hunan University | Gu Z.,Hunan University | Wu W.,Hunan University | Liang X.,Xiangtan Electrical Manufacturing Group Heavy duty Equipment Co. | Peng G.,Xiangtan Electrical Manufacturing Group Heavy duty Equipment Co.
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | Year: 2013

Based on the fact that the cab man-machine comfort only considers the factors of joint angle, and joint torque during operation is not negligible, the cab layout was optimized based on both joint angle and joint torque. Taking the joystick as an example, the maximal joint torque was exerted during driving. According to Kane equation and NASA strength model, joint torque during pushing and pulling the joystick was acquired through establishing the dynamics model for upper limb, in which the factor of joint torque was taken into account. At the same time it checked the optimization model with dynamics simulation software SimMechanics. The results show that the optimal operating postures and corresponding comfort curves can be obtained, theoretical basis for joystick layout of mining dump truck is provided, and the optimization model can also be applied in other operating components of the cab. This new method can be used to evaluate human-machine comfort of cab operating and control interfaces and optimize the design of cab layout.


Zeng J.,Hunan University | Gu Z.,Hunan University | Li W.,Hunan University | Liang X.,Xiangtan Electrical Manufacturing Group Heavy Duty Equipment Co. | Peng G.,Xiangtan Electrical Manufacturing Group Heavy Duty Equipment Co.
Qiche Gongcheng/Automotive Engineering | Year: 2010

For further meeting the requirements of vehicle ride comfort, a fuzzy PID controller for semi-active suspension is designed and the genetic algorithm is used to optimize the quantified factors of the fuzzy controller and the three proportional factors of PID. The adjusting coefficients of PID parameters are calculated with fuzzy reasoning method to realize the control of semi-active suspension. The results of simulation on a car dynamic model demonstrate that the fuzzy PID control can effectively improve the ride comfort and handling stability of vehicle.


Liu S.-S.,Hunan University | Gu Z.-Q.,Hunan University | Wu W.-G.,Hunan University | Mi C.-J.,Hunan University | And 2 more authors.
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | Year: 2012

The full vehicle dynamics virtual prototype which included 7 subsystems was established to simulate using ADAMS/CAR, with the best match between handling stability and the ride comfort performance of the car as the object, taking the stiffness and damping of the suspension, the torsion stiffness of anti-roll bar as the optimization variables. According to the Chinese automotive industry standard QC/T 480-1999 and GB/T 4970-2006, it built the corresponding mathematic model of collaborative optimization which used the total score of the comprehensive evaluation indexes include of the four closed-loop handling stability and ride comfort evaluation of random road as the objective function, used the maximum or the minimum score as a constraint function. Then 59 groups test was designed using central composite test method and the total score was estimated by using response surface methodology (RSM). Optimization result of design factors shows that the total score of the full vehicle improves by 13%, and handling stability and the ride comfort performance both are improved.

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