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Chen K.,Chongqing University of Technology | Peng C.Y.,Chongqing University of Technology | Zhou T.,Chongqing University of Technology | Li B.B.,Chongqing Jianshe Motorcycle Co.
Advanced Materials Research | Year: 2011

Blank holder force of box deep drawing is studied changes with time and displacement by DYNAFORM numerical simulation software. The results shows that, when the straight edge part of the blank holder force is constant, rounded part adopts small blank holder force can significantly improve the forming limit of box deep drawing, but the wrinkle is still evident. If the straight edge and rounded part of the blank holder force changes with time, not only deep drawing limit increase, wrinkles are also significantly reduced, indicating that the forming limit of the box shaped part is more effective on the blank holder force changes over time than with the position variation. © (2011) Trans Tech Publications.


Chen K.,Chongqing University of Technology | Peng C.,Chongqing University of Technology | Li B.,Chongqing Jianshe Motorcycle Co. | Liu H.,Chongqing University of Technology
Advanced Materials Research | Year: 2012

Formability of the corner in the deep drawing of box-shaped parts was studied. The forming of box-shaped parts was simulated through numerical simulation software DYNAFORM from the different die radius size of shoulders and corners, the different BHF of straight and curved edges and different materials, etc. The results shows that, the forming limit height of box-shaped parts increases with the larger the die radius of shoulders and corners, and forming limit height of SS304 in the materials studied is the highest, because it has larger yield strength; If the BHF of straight and curved edges has the constant size, the forming limit height of box-shaped parts will be lower when the BHF increases, while forming limit has a clear upward trend as blank holder force increases in the deep drawing processes which accords with the change law of resistance during the dislocation movement. © (2012) Trans Tech Publications, Switzerland.


Zou X.-H.,Chongqing University of Technology | Zou X.-H.,Chongqing Jianshe Motorcycle Co. | Xiong F.,Chongqing University of Technology | Yu Y.,Chongqing Academy of Science and Technology | Wang R.-L.,General Motors
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2014

To achieve comprehensive indoor assessment of motorcycle frame fatigue reliability under impact of moving load on real roads, an acquisition method of road load spectrum based on a finite element analysis of a frame was established, and the collection and analysis of road load spectra were then completed. A multi-axial and multi-channel road simulation tests platform for motorcycle frame test was designed and built, based on the analysis of practical driving load of motorcycle frames, combining with the remote parametric control (RPC) technology and the American MTS hydraulic servo actuator and control system. An iterative method of simulating road load spectrum with force-displacement mixed control was put forward. Applying the collected road load spectra of motorcycle frames and adopting a loading control mode, mixing the force loading control and inertial loading control, the road load spectrum of motorcycle frames was efficiently and accurately simulated indoor. A multi-axial and multi-channel road simulation test method for motorcycle frames was established, an effective indoor method for fatigue reliability assessment of motorcycle frames was provided.


Xu Z.-M.,Chongqing University | Yang J.-G.,Chongqing University | Zhang Z.-F.,Chongqing University | Li S.-S.,Chongqing University | Li X.-L.,Chongqing Jianshe Motorcycle Co.
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2013

A rider-motorcycle system model was established with the motorcycle dynamic analysis software BikeSim, the pitch angle under accelerating-braking condition and the ride comfort under grade B road stochastic excitation were simulated. The maximum pitch angle under accerating-braking condition and the pitching and vertical vibration acceleration RMS values under grade B road stochastic excitation were taken as optimization objectives, and the suspension property parameters as design variables, the parallel computing tasks were built using iSIGHT to drive BikeSim and MATLAB, the multi-objective optimization was performed for a motorcycle suspension system. A method to find the goal weights was proposed according to Pareto frontier, and the optimal solution was obtained. The optimal results showed that the maximum pitch angle under accelerating-braking condition decreases and the ride comfort under grade B road stochastic excitation is improved.


Zou X.,Chongqing University of Technology | Zou X.,Chongqing Jianshe Motorcycle Co. | Xiong F.,Chongqing University of Technology | Yuan D.,Chongqing University of Technology | Yi P.,Chongqing Academy of Science and Technology
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2014

Motorcycle frame is the key load-bearing part of vehicle, its fatigue reliability, stiffness, strength, quality and other factors play a decisive role in vehicle's control stability and occupant comfort. New frame products must pass the reliability test before put into market. However, current frame fatigue reliability tests mainly use road test and testing ground test, which are time-energy consuming and the results are easily affected by environmental factors; Indoor bench tests at present mainly use single axial single incentive or single axial multi incentive mode. The motorcycle frame installation and constraints on the vehicle are very complex, the actual driving loads are complicated and changeable, thus multi-axial loads on motorcycle frame due to road excitation during actual driving could not be simulated or simulation precision is low, prone to over or under test. While the computer simulation technology development provides a new solution to dynamic performance analysis and fatigue reliability evaluation of vehicles and their parts, which including complete 3D entity model building online, creating a virtual laboratory, a virtual running environment and realizing virtual test and evaluation. For accurate and efficient analysis and evaluation of motorcycle frame fatigue reliability, a multi-axes road simulation test method for motorcycle frame based on time-frequency domain error weighting and force-displacement hybrid control was put forward. A motorcycle frame multi-axes road simulation test bench was built with American MTS road simulation test device, which was arranged with two actuator input channels in horizontal axial and vertical axial. As the motorcycle frame multi-axes road simulation test system is a multiple input multiple output system, the remote parameter matrix control strategy was applied to iterate and reproduce actual driving load spectrum. As the frame front fork and shock absorber were substituted by rigid frame fixture, in the horizontal direction, the frame dynamic response was more effective to the force loading, so the horizontal actuator used force control mode and loaded force spectrum. In the vertical direction, the system used inertial loading and frame dynamic response was more effective to displacement loading, so the vertical actuator was selected displacement control mode and loaded displacement spectrum. The motorcycle frame actual road load spectra were collected and multi-axes road simulation test bench was developed. With the simulation test bench, the multi-axes road simulation test was conducted based on force-displacement hybrid control under time and frequency domain with error weighting coefficient of 0.5. The simulation iteration precision of frame actual road load spectrum achieved 93%. Therefore the multi-axes road simulation excitation spectrum were extracted. The HYPERWORKS and ADAMS were applied in building the virtual rigid-flexible coupled multi-axes road simulation test platform with reference of the actual motorcycle frame multi-axes road simulation test system. Simulation analysis was conducted with the multi-axes road simulation excitation spectrum as input and the outcomes were verified by actual multi-axes road simulation test, thus the virtual test method for motorcycle frame based on multi-axes road simulation excitation spectrum were established. The results show that, the curve trend and amplitude of simulation results coincide well with test results in time and frequency domain, only slight amplitude deviation exists near frequency value 13 and 24 Hz, while the frequency curve RMS error is within 10%. Thus the virtual test method based on multi-axes road simulation excitation spectrum could be well applied to motorcycle frame fatigue reliability assessment.

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