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Dynamic measurement on infiltration process and formation mechanism of infiltration front
An infiltration measurement device was developed to research the infiltration process of molten AZ91D magnesium alloy into the Al2O3 short fibre preform. The variation of relationship between the heights of measuring points and the time for molten alloy to reach the measuring points was illustrated. The effect of infiltration process parameters on the infiltration front was analyzed. It is found that pressure and pouring temperature are the most important factors which affect the infiltration velocity and composite quality. Furthermore, considering the influence of temperature field, an infiltration model of molten AZ91D into the short fibre preform was constructed on the basis of experimental results and Darcy's Law. The analysis shows that the results predicted by this model are consistent with the experimental results....
2020-11-22 17:58:37浏览：31
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ACTIVE FRONT STEERING DURING BRAKING PROCESS
An active front steering (AFS) intervention control during braking for vehicle stability is presented. Based on the investigation of AFS mechanism, a simplified model of steering system is established and integrated with vehicle model. Then the AFS control on vehicle handling dynamics during braking is designed. Due to the difficulties associated with the sideslip angle measurement of vehicle, a state observer is designed to provide real time estimation. Thereafter, the controller with the feedback of both sideslip and yaw angle is implemented. To evaluate the system control, the proposed AFS controlled vehicle has been tested in the Hardware-in-the-loop-simulation (HILS) system and compared with that of conventional vehicle. Results show that AFS can improve vehicle lateral stability effectively without reducing the braking performance....
2020-11-10 09:33:08浏览：21
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