大学生方程式赛车的发动机牵引力控制与弹射起步研究

基于使FSC赛车能有最佳起步性能表现的目的,采用调节发动机的断油或断火,控制发动机的功率输出,从而控制目标滑移率和目标转速的方法,结合在多组测试数据的多次直线加速试验,得出通过实验数据选择的最优动力方案来限制引擎的功率输出(断油或断火),可以大大提高FSC赛车的起步性能的结论。

Fault diagnosis of rocket engine ground testing bed with self-organizing maps(SOMs)

To solve the fault diagnosis problem of liquid propellant rocket engine ground testing bed,a fault diagnosis approach based on self-organizing map(SOM)is proposed.The SOM projects the multidimensional ground testing bed data into a two-dimensional map.Visualization of the SOM is used to cluster the ground testing bed data.The out map of the SOM is divided to several regions.Each region is represented for one fault mode.The fault mode of testing data is determined according to the region of their labels belonged to.The method is evaluated using the testing data of a liquid-propellant rocket engine ground testing bed with sixteen fault states.The results show that it is a reliable and effective method for fault diagnosis with good visualization property.

红旗车故障两例

故障1 一辆红旗乘用车,在110km/h的高速行驶时,方向摆头,整个前部车身左右摇晃。高于或低于此车速时,乘用车摆振不明显。这种故障属于前轮共振。它与多种因素有关,如前轮定位、车轮平衡、减振器的紧固情况和阻尼特性、减振弹簧的弹力、转向横拉杆球头和下摆臂是否松旷及前轮轴承的工作状况等。首先进行四轮动平衡检查,然后试车,发现故障现象依旧。