汽车传动系统扭振问题的遗传算法优化

Optimization of Driveline Torsional Vibration Using Genetic Algorithm

某前置后驱微型客车存在中低转速下车内轰鸣声的问题,分析研究表明该轰鸣声由传动系统扭振引起。首先建立传动系统扭振当量模型并进行自由振动计算和强迫振动计算,开展传动系统扭振测试,并将仿真计算结果与试验数据进行对比,以此验证模型的准确性。然后在此模型基础上对该车型传动系扭振特性进行分析和研究,基于遗传算法对传动系扭振问题进行优化,提出两种降低扭振幅值的方案:优化传动系统关键参数;加装双质量飞轮。对优化得到的数据制作样件并进行试验验证,结果表明加装双质量飞轮方案对降低扭振幅值效果更加明显。上述工作对解决同类问题具有一定指导意义。

A rear-drive mini bus exists the booming problem at low and medium engine speed,which is demonstrated to be caused by the driveline torsional vibration. At first beginning,the torsional vibration equivalent model of the driveline was established,the free vibration calculation and forced vibration calculation were carried out. The test of driveline torsional vibration was conducted,the simulation result was compared with the test data,and the model was proven to be acceptable.Then the verified model was used to research characteristics of torsional vibration of the driveline. The torsional vibration problem was optimized based on the genetic algorithm. Two solutions were proposed to reduce the amplitude values of the torsional vibration:optimizing the key parameters of the driveline and adding dual-mass flywheel. The experimental result shows that adding dual-mass flywheel is more obvious to reduce the torsional vibration problem.This research can provide some references for solving the similar engineering problem.