某型滑油冷却风扇振动特性分析

为避免工作状态下风扇转子由于自身工作转速及相关的激振频率引起的共振现象,通过试验模态分析及数值模态分析结合的方法对转子振动特性进行分析,并与改进前的转子进行对比。结果表明,以静子尾流产生的激振力对应的共振转速与转子的工作转速相接近,改进后的转子各阶固有频率提升但共振裕度减小,因此在风扇使用过程中应保证其完整性,从而避免疲劳断裂等安全隐患。

Vibration Characteristics Analysis of a Lube Cooling Fan

In order to avoid the resonance caused by the working speed of the rotor and relevant excitation frequency, the vibration characteristics of the rotor are analyzed by the combination of the experimental and the numerical modal analysis. The rotor before improved is compared with the current one. The results show that the working speed is close to the resonant speed which corresponds to the oscillating force generated by the stator. Each stages of natural frequency increases while the margin of resonance decreases compared to the former rotor. As to avoid the security risks, such as fatigue fracture, the integrity of the fan should be ensured during its working.