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用测试扭振信号来分析轴系的各谐次幅值特性 ,研究扭转共振是解决由扭振产生故障问题的有效方法之一。针对发动机升降速过程扭振信号是瞬态时变信号 ,并存在低频滚振干扰 ,不能采用转速跟踪分析方法直接进行分析的特点 ,提出了将一次采样样本所包含的整周期数扩大一倍 ,加 Hanning窗进行转速跟踪分析的方法 ,消除了低频滚振的影响 ,大大提高了升降速过程扭振各谐次幅值分析精度。这种方法既能在试验台上测试分析发动机的扭振特性 ,也能测试汽车或船舶行驶或加速过程中的扭振特性。仿真和试验证明 ,除所分析的第一谐次幅值有较大的误差外 ,其余谐次幅值精度都很高 ,且大大提高了测试分析速度
It is one of the effective methods to solve the problem caused by torsional vibration by analyzing torsional vibration signal to analyze the amplitude characteristics of each harmonic of shaft system. In view of the characteristic that the torsional vibration signal is a transient and time-varying signal in the process of raising and lowering speed of the engine, and there is low-frequency rolling disturbance, it can not be directly analyzed by the rotational speed analysis method. It is proposed to double the number of whole cycles contained in a sample, Plus Hanning window speed tracking analysis method, eliminating the impact of low frequency roll vibration, greatly improving the speed of the rise and fall of each harmonic amplitude harmonic analysis accuracy. This method can test and analyze the torsional vibration characteristics of the engine on the test rig as well as the torsional vibration characteristics during the driving or acceleration of a car or a ship. Simulations and experiments show that, except for the large error of the first harmonic amplitude analyzed, the remaining harmonic amplitude precision is very high, and the test analysis speed is greatly increased