基于能量算子解调法的轴系扭振的测量

M easurement of shafting torsional vibration based on energy operator demodulation methodLiu Baohua ，Pang Hongzhong ，Yang Kai(1.School ofAutomation Science and Electrical Engineering，Beihang University，Beijing 100191，China；2.Parallel Robot and Mechatronic System Laboratory，Yanshan University，Qinhuangdao，Hebei 066004，China)Abstract：Shafting torsional vibration can be regarded as a torsional vibration signal modulating the phase of the uniform rotationshaft，SO phase demodulation of the vibration signal collected from the rotating shaft can get the torsional vibration signa1.W e usethe energy operator method to demodulate the phase and frequency of the shafting vibration signal based on Hilbert transformprinciple used in the measurement of shafting torsional vibration，which not only separates the torsional vibration signal and in-stantaneous shock process accurately，but also generates very small errors.The simulation experiment shows that this methodhas good performance in the separation and measurement。

Key words：torsional vibration；phase demodulation；Hilbert transform ；energy operator在旋转机械中，传动轴系可能会因机械、电气、动力或负荷等方面的原因，转矩会发生短暂持续的变动或振荡，从而使旋转轴系产生扭转振动(简称扭振)。扭振具有复杂的机电表现形式和很强的隐蔽性，会严重危害轴系的安全，而