基于电磁感应的扭转振动测量方法

设计了一种基于电磁感应效应的转子扭转振动测量方法.该方法的思路是使线圈与永磁体做相对运动,根据线圈切割磁感应线的速度与感应电动势正相关的原理,由线圈两端的电压变化量计算各点的瞬时速度变化量,进而积分求出扭振信息.算法上采用半周期插值以及与标准信号进行对应点比较,保证了瞬时速度变化量的精确度.装置设计方面通过适当的空间布局,在一定程度上消除了轴向振动和部分横振的影响.实测验证表明,该方法得出了与输入载荷一致的扭振信息,具有精确性良好,安装简易,操作方便的特点.

A Method of Torsional Vibration Measurement Based on Electromagnetic Induction

This paper presents a new method of rotor torsional vibration measurement based on electromagnetic induction effect. The train of thought of this method is the relative movement between coil and permanent magnet. When coil cuts magnetic induction lines, the electromotive force is generated, and the voltage is proportional to relative velocity. Based on above principle, the change of instantaneous velocity can be calculated by corresponding voltage change at both ends of the coil, thus the torsional vibration is obtained by integral. The semi-cycle interpolation and comparison of the voltage at corresponding points with that of standard signal, accuracy of instantaneous velocity is highly ensured. In device designing, the effects of axis vibration and part of transverse vibration are eliminated at a certain extent through an appropriate measuring layout. Test verification shows that torsional vibration acquired by this method is consistent with the input loads, and this method has features of good accuracy, simple installation, user-friendly operation.