基于单点脉冲宽度法的转子轴向位移径向测量

Radial Measurement of Rotor Axial Displacement Based on Single Pulse Width Method

针对当前转子轴向位移径向测量方法中存在改变轴系结构、传感器安装调试复杂等问题,提出了一种基于单点脉冲宽度变化的转子轴向位移径向测量方法。该方法利用光学色标传感器实时监测粘贴在轴系表面的三角形条码得到轴向位移前后脉冲宽度变化,并结合条码几何尺寸及转子运行参数计算获得转子轴向位移。首先,推导了脉冲宽度法轴向位移测试的基本原理,通过建立考虑轮廓误差的三角形条码轴向位移与脉冲宽度计算模型;其次,分析了条码结构参数及转子工况条件对测试结果的影响规律;最后,通过搭建气浮支撑的精密转子轴承系统测试平台,实验验证该方法的有效性。结果表明:测量误差受条码倾斜角度影响较大,转子直径较大时可以通过增加条码宽度减少条码数量的方法保证测量精度。本方法在不改变轴系结构的条件下,为转子轴向位移的径向监测提供了一种简单易行的新思路。

The radial measurement method of the axial displacement of the rotor often suffers the changing shafting structure and the complicated installation and debugging of the rotor. In light of this problem a measurement method based on the single point pulse width variation is proposed. The axial displacement of the rotor is calculated by the bar code geometry,rotor operating parameters and the pulse width before and after the axial displacement of the rotor is measured by the optical color-coded sensor. First,the basic principle of measuring axial displacement by radial pulse width method is derived. The axial displacement and pulse width calculation model of the triangle print bar code considering the contour error is established. Then,the influence of the bar code structure parameters and the rotor condition conditions on the test results is analyzed. Finally,the effectiveness of the method is verified by the test platform of the precision rotor bearing system with air bearing support. The results show that the measurement error is greatly affected by the tilt angle of the bar code. When the rotor diameter is large,the method maintains the accuracy by increasing the bar code width and reducing the number of bar codes. The method provides a simple and easy new idea for the radial monitoring of the axial displacement of the rotor without changing the shafting structure.