【摘要】 为了实现对大型旋转机械扭振的准确测量,提出了一种基于光纤布拉格光栅(Fiber Bragg Grating,FBG)应变的扭振测量方法。首先,根据旋转机械轴系的扭振产生机理以及光纤光栅传感技术,建立了扭振与光纤光栅的应变传递模型,进而设计了光纤光栅应变传感器。接着,搭建了静、动态实验平台,对该传感器进行了静、动态标定实验。最后,在机械运行状态下,对该传感器进行了动态扭振测试实验。标定实验结果表明:在线性区间内,该传感器的灵敏度为12.464με/Nm,线性相关系数为0.9987,迟滞误差为3.02%,重复性误差为1.23%;在动态响应实验中,响应时间为0.171s(±5%),超调量为67.81%。动态测试实验结果表明:该传感器能检测出与已知加载特征一致的扭振信号。因此,基本满足对扭振测量的稳定可靠、精度高、抗电磁干扰等要求。更多还原

【Abstract】 In order to achieve the accurate measurement of the torsional vibration of large rotating machinery,this paper put forward a new kind of method to measure torsional vibration based on fiber Bragg grating. First,According to the mechanism of rotating machinery shafting torsional vibration and the fiber Bragg grating sensing technology,transfer model of the torsional vibration and the fiber Bragg grating strain is established,and FBG strain sensor is designed. Then a FBG sensor experiment device is set up,its static and dynamic calibration and bending vibration compensation experiments were carried out. Finally,the experiment in the condition of rotating test has carried on. Results of the calibration show that sensitivity of the sensor in linear range is 12.464 me/Nm,the linear correlation coefficient is 0.9987,hysteresis error is 3.02%,the repeatability error is 1.23%;Response time is 0.171 s,overshoot is 67.81%.Dynamic testing experiment results show that it also can reach a same characteristics of torsional vibration signal with the known load torsional vibration signal. It can satisfy that the sensors requirements of stabilization,higher precision,as well as strong electromagnetic interference resistance and temperature insensitivity.更多还原