专用传感器动态测试下电信号的数值模拟研究

专用设备转子振动测试中,电涡流传感器采用“静态标定、动态使用”的方法,即在静态下标定电涡流传感器,获得灵敏度,直接用于动态下转子的振动测试,并未考虑旋转载荷对CFRP转子导电性的影响。因此,这种方法无法准确测试得到旋转载荷下的转子振动。针对这一问题,本文开展旋转载荷对电涡流法测试CFRP转子振动的影响研究,建立了电涡流传感器的有限元模型,完成了CFRP导电性的数值模拟计算;通过数值模拟,完成了CFRP层厚度以及传感器探头与CFRP层间距对磁感应强度分布的影响分析,揭示了不同参数对导电性的影响规律。

In the rotor vibration test of special equipment, the eddy current sensor adopts the method of "static calibration, dynamic use", that is, the eddycurrent sensor is calibrated under static to obtain sensitivity, and it is directly used for the vibration test of the dynamic rotor, without consideringthe influence of rotational load on the conductivity of the CFRP rotor. Therefore, this method cannot accurately measure the rotor vibrationunder the obtained rotational load. In order to solve this problem, the influence of rotational load on the vibration of CFRP rotor tested byeddy current method is studied, the finite element model of the eddy current sensor is established, and the numerical simulation calculation ofCFRP conductivity is completed. Through numerical simulation, the influence of the thickness of the CFRP layer and the distance between thesensor probe and the CFRP layer on the magnetic induction intensity distribution was analyzed, and the influence of different parameters on theconductivity was revealed.