光纤干涉式振动传感器中顺变柱体刚度系数的计算方法

Calculation Method for Stiffness Coefficient of Compliant Cylinder in Fiber-Optic Interferometric Vibration Sensor

从能量分配角度分析了光纤干涉式顺变柱体传感器的工作原理,给出了复合顺变柱体的等效刚度系数计算公式。采用有限元分析方法对复合顺变柱体进行固有频率的仿真,并得出光纤缠绕起始位置应该距离中间惯性振子5mm的结论;实验采用固有频率测量的方法间接计算顺变柱体的等效刚度系数,对三个顺变柱体传感器进行的测量实验结果表明,该方法可作为顺变柱体复合刚度系数计算的依据。

In this paper, the principle of fiber-optic interferometric compliant cylinder sensor is analyzed from the perspective of energy distribution, and the compound compliant cylinder calculation formula of the equivalent stiffness coefficient is given. Finite element analysis method is used to simulate the natural frequency of the compound compliant cylinder, and the simulation resutts show that the distance from wrapped position of the fiber optic to the intermediate inertia oscillator should be 5 mm. In the experiment, the natural frequency measurement method is used to indirectly calculate the equivalent compliant cylinder stiffness coefficient. The experimental results from the measurement of three different compliant cylinder sensors show that the proposed method can be used as the basis of the calculation of the compliant stiffness coefficient.