应变式二维加速度传感器的研究与仿真

Research and simulation of strain two-dimension acceleration sensor

轴承振动二维加速度信号对其状态监测和故障诊断具有重要研究意义。采用圆柱形等截面梁为弹性元件,结合二轴应变测试方法,提出了应用于轴承状态监测与故障诊断的应变式二维加速度传感器新结构。在建立应变式传感器振动加速度方程的基础上,分析了结构参数对传感器固有频率和灵敏度的影响,并利用有限元方法对传感器的动态响应性能和测量精度进行了数字仿真分析,获得了动态响应曲线和测量精度曲线。仿真结果表明:新型应变式二维加速度传感器具有良好的测量精度和低频特性,以及维间非耦合性、结构简单、成本低廉、易于加工装配等优点。

Detection of the two-dimension（2D） acceleration signals plays an important role in bearing condition monitoring and fault diagnosis.A new structure of strain 2D acceleration sensor is proposed,which uses the cylindrical uniform cross section beam as the elastic element and based on 2D strain measurement method.The influence of structural parameters on the sensitivity and natural frequency of the sensor is analyzed based on the acceleration equation,and the dynamic response and the measurement precision of the sensor are analyzed by finite element method（FEM）.The results show the proposed sensor has high precision,low frequency characteristics.Also it benefits a lot from its characteristics of uncoupling between the dimensions,low cost,easy to manufacture and assemble.