一种结构解耦的新型应变式三维力传感器研究

维间耦合一直是制约多维力传感器精度提高的重要因素,结构解耦也一直是多维力传感器追求的目标。提出了一种新型三维力传感器,可用于Fx、Fz、My3个维度广义力的测量,其敏感原理是结构解耦的,因此可具有更高的精度。介绍了这种新型三维力传感器的结构并分析其敏感原理。采用有限单元法对应变式三维力传感器进行结构静力仿真,利用ANSYS后处理器提供的路径映射技术,精确地获得了应变片的贴片区域。仿真结果表明,该新型传感器与目前的应变式多维力传感器相比,维间耦合误差有明显改善,维间干扰由传统结构的3.56%降低至0.40%。

Study on a New Type of Adopted Structure Three Dimensions Strain Gauge Force Sensor

The coupling error of directions has been the important factor of restricting the improving of the accuracy of multi-dimensional force sensor. Decoupling structure has been also a goal of multi-axis force sensor. This paper presents a new type of three-dimensional force sensor. It can be used for measuring three-dimensional forces Fx,Fz and My, sensitive principle is structure decoupling, therefore expected to have higher accuracy. First, this paper discusses the three-dimensional force sensor structure and the sensitive principle. Secondly, the finite element method for three-dimensional strain gauge force sensor structure is adopted in static analysis. Using the path mapping technology provided by the processor, the strain gage placement area is accurately obtained. The simulation results show that, compared with the cross beam structure of traditional multi-dimensional force sensor, the coupling error of directions has improved significantly, dimensional interference decreases from the traditional structure of 3.56% to 0.4%.