Design, Modeling and Performance Testing of Two-axis Force Sensor with Flexible Parallel Structure

doi:10.3901/JME.2025.12.039

Abstract

Abstract: Aiming at the problems of cross-coupling crosstalk and difficulty in combined calibration of multiple loads for multi-axis force sensors, based on the traditional parallel mechanism and configuration evolution design method, a new two-axis force sensor with decoupled configuration that can meet the measuring requirements of two planar force components is proposed, and the optimal bridge-connection scheme is determined. Utilizing the linear elastic-beam theory and modular modeling method, the strain analytical model between output strain of two bridges for the presented sensor and measured loads is constructed with the overall stiffness as the bridge. The correctness of the analytical model is verified with the finite element analysis and calibration experiments. The single-axis static-load performance testing and two-dimensional combined calibrations are performed with the sensor calibration system. The results show that the designed sensor has higher measurement accuracy and smaller cross coupling. Meanwhile, the linear-decoupling matrix obtained with the least-square linear fitting can achieve high-precision prediction for two measured loads, which provides the important support for the decoupling design of multi-axis force sensors and linear high-precision decoupling.

Key words: two-axis force sensor, strain analysis, combined calibration, performance testing, linear decoupling

CLC Number:

TP212

LI Lijian, SHEN Ning, SUN Li, YAO Jiantao, WU Tingting. Design, Modeling and Performance Testing of Two-axis Force Sensor with Flexible Parallel Structure[J]. Journal of Mechanical Engineering, 2025, 61(12): 39-49.

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