新型应变式三向力传感器的标定和验证

The Calibration and Verification of the New Three-Directional Strain Gauge Force Transducer

摘要: 应变式力传感器广泛应用于医学、计算机、加工业等领域，但是在土建领域特别是工程结构试验方面，由于误差性耦合与结构性耦合的存在，严重影响了其测量功能和测量精度，使得很多试验得不到所需目标数据，影响了工程结构试验研究的进展，也限制了其更广泛的实际应用。基于此，本文首先介绍国产应变式力传感器的特点和应用现状，然后提出一种新的应变式力传感器，可以通过其标定试验获得的传递系数得到目标内力(轴力、剪力和弯矩)，并在一座大比例尺的梁桥振动台试验中进行实际验证，将其测量结果与传统的应变片的测量结果进行比较，误差约为10%，验证了其测量方法的有效性和准确性。

Abstract: Strain gauge force transducer is widely used in many fields, such as medicine, computer technology, manufacturing and so on. But in civil engineering, especially engineering structure tests, because of the existence of error coupling and structural coupling, the measuring function and precision of the force transducer are seriously affected, causing many tests fail to get the required target data. And this definitely affects the progress of the tests and limits the wider practical application of the transducer. In this paper, the characteristics and application of the homemade force transducer are introduced. Next, a new strain gauge force transducer is proposed, which can measure the target forces (axial force, shear force, bending moment and torque) by the coefficients obtained from the calibration test. Then its verification in a large-scale shaking table test of a beam bridge is explained and the measuring results of this new force transducer are compared with the strain gauge. Finally, the validity and accuracy of its measuring method are verified because the error is only around 10%.