| Popis: |
Aiming at the design challenges of multi-branch orthogonal compliant test stand, a finite element method with beam connection units is proposed, and finite element models of force branches and test stand are established using this method. Structural characteristics analysis is carried out for six branch forms and lateral layout forms. Based on this, combined with a case study of test stand, detailed parameter design is conducted using the finite element model, resulting in a compact and minimally coupled structure. Calibration tests for the three load components of the test stand (axial force, normal force, and pitching moment) are performed, with uncertainties of calibration around 0.5% of the full scale (FS). To address the significant impact of the loading accuracy of high-load test stands on calibration measurements, a performance evaluation method based on the ratio of load to measurement is proposed. Through this method, the repeatability of the three-component measurement of the designed test stand is around 0.4%FS, and the hysteresis of large-range measurement is within 0.7%FS. The research findings have quite reference significance for the structural design and performance analysis of orthogonal test stands. |
