- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
- Chinese S&T Journal Citation Reports
- Chinese Science Citation Database
| Citation: | XU Bin, LIU Long, YU Shien, ZHANG Jianzhong. Dual-Parameter Compensation Method for Temperature Effects in Large-Scale Fiber Optic Balances[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20250650
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A dual-parameter compensation method based on thermo-mechanical coupling mechanisms was proposed to suppress the thermally induced drift of large-scale fiber optic balances caused by non-uniform temperature fields in long-duration wind tunnel tests and improve aerodynamic force measurement accuracy. Theoretical modeling was performed to reveal the synergistic deformation mechanism of elastic elements and floating frames under the coupling action of thermal expansion and structural constraints in non-uniform temperature fields. Constraint forces neglected by traditional models were identified as the key factor limiting compensation accuracy. Finite element simulation was adopted to analyze the differential thermal response laws of different measurement channels in uniform temperature rise and temperature difference conditions. A compensation model based on the temperature and temperature difference of symmetrically arranged elastic elements was further built, and the directly measurable dual parameters were employed to indirectly characterize internal constraint force effects. Static and dynamic temperature calibrations of fiber optic balances were conducted to obtain temperature sensitivity coefficients of each balance component, and a temperature history correction formula for elastic elements was fitted to eliminate response delay induced by thermal inertia. Thirty-second long-duration force measurement tests were conducted in a blowdown wind tunnel to validate the compensation method. Test results show that the aerodynamic force measurement errors of three measured components (axial force, normal force, and pitching moment) caused by thermal drift decrease from 18.87%, 85.37%, and 11.67% before compensation to 3.19%, 5.63%, and 1.86%, respectively. The results verify the high-accuracy compensation capability of this method under non-uniform temperature fields, providing a practically applicable temperature compensation scheme for long-duration wind tunnel force measurement tests.
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