Investigation of wind tunnel balance dynamic characteristics' multi-order inertial compensation

Ai Di; Xu Xiaobin; Wang Xiong

doi:10.11729/syltlx20170161

Volume 32 Issue 4

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Journal of Experiments in Fluid Mechanics > 2018 > 32(4): 87-92. > DOI: 10.11729/syltlx20170161

Ai Di, Xu Xiaobin, Wang Xiong. Investigation of wind tunnel balance dynamic characteristics' multi-order inertial compensation[J]. Journal of Experiments in Fluid Mechanics, 2018, 32(4): 87-92. DOI: 10.11729/syltlx20170161

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Investigation of wind tunnel balance dynamic characteristics' multi-order inertial compensation

Ai Di^{1, 2, ,},
Xu Xiaobin¹,
Wang Xiong¹

1.
China Aerodynamics Research and Development Center, Mianyang Sichuan 621000, China
2.
Science and Technology on Scramjet Laboratory, China Aerodynamics Research and Development Center, Mianyang Sichuan 621000, China

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Received Date: December 20, 2017
Revised Date: March 29, 2018

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Abstract

Abstract

The structural vibration of the aerodynamic measurement system can be actuated by impulse loads or dynamic loads in aerodynamic measurement tests of hypersonic wind tunnels. Therefore, the useful data and the vibration noise are mingled. The accuracy of the present balance dynamic compensation method is poor since the processing method is over simplified. We simplify the force measurement system to a cantilever beam with an end mass determined by its structural characteristics, and obtain its analytical solutions for free vibration. Study of the free vibration is focused on the impacts of different vibration shapes on force measurement, and the distribution disciplines of acceleration of different vibration shapes. We put forward a new compensation method named 'multi-order inertial compensation method', and obtain the corresponding theoretical compensation coefficients. What's more, we validate this method by finite element analysis and wavelet analysis. The results show that the multi-order inertial compensation method significantly improves the dynamic characteristics of the balance compared with conventional method.
- wind tunnel balance,
- dynamic characteristics,
- inertial compensation,
- aerodynamic force measurement

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