Study on Thermal Modal Test Method of a Wing Structure Considering Aerodynamic Heating

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Journal of Vibration and Shock ›› 2015, Vol. 34 ›› Issue (13) : 101-108.

LIU Hao LI Xiaodong YANG Wenqi SUN Xiasheng

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Abstract

It is important to investigate the thermal modal test of wing structure in the design and flight of the modern hypersonic flight vehicles. The thermal modal test system considering aerodynamic heating is founded. The temperature control parameters depended on transient temperature field calculated by numerical analysis, are used to simulate the transient thermal environment. The temperature changing with heating time is measured, that validates the precious of temperature control. The modal frequency auto-tracing method is founded by combined the intelligent PID (Proportion Integration Differentiation) control technology with the traditional phase resonance method, that expands the traditional phase resonance method into the modal parameters identification of time-dependent structural dynamics system. The modal frequency auto-tracing method has been used to measure the first four thermal modal frequencies of a triangular wing structure in a thermal modal test. The test results are well agreed with the results of numerical calculation by FEM (Finite Element Method), which indicates that the modal frequency auto-tracing method of time-dependent modal parameters identification is accurate and realizable. In addition, the identification results under uniform temperature distribution thermal structure have been measured, that are also well agreed with the results of the numerical computation. The reason of modal frequencies of time-dependent thermal structure changed with the heating time is discovered in the end of this paper, by comparing the identification results under transient temperature field with that under uniform temperature field.

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LIU Hao LI Xiaodong YANG Wenqi SUN Xiasheng . Study on Thermal Modal Test Method of a Wing Structure Considering Aerodynamic Heating[J]. Journal of Vibration and Shock, 2015, 34(13): 101-108

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