Airocraft Research on Thermal Vibration Test of Typical Rudder Structure

doi:10.12382/bgxb.2024.0865

Abstract

Abstract:

In response to the complex and variable dynamic response of aircraft control surfaces in hot environments,a typical control surface structure is studied. A heating vibration test platform for a typical control surface structure is designed and built for thermal vibration tests on the control surface under different thermal environments in order to obtain the transfer function of the structure under different thermal environments.The research results indicate that the test bench can provide relatively uniform heating on both sides of typical rudder structure,and restore the response characteristics of the structure during real flight by applying external loads through a vibration table.The experimental results indicate that the test method can be used for the combined thermal-vibration tests on aircraft at temperatures ranging from 20℃ to 600℃.The test method provides important engineering significance for the study of aircraft thermal-vibrationtests.

Key words: airocraft, control surface structure, thermal vibration response, thermal modal, quartz lamp heating

WANG Pengfei, LIU Zhen, ZHOU Changwei, DANG Tianjiao. Airocraft Research on Thermal Vibration Test of Typical Rudder Structure[J]. Acta Armamentarii, 2024, 45(S2): 170-175.

Figures/Tables 11

Fig.1 Heating principle diagram of quartz lamp for thermal test

Fig.2 Schematic diagram of FEM and experimental model

Fig.3 Flow chart of FEM correction of test piece structure

Fig.4 Diagram of FEM(left )and experimental modes(right)

Table 1 Modal test results of test specimens after modal correction

阶数	试验模态频率/Hz	有限元模态频率/Hz	MAC值	频率偏差/%
1	185	183.4	0.94	0.9
2	226.7	233	0.97	2.8
3	350.6	338.9	0.90	3.3
4	513.6	484.3	0.82	5.7

Fig.5 Control surface system with water cooling device

Table 2 Modal test results after correction of water cooling device

阶数	试验模态频率/Hz	有限元模态频率/Hz	MAC值	频率偏差 (%)
1	176.5	181.3	0.978	2.7
2	328.8	336.19	0.974	2.2
3	515.3	500.24	0.973	2.9
4	630.8	627.41	0.954	0.5

Fig.6 Schematic diagram of thermal-vibration test

Fig.7 Distribution of temperature test points for rudder structure

Fig.8 Transfer functions of acceleration measurement points 1-4 at different temperatures

Table 3 Modal frequencies of rudder structures at different temperatures Hz

模态阶数	200℃	300℃	400℃	500℃	600℃
1	169.7	167.6	165.5	162.8	159.9
2	322.9	318.7	314.4	309.4	303.7
3	499.4	492.3	484.9	476.4	466.1
4	596.3	587.1	577.9	567.1	555.6
5	1061.8	1054.3	1041.1	1034.7	1022.2
6	1307.5	1289.7	1266.5	1241.4	1215.8
7	1364.9	1349.2	1322.6	1315.8	1301.6

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