Thermo-modal test on an axle bearing supported rudder and identification of its supporting stiffness

TANG Xiaofeng; HE Zhenwei; CHANG Hongzhen; SHI Xiaoming; PAN Qiang; TANG Guoan

doi:10.7527/S1000-6893.2018.22617

ACTA AERONAUTICAET ASTRONAUTICA SINICA >

2019 , Vol. 40 >Issue 6: 222617 - 222617

DOI: https://doi.org/10.7527/S1000-6893.2018.22617

Solid Mechanics and Vehicle Conceptual Design

Thermo-modal test on an axle bearing supported rudder and identification of its supporting stiffness

TANG Xiaofeng ,
HE Zhenwei ,
CHANG Hongzhen ,
SHI Xiaoming ,
PAN Qiang ,
TANG Guoan

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1. Department of Aeronautics and Astronautics, Fudan University, Shanghai 200433, China;
2. Shanghai Electro-Mechanical Engineering Institute, Shanghai 201109, China;
3. Beijing Institute of Structure and Environment Engineering, Beijing 100076, China;
4. Shanghai Aerospace Control Technology Institute, Shanghai 201109, China

Received date: 2018-08-20

Revised date: 2018-10-08

Online published: 2018-11-20

Supported by

Innovation Foundation of Shanghai Aerospace Science and Technology (SAST201605)

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Abstract

When hypersonic vehicles fly in atmosphere and near space for a long time, the modal characteristics of their rudders are different from their fixed wings. They are not only taking effects of the elastic module and inner thermal stress of themselves, but also taking effects of the supporting stiffness near the rudder spindles, and the supporting stiffness are also under the influence of temperatures. A rudder supported by axle bearing is studied, and the effects of temperature on supporting stiffness are taking into account. Instead of adopting fixed boundary condition at the root of the rudder, a full motion rudder supporting boundary condition is setup. A heating test case is designed, in which the rudder has the same heating condition as the previous test, but the supporting area is different. A linear relationship is obtained, showing how the temperatures rising at the two sides of the spindle have effects on supporting stiffness of the rudder. In the second test case, the identification of the linear relationship is verified as effective. With the same heating condition of the rudder, reducing the temperature of the supporting area will effectively mitigate the influence of aerodynamic heating on modal frequencies of rudder, which can be referred to by the thermal protection design of vehicle with such a rudder. Some suggestions are given for the thermal protection design for vehicles with such rudders.

Key words： supporting stiffness; rudder; simulation device of aerodynamic heating; laser vibration measurement; thermo-modal

Cite this article

TANG Xiaofeng , HE Zhenwei , CHANG Hongzhen , SHI Xiaoming , PAN Qiang , TANG Guoan . Thermo-modal test on an axle bearing supported rudder and identification of its supporting stiffness[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2019 , 40(6) : 222617 -222617 . DOI: 10.7527/S1000-6893.2018.22617

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