1. Nanjing university of Aeronautics and Astronautics,College of Aerospace Engineering,Nanjing,Jiangsu,P. R. China,210016
2. PipeChina West East Gas Pipeline Company,Shanghai,P. R. China,200122
3. Nanjing university of Aeronautics and Astronautics,State Key Laboratory of Mechanics and Control for Aerospace Structures,Nanjing,Jiangsu,P. R. China,210016