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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2009, Vol. 10 Issue (9): 1252-1262    DOI: 10.1631/jzus.A0820621
Mechanical and Mechanics Engineering     
Effects of a flexible joint on instability of a free-free jointed bipartite beam under the follower and transversal forces
Saied IRANI, Omid KAVIANIPOUR
Department of Aerospace Engineering, K. N. Toosi University of Technology, Tehran, Iran
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Abstract  This paper deals with the problem of the instability regions of a free-free flexible jointed bipartite beam under the follower and transversal forces as a realistic simulation of a two-stage aerospace structure. The aim of this study is to analyze the effects of the characteristics of a flexible joint on the beam instability to use maximum bearable propulsion force. A parametric study is conducted to investigate the effects of the stiffness and the location of the joint on the critical follower force by the Ritz method and the Newmark method, then to research the vibrational properties of the structure. It has been shown that the nature of instability is quite unpredictable and dependent on the stiffness and the location of the joint. The increase of the follower force or the transversal force will increase the vibration of the model and consequently cause a destructive phenomenon in the control system of the aerospace structure. Furthermore, this paper introduces a new concept of the parametric approach to analyze the characteristics effects of a flexible two-stage aerospace structure joint design.

Key words： Two stage to orbit launch vehicle (TSTO LV)      Beam instability      Follower force      Ritz’s method      Newmark’s method     
Received: 07 August 2008     
CLC:  O34  
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Saied IRANI
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Saied IRANI, Omid KAVIANIPOUR. Effects of a flexible joint on instability of a free-free jointed bipartite beam under the follower and transversal forces. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2009, 10(9): 1252-1262.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.A0820621     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2009/V10/I9/1252

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