Rigid-Flexible Coupling Dynamic Analysis of Sub-Launched Vehicle During the Vertical Tube-Exit Stage  

作　　者：Weiyao Zhang Jingbo Gao Cong Wang 

机构地区：[1]School of Astronautics,Harbin Institute of Technology

出　　处：《Journal of Harbin Institute of Technology(New Series)》2015年第2期26-33,共8页哈尔滨工业大学学报（英文版）

摘　　要：During the launching stage,hydrodynamic pressure and adapters' reaction loads can influence the vehicle's rigid motion as well as cause its structural vibration,which is a typical rigid-flexible coupling dynamic problem. This paper presents a 2-D rigid-flexible coupling model to calculate the vehicle's dynamic responses in that period.The vehicle was equivalent to a flexure beam with axial deformation. Hybrid coordinate and modal superposition methods were used to describe its large rigid displacement and small deformation. By the second Lagrange equation,the vehicle centroid's displacements,rotational angle and modal coordinates were chosen as generalized coordinates and then the vehicle 's rigid-flexible coupling dynamic equations were obtained. By numerical simulation,the results of vehicle's motion parameters and transverse internal loads were acquired.The calculation results showed that differences of the vehicle's motion parameters between the rigid-flexible coupling model and the rigid body assumption are noticeable and the peak magnitude of the vehicle's transverse internal loads in the rigid-flexible coupling model is higher remarkably than that in the rigid body assumption.During the launching stage, hydrodynamic pressure and adapters＇ reaction loads can influence the vehicle＇ s rigid motion as well as cause its structural vibration, which is a typical rigid-flexible coupling dynamic problem. This paper presents a 2-D rigid-flexible coupling model to calculate the vehicle＇ s dynamic responses in that period.The vehicle was equivalent to a flexure beam with axial deformation. Hybrid coordinate and modal superposition methods were used to describe its large rigid displacement and small deformation. By the second Lagrange equation, the vehicle eentroid＇ s displacements, rotational angle and modal coordinates were chosen as generalized coordinates and then the vehicle＇ s rigid-flexible coupling dynamic equations were obtained. By numerical simulation, the results of vehicle＇ s motion parameters and transverse internal loads were acquired.The calculation results showed that differences of the vehicle＇ s motion parameters between the rigid-flexible coupling model and the rigid body assumption are noticeable and the peak magnitude of the vehicle＇ s transverse internal loads in the rigid-flexible coupling model is higher remarkably than that in the rigid body assumption.

关 键 词：sub-launched vehicle rigid-flexible coupling hybrid coordinate dynamic responses 

分 类 号：V414[航空宇航科学与技术—航空宇航推进理论与工程]