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楔块连接以其连接可靠、装卸方便、空间利用率高等优点,广泛应用于圆截面舱段对接结构。楔块强度校核一般参照键联连接工程校核方法,但是需要先获取楔块传递载荷。采用有限元方法可以模拟楔块与舱体之间的复杂传力关系,更为全面地获得整体结构应力分布,但是由于接触面多,计算收敛性差。基于ANSYS参数化设计语言(APDL)开发了典型圆截面舱段楔块连接结构全接触分析命令流,对结构尺寸、公差配合间隙、预紧力等进行了详细设计。根据理论分析结果和工程应用经验,楔块连接结构全接触分析模型将正楔、反楔和直楔作为整体进行建模,而通过热载荷模拟楔块初始预紧力;在楔块、内舱体和外舱体之间建立两两接触关系,真实地反映了结构传力状态。在各独立楔块之间建立弹性连接结构,对弹性连接结构施加附加位移约束,有效解决了计算发散问题;同时通过调节弹性连接结构刚度,将附加约束对本体结构的影响减小到工程可接受程度。
Wedge connection with its reliable connection, easy loading and unloading, space utilization advantages, widely used in circular cross-section docking structure. Wedge strength checks generally refer to the connection method of key engineering, but need to obtain the wedge transfer load. The finite element method can simulate the complex force transmission between the wedge and the pod, and obtain the overall structure stress distribution more completely. However, due to the large number of contact surfaces, the calculated convergence is poor. Based on the ANSYS parametric design language (APDL), a full contact analysis command flow of typical circular section wedge connecting structure was developed, and the structure dimension, tolerance fit clearance and preload force were designed in detail. According to the results of theoretical analysis and engineering experience, the wedge connection full contact analysis model models the positive wedge, the inverse wedge and the straight wedge as a whole, and simulates the initial pretightening force of the wedge by the thermal load. Body and the outer body to establish a two-touch relationship between the real reflection of the structure of the force state. The elastic connection structure is established between the independent wedges and the additional displacement constraint is imposed on the elastic connection structure, which effectively solves the problem of computing divergence. At the same time, by adjusting the stiffness of the elastic connection structure, the influence of additional constraints on the structure of the body is reduced to the acceptable level degree.