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文章分析了斜拉索倾角对支撑臂剪切刚度和扭转刚度的影响,给出了一定横杆长度下斜拉索倾角的最佳取值范围。以支撑臂杆件不发生屈曲失效和支撑臂在最大负载下不发生坍塌为准则,给出了斜拉索预张力的上下限。基于Hertz接触理论,推导了斜拉索预张力与球铰副接触刚度的关系,将关系式引入支撑臂单元段的有限元模型中,进行了模态分析,给出了斜拉索预张力对单元段一阶弯曲频率的影响曲线。分析结果表明,单元段一阶频率先随着斜拉索预张力的增加而增加,但当预张力超过一定值后,预张力的增加反而会使一阶频率降低;得到了斜拉索预张力优选范围。推导了锁定装置解锁力与支撑臂收拢时所需外力矩的关系,利用ADAMS软件对展开/收拢过程的扭矩进行了仿真,对支撑臂单元段展开/收拢过程中所需力矩进行了试验测试,试验结果表明,力矩的理论计算及仿真与试验结果基本吻合,误差在3%以内,证明了理论计算与仿真的正确性。研究结果为球铰接杆式支撑臂中斜拉索组件设计提供了理论依据。
The article analyzes the influence of the inclination of the stay cable on the shear stiffness and the torsional stiffness of the support arm, and gives the optimum range of the inclination of the stay cable under a certain length of the cross bar. The upper and lower limits of the prestress of the stay cables are given by taking the buckling failure of the support arm members and the collapse of the support arm under maximum load as the criterion. Based on the Hertz contact theory, the relationship between the prestress of the stay cable and the contact stiffness of the ball joint is deduced. The relationship is introduced into the finite element model of the support arm. The modal analysis is carried out, Influence curve of first-order bending frequency of unit section. The analysis results show that the first-order frequency of the unit section increases first with the increase of the pre-tension of the stay cable, but when the pre-tension exceeds a certain value, the increase of the pre-tension reduces the first-order frequency; Preferred range. The relationship between the unlocking force of the locking device and the required moment when the supporting arm is closed is deduced. The torque of the unfolding / folding process of the supporting arm is simulated by ADAMS software, and the required torque during the unfolding / The experimental results show that the theoretical calculation and simulation of torque are in good agreement with the experimental results and the error is within 3%, which proves the correctness of theoretical calculation and simulation. The research results provide a theoretical basis for the design of the stay cable assembly in the ball-hinged rod support arm.