摘要
全面考虑空间可展机构铰单元中的轴向和径向间隙,从三维间隙铰节点几何构形出发,给出销轴和轴套间在销轴轴向和径向最小距离的解析表达.构造了三维间隙铰节点接触与分离的切换点判别条件,考虑销轴和轴套"分离"和"接触"的2种状态,法向接触力采用非线性弹簧阻尼模型,摩擦力采用Coulomb摩擦模型,分段建立了含三维间隙铰节点可展机构的动力学方程.对含三维间隙铰节点可展桁架的运动过程进行了数值计算,计算结果表明,销轴和轴套间不仅发生桁架平面内的接触碰撞,而且径向间隙导致桁架平面外也产生波动的接触碰撞,瞬时的接触力可达理想铰十几倍.
The radical and longitudinal clearances in the revolute joint of space deployable mechanism were considered. The analytical definition of the least distance between pin and journal in the radical and longitudinal direction of the pin was obtained based on the geometrical configuration of three-dimensional revolute clearance joints. The discriminant equation was established to decide contact and separation between pin and journal in the three-dimensional clearance joints. The normal contact force between journal and pin was modeled by a nonlinear elastic-damper model and the tangent friction was modeled by the Coulomb＇s frictional model. Then the movement process was divided into ＂contact＂ and ＂separation＂ to found the dynamic equation of the multi-body system . The numerical analysis of the deployable truss show that the contact occurs not only in the truss plane, hut also out of the truss plane. The instantaneous contact force is one to ten-odd times of the force in the idea revolute joint.
出处
《浙江大学学报（工学版）》
EI
CAS
CSCD
北大核心
2009年第1期177-182,共6页
Journal of Zhejiang University：Engineering Science
关键词
三维间隙铰
可展机构
接触
多体系统动力学
three-dimensional revolute clearance joint
deployable mechanism
contact
multi-body system dynamics
