便携式移动通信基站自锁地梁基础受力性能分析

便携式移动通信基站由于其快速建站、移动方便等优点被广泛应用.由于不需要开挖基础,现行规范对基站基础设计尚无计算公式.本文利用有限元分析软件ANSYS对自锁地梁基础进行数值分析,评价其整体受力性能,分析结果表明:自锁地梁基础整体性能好,基础应力小,调整基础尺寸能满足基底脱开率要求.     

摩擦与自锁条件在平衡问题中的应用

摩擦是自然界中普遍存在的现象，也是机械制造中众所关注的课题。在物理教学中我们应注重摩擦的重要作用与自锁条件在平衡问题中的应用。     

An analysis of contact deformation of auxetic composites

The adaptive mode of frictional interaction has been studied as a self-locking effect upon contact deformation of isotropic and anisotropic auxetic materials with a negative Poisson ratio. This effect manifests itself in the fact that the bearing capacity of the joint rises with increasing shear load. In particular, the parameters of stress state (contact load, tangential stresses, slippage, etc.) were determined for a double-lap joint under conditions of compression with or with out shear. The contact interaction was analyzed by the finite-element method for three profiles of symmetrically located contact elements (plane, cylindrical, and wedge-shaped). The Poisson ratio was varied within the range theoretically admissible for isotropic elastic media. Analogous calculations were also performed for a joint with a deformed element made of an anisotropic auxetic composite, whose reinforcement angle was varied. The maximum loads, tangential stresses, and slippage are obtained as nonlinear functions of Poisson ratio (in the isotropic case) and reinforcement angle of the composite material. The stress concentration and the increased ultimate shear forces are also estimated. __________ Translated from Mekhanika Kompozitnykh Materialov, Vol. 42, No. 5, pp. 681–692, September–October, 2006.     

圆偏心夹紧机构在机床上的应用

从理论上分析了对圆偏心夹紧原理、特性及自锁备件，利用圆偏心的机构特点，实现了机床尾座的夹紧。该方法操纵方便，夹紧可靠。     

室外消火栓撞断自锁机构设计

通过对室外消火栓结构进行分析，指出了目前室外消火栓结构上存在的缺陷，介绍了复式螺纹机构在室外消火栓中的应用，并运用强度分析理论对消火栓零件的强度进行了合理的设计，初步解决了室外消火栓被撞断后的自锁问题．     

On models of dynamic systems with dry friction

An approach to the design of models of dynamical systems with high dry friction in the kinematic pair is developed. The members of the kinematic pair are represented by parts of rigid bodies. The system as a whole is considered to have a variable structure. According to this assumption, two modes of motion with different dissipative characteristics are possible. The states in which the modes exchange and the motion switches over into critical modes with dynamic self-locking are established. A system with a variable transfer function between members that form a nonideal constraint is described __________ Translated from Prikladnaya Mekhanika, Vol. 43, No. 5, pp. 97–105, May 2007.     

辙叉装卸机械手的研究设计

介绍了一种铁路辙叉快速自动夹紧机构,并对该机构工作原理及特点进行了分析和论述。     

一种材料和结构设计的新概念

根据拓扑自锁原理介绍了一种新的复合材料和结构设计的概念，无须使用粘结材料，来形成一种具有设计所要求性能的材料或结构。研究证明：按照这样的概念，利用不同几何形状的小“构件”(包括以平面形成的四面体，以及以曲面形成的立体)均能形成具有良好性能的层状自锁结构。主要以四面体形成的自锁结构为例，讨论了这种自锁结构的力学性能和自锁机理。     

滚珠螺旋副中滚珠滑移及自锁效应分析

针对限制滚珠螺旋副高速运转的滚珠滑移及自锁现象,建立滚珠螺旋副的三维实体模型,并对滚珠运动特性进行理论计算和分析,揭示出滚珠螺旋副中滚珠滑移和自锁效应产生的原因以及对滚珠螺旋副高速性能的影响。以滚珠运动规律为基础,推导滚珠滑移速度公式,提出如何避免滚珠卡死及减小滑移以提高滚珠螺旋副高速性能的方法。并用ADAMS软件对其进行了动力学仿真分析,仿真结果证实了所推导滚珠运动规律的正确性。     

气体渗碳炉失控保护装置的研制

给出了井式渗碳炉失控保护装置的总体框图和主要实用电路、讨论了设计要点、电路原理、元器件选择及该装置的技术参数。经过实验，效果良好。