两级扭杆弹簧的结构设计与计算

现代的汽车设计中,舒适性越来越被重视.对汽车平顺性的要求也越来越高.特别是对客车和卡车的舒适性要求逐渐提高,单级扭杆弹簧悬架已很难满足人们对舒造性的要求.介绍扭杆弹簧的一种新结构,这种弹簧分为两级,其刚度为变刚度,能有效地提高弹簧的性能.还给出了两级扭杆弹簧的设计方法和实例计算.     

车辆扭杆弹簧疲劳载荷谱的编制

该文讨论了编制车辆悬挂扭杆弹簧结构疲劳载荷谱的原则、方法和程序。该文结合某中型车辆使用情况,确定了车辆任务剖面、结构载荷环境、结构载荷情况以及载荷简化原则和方法。最近,阐述了结构疲劳试验谱的编制过程。为扭杆弹簧结构寿命估算提供了编谱方法。     

Torsion classes of <Emphasis Type="Italic">MV</Emphasis>-algebras

 Torsion classes of MV-algebras are defined as radical classes which are closed with respect to homomorphisms; in this paper we investigate their relations to radical classes of lattice ordered groups and to varieties of MV-algebras. Supported by Grant VEGA 1/9056/02.     

攀钢冷轧厂HC轧机扭振研究

理论分析得出 HC轧机各机列固有频率和扭矩放大系数 ,测试分析得出该轧机实际扭转负荷 ,综合得出对生产的指导作用     

垂直井眼中扭压载荷作用下管柱轴向稳定性分析

文章讨论了管柱垂直井眼中,考虑轴向压缩载荷、扭矩、管柱内外压力、摩擦力共同作用下的屈曲分析问题。运用能量法及变分原理得到了新的高阶非线性微分方程。同时能量法求解了考虑扭矩作用下管柱的临界载荷问题,推导出了新的临界载荷表达式,讨论了扭矩作用下对管柱临界载荷的影响。     

微位移机构的现状及趋势

微位移机构是精密机械和精密仪器的关键部件之一.介绍了一些典型的微位移机构的结构、原理、特点和应用,并对这些机构进行了比较.     

Torsion of thin-walled beams of open cross-section with influence of shear

An approximate analytical approach to the torsion of thin-walled beams of open cross-section with influence of shear is presented. It is assumed that the normal stresses in the cross-section contour direction are small compared to the normal stresses in the beam longitudinal direction that can be ignored in the stress–strain relations. The stresses and displacements are obtained in the closed analytical form. It is assumed that transverse load can be reduced to moments of torsion only, with respect to the cross-section shear centre. The beam will be subjected to torsion, with respect to the shear centre, i.e. the principal cross-section sectorial coordinate, in the case of cross-sections with two axes of symmetry; to torsion and bending in the case of cross-sections with one axes of symmetry and to torsion, bending and tension in the case of general cross-sections. An illustrative example of beam with one axis of symmetry is given.     

寻找交接点--盐城师范学院图书情报中心设计

对旧建筑进行改造、加建，使旧建筑筑与新建筑通过一种创造性的方式结合在一起，具有非常现实的意义和巨大的价值。该文试国通过盐城师范学院图书情报中心的设计探索，讨论在原有校园肌理和新校园规划轴网叠合的基础上，积极寻求新老建筑优化交接的可能性，以简洁理性的方式最大限度的适应环境制约，创造独特的藏阅空间。     

Performance of concrete-filled thin-walled steel tubes under pure torsion

In practice, concrete-filled steel tubes (CFST) are often subjected to torsion. To date, such a problem however has not been addressed satisfactorily by design codes. The present study is thus an attempt to study the torsional behaviours of concrete-filled thin-walled steel tubes. ABAQUS software is used in this paper for the finite element analysis (FEA) of CFST subjected to pure torsion. A comparison of results calculated using this modelling shows good agreement with test results. The FEA modelling was used to investigate the influence of important parameters that determine the ultimate torsional strength of the composite sections. The parametric studies provide information for the development of formulae to calculate the ultimate torsional strength, as well as the torsional moment versus torsional strain curves of the composite sections.     

钢筋混凝土构件统一理论研究的发展

本文就钢筋混凝土构件在复合受力下承载力的各种破坏机理理论的研究现状进行了较为全面、详细的分析和比较 ,指出该领域内的研究前沿和值得关注的趋势