施封锁、防松片止耳常见问题的分析

1 问题的提出 在轮对交验过程中,经常遇到施封锁开锁、断裂和某个轴端螺栓的六方平面无防松片止耳贴靠现象.施封锁的故障一般通过更换新品即可解决,但个别时候不能方便地将其从3个轴端螺栓中穿出更换;而防松片止耳则更难处理一些,直接在原件上处理一般达不到要求,而更换处理则浪费材料、耗费时间、增加成本.     

Simulation of Temperature Field in Original Segment of Concrete Box-Girder Bridge

Temperature field and its variation with time are necessary for analyzing the thermo-mechanical performance of mass concrete structures at their early ages. This paper carries out a temperature field simulation analysis for an original segment of a real box girder bridge with the finite element software ANSYS. Two representative exothermic rate models are used to describe the heat-releasing process caused by the cement hydration in concrete. The exothermic rate model that conforms to reality more closely is recognized by comparing the simulation results with the data gathered from the optical fiber temperature sensors pre-embedded in the original segment. The air temperature and wind velocity that constitute thermal boundary conditions are determined in the light of the local meteorological department and correlative research achievements of recent years. Moreover, the consideration for the steel formwork acting as a barrier to heat loss is also proved to be beneficial to improve the simulation effect.     

基于Virtual Lab仿真分析某项目进气系统声学性能优化

进气系统噪声通过进气口向外辐射,直接或间接地对驾驶室内噪声产生影响.在前期开发过程中,需要在管路上布置消声元件,消除进气系统噪声.文章基于Virtual Lab对进气系统声学性能进行仿真,通过分析仿真结果对初始方案展开优化,使其满足相关性能目标要求,为后续NVH调音工作打下坚实基础.     

浅谈档案管理工作与企业发展

企业档案是反映企业生产、科研、管理活动的真实记录,是企业适应复杂多变的市场环境、提高竞争力的信息保障.在对外销售业务方面,档案室能及时向客户提供各类证书原件,确保了销售业务的顺利完成;在生产方面,可以为各生产车间、班组提供各项生产和设备的数据、资料,解决了很多生产上的难题,及时为生产提供技术支持.