某电厂板仓钢支架结构有限元分析与验算

对某电厂钢板仓钢支架结构进行有限元分析.依据相关规范对支架结构进行验算.对支架结构提出了设计修改方案.有限元分析和计算表明,改进后的支架结构强度、刚度、稳定性符合要求.     

刮板输送机刮板链故障分析与技术改进

从理论和实践角度分析了刮板输送机刮板链的主要故障以及故障发生的原因,针对故障原因提出了制造工艺技术改进措施,同时提出了刮板输送机在使用方面和维护方面的改进措施,为提高刮板输送机的可靠性提供了依据。     

Measuring the results of quality improvement work

The authors confirm the importance of the management loop, PLAN-DO-CHECK-ACT, and that the quality programme is a necessary tool for organizing and controlling the process.     

Aspect Ratio to Maximize Sediment Transport in Rigid Bank Channels

The continuity equation, Manning’s equation, Einstein’s wall correction procedure and sediment transport equations are combined to indicate channel aspect ratios which maximize sediment transport for a given water discharge in rigid-bank trapezoidal and rectangular channels with fixed slope. Higher aspect ratios are required to maximize sediment transport for channels conveying bed load than for those with a dominant suspended load. A total load equation predicts optimum aspect ratios lying in between those for bed load and suspended load channels. The equations imply that the optimum aspect ratio increases markedly as the channel bank to channel bed roughness ratio increases. The resulting optimum ratios are smaller than the aspect ratios of many natural rivers.     

JB31-160T压力机工装改进

针对老工装效率低、操作不方便的情况,设计了新工装,提高了效率,方便了操作,减少了中停,满足了生产需求。     

准高速条件下三轨受流器靴轨动态接触分析

基于Ls-Dyna有限元仿真平台建立准高速(160 km/h)运行条件下受流器通过第三轨端部弯头及轨缝错牙区域的有限元模型,分析不同运行速度、不同结构参数对受流器靴轨冲击振动响应的影响规律。研究结果表明,增大受流器系统阻尼是改善碰撞冲击响应的最佳手段。为进一步探究系统阻尼对准高速运行条件下常态振动工况的影响规律,基于MATLABSimulink平台建立受流器多体动力学模型,计算结果表明,合理增加受流器系统阻尼,可有效提高准高速运行条件下受流器滑靴与第三轨的匹配性能。根据上述研究结果提出一种第三轨受流器的适应改进方案,使其能够满足160 km/h高速运行要求。     

Home truths: Are housing-related events more important for residents’ health compared with other life events?

Moving home and home improvements are significant life events, but their health impacts are rarely studied in relation to other life events that occur relatively frequently in deprived populations. This article examines both housing and personal life events over a three year period among a study group living in deprived areas of Glasgow, in order to consider their impacts upon the health and well-being of residents. Housing-related events are the most frequently occurring life events, with relatively minor negative impacts upon physical and mental health and mental well-being; the effects of housing events are attenuated when other life events are taken into account. The largest negative effects on health are associated with serious health episodes, crime victimisation and relationship break-up, with the largest positive effects associated with getting a job. There is a case for holistic regeneration which offers personal support for life events and seeks positive interactive effects.     

Housing Improvements,Perceived Housing Quality and Psychosocial Benefits From the Home

In advanced countries, where many of the most deleterious physical health effects of poor housing have been eradicated or substantially reduced, there has been increasing interest in mental health and psychosocial benefits as housing outcomes. Recently available data, based on a large-scale survey of social renters in Glasgow, have offered the opportunity to explore the psychosocial benefits of home in previously unavailable detail, over a range of property types and housing improvement interventions. Findings indicate that home improvements have mediating effects upon the psychosocial benefits, which occupants derive from their homes via their impacts upon perceived home quality. However, landlord relations and the quality of the wider neighbourhood within which improvements take place are shown to be important moderators of this relationship. In particular, landlords' overall service performance, how they keep tenants informed and how they take tenants' views on board, all make a difference to perceptions of home quality and to psychosocial status and control.     

聚乙烯缠绕结构壁管材B型结构的改进

本文介绍了聚乙烯缠绕结构壁管的常见结构,为了克服管材尤其是大口径管材在实际生产过程中出现的问题,对其B型结构进行改进,改变PP骨架管包覆结构,优化了产品结构,在减少原材料用量的同时,提高了产品的环刚度和质量。     

罩极电动机轴向串动间隙的调整改进和应用

罩极电动机在国内外通风和制冷行业得到了快速的发展。通过对电动机转子和端盖装配结构进行改进设计,为罩极电动机的工艺优化和质量提升打下了基础。