对船舶舱室噪声规范要求与建筑规范比较,在分析空调风系统噪声源的基础上,重点介绍建筑、国外船舶和国内船舶空调风管路和末端装置消声降噪设计现状,对国内船舶空调系统消声降噪设计提出发展建议.

The NUMECA software is used to numerically calculate the impeller of a centrifugal fan.The result shows that design flowrate is larger than the required flowrate of system.The interior flow separation phenomenon is very serious when the impeller is operating in stall operation of actual working.

An analysis and resolving of rolling bearing malfunction is offered to indicate that it's possible for rolling bearing to breakthrough the allowing rev if some special measures are taken.

The screw mode curve is the kernel where the screw pump works. In its application,it is found that there is an obvious protruding arris at the joint of force-transferring gear model of the existing five-screw pump. Through the theoretical computation and analyses of the mode curve,it is found that there is an inflexion at the joint of the curves; therefore the paper puts forward the thought of mode curve design. In addition,when the five-screw pump is in application,some impurities come into the slide bearing of the pump so that the impurities are glued onto the inner surface of the bearing,so this paper proposes that the structure of the pump would be improved to give a reference for the future design of the pump and heighten its reliability.

某给水加压站施工中变频器对设备电磁干扰问题的处理实践,总结了变频器电磁干扰问题的解决方法及经验,同时对变频控制系统设计及施工中应注意的问题进行了说明.

阐述了襄樊铁路枢纽给水加压站微机自控恒压变频调速设计的过程及微机自控的系统构成.