推导空气预热器漏风的一般性计算公式，分析影响漏风的因素，提出了采用双密封技术，新结构静密封，安装漏风自动控制系统等降低漏风的对策。
The general prediction of leakage rate is presented. Influencing factors are analyzed. Countermeasures such as double seals, new structure of static seal, automatic control system are introduced.
介绍了一种基于双凸轮结构的摩托车发动机可变配气正时(VVT)机构自动控制装置。
An automatic control device of motorcycle variable valve timing (VVT) mechanism is introduced based on double CAM structure.
一种基于PLC的电液自动控制系统，采用了电液比例阀的双闭环控制系统。
This paper introduces an electrohydraulic control system based on PLC. A double close - loop control system with electro - hydraulic proportional valve is adopted.
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