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drop valve (蒸汽機中上下活動的)活門,活閥。

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This paper supplied a new way through variable frequency variable speed ( vfvs ) to change its output flow rate and adding a constant - pressure - drop valve , which could solve the defects in hydraulic pressure servo control system , such as low efficiency in control system , short life , poor ability in resisting pollution , low efficiency in driving system and flow rate , pressure pulse . and this way was proved to be effective 本論文針對傳統伺服控制系統效率不高、元件壽命短、抗污染能力差、驅動系統效率低、存在流量及壓力脈動等缺陷,利用先進的交流變頻調速技術改變液壓泵轉速的容積調速新方法,提出了在液壓系統中加一個定差減壓閥的新思路,較好地解決了液壓伺服系統存在的上述問題。

In chapter 4 , the principle drawing of the system is presented after adding a constant - pressure - drop valve . the operating principal of the valve is briefly introduced . the static mathematical model is built up and study is carried out by means of simulation under the circumstance of matlab , then the static working point is obtained 對定差減壓閥作了簡要的介紹,根據系統工作原理圖建立靜態數學模型進行仿真研究,由仿真結果分析系統靜態工作特性,得到靜態工作點;然后,建立系統動態模型,對其動態特性進行非線性仿真研究,并就環境因素變化對系統工作特性的影響作了詳細分析。