valve parameter

The thesis describes in detail the cooling system operating principle, especially the parameter calculation and selection of the main hydraulic element of the hydraulic drive system on the road-building machinery engine cooling device, and the selecting and matching of proportional spill valve and other designs, etc.

本论文对该冷却系统的工作原理、特别是发动机冷却装置液压驱动系统的主要液压元件的参数计算、选型及比例溢流阀的选择匹配等设计作了详细论述。

This system realizes the close-loop control of electro-hydraulic proportional valve based on digital PID algorithm, and developed a monitor application program for this system that can adjust the value of PID parameter online.

该系统实现了注塑机电液比例阀的闭环控制，并开发了与之配套的上位机监控软件，实现了PID参数的在线调整。

Also the calculation and selection of hydraulic cylinder, servo valve and other major element parameter are completed.

其次，根据液压控制系统的设计要求设计了液压伺服系统的控制回路；完成了液压缸、伺服阀等主要元件的参数计算与选型；对液压伺服系统的数学模型进行了研究。

A dynamic concentrative parameter model is adopted in the thermostatic expansion valve On the basis of the analysis of the characteristics of enclosure structure, the dynamic mathematics model is established through the simplification of boundary condition.

热力膨胀阀采用集中参数动态模型；通过对冷库维护结构的特点分析，采用边界条件简化处理的方法，建立相应的动态参数数学模型。

In order to establish matching contact model, this paper constructed dynamics analysis interface. Setting the valve parameter, inputting valve structure parameters by using MATLAB software platform, can draw the need of valve movement curve.

为了建立匹配性接触模型，论文编制出动力学分析人机界面，该系统对气门落座结构进行了参数化设置，运用MATLAB软件平台将气门结构参数输入，即可绘制出需要的气门运动曲线。

Optimization of Structural Parameter of Water Valve and Test of Hole Irrigating-sowing Machine

穴灌坐水播种机水阀结构参数优化与试验

Concentrative parameter model are adopted in the compressor and the thermostatic expansion valve.

压缩机采用集中参数模型；

The paper establishes a double-loop control model suitable for three-phase electric regulating valve with large capacity, presents the mathematical model of the velocity generator, which takes increment of valve position as input, and the velocity control strategy for fuzzy parameter self-aligning PID.

本文构建了适用于大流量三相电动调节阀的双闭环控制模型，提出了以阀位增量为输入量的速度发生器的数学模型和模糊参数自整定PID的速度控制策略。