moog伺服阀计算中液体刚度计算公式中的容积效率怎么理解？
我看不到Xp的理由。
这个文件是错误的。
没有理由为什么活塞移动的距离会影响自然频率
你有链接到这个文件？
如此多的液压文件是错误的。
看这个文件。 固有频率公式考虑了不同的活塞表面积。 给出了固有频率出现的公式。
http://deltamotion.com/peter/Mathcad/Mathcad%20-%20Natural%20Frequency%20Metric.pdf You can download here : https://www.iyeya.cn/thread-60959-1-1.html 网址不会显示我在穆格网站上的原始PDF文件。网址指向这个论坛，所以PDF文件在这里上传。
该文件未被检查。通常穆格是非常准确的。
本文档对工程目的来说不够详细。
未提及的一个限制因素是阀门的相位滞后必须加到其他相位滞后。开环的总和不应超过135度。
该文件没有正确涵盖阀门尺寸。该文件假定气缸直径已知并且在活塞的两侧是相同的。第一步应该是根据运动轨迹和质量来确定圆柱体和杆的直径。然后可以计算阀门尺寸。
加速度的值不好。该公式计算假设线性斜坡的平均加速度。该公式应考虑到S曲线。
pdf文件建议P只有控制适用于大多数应用程序。 P只有控制不足以进行测试，压机和压铸。一般而言，P只有控制能够减缓生产。
请勿在阀门和气缸之间使用软管。
第28页第5节是对VCCM方程的简化。穆格公式没有考虑到不同方向的不同力量。
第29页的第7章，慢速DAC会增加相位滞后。
这些规格就好像控制器是在20世纪80年代末或90年代初设计的一样。这很奇怪，因为MOOG有一个32位的液压伺服控制器。文件日期表示2016年。
The urlwould not show me the original pdf file on the Moog website. The url points to this forum so the pdf file was upload here.
The document was not checked.Normally Moog is very accurate.
This document was not detailed enough for engineering purposes.
A limiting factor not mentioned is that the phase lag of the valve must be added to the other phase lags.The sum should not exceed 135 degree in open loop.
The document does not cover valve sizing properly. The document assumes the cylinder diameter is known and is the same on both sides of the piston. The first step should be to determine the diameter of the cylinder and rod given the motion trajectory and mass. Then the valve size can be calculated.
The value for acceleration is not good.The formula calculates the average acceleration assuming a linear ramp.The formula should take into account s-curves.
The pdf file suggests P only control is adequate for most applications. P only control is not adequate for testing,presses and die casting. In general P only control slows production.
Do not use hose between the valve and the cylinder.
Section 5 on page 28 is a simplification of the VCCM equation.The Moog formula doesn't take into account differfent forces in different directions.
Section 7 on page 29,Slow DACs add to phase lag.
The specifications were made as if the controllers were designed in the late 1980s or early 1990s.This is strange because MOOG has a 32 bit hydraulic servo control.The document date says 2016.
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