关于加载问题的请教

auca

正弦波加载频率和固有频率是什么关系？

比如加载频率是1HZ ，2HZ  ,5HZ  10HZ,20HZ等，选多大固有频率的缸？

PEN

这取决于相位是否将被控制。
如果来自反馈的实际位置必须与正弦波发生器的目标位置匹配，则固有频率需要比正弦波发生器的频率大约四倍。 如果相位无关紧要，那么固有频率可以低得多但不低于固有频率。

It depends on whether the phase is going to be controlled.
If the actual position from the feedback must match the target position from the sine wave generator, the natural frequency needs to be about four times greater than the frequency of the sine wave generator.  If phase does not matter, then the natural frequency can be much lower but not lower than the natural frequency.

auca

Thank you.   Look at this first:

If the natural frequency is less than 15Hz, it is only suitable for two-point and one-line position closed-loop; 30 Hzis not a problem in industrial application closed-loop; the simulator is morethan 100 Hz; and the durability test equipment is required.

pen:  This is true for most motion controllers.

The RMC75, RMC150 and RMC200 can easilycontrol when the natural frequency is 2.5 Hz. Maybe lower but no one has gone below 2.5Hz.

-原文地址：https://www.iyeya.cn/thread-66782-1-1.html

phase does not matter, then the naturalfrequency can be much lower but not lower than the natural frequency.

Is it the following meaning?

If it is a general controller:

If the sinusoidal loading frequency is 1HZ-, then the natural frequency should be greater than 4 HZ, not more than 30HZ.

If the sinusoidal loading frequency is5HZ-, then the natural frequency should be greater than 20 HZ, not good,greater than 30 HZ, or more.

If the sinusoidal loading frequency is10HZ, then the natural frequency can be calculated by four times, greater than40HZ.

If the sinusoidal loading frequency is15HZ, then the natural frequency can be calculated by four times, greater than60 HZ.

If it is a DETLA controller:

If the sinusoidal loading frequency is 1HZ,then the natural frequency should be greater than 2.5HZ.

If the sinusoidal loading frequency is 5HZ,then the natural frequency should be greater than 5HZ, not less than 5HZ.

If the sinusoidal loading frequency is 10HZ, then the natural frequency should be greater than 10 HZ, and not less than10 HZ.

If the sinusoidal loading frequency is15HZ, then the natural frequency should be greater than 15HZ, and it should notbe less than 15HZ.

That is to say, using DETLA controller, thenatural frequency of the hydraulic cylinder is greater than 2.5HZ, not lessthan the loading frequency can /.

先看这个：

游勇：若固有频率低于15赫兹，只适合二点一线的位置闭环；30赫兹在工業应用的闭环上没问题；模拟器则要100赫兹以上；耐久测试器械，则看要求了。

是不是下面的意思

如果是普通控制器:

如果正弦加载频率是1HZ-,   那么固有频率要大于4 HZ   也不行，  要大于30HZ,以上  

如果正弦加载频率是5HZ-,   那么固有频率要大于20 HZ，也不行，  要大于30HZ,以上

如果正弦加载频率是10HZ,  那么固有频率可按4倍计算，大于40HZ就可以了

如果正弦加载频率是15HZ,  那么固有频率可按4倍计算，大于60 HZ就可以了

如果是DETLA控制器:,      

如果正弦加载频率是1HZ        那么固有频率要大于2.5HZ,就可以。

如果正弦加载频率是5HZ        那么固有频率要大于5 HZ就行，，不能小于5 HZ

如果正弦加载频率是10HZ,       那么固有频率要大于10 HZ,就行，不能小于10 HZ。

如果正弦加载频率是15HZ,       那么固有频率要大于15HZ,就行，不能小于15HZ。

就是说使用DETLA控制器:， 液压缸固有频率大于2.5HZ,   不低于加载频率就可以/。

auca

静态加载是否需要计算固有频率？油缸直径满足F= PA-PB  是否就可以了，还需要用固有频率公式校核油缸直径吗？

PEN

当使用具有二阶导数增益并向前馈送的RMC时，固有频率应该是加速频率的约2.5倍。 其他控制器需要4倍的加速频率。

对于液压缸频率，静态负载不需要自然，但是如果压力必须改变，则阀必须足够快以快速地改变压力。

#3 is not clear.
The natural frequency should be about 2.5 times the frequency of acceleration when using a RMC with the second derivative gains and feed forwards.  Other controllers will require 4 times the frequency of acceleration.

Static loading does not require a natural for the hydraulic cylinder frequency but the valve must be fast enough change the pressure rapidly if the pressure must change.

auca

PEN 发表于 2019-6-22 12:04
当使用具有二阶导数增益并向前馈送的RMC时，固有频率应该是加速频率的约2.5倍。 其他控制器需要4倍的加速频 ...

谢谢，如果加载频率要求1HZ,    对于普通控制器，那么油缸固有频率需要4HZ,   还是要30HZ以上？
Thank you. If the loading frequency is 1HZ, for the general controller, then the natural frequency of the cylinder needs 4HZ, or more than 30HZ?