液压胶管的弹性模量

gloyer

各位前辈，想请教个问题，在液压伺服系统中，伺服阀和油缸之间，一般是直接连接的，但现在我遇到一种情况，就是伺服阀和油缸之间必须用液压胶管连接，大概有五六米的样子，请问如何定量地分析出这段液压软管对整个系统的影响？如果在AMESim软件中进行仿真，那么这个软管的弹性模量，一般取多大的值合适？请前辈们指导指导，万分感谢！

PEN

对于软管制造商来说，这是一个很好的问题。软管的液压电容根据制造商的质量和软管中的导线数量变化很大。软管制造商应具有软管长度或软管中的油量的液压电容值。

我在贸易展览会上对此抱怨很多。到目前为止，我从来没有足够让软管制造商感到尴尬。软管制造商不在乎。软管电容越低，软管传输的噪音就越大。
https://www.hydraulicspneumatics.com/applications/agricultural/article/21882621/selecting-the-right-hose-can-quiet-things-down
对于运动控制器，我们希望软管具有较低的电容，从而传递更多的噪声。

这是一个世界性的问题。可以制造出具有低液压容量的软管的软管制造商将比其他软管制造商具有更大的优势。

我已经考虑了很多，因为它减少了液压缸和负载的固有频率。而且，由阀门的打开和关闭引起的压力变化将需要大约1毫秒的时间才能使每条1.5米的软管在阀门与活塞之间移动。较高的电容和延迟会对运动控制产生不利影响。
https://www.hydraulicspneumatics.com/technologies/controls-instrumentation/article/21888057/hydraulic-capacitance-and-dead-time
This is a good question for the hose manufacturer. The hydraulic capacitance of hose varies a lot depending on the manufacturer’s quality and number wires in the hose. The hose manufacturer should have a value for the hydraulic capacitance for a length of hose or volume of oil in the hose.

I complain about this a lot at trade shows.  So far, I have never been able to embarrass a hose manufacturer enough.  The hose manufacturers do not care.  The lower the hose capacitance, the more the hose transmits noise.
https://www.hydraulicspneumatics.com/applications/agricultural/article/21882621/selecting-the-right-hose-can-quiet-things-down
For motion controller we want hose with a lower capacitance so transmits more noise.

This is a worldwide problem. A hose manufacturer that can make hose with a guaranteed low hydraulic capacitance would have a big advantage over other hose manufacturers.

I have thought about this a lot because it reduces the natural frequency of the hydraulic cylinder and load.  Also, the pressure changes caused by the valve opening and closing will take about 1 millisecond to travel each 1.5 meters of hose between the valve to the piston.  The higher capacitance and delay adversely affect motion control.
https://www.hydraulicspneumatics.com/technologies/controls-instrumentation/article/21888057/hydraulic-capacitance-and-dead-time