Hydraulic Pipe Tube
In a hydraulic control system, what is the trade off between viscosity and bulk modulus ?
Take a air filled pipe and piston hydraulic systems and another similar system that is filled with honey. In this case, won't the air filled system, though it has a very low bulk modulus, still be more responsive than the low compressible honey filled system ? Is there an equation that helps decide the trade off between viscosity (tube resistance) and bulk modulus (compressibility) ?
Not that I know of. But, systems are designed to be responsive. So, it is a matter to meet the "responsiveness" requirements. It does not require such a fine detail. Wheather oil or air is used is just a matter of convenience.
Oil can buildup much higer pressures than air and, therefore, it used to obtain very high forces with relatively compact actuators, which saves space. They are much more compact than electric motors. On the other hand they require more cumbersome installations.
Compressed air, on the other hand, is very simple, but it is much more dangerous in case a hose shakes lose or a leak develops. Compressibility is rarely an issue. Tube resistance must be factored in, but it is a minor issue.
All the best.
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