Helmut Kogler, Rudolf Scheidl, Bernd Hans Schmidt,
"Analysis of Wave Propagation Effects in Transmission Lines due to Digital Valve Switching"
: Proceedings of the Bath/ ASME Symposium on Fluid Power & Motion Control, 10-2015
Analysis of Wave Propagation Effects in Transmission Lines due to Digital Valve Switching
Sprache des Titels:
Proceedings of the Bath/ ASME Symposium on Fluid Power & Motion Control
In digital hydraulic systems, switching valves have opening
and closing times in the range of a few milliseconds. Due to
this fast switching, high bandwidth pressure pulsation is excited,
which is the stimulus for airborne noise up to some kilohertz.
Since the human ear is very sensitive to audible noise in this frequency
range, an analysis of the influence of the valve?s opening
curve on the pressure surge in the pipe system is intended. The
study is based on simulations employing dynamic pipe models
for linear wave propagation and laminar fluid flow. In particular,
a simple pipe system with a valve at one end and a pressure
boundary at the other end of the pipe is investigated. It is
shown, how the valve opening characteristics of spool and seat
type switching valves influences the pipe responses. Also the role
of parasitic inductances due to the valve block bores is discussed
and it is shown how the switching characteristics influences the
dynamical effects on the pressure pulsations in the pipe system.