Rudolf Scheidl, Gudrun Mikota,
"The Role of Resonance in Elementary Hydraulic Switching Control"
, in Proceedings of the Institution of Mechanical Engineers, Part I: J. Systems and Control Engineering, Vol. 217, Seite(n) 469-480, 2003
The Role of Resonance in Elementary Hydraulic Switching Control
Sprache des Titels:
Elementary hydraulic switching control aiming at energy efficiency can be done by connecting a hydraulic cylinder alternately with a high pressure and a tank line in a pulse
width controlled mode. The switching frequency is crucial for the energetic efficiency as well as for the speed fluctuation of the generated motion. This paper clarifies why and in which way the efficiency optimal switching frequency is related to some resonance condition. A
simple nonlinear, nondimensional, second order differential equation is derived which represents the dynamic behavior of the drive system. It is investigated by asymptotic
expansion methods. If valves with a relatively small nominal flow rate are used the optimal frequency is close to the natural frequency of the load oscillating in the hydraulic cylinder's compressible hydraulic fluid. Larger valves enable higher efficiency and weaken the role of
resonance. The optimal frequency becomes smaller.
Sprache der Kurzfassung:
Proceedings of the Institution of Mechanical Engineers, Part I: J. Systems and Control Engineering