Title:An RC Filter for Hydraulic Switching Control with a Transmission Line Between Valves and ActuatorAuthor(s):Rainer Haas, Evgeny Lukachev, Rudolf ScheidlAbstract:Hydraulic switching control with fast switching valves may excite unacceptable hydraulic and mechanical oscillations. Particularly if transmission lines are used, which have many oscillation modes, the avoidance of resonances by a proper timing of the switching pulses is hardly feasible. Then, passive filters may be a good solution. A simple RC filter applied to a cylinder drive with a transmission line to the switching valves is investigated by a transfer function analysis, numerical methods, and experiments. Properties of the dynamic behaviour are elucidated by approximate relations derived from the transfer function by asymptotic methods. A simple dimensioning rule recommends sizing the filter resistance close to the hydraulic impedance of the transmission line. The capacitance’s sizing is a trade off between a potential reduction of the resonance peak due to the cylinder natural frequency and a softness of the hydraulic drive system.Journal:International Journal of Fluid PowerPublisher:Taylor & FrancisEditor(s):M. IvantysynovaISSN:1439-9776Page Reference:page 139-151, 24 page(s)Publishing:11/2014Volume:15Number:3