Titlebook: Hydraulic and Electric-Hydraulic Control Systems; R. B. Walters Book 2000Latest edition Springer Science+Business Media Dordrecht 2000 alg

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Hydraulic Power SourceIn hydraulic control systems the pump supplies fluid either at substantially constant pressure which is independent of the external load acting on the actuator or, alternatively, at a supply pressure which is a function of the external loading.

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Data Transmission ElementsThe function of the data transmission element is to sense the controlled output quantity and to convert it to a signal which can be used to either monitor the output or to act as a feedback device in a closed loop control system. The controlled output variable in a hydraulically operated force—motion control system can be:

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Control ConceptsThe majority of closed loop systems are liable to become unstable or inadequately damped if the critical parameters are not maintained within suitable limits. One of the major objectives of a theoretical system investigation is to determine parameters compatible with adequate stability.

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Principles of Flow Control for Valve-Operated Systems: Part 1In hydraulic control systems of this type, flow is controlled by throttling the fluid passing through the variable orifice or orifices of a proportional control valve, thus converting pressure energy into kinetic energy. Provided the flow demand is within its capacity, the pump will act as a source of constant or substantially constant pressure.

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Further Case StudiesThe investigation of the simple third order system in Chapters 11 and 15 can be extended to cover more complex systems, and we shall now proceed to analyse a number of typical system configurations.