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RESEARCH PRODUCT
Numerical and Experimental Study of a Novel Concept for Hydraulically Controlled Negative Loads
Michael Rygaard HansenJesper Kirk SørensenMorten Kjeld Ebbesensubject
pressure compensated valveEngineeringSeries (mathematics)business.industrySecondary circuitStructural engineeringBoomlcsh:QA75.5-76.95Computer Science Applicationscounterbalance valveinstabilities in hydraulic systemsload-holding applicationControl and Systems EngineeringControl theoryModeling and SimulationNonlinear modelnonlinear modelCylinderDirectional Valvelcsh:Electronic computers. Computer scienceHydraulic machinerybusinessReduction (mathematics)Softwaredescription
This paper presents a numerical and experimental investigation of a novel concept that eliminates oscillations in hydraulic systems containing a counterbalance valve in series with a pressure compensated flow supply. The concept utilizes a secondary circuit where a low-pass filtered value of the load pressure is generated and fed back to the compensator of the flow supply valve. The novel concept has been implemented on a single boom actuated by a cylinder. A nonlinear model of the system has been developed and an experimental verification shows good correspondence between the model and the real system. The model is used for a parameter study on the novel concept. From the study it is found that the system is stable for large directional valve openings and that for small openings a reduction of the oscillatory behaviour of the system can be obtained by either lowering the eigenfrequency of the mechanical-hydraulic system or by lowering the pilot area ratio of the counterbalance valve.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2016-10-01 | Modeling, Identification and Control |