Novel concept for stabilising a hydraulic circuit containing counterbalance valve and pressure compensated flow supply

Sørensen, Jesper Kirk; Hansen, Michael Rygaard; Ebbesen, Morten Kjeld

doi:10.1080/14399776.2016.1172446

Cited by 10 publications

(9 citation statements)

References 2 publications

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“…The model confirmed the results from the linear analysis in Sørensen et al (2016), that there is an elevated risk for instability at small DCV openings. The model shows that an improved system stability can be obtained by either reducing the eigenfrequency of the mechanicalhydraulic system or lowering the pilot area ratio of the CBV.…”

Section: Discussionsupporting

confidence: 79%

“…In Figure 20 the pressures during the work cycle are shown. The markedly increased pressure amplitudes and distinct oscillations are characteristic for an unstable system, which corresponds well with the linear stability analysis in Sørensen et al (2016). The deviations in amplitude that appear as the boom is lowered are considered acceptable due to the very violent oscillations of the physical setup that may have introduced phenomena not included in the model.…”

Section: Base Circuitmentioning

confidence: 75%

“…The authors have previously presented a novel concept capable of suppressing oscillations in hydraulic systems containing a CBV and a pressure compensated directional control valve (DCV), see Sørensen et al (2016). The concept utilizes a secondary circuit where a lowpass filtered value of the load pressure is generated and fed back to the compensator of the flow supply valve.…”

Section: Discussionmentioning

confidence: 99%

“…A linear stability analysis has indicated that small openings of the directional control valve result in stability issues (Sørensen et al, 2016). That linear analysis was, however, based on a simplified system and therefore a parameter study is conducted here with a view to investigate the oscillatory behaviour of the nonlinear system.…”

Section: Parameter Studymentioning

confidence: 99%

“…All of the approaches have certain drawbacks as compared to the base circuit. The authors have previously presented a novel concept for addressing this stability issue (Sørensen et al, 2016). It has the same steady state flow characteristics as the base circuit only without the corresponding oscillatory nature.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Numerical and Experimental Study of a Novel Concept for Hydraulically Controlled Negative Loads

Sørensen¹,

Hansen²,

Ebbesen³

2016

MIC

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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.

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Section: Discussionsupporting

confidence: 79%

Section: Base Circuitmentioning

confidence: 75%

Section: Discussionmentioning

confidence: 99%

Section: Parameter Studymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Numerical and Experimental Study of a Novel Concept for Hydraulically Controlled Negative Loads

Sørensen¹,

Hansen²,

Ebbesen³

2016

MIC

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Energy Saving Analysis Using Pilot Operated Counter Balance Valve

Sreeharsha

Bhola

Kumar

et al. 2019

Lecture Notes in Mechanical Engineering

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Hybrid State Feedback Position-Force Control of Hydraulic Cylinder

Pasolli

Ruderman

2019

2019 IEEE International Conference on Mechatronics (ICM)

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A hybrid position-force control is proposed using a unified state feedback controller in combination with feedforward dead-zone compensation. Dead-zone compensator was constructed as inverse of the identified static map while the state feedback gains were obtained using a numerical optimization routine. An accurate state-space model affine in states and control, derived in a previous work, was used for closed-loop simulations and control tuning. A trigger event for automatic switching between position and force control was defined and integrated into overall control architecture alongside with a feedforward low-pass filter reducing high frequency components in the control signal. Experimental evaluations were performed for different references with automatic switching between the position trajectory following and force set value regulation.

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Novel concept for stabilising a hydraulic circuit containing counterbalance valve and pressure compensated flow supply

Cited by 10 publications

References 2 publications

Numerical and Experimental Study of a Novel Concept for Hydraulically Controlled Negative Loads

Numerical and Experimental Study of a Novel Concept for Hydraulically Controlled Negative Loads

Energy Saving Analysis Using Pilot Operated Counter Balance Valve

Hybrid State Feedback Position-Force Control of Hydraulic Cylinder

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