A Novel Model for Optimized Development and Application of Switching Valves in Closed Loop Control

Schepers, Ingo; Schmitz, David; Weiler, Daniel; Cochoy, Olaf; Neumann, Uwe

doi:10.1080/14399776.2011.10781035

Cited by 9 publications

(4 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Due to their response dynamics and the small control error in the desired rest positions, the digital valves are not fully switched anymore, in other words, they act in a so-called ballistic mode. 38 Shrinking a dead band around the desired rest position, an arbitrary accuracy can be achieved, at least theoretically. In practice, the achievable accuracy is mainly influenced by the design of the valves and their dynamic switching, the load pressure, and the sample time of the signal processing unit.…”

Section: Simulations and Discussionmentioning

confidence: 99%

Passivity-based control of a pulse-width mode operated digital hydraulic drive

Kogler

Schöberl

Scheidl

2018

Proceedings of the Institution of Mechanical Engineers, Part I:

View full text Add to dashboard Cite

Section: Simulations and Discussionmentioning

confidence: 99%

Passivity-based control of a pulse-width mode operated digital hydraulic drive

Kogler

Schöberl

Scheidl

2018

Proceedings of the Institution of Mechanical Engineers, Part I:

View full text Add to dashboard Cite

“…The valve opening op can have a value between 0 and 1. Opening and closing dynamics of the valve armature are modeled based on three parameters: 1) delay, 2) movement time, and 3) sticking time as detailed in [22]. This model describes realistically the valve operation in practically any condition.…”

Section: A Simulation Studymentioning

confidence: 99%

Design, Fabrication and Control of an Hydraulic Elastomer Actuator

Kelageri,

Heikkila,

Poikelispaa

et al. 2018

Preprint

View full text Add to dashboard Cite

This paper presents design, fabrication and control of a compliant 2D manipulator, a so called soft actuator. Our focus is on fiber-reinforced elastomer actuators driven by a constant pressure hydraulic supply and modulated on/off valves. For a given diameters, we study the effect of four different elastomer materials and that of number of reinforcement fiber turns on forces generated by the actuator and maximum bending angles. For the rest of the study, we use polydimethylosiloxane (PDMS) with 240 fiber turns per 170 mm length of actuator which withstand highest pressures and forces in our experiments. For the rest of the paper, we introduce two control methodologies. Firstly, we show that is possible to reasonably accurately control the pressure inside tube without measuring the pressure incorporating a simple linear tube model. This can be used, for example, in an inner-outer loop configuration with a PI position control to achieve high performance without the need for pressure measurement. Secondly, we experimentally show that a switching position control exhibits very good steady state accuracy and acceptable transient. Actuator tip position is measured using an external vision system. Our experiments included performance analysis of our soft manipulator while freely moving as well as when carrying a load.

show abstract

“…Possible solutions to replace the traditional 4/3 directional controlled valve used in hydraulic systems to control the motion of an actuator include: (1) Displacement control actuation [11,12], (2) independent metering control [13,14], and (3) digital hydraulics [15][16][17][18]. Each of these solutions has its own strengths and weaknesses.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Design of a Poppet Valve by Transitory Simulation

et al. 2019

View full text Add to dashboard Cite

This article contains the results and analysis of the dynamic behavior of a poppet valve through CFD simulation. A computational model based on the finite volume method was developed to characterize the flow at the interior of the valve while it is moving. The model was validated using published data from the valve manufacturer. This data was in accordance with the experimental model. The model was used to predict the behavior of the device as it is operated at high frequencies. Non-dimensional parameters for generalizing and analyzing the effects of the properties of the fluid were used. It was found that it is possible to enhance the dynamic behavior of the valve by altering the viscosity of the working fluid. Finally, using the generated model, the influence of the angle of the poppet was analyzed. It was found that angle has a minimal effect on pressure. However, flow forces increase as angle decreases. Therefore, reducing poppet angle is undesirable because it increases power requirements for valve actuation.

show abstract

A Novel Model for Optimized Development and Application of Switching Valves in Closed Loop Control

Cited by 9 publications

References 3 publications

Passivity-based control of a pulse-width mode operated digital hydraulic drive

Passivity-based control of a pulse-width mode operated digital hydraulic drive

Design, Fabrication and Control of an Hydraulic Elastomer Actuator

Analysis of the Design of a Poppet Valve by Transitory Simulation

Contact Info

Product

Resources

About