Unified modeling and analysis of a proportional valve

Eryilmaz, Bora; Wilson, Bruce H.

doi:10.1016/j.jfranklin.2005.07.001

Cited by 70 publications

(38 citation statements)

References 8 publications

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“…Basic actuator system is being observed as positional, but the change in force is being observed when the piston rod speed changes in load cylinder. On electro-hydraulic actuator, load is simulated via cylinder that is connected to actuator cylinder [21]. Having this set up, there is a possibility to load an actuator cylinder with adequate forces (variable load) at given speed of actuator system.…”

Section: Flexible Nozzle Actuator's Loadmentioning

confidence: 99%

Different modeling technologies of hydraulic load simulator for thrust vector control actuator

Nauparac¹,

Pršić²,

Miloš

et al. 2015

Teh. vjesn.

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Original scientific paper Hydraulic simulators are extremely important in the flight control actuator system's verification process. Flexible nozzle has a number of specifics, comparing to other flight controls, because the load cannot be described, classically, by the hinge moment. Additionally, classical hydraulic simulator, in which the cylinder simulates the load, is not sufficient for performing a complete simulation of the real load. Building a mechanical pendulum, to which a hydraulic cylinder acts, and that rests on two elastic supports, enables simulation of additional phenomena that exist in flexible nozzle, but not in other control surfaces. Force from impulse that exists in reality, and which is impossible to be generated by standard hydraulic simulator, can be realized through the pendulum. This paper demonstrates that a simulator can be designed through modelling of the elastic load using bond graph, without a precise elaboration of direction of forces in elastic structure, just by observing, on energy level, the input of force in flexible structure over the point in which actuator force acts. Simulator with hydraulic cylinder is convenient to be used when there is a need for considering the risk of self-oscillation of flexible joint and nozzle, i.e. for defining the so-called notch filter. Then, the hydraulic cylinder of load simulator can generate the oscillation, frequency and amplitude that match this dynamic case of flexible nozzle actuator's load that is being reduced to its piston rod, without a risk of damaging the flexible structure that exists in the construction of a simulator with pendulum. Keywords: bond graph modelling; electro-hydraulic actuator; flexible nozzle; load simulator; servo-distributor Različite tehnologije modeliranja hidrauličkog simulatora opterećenja aktuatora za upravljanje vektorom potiskaIzvorni znanstveni članak Hidraulički simulatori su posebice važni u procesu verifikacije aktuacijskog sustava za kontrolu leta. Fleksibilni mlaznik ima niz specifičnosti u odnosu na druge komande leta, jer se opterećenje ne može opisati na klasičan način preko zglobnog momenta. Pored toga, klasičan hidraulički simulator, na bazi cilindra koji simulira opterećenje, nije dovoljan za potpunu simulaciju realnog opterećenja. Potrebno je napraviti mehaničko njihalo na koje deluje hidraulički cilindar i koje se oslanja na dva elastična oslonca kako bi se mogle simulirati i dopunske pojave koje postoje kod fleksibilnog mlaznika, a koji ne postoje kod drugih upravljačkih površina. Preko njihala se može zadati impulsna sila koja postoji u realnosti, a koju nije moguće generirati standardnim hidrauličkim simulatorom. U članku se pokazuje da se modeliranjem elastičnog opterećenja preko bond grafova simulator može projektirati bez preciznog razmatranja smjerova i pravaca sila u elastičnoj strukturi, već se samo energetski promatra unošenje sile u fleksibilnu strukturu preko mjesta djelovanja aktuacijske sile. Simulator s hidrauličkim cilindrom je pogodan u slučaju kad treba razmotriti rizik od ...

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Section: Flexible Nozzle Actuator's Loadmentioning

confidence: 99%

Different modeling technologies of hydraulic load simulator for thrust vector control actuator

Nauparac¹,

Pršić²,

Miloš

et al. 2015

Teh. vjesn.

View full text Add to dashboard Cite

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“…In this case the disturbance is not measurable so an observer is used. Additionally, Pan and Do build their system model to include a proportional control valve which, due to a flow across the valve being proportional to ffiffiffiffiffiffiffi ΔP p where ΔP is the pressure drop across the valve, the system is inherently nonlinear (Eryilmaz and Wilson, 2006). Although the system could be linearized, Pan and Do chose to apply a nonlinear control scheme using Lyapunov's direct method.…”

Section: Controlmentioning

confidence: 99%

A review of vertical motion heave compensation systems

2015

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“…Valve dynamics are often modeled as second order systems as it closely resembles the dynamics up to its eigenfrequency Tørdal and Klausen (2013); Bak and Hansen (2012). Eryilmaz and Wilson (2006) developed a nonlinear mathematical model for a generic proportional control valve which should be usable for a variety of different control valves if the geometry is known. Valdés et al (2008) made a CFD model of a ABS NO valve in order to extract valve flow during different pressures and openings.…”

Section: Introductionmentioning

confidence: 99%

Experimental System Identification and Black Box Modeling of Hydraulic Directional Control Valve

Tørdal¹,

Klausen²,

Bak³

2015

MIC

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Directional control valves play a large role in most hydraulic systems. When modeling the hydraulic systems, it is important that both the steady state and dynamic characteristics of the valves are modeled correctly to reproduce the dynamic characteristics of the entire system. In this paper, a proportional valve (Brevini HPV 41) is investigated to identify its dynamic and steady state characteristics. The steady state characteristics are identified by experimental flow curves. The dynamics are determined through frequency response analysis and identified using several transfer functions. The paper also presents a simulation model of the valve describing both steady state and dynamic characteristics. The simulation results are verified through several experiments.

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Unified modeling and analysis of a proportional valve

Cited by 70 publications

References 8 publications

Different modeling technologies of hydraulic load simulator for thrust vector control actuator

Different modeling technologies of hydraulic load simulator for thrust vector control actuator

A review of vertical motion heave compensation systems

Experimental System Identification and Black Box Modeling of Hydraulic Directional Control Valve

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