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

Nauparac, Dragan; Pršić, Dragan; Miloš, Marko; Todić, Ivana

doi:10.17559/tv-20140621063240

Cited by 12 publications

(7 citation statements)

References 12 publications

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“…This effect of boundary-layer separation and re-circulation zone shaping, fig. 5(a) is well explained in [13,[22][23][24][25]. All of these effects are also accompanied by a considerable increase of the nozzle wall temperature, fig.…”

Section: Flow Simulation Visual Analysissupporting

confidence: 53%

Nozzle flow gas-dynamical properties under dome deflector thrust vector system effect

Boulahbal¹,

Momcilo²,

Rezgui³

2019

THERM SCI

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The paper discusses the gas-dynamical disturbances in the nozzle jet-flow, discovered by numerical simulations, caused by mechanical-shaped jet obstacles, immersed in the exit area of the nozzle flow for thrust vector control purposes. External profiled tab shaped as a dome deflector is used to disturb the flow in the exit area, which provides the comprehensive 3-D nozzle separated flow zones with different high gradients of flow stream parameters. Discovered complexity of the flow pattern in the 3-D nozzle separated zone is exploited by complex CFD simulations and used for the numerical calculations, implemented by FLUENT commercial code. Pressure and temperature distributions data along the nozzle walls, as well as on the deflector wall, are used to estimate induced lateral and thrust forces by pressure integral. Induced forces estimated by numerical simulations and hot gases nozzle tests are compared as relative efficiency values to prove the quality of numerical simulations. Numerical calculations are carried out in the nozzle, obstacle, and the gap flows showed good agreement to the calculated and measured induced forces. The main aim of the developed method is to establish an approved calculation tool to compare and choose thrust vector control possibilities based on tabs with different forms of immersion in the external jets.

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Section: Flow Simulation Visual Analysissupporting

confidence: 53%

Nozzle flow gas-dynamical properties under dome deflector thrust vector system effect

Boulahbal¹,

Momcilo²,

Rezgui³

2019

THERM SCI

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“…6 shows responses acquired from simulation (green) and measurement (red), whereas the pressure set-point is shown in blue. Detailed information related to the simulation is available in the literature [7,13,[15][16][17][18][19][20]. A similar conclusion about the dynamics can be made in the case of the use of a variable axial piston pump set to maximal displacement (VC-APP-drive concept).…”

Section: Frequency Driven Asynchronous Motor and Gear Pump -Vc-drive mentioning

confidence: 87%

Dynamic Behaviour of Different Hydraulic Drive Concepts – Comparison and Limits

Lovrec¹,

Tič²,

Tašner³

2017

Int. j. simul. model.

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Improvement in regard to machine energy efficiency is one of the more important goals throughout all fields of research. This is especially true for hydraulically driven machines with large installed power. The use of the appropriate drive concepts, along with a suitable control concept, can result in quite substantial energy savings. Equipping a hydraulic machine with a speed-variable drive and a variable displacement pump enables maximum efficiency tracking for all operating points, represents the most promising drive concept in regard to energy savings. For each operating point, there is an optimal pump setting; consequently, the hydraulic system is able to ensure hydraulic power with minimum losses if the drive components are selected thoughtfully and the system controlled properly. However, in the desire to maximise the system efficiency, the system's responsiveness is too often overlooked.The paper summarises the principle of different drive concepts, along with the drive controller, in terms of the dynamic response and the drive efficiency. Although the speed-variable drive concepts are the most efficient, they have some disadvantages, which are also presented.

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“…The mathematical model of an elastic pipe or an elastic hydraulic hose is further defined by their Young's modulus of elasticity and Poisson ratio, as indicated in [14,15]. The Matlab SimHydraulics software was selected for the mathematical simulation of a hydraulic system due to physical access and advanced mathematical models [16][17][18][19]. This software is used in order to perform the comparison of the mathematical models of oil as the homogenous substance or the multiphase substance.…”

Section: Introductionmentioning

confidence: 99%