Model Research of Steam Catapult Launch Process for Carrier-based Aircraft

Zhu, Qidan; Lu, Peng; Yang, Zhibo; Cui, Yujia

doi:10.23919/chicc.2018.8483411

Cited by 4 publications

(11 citation statements)

References 1 publication

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“…(10) Carrier-based aircraft has no off-center during catapult launch. (11) The elevator angle is fixed during the whole process of catapult launch. (12) The mass of fuselage, wing and outer cylinder of shock absorber are regarded at nose gear rotation shaft, and use them as elastic support mass [22]; the mass of shock strut, wheel and tire are regarded at wheel axle, and use them as inelastic support mass.…”

Section: Mathematical Model Of Wet Steam Accumulator Parameter Optimimentioning

confidence: 99%

“…The test data of the launch valve are shown in Figure 6. The mass flow rate can be calculated as [11]:…”

Section: Mathematical Model Of Launch Valvementioning

confidence: 99%

“…The equivalent effective cross-sectional area of launch valve and pipe's equation comes from [11], and the pipe is between wet steam accumulator and cylinder:…”

Section: Mathematical Model Of Launch Valvementioning

confidence: 99%

“…The piston in cylinder is in a state of static equilibrium at tensioning. The statics model of piston can be calculated as [11]:…”

Section: Statics Model Of Pistonmentioning

confidence: 99%

“…Shi [10] developed a nested structure of inner and outer cylinders in order to solve the problem of sealing the cylinder of the steam-powered catapult. In order to study the steam catapult launch process for aircraft, Zhu [11] developed a mathematic model of steam catapult launch process for carrier-based aircraft. In the other researches of the catapult launch of carrier-based aircraft, the off-center catapult launch [12,13] of carrier-based aircraft can excite directional oscillations; the nose gear jump strut [14,15] can reduce takeoff ground roll distance of short takeoff and landing (STOL) aircraft [16]; the catapult launch control law logic [17,18] can give the safe guarantee in the catapult launch process; carrier suitability test [17,19,20] was used to test and evaluate carrier-based aircraft.…”

Section: Introductionmentioning

confidence: 99%

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Multi-Parameter Optimization for the Wet Steam Accumulator of a Steam-Powered Catapult

Zhu

Yang

et al. 2019

Energies

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Selecting the optimal parameters for wet steam accumulator of steam-powered catapult is an important task, due to launching safety. There is no literature on the topic of the parameters optimization for wet steam accumulator of steam-powered catapult. The genetic algorithm (GA) was used to determine the optimal wet steam accumulator in this article. The sink-off-the-bow (SOB), angle of attack and rate of climb were used to create the objective function. The multi-objective optimization can be converted to single-objective optimization, which is subject to angle of attack and rate of climb. Moreover, the simulation model of the steam catapult system was built by creating a thermodynamics model of steam-powered catapult, a mathematical model of traction release device, a statics model of tensioning, a statics model of full takeoff power, a mathematical model of catapult force build-up with holdback, a model of release, a dynamics model of power stroke, a dynamics model of free deck run and a dynamics model of fly away. Finally, the optimal combination of the wet steam accumulator was obtained via numerical simulation. The GA method can effectively find the optimal parameters of wet steam accumulator, and its optimized parameters can increase the safety of catapult launch process.Steam-powered catapult launch system for carrier-based aircraft is mainly made up of steam-powered catapult, the traction release device and aircraft, and its simplified model is shown in Figure 1. A steam-powered catapult consists of a wet steam accumulator, a launch valve, two cylinders, two pistons, a shuttle, a water brake and a retraction system. The traction release device mainly consists of a launch bar and holdback bar.

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Section: Mathematical Model Of Wet Steam Accumulator Parameter Optimimentioning

confidence: 99%

“…The test data of the launch valve are shown in Figure 6. The mass flow rate can be calculated as [11]:…”

Section: Mathematical Model Of Launch Valvementioning

confidence: 99%

“…The equivalent effective cross-sectional area of launch valve and pipe's equation comes from [11], and the pipe is between wet steam accumulator and cylinder:…”

Section: Mathematical Model Of Launch Valvementioning

confidence: 99%

“…The piston in cylinder is in a state of static equilibrium at tensioning. The statics model of piston can be calculated as [11]:…”

Section: Statics Model Of Pistonmentioning

confidence: 99%