Computer Simulation of the Bi-Stable Valve in the A340 Landing Gear

1996 ◽  
Vol 210 (3) ◽  
pp. 261-270
Author(s):  
D G Tilley ◽  
S P Tomlinson
Keyword(s):  
Computer Simulation ◽  
Flight Control ◽  
Landing Gear ◽  
Original Design ◽  
Model Library ◽  
Areas Of Interest ◽  
Actuation Systems ◽  
Component Models ◽  
High Degree ◽  
Simulation Package

The increasing use of simulation for both circuit and component analysis in the aircraft industry has come about due to the requirement for acceptable transient as well as steady state performance of aircraft systems. The computer simulation package, Bathfp, developed at the Fluid Power Centre, University of Bath, is suitable for investigations into both of these. Utilities are provided which allow a model of a complicated system or component to be built up from its elements, which can be introduced to the model library of components so that particular dedicated areas of interest such as flight control actuation systems and braking and landing gear may be examined in detail. Component models enable the internal details of valves, pumps, motors, actuators and other elements to be simulated to a high degree of accuracy. This paper describes the application of the simulation package to perform a detailed analysis of the bi-stable valve in the A340 landing gear shock absorber. In the original design, a malfunction of the valve during impact on landing was clearly identified by an experimental test. Parametric variations are made in the simulation to identify the possible cause of the malfunction.

Research of the process of distributing the middle part of tubular blanks

2020 ◽  
Author(s):  
S.B. Maryin ◽  
D.A. Potyanikhin ◽  
Wai Aung Phyo ◽  
Ko Hlaing Min
Keyword(s):  
Flight Control ◽  
Expansion Ratio ◽  
Middle Part ◽  
Landing Gear ◽  
Cold Plastic Deformation ◽  
Tensile Stresses ◽  
Wheel Turn ◽  
Air Brakes ◽  
Working Bodies ◽  
High Degree

A significant problem in the aircraft industry remains the production of reliable hydro-gas systems, such as flight control, landing gear retraction and release, wheel turn control of the front landing gear, control of air brakes and spoilers, engine thrust reversal control, et al., providing a high degree of performance and reliability. The article discusses the technological processes of manufacturing parts for hydro-gas systems of aircraft. Research has been carried out on the expansion of the middle part of thin-walled tubular billets by cold plastic deformation, which showed that the most dangerous is the middle part of the considered part of the billet, where there are significant tensile stresses. The reduction in tensile stresses that occurs when creating an ice retainer allows to increase in the expansion ratio. The application of new types of working bodies is proposed for transferring pressure to the deformation zone.

Computer Simulation for Ergonomic Bus Operator Workstation Design With Validation

1998 ◽  
Author(s):  
H. You ◽  
B. Oesterling ◽  
B. Lowe ◽  
B. J. Gilmore ◽  
A. Freivalds
Keyword(s):  
Computer Simulation ◽  
The Body ◽  
Medium Size ◽  
Kinematic Constraints ◽  
Test Track ◽  
Human Models ◽  
Workstation Design ◽  
Body Joints ◽  
Bus Operator ◽  
Simulation Package

Abstract Bus operator’s workstations neglecting ergonomic features can cause overall discomfort and injuries to the users. This paper presents use of JACK®, a human work simulation package, in designing and evaluating a bus operator workstation which can provide sufficient visibility, natural reach, and comfortable posture for operators who range from the 5th percentile female to the 95th percentile male as defined by SAE J833 (SAE, 1994). Three human models representing the two extremes and their medium size person were created and performed 15 bus operating tasks on the bus workstation implemented in JACK®. Kinematic constraints were defined between the human models and the workstation to simulate the tasks in a realistic manner. While the human models simulated the tasks, the body joints were monitored to determine if they exceeded their comfort ranges recommended by Diffrient et al. (1981) and the workstation was evaluated in terms of visibility, reach, comfort, and adjustability. After the workstation design was refined by iterative modifications and the required component adjustment ranges were determined, the workstation design was prototyped into an actual working bus. A jury of bus operators evaluated the workstation design by operating the prototype on a test track. The response from the operators indicated that the workstation would accommodate the intended population.

Numerical Analysis of the Acoustical Quality of a Multi-Purpose Hall

1995 ◽  
Vol 2 (3) ◽  
pp. 487-500 ◽  
Author(s):  
X.W. Meng ◽  
G. De Borger ◽  
M. Van Overmeire
Keyword(s):  
Computer Simulation ◽  
Sound Pressure Level ◽  
Decay Time ◽  
Sound Pressure ◽  
Field Measurements ◽  
Pressure Level ◽  
Energy Fraction ◽  
Experimental Values ◽  
Simulation Package

In this paper, the acoustical features are described of a multi-purpose auditorium of the Free University of Brussels which were investigated both with field measurements and computer simulation. The convergence of the algorithm of the simulation package RAYNOISE was investigated as a function of the influence on the calculated results of the choice of the number of rays and the reflection order. By comparing the numerical and experimental values of the sound pressure level and early decay time, it is demonstrated that sufficiently accurate acoustical models can be developed. Based on these models, acoustical quantities such as the early energy fraction, sound pressure level, early decay time and early lateral energy fraction were calculated and employed to evaluate the acoustical quality of this multi-purpose hall.

scholarly journals MODELAGEM, SIMULAÇÃO E OTIMIZAÇÃO DA DINÂMICA OPERACIONAL DO PROCESSO DE ATENDIMENTO DE UM PEQUENO POSTO DE SAÚDE

e-xacta ◽  
2013 ◽  
Vol 6 (1) ◽  
pp. 101
Author(s):  
José Airton Azevedo dos Santos ◽  
Tiago C. Dal’sotto ◽  
Wesley Schroeder
Keyword(s):  
Computer Simulation ◽  
Appointment Scheduling ◽  
Quantitative Character ◽  
Health Post ◽  
Waiting Room ◽  
Optimization Software ◽  
Simulation And Optimization ◽  
Medical Appointment ◽  
West Region ◽  
Simulation Package

<p>Este trabalho tem como objetivo analisar, através de técnicas de simulação e de otimização, a dinâmica operacional do processo de atendimento de um pequeno posto de saúde localizado na região oeste paranaense. A simulação e a otimização foram executadas utilizando o pacote de simulação Arena®, que inclui o software de otimização Optquest. A metodologia utilizada é a de modelagem através de simulação computacional, de caráter quantitativo e é caracterizada como participativa. A aplicação destas técnicas em conjunto resultaram na otimização do número de agendamento de consultas médicas do posto de saúde.</p><p>Abstract</p><p>This work aims to analyze the attending process operational dynamics of a small health post located in Paraná West Region. Another objective is connect the concepts of simulation and optimization to maximize the number of scheduling appointments for the health post, within the limits of accommodation of the waiting room. The simulation and optimization were performed using the Arena ® simulation package, which includes the OptQuest optimization software. The methodology used was the modeling through computer simulation of quantitative character and it is characterized as participative. The application of these techniques all together resulted in the optimization of the number of medical appointment scheduling of the health post</p>

Editorial on Future Jet Technologies

2014 ◽  
Vol 31 (4) ◽  
Author(s):  
Benjamin Gal-Or
Keyword(s):  
Flight Control ◽  
Landing Gear ◽  
Engineering Practice ◽  
Mobile Telecommunication ◽  
Fighter Aircraft ◽  
Thrust Vectoring ◽  
Jet Engine ◽  
Stealth Technology ◽  
Forced Landing ◽  
Expected Benefits

AbstractThe jet engine is the prime flight controller in post-stall flight domains where conventional flight control fails, or when the engine prevents catastrophes in training, combat, loss of all airframe hydraulics (the engine retains its own hydraulics), loss of one engine, pilot errors, icing on the wings, landing gear and runway issues in takeoff and landing and in bad-whether recoveries. The scientific term for this revolutionary technology is “jet-steering”, and in engineering practice – “thrust vectoring”, or “TV”.Jet-Steering in advanced fighter aircraft designs is integrated with stealth technology. The resulting classified Thrust-Vectoring-Stealth (“TVS”) technology has generated a second jet-revolution by which all Air-&-Sea-Propulsion Science and R&D are now being reassessed.ClassifiedOne, and perhaps a key conclusion presented here, means that bothMobile telecommunication of safe links between flyers and combat drones (“UCAVs”) at increasingly deep penetrations into remote, congested areas, can gradually be purchased-developed-deployed and then operated by extant cader of tens of thousandsWe also provide 26 references [17–43] to a different, unclassified technology that enhances TV-inducedExpected benefits include anti-terror recoveries from emergencies, like forced landing on unprepared runways or highways, or recoveries from all airframe-hydraulics-outs, asymmetric ice on wings, landing gear catastrophes, and recoveries from pilot errors and bad-whether incidents [Rule 9(7)].

Modeling and Performance Simulation for a Picking Manipulator Based on Modelica

2013 ◽  
Vol 579-580 ◽  
pp. 467-475 ◽  
Author(s):  
Hong Jun Wang ◽  
Guo Gang Huang ◽  
Xiang Jun Zou ◽  
Yan Chen
Keyword(s):  
Structure Design ◽  
The Body ◽  
Body Structure ◽  
Performance Simulation ◽  
Model Library ◽  
Drive Motor ◽  
The Laplace Transform ◽  
And Performance ◽  
Component Models ◽  
Module Partition

This paper presents a procedure and the results of structure design about a picking manipulator to be used for autonomous banana harvesting. Based on structure analysis and module partition for the picking manipulator, DriveLib model library was developed employing the virtual simulation and modeling language Modelica. A body structure model for the picking manipulator was established based on component models in DriveLib model library. Motion controls mathematic models for the picking manipulator were analyzed according to drive motor performance for the body structure, and then the partial differential equations were transformed into the ordinary differential equation easily solved by Modelica with the Laplace transform, mechanical motion simulation was realized. The validity models could provide a theoretical basis for picking banana manipulator primary design.

Challenges for Health Monitoring of Electromechanical Flight Control Actuation Systems

2011 ◽  
Vol 4 (2) ◽  
pp. 1316-1323 ◽  
Author(s):  
Hannes Wagner ◽  
Galin Nikolov ◽  
Andreas Bierig ◽  
Holger Spangenberg
Keyword(s):  
Health Monitoring ◽  
Flight Control ◽  
Actuation Systems
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