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  • Military Aircraft, UAV’s and Missiles » Aircraft Research Association
    Store Separation Stability and Control Intake Performance Installed Store Loads Isolated Store Loads Data Quality and Repeatability Productivity Customer Facilities Other Test Facilities Balance Calibration Laboratory Mach Simulation Tank Propeller Test Cell Small Scale Transonic Tunnel 2 Dimensional Tunnel Large Scale Thrust Measuring Rig New Page zh 设计与制造 CAD Design Services Precision Model Manufacture Inspection Services Finite Element Analysis Strain Gauge Balance Design and Manufacture 计算流体动力学 CFD Software Code Development CFD Software Code Application Applied Aerodynamics Integrated CFD Wind Tunnel Weapons and Weapon Bay Analysis Wing Design Process Aerodynamic Research 创新与技术 Clean Sky Project Strain Gauge Balance Developments Pressure Sensitive Paint Model Deformation Measurement New Page zh Media Centre Image Library Video Gallery Document Downloads Newsletter Registration Careers Vacancies New Page zh New Page zh New Page zh New Page zh Benefits Apprentices Personal Experiences Graduates Industrial Placements Work Experience Contact Military Aircraft UAV s and Missiles Aircraft Research Association 服务 实验空气动力学 Transonic Wind Tunnel Testing Military Aircraft UAV s and Missiles Simulating the operational envelope of a combat aircraft and the deployment of a missile requires the development of a comprehensive range of wind tunnel test techniques Here the accurate simulation of the air vehicle s aerodynamic performance can be the critical difference between its mission s success and failure ARA has worked on some of the World s most demanding military aircraft and weapons programs and received awards from our customers in recognition for the notable contributions we have made to the success of these projects The aircraft that ARA has worked on include Tornado Harrier T 50 Typhoon and F 35 We have worked closely with the World s leading aircraft and weapon manufacturers on the development and integration of stores such as Brimstone Amraam and Meteor As the operational envelope of unmanned and remotely piloted air

    Original URL path: http://www.ara.co.uk/zh/services/page-11/transonic-wind-tunnel-testing/military-aircraft-uavs-and-missiles/ (2016-02-17)
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  • Store Separation » Aircraft Research Association
    before a new store such as a missile or a fuel tank can be used in service on an aircraft These tests are used to ensure that a store on release is able to clear the parent aircraft safely without endangering the aircraft or pilot ARA has developed the Two Sting Rig TSR system which we believe to be the most accurate system to meet this requirement in the world with its unique store release simulation capability Using this positional accuracies can be measured to within 0 05 inches or 1 25mm The TSR system achieves this level of accuracy through monitoring the relative positions of lights mounted in known positions on the store and aircraft using a calibrated camera system Using this system allows ARA to add value in the area of store release testing due to efficient and accurate testing especially when compared with the expensive alternative of flight testing The TSR has been used at ARA since 1979 and has been used to support store integration programs in a wide variety of production and developmental aircraft including Stormshadow Raptor and Brimstone integration on Tornado and Harrier in the UK International customers include Saab Scania with Gripen KAI with the T 50 and Lockheed Martin with the F 16 Why ARA If a customer works with ARA they can take advantage of Stores positioned in location and attitude with superb accuracy levels Pitch Yaw 0 15 Y Z 0 15mm Store movement is continuous allowing for excellent productivity for example up to 15 trajectories up to 30 grids grid survey test technique and up to 20 traverses freestream traversing technique per hour is possible Decades of experience testing a wide range of stores and aircraft Efficient test campaigns all set up data validated before entry into the wind

    Original URL path: http://www.ara.co.uk/zh/services/page-11/transonic-wind-tunnel-testing/military-aircraft-uavs-and-missiles/store-separation/ (2016-02-17)
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  • Stability and Control » Aircraft Research Association
    zh New Page zh New Page zh Benefits Apprentices Personal Experiences Graduates Industrial Placements Work Experience Contact Stability and Control Aircraft Research Association 服务 实验空气动力学 Transonic Wind Tunnel Testing Military Aircraft UAV s and Missiles Stability and Control Most modern fighter aircraft have been designed with some degree of inherent aerodynamic instability requiring close control by fly by wire computers Therefore it is vitally important that the stability and control aerodynamics of the aircraft are fully understood throughout the flight envelope at all speeds attitudes and payload combinations as these data form the basis of the flight control software systems It is important to acquire stability and control data for a large number of store payloads to provide sufficient data for aircraft flight control systems The safety of the aircraft and crew are therefore dependent on the fidelity of the aerodynamic data base For military aircraft control panel loads determination is also important since control panel loadings are affected by the payload carried on the aircraft more especially by external stores Loads on various control panels may be derived either directly by use of panel balances or by measuring pressures on the upper and lower surfaces of the panel and integrating these data Why ARA ARA has many years of experience in the measurement of stability and control aerodynamic data for a wide variety of military aircraft throughout the global market including Tornado and Typhoon This has enabled highly accurate stability and control data acquisition methods to be developed coupled with excellent productivity Individual control panel loads may also be measured simultaneously with the overall stability and control loads ARA has extensive experience in the measurement of payload forces and moments for both individual stores and multiple stores on racks launchers etc This experience has enabled ARA to couple stability

    Original URL path: http://www.ara.co.uk/zh/services/page-11/transonic-wind-tunnel-testing/military-aircraft-uavs-and-missiles/stability-and-control/ (2016-02-17)
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  • Intake Performance » Aircraft Research Association
    服务 实验空气动力学 Transonic Wind Tunnel Testing Military Aircraft UAV s and Missiles Intake Performance The intakes of the vehicle i e aircraft cruise missile etc deliver the air to the engines It is important that the air flowing into any engine is well behaved so that the engines operate efficiently and reliably with minimal maintenance The intakes must retain optimal functionality throughout the operational envelope whatever the speed or attitude of the vehicle Why ARA ARA has extensive experience in the design and manufacture of bespoke ejectors and engine face rakes together with appropriate intake models and support structures We also have an on site intake duct calibration facility the Mach Simulation Tank It can be used to calibrate model engine nacelle duct intake thrust and discharge coefficients over the range of pressure ratios experienced in both the Transonic Wind Tunnel and a quiescent environment This facility may also be used to check the operation of engine face rakes Due to the dynamic nature of air flow a high speed data acquisition system is also vital ARA has a bespoke system for the acquisition of high speed steady state and dynamic data in real time during testing Coupled with real time data reduction techniques this system provides immediate access to the results of pressure recovery and distortion using the ARA data monitoring system A Typical Test An intake test involves the design and manufacture of a model of an appropriate section of the vehicle to be tested for an aircraft this might be the forward fuselage only whilst for a missile it may consist of most of the fuselage and the wings in the appropriate deployed position Integrated into this model is an ejector powered by a supply of high pressure air which induces the required air flow through the

    Original URL path: http://www.ara.co.uk/zh/services/page-11/transonic-wind-tunnel-testing/military-aircraft-uavs-and-missiles/intake-performance/ (2016-02-17)
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  • Installed Store Loads » Aircraft Research Association
    Registration Careers Vacancies New Page zh New Page zh New Page zh New Page zh Benefits Apprentices Personal Experiences Graduates Industrial Placements Work Experience Contact Installed Store Loads Aircraft Research Association 服务 实验空气动力学 Transonic Wind Tunnel Testing Military Aircraft UAV s and Missiles Installed Store Loads Installed stores are items like fuel tanks and weapons which are carried by the aircraft externally on pylons or in internal weapon bays The very complicated nature of the airflow around an aircraft and the stores that are attached to it means that wind tunnel tests remain an important part of most store integration programs Wind tunnel tests provide the large quantities of high quality data needed to provide store loads throughout the aircraft s operational envelope with speed and reliability For some full models the use of an internally mounted balance is not possible i e models with full ducted air flow where there is insufficient room remaining within the model to house a suitable balance In these cases the pressure measuring method is utilised to acquire sufficient data to enable loads to be obtained by integrating pressures over the whole model or indeed for individual portions of the model Wind tunnel tests provide the high quality balance or pressure data depending on the methodology used needed to determine the loads on the overall model or control panels Why ARA We have a world leading capability in the manufacture of stores support mechanisms and balances completed to the very highest standards including bespoke stores with free floating seeker heads and with spring loaded free floating canards or fins ARA is also a world leader in the provision of small panel balances together with many years of experience in the use of pressure measurement techniques for overall models and control panel loads Typical Tests

    Original URL path: http://www.ara.co.uk/zh/services/page-11/transonic-wind-tunnel-testing/military-aircraft-uavs-and-missiles/installed-store-loads/ (2016-02-17)
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  • Isolated Store Loads » Aircraft Research Association
    Store Loads Data Quality and Repeatability Productivity Customer Facilities Other Test Facilities Balance Calibration Laboratory Mach Simulation Tank Propeller Test Cell Small Scale Transonic Tunnel 2 Dimensional Tunnel Large Scale Thrust Measuring Rig New Page zh 设计与制造 CAD Design Services Precision Model Manufacture Inspection Services Finite Element Analysis Strain Gauge Balance Design and Manufacture 计算流体动力学 CFD Software Code Development CFD Software Code Application Applied Aerodynamics Integrated CFD Wind Tunnel Weapons and Weapon Bay Analysis Wing Design Process Aerodynamic Research 创新与技术 Clean Sky Project Strain Gauge Balance Developments Pressure Sensitive Paint Model Deformation Measurement New Page zh Media Centre Image Library Video Gallery Document Downloads Newsletter Registration Careers Vacancies New Page zh New Page zh New Page zh New Page zh Benefits Apprentices Personal Experiences Graduates Industrial Placements Work Experience Contact Isolated Store Loads Aircraft Research Association 服务 实验空气动力学 Transonic Wind Tunnel Testing Military Aircraft UAV s and Missiles Isolated Store Loads Isolated stores are items which are separated from a parent aircraft they range from fuel tanks and missiles to ejector seats deployed parachutes and flight refuelling probes Understanding of the aerodynamic loads on these stores is required for many purposes which depend on the nature of the store examples include the development of flight control systems for a missile or to ensure the safety of an ejector seat Wind tunnels can be used for full scale and near full scale testing of isolated stores in a controlled environment prior to flight test For stores with complicated airflows wind tunnels can provide large quantities of high quality data to validate numerical simulations Why ARA ARA offers a one stop service for customers starting with the design and manufacture of stores and balances followed by gauging and calibration of balances and finishing with a test program in our Transonic Wind Tunnel

    Original URL path: http://www.ara.co.uk/zh/services/page-11/transonic-wind-tunnel-testing/military-aircraft-uavs-and-missiles/isolated-store-loads/ (2016-02-17)
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  • Data Quality and Repeatability » Aircraft Research Association
    Page zh Media Centre Image Library Video Gallery Document Downloads Newsletter Registration Careers Vacancies New Page zh New Page zh New Page zh New Page zh Benefits Apprentices Personal Experiences Graduates Industrial Placements Work Experience Contact Data Quality and Repeatability Aircraft Research Association 服务 实验空气动力学 Transonic Wind Tunnel Testing Data Quality and Repeatability The increasing demand for high quality data and comparisons of detailed differences between configurations means that data quality and repeatability must be maintained for all forms of testing To achieve this objective it is essential to have a very thorough understanding of the quality of flow in a tunnel and to be able to monitor and attain very high standards of repeatability of data measurement As part of our ISO 9001 2000 QA Certification ARA ensures that the highest of standards of data quality for our wind tunnels are maintained This is achieved through the use of a calibration procedure which provides a continuous monitoring of data quality by use of A reference databank of flow angularity measurements formed from all models tested which enables values computed for new similar models to be verified A reference model to provide a means of demonstrating repeatability not just of data measurement but also of the complete wind tunnel testing process A centreline calibration probe to measure longitudinal Mach number distributions in the wind tunnel A rotating flow survey rig fitted with alternative probes to measure flow angularity and unsteadiness Data Quality From the measurements made in the ARA transonic wind tunnel using the centre line calibration probe and the rotating flow survey rig the set of statements given below can be made regarding flow uniformity throughout the working section ARA TWT Flow Uniformity Mach Number Variation 0 0005 Subsonic fan only 0 0010 Subsonic auxiliary suction typically M 0

    Original URL path: http://www.ara.co.uk/zh/services/page-11/transonic-wind-tunnel-testing/data-quality-and-repeatability/ (2016-02-17)
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  • Productivity » Aircraft Research Association
    and Missiles Store Separation Stability and Control Intake Performance Installed Store Loads Isolated Store Loads Data Quality and Repeatability Productivity Customer Facilities Other Test Facilities Balance Calibration Laboratory Mach Simulation Tank Propeller Test Cell Small Scale Transonic Tunnel 2 Dimensional Tunnel Large Scale Thrust Measuring Rig New Page zh 设计与制造 CAD Design Services Precision Model Manufacture Inspection Services Finite Element Analysis Strain Gauge Balance Design and Manufacture 计算流体动力学 CFD Software Code Development CFD Software Code Application Applied Aerodynamics Integrated CFD Wind Tunnel Weapons and Weapon Bay Analysis Wing Design Process Aerodynamic Research 创新与技术 Clean Sky Project Strain Gauge Balance Developments Pressure Sensitive Paint Model Deformation Measurement New Page zh Media Centre Image Library Video Gallery Document Downloads Newsletter Registration Careers Vacancies New Page zh New Page zh New Page zh New Page zh Benefits Apprentices Personal Experiences Graduates Industrial Placements Work Experience Contact Productivity Aircraft Research Association 服务 实验空气动力学 Transonic Wind Tunnel Testing Productivity Productivity for Aircraft and Isolated Store Models The productivity of wind tunnel testing can be measured in terms of the number of configurations or builds that are tested in a day and the number of polars for which data is measured in a day The absolute amount of each of these that can be achieved will be dependent upon the precise details of a test programme The figures given in the table below show the high levels of productivity that can be achieved typically within the ARA transonic wind tunnel for both the continuous and pitch pause model movement approaches Typical Productivity Levels Type of Model Movement Configurations per hour Continuous 10 Pitch Pause 4 Productivity for Store Release Testing Typically a store release test will be composed of taking data for a number of trajectories of the store from the parent aircraft and a number

    Original URL path: http://www.ara.co.uk/zh/services/page-11/transonic-wind-tunnel-testing/productivity/ (2016-02-17)
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