J2 Universal Features Advantages Benefits


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A Description of the Component parts of the J2 Universal Tool-Kit, and how each provides unique benefits into the aircraft design , build and certification process.

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J2 Universal Features Advantages Benefits

  1. 1. The J2 Universal Tool-Kit - Features Advantages and Benefits AIRCRAFT MODELLING AND PERFORMANCE PREDICTION SOFTWARE Key Aspects RAPID BUILDING OF AIRCRAFT MODELS Replicating the Aircraft Any Stage/Any Data OPTIMISING THE DESIGN Considering all the Options CERTIFYING THE AIRCRAFT Start Certifying Right at the Beginning Classical Analysis Supporting Flight Test AUTOMATIC FLIGHT CONTROL SYSTEM DESIGN Developing Autopilots and Fly-By-Wire COMPLETE UNDERSTANDING Visualising and Viewing the Results SIMULATION Fly the Design straight of the drawing board PUTTING IT ALL TOGETHER The whole is greater than the sum of the parts .
  2. 2. RAPID BUILDING OF AIRCRAFT MODELS Replicating the Aircraft J2 Builder is the main plug-in used for constructing aircraft models. This enables engineers to build the models to replicate the aircraft structure so that the model building is easier and more logical. The construction of the aircraft model follows a logical process working with known information of the aircraft from the first sketch or drawing. This has further advantages in terms of locating and editing data. This can save significant time when comparing to other options. The user no longer has to search through multiple text files or FORTRAN code to try to find the appropriate parameter. Logical Structure for Aircraft Models When Building models in Matlab/Simulink it is necessary to create multiple layers of systems and subsystems, leading to a complex structure and hiding scripts and details that should be easily accessible Furthermore, there is no need for engineers to enter information relating to coupled effects etc. The user can simply enter the aerodynamic, mass or thrust characteristics of a component and its location, and the J2 Universal Tool-Kit will total up all the contributions to work out total forces and moments. This makes the investigation of different loadings, engine scenarios etc. automatic within the software. No need to have Complex Models Described using FORTRAN Code The net result of this is a much simpler and easier to use tool for assembling models with complete visibility of all data. THIS IS ABLE TO REDUCE THE TIME TAKEN TO CONSTRUCT AN AIRCRAFT MODEL FROM OVER 1 MONTH TO LESS THAN 1 WEEK. J2 Builder removes the need for Complex Embedded Subsystems with Matlab
  3. 3. Any Stage/Any Data The main reason modelling and simulation is not used early on in the lifecycle is that engineers believe that they require lots of detailed information before they can start to simulate the aircraft. With the J2 Universal Tool-Kit and J2 Elements, that is not the case. J2 Elements can take data from simple wing and empennage geometry and start to fly the aircraft. This can come from the original 3-View and some basic easily available airfoil information or from more detailed wind tunnel analysis. Starting with a Basic 3-View THESE QUICK AND EASY METHODS PROVIDE A VERY EARLY INSIGHT INTO THE AIRCRAFT BEHAVIOUR. This can then be used to refine the design until more detailed information is available. e.g. Imports from CAD systems etc. At each stage through the design lifecycle, more data is generated regarding the Instantly Visualise the Behaviour aircraft, and this can be simply merged and updated with existing models to provide higher fidelity results. Eventually, the aircraft will reach manufacture, with detailed control system solutions. These too can be linked into the aircraft model to provide detailed real hardware/software in the loop testing through J2 Developer. THE J2 UNIVERSAL TOOL-KIT IS CAPABLE OF SUPPORTING THE DESIGN AND DEVELOPMENT CYCLE FROM CONCEPT TO COMPLETION. THERE IS NO NEED TO PURCHASE OTHER TOOLS AS THE PROJECT Graphically Connect Airborne Software into the Model DEVELOPS. for Increased Fidelity
  4. 4. OPTIMISING THE DESIGN Considering all the Options Being able to build a single model quickly already gives significant advantages in the process of modelling and simulation. However, it is unlikely that the first option considered is the correct solution. To this end it is necessary to perform trade studies and optimisation. If considering different options with the classical text file approach, the easiest way is to take a copy of the original design, and then make modifications. This presents 2 problems. 1) The changes required may require changes to many different aspects of data stored within the file. This approach is prone to error as areas get overlooked or the data is incorrectly adjusted due to lack of visibility of the complete picture. 2) If the original idea is modified, so the user has to go into the alternatives to make the same changes. Changing a Single Number Gives an aircraft with a different Fuselage Length and Tail Position With such a lengthy approach combined with the potential for errors, numerous options are not always considered. With the J2 Universal Tool-Kit investigating numerous options, modifications and variations are not a problem. The J2 Universal Tool-Kit and J2 Builder provide the ability to create delta models. The delta models are a reference back to the original aircraft, and the user only needs to add the changes. This instantly reduces the work required to look at variation. REDUCE WIND TUNNEL TIME THROUGH THE ABILITY TO CONSIDER THE IMPACT OF ALL CHANGES ON PERFORMANCE AND BEHAVIOUR Instantly View and Compare the Impact of the Change Furthermore, if the baseline model is modified, the delta model is automatically updated requiring no user intervention. This can significantly reduce the potential for errors. This means that the user can continually evaluate multiple options. THE DESIGN TEAM CAN EVALUATE MORE OPTIONS AND IDEAS IN HALF THE TIME USING THE OUT OF THE BOX CAPABILITY OF THE J2 UNIVERSAL TOOL-KIT.
  5. 5. CERTIFYING THE AIRCRAFT Start Certifying Right at the Beginning Whilst an aircraft performance is its main design feature, aircraft cannot fly without being certified. Unfortunately Aircraft Certification is an intense, lengthy and costly process. It is not one that is wished to be repeated unnecessarily. With this in mind, the J2 Universal Tool-Kit provides the ability to fly the complete certification process from the very beginning of the design. FLY THE FLIGHT TEST PROGRAM FROM THE FIRST IDEAS This ability to focus on the end minimises wasted time investigating areas early on in the lifecycle which are not the driving force of the design. This improves the efficiency Build Complex Certification Manoeuvres Graphically of the design and engineering resources. When the certification is considered from the beginning of the design process, it is easier to make changes that may have resulted in re-design later on. By the time the aircraft is ready for the wind tunnel, all options and ideas have been considered and investigated, not only with respect to performance, and there is a great deal of confidence in the proposed airframe. As each update is made it is possible to simply re-run the test envelope and manoeuvres ensuring the certification standards are always met. See the Results and Establish whether the Aircraft will get Certified. THE AIRCRAFT CAN BE CERTIFIED AND RE-CERTIFIED ON THE COMPUTER, PROVIDING A GREATER PROBABILITY OF SUCCESS DURING THE REAL CERTIFICATION.
  6. 6. Classical Analysis Whilst the J2 Universal Tool-Kit works with non-linear models covering the complete flight envelope, there is always the need to investigate and demonstrate compliance to standards when it comes to certification. This requires the linearisation of the aircraft at points around the envelope and the investigation into the classical modes of motion and corresponding characteristics. These characteristics are then assessed against standards to demonstrate compliance. All this capability is inherent in the J2 Classical plug-in. VIEW INSTANTLY HOW A NEW DESIGN COMPARES TO THE STANDARDS. Comparison of Airspeed and Altitude on SPO Characteristics J2 Classical fully automates the process of conversion from non-linear to linear models, the calculation of the modes and the comparison to the standard criteria. Templates built into the system supply boundaries and limits for different phases of flight with an integrated capability in J2 Visualize to create user defined templates to cover in-house criteria or additional Figures of Merit. State Space models are also generated which can then be used for the further rapid development of AFCS. Investigating Open and Closed Loop Characteristics over a COMPARE THE IMPACT OF AFCS range of Airspeeds ON THE HANDLING QUALITIES DURING ALL PHASES OF FLIGHT. All these features means that there is a reduced workload on the engineers to calculate and evaluate the characteristics leading to an increased knowledge of the aircraft and how it compares to standards leading to reduced certification times.
  7. 7. Supporting Flight Test Even at the end of the design phase, as the flight test program has started, the J2 Universal Tool-Kit is still a major tool to assist in the evaluation and planning of the flight test program. Data from the flight data recorder can be automatically imported into the software. This can be used to construct manoeuvres which can then be run to evaluate how the predictive model compares to the real aircraft. The predictive model can then be updated to flight match the real aircraft. Using Flight Test Data to create manoeuvres for Flight Matching Subsequent test flights can then first be flown using the J2 Universal Tool- Kit and the results presented to Test Pilots. This enables pilots to see and view the test flight before they start and demonstrates what they can expect. PILOTS DEVELOP CONFIDENCE IN THE AIRCRAFT AND IN THE AIRCRAFT MODEL THROUGH THE ABILITY TO TEST, UPDATE AND RE-TEST. Comparing Predictive and Actual Data
  8. 8. AUTOMATIC FLIGHT CONTROL SYSTEM DESIGN Developing Autopilots and Fly-By-Wire Most modern aircraft have some form of Automatic Flight Control System (AFCS) in its simplest terms; this can be a height/heading hold autopilot. On military aircraft this can be developed to correct for unstable airframes, and provide different controller options for different flight regimes. With Unmanned Aircraft the AFCS can be used for automatic waypoint navigation and extended to support swarming and many other options. When designing an AFCS, industries most common tool is Matlab/Simulink. This is a very flexible tool for developing any sort of control system. Unfortunately, this requires the engineer to put all Drop Aircraft Model straight into Matlab/Simulink FCS Model the aerospace knowledge into the tool. When running analyses, the engineer has to develop complex models for the aircraft, and is only able to run one case at a time. These are both time consuming processes, and can result in fewer options and ideas being considered over a smaller subset of the preferred envelope. The J2 Universal Tool-Kit and the J2 Matlab Toolbox are able to overcome these problems, seamlessly integrating the System design capability of Matlab/Simulink with the aircraft models and batch capability of J2 Universal. Aircraft Taking the Aircraft and FCS model and Running Analyses models built using J2 Builder can be Across the Whole Flight Envelope “dropped” straight into a Matlab/Simulink system design model, and the FCS Designer can concentrate on the development of the FCS rather than the construction of the aircraft model. These models can then be brought back into the J2 Universal Tool-Kit for detailed analysis across the whole flight envelope. THE ABILITY TO FOCUS EFFORT ON THE FCS DESIGN AND EVALUATE ACROSS THE COMPLETE FLIGHT REGIME GIVES UNLIMITED FLEXIBILITY.
  9. 9. COMPLETE UNDERSTANDING Visualising and Viewing the Results The analysis side is only part of the capability of the J2 Universal Tool-Kit. There is further power and capability through the use of data displays and visualisation. Integrated into the J2 Universal Tool-Kit are J2 Visualize and J2 Virtual. J2 Visualize gives instant cross plots, time histories, traces and data monitors allowing engineers to see the results as either post processing or as data are generated. Drag Curve Generated from Cross Plot of Multiple Trim Conditions J2 Virtual provides a 360° playback capability giving a complete understanding in real-time in a scaled environment of the aircraft behaviour. Different scenarios and designs can be compared automatically without the need to transfer the data to other applications. This saves time and helps to minimise mistakes. Data from CAD packages can be imported so that users can view their aircraft and see how it flies. Comparing Different Scenarios to Assess the impact of change STATE OF THE ART VISUALISATION INCREASES UNDERSTANDING AND DEMONSTRATES THE TRUE CHARACTERISTICS OF THE AIRCRAFT Comparing Flights in a 3-D Real Time Playback
  10. 10. SIMULATION Fly the Design straight of the drawing board The integrated graphics capability ensures a full and detailed understanding of the aircraft’s behaviour throughout the project. However, sometimes it is necessary to “feel” the aircraft behaviour, and to understand how the numbers and charts relate to the pilot. This can give a better understanding of Pilot Induced Oscillations, pilot reaction delays, and how putting a man into the system can have a further effect on the overall behaviour of the aircraft. With classical simulation, to enable aircraft models to be converted into real time simulation models requires the development of tables, and the development of simulation code. This means a further lengthy and complex process, which results in real-time simulation being left until the very end of the design process, or for pilot training. Desktop Simulation enables Engineers to get a WITH THE J2 PILOT PLUG-IN, IT IS real “feel” of the aircraft POSSIBLE TO FLY ANY AIRCRAFT AT ANY STAGE IN THE DESIGN PROCESS. Automatic interfaces are already in existence, which means no code is required to be written or data files exported. The plug-in can automatically interface with any model in the system and fly-real-time. As the project develops, it is necessary to get Test Pilots to evaluate the aircraft. With J2 Pilot, the same flight models and software used to drive desktop simulation can be integrated into Motion Platforms and Full Mission Simulators to enable continuity from design to evaluation and test. This represents a significant cost saving on the development of simulator models as they can be taken straight from the engineering solutions without additional effort and rework. Using J2 Pilot to Drive a Full Motion G-Cuing Seat providing further feedback to Pilots for Enhanced Pilot Training
  11. 11. PUTTING IT ALL TOGETHER The whole is greater than the sum of the parts The J2 Universal Tool-Kit contains a series of plug-ins that provides different functionality for different aspects of flight modelling and performance analysis. Each plug-in is designed to enable engineers to develop solutions faster at any stage in the design cycle. There is a removal in the reliance of each engineer to developer their own code which results in a cottage industry of spreadsheets and small applications that leads towards inefficiencies in projects due to the continual maintenance and tweaking. Fully integrated tool-kit, eliminating the need to switch between applications to build models, perform analysis and visualise results. However, the benefits do not stop with the functionality and capability of each plug-in. When all the plug-ins are merged into the J2 Universal Tool-Kit there are further benefits through the use of a consistent platform. The J2 Universal Tool-Kit provides central integrated application using consistent data and a common platform with seamless communication between engineers and disciplines. THIS MEANS IMPROVED COMMUNICATIONS, AND AN ELIMINATION OF POTENTIAL ERRORS CAUSE BY DATA TRANSFER, RESULTING IN A MORE EFFICIENT AND COHESIVE PROCESS. On top of this is an integrated version control and configuration management system that ensures that all individuals are working with the latest version of information. Furthermore management can observe the process, keeping track of workloads and project performance.
  12. 12. IT TOOK J2 AIRCRAFT DYNAMICS’ AEROSPACE ENGINEERING AND AIRCRAFT DESIGN SPECIALISTS OVER 10 YEARS TO BUILD THE ‘CODE’ THAT ENABLES THE UNIVERSAL TOOL–KIT TO INVESTIGATE ALL ASPECTS OF AIRCRAFT HANDLING AND PERFORMANCE. WE HAVE DONE ALL THIS SO THAT YOU DON’T HAVE TO. This state-of-the-art, but easy-to-use software PLUG-INS suite gives you unprecedented power to design J2 Builder and ‘fly’ multiple configurations of the complete An easy-to-use graphical interface that flight envelope in a 3-D virtual environment – all rapidly develops aircraft models and at the click of a mouse! When using the J2 builds multiple variants for comparison Universal Tool Kit, you can save hundreds of thousands of dollars by streamlining your J2 Elements process, maximizing your analysis capability and Enables automatic calculation of total aerodynamic coefficients and derivatives reduce the risk of serious project flaws. through integrated strip theory. J2 Developer At the heart of J2’s A Software Development Kit (SDK) for all software is the J2 users to write their own components and Universal Framework, libraries with an interface into J2 Aircraft Models. a cutting-edge configuration control J2 Freedom Provides flight dynamics simulation of and data management aircraft data models, allowing you to platform that hosts all evaluate the complete flight envelope. steps of the design process. Everything J2 Active we offer begins and An open COM interface that instantly interacts with this key integrates your existing design packages with the power of the J2 Universal Tool- framework. kit. J2 Matlab Toolbox Get the full capability of J2 with Simulink Now it’s time to investigate our range of plug- Model files. Manoeuvres from within J2 ins. ‘Mix and match’ their additional design and can be flown on Simulink Models. Run all analysis capabilities using floating licenses. Take analyses from within J2 Universal Tool- control of a bespoke package that perfectly fits Kit. J2 Visualize your requirements. This way, you get Instant understanding and evaluation of the right functionality and maximise the return aircraft behaviour through data visualization and graphic displays. on your investment. J2 Virtual View any results in a virtual 3-D real- ARE YOU READY TO RETHINK THE WAY YOU world, to understand what exactly DEVELOP YOUR AIRCRAFT? happens during unexplained/complex manoeuvres J2 Pilot To find out more about J2 Aircraft Dynamics, Using the J2 Pilot plug-in’s automatic interfaces/models you can fly aircraft on our software and our consultancy services, visit your. You can also use J2 Pilot interfaces www.j2aircraft.com to merge the finished design into pilot training simulators.