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Verification of HTV-X resilient design by simulation environment with model-based technology

Verification of HTV-X resilient design by simulation environ...

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aiaa modeling and simulation technologies conference, 2018

作者： Noumi, Ai Ujiie, Ryo Ueda, Satoshi Someya, Kazunori Ishihama, Naoki Kondoh, Yoshinori Japan Aerospace Exploration Agency 2-1-1 Sengen TsukubaIbaraki305-8505 Japan Japan Aerospace Exploration Agency 3-1-1 Yoshinodai Chuo-ku SagamiharaKanagawa252-5210 Japan Japan Aerospace Exploration Agency Sengen TsukubaIbaraki305-8505 Japan

ISBN: (数字)9781624105289

ISBN: (纸本)9781624105289

Japan Aerospace Exploration Agency (JAXA) has successfully launched and operated an unmanned supply cargo vehicle called the H-II Transfer Vehicle (HTV) six times as of 2017. Currently, a new-generation cargo vehicle called HTV-X is being developed. The first HTV-X flight is planned in JFY 2021. A new redundant design based on resilience engineering of HTV-X is being proposed. The new design policy, which stipulates that all redundant strings operate to manage degraded performance instead of switching one string due to failure, increases the complexity compared to conventional design. Therefore, various system behaviors, including such undesirable events as failure, must be evaluated and reflected in the system design. Generally, the control logic is validated using Simulink, but such issues as calculation time and event injection must still be overcome using Simulink. A system simulation environment that incorporates a native C code library generated by Matlab’s auto-coding function has been developed to overcome these issues. This paper describes the validation results of the GNC algorithm design of HTV-X using a simulation environment with model-based technology for this conceptual study. It also presents the results of Monte Carlo simulation and cases of simulated failure. © 2018, American Institute of Aeronautics and Astronautics Inc, aiaa. All rights reserved.

关键词： Simulink

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An adaptive sequential experiment design method for metamodeling

An adaptive sequential experiment design method for metamode...

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modeling and simulation technologies conference, 2018

作者： Zhou, Yuchen Fang, Ke Ma, Ping Yang, Ming Control & Simulation Center Harbin Institute of Technology Harbin150001 China

ISBN: (数字)9781624105517

ISBN: (纸本)9781624105517

Metamodels are extensively utilized to replace the computational-cost simulation models in calibration, performance analysis and design optimization. Various types of experiment design methods have been proposed for the metamodeling. In this paper, an adaptive sequential sampling method based on Delaunay triangulation is proposed. A support distance criterion is designed to measure the space filling property of candidate design points and a local linear appropriation approach is provided to estimate the prediction error. Furthermore, the metamodeling process based on the proposed adaptive sampling method is discussed. Finally, a systematic comparison is conducted to evaluate the effectiveness of the proposed adaptive sequential sampling method (ASED) and two types of metamodels (Gaussian process model and adaptive regression splines). The numerical experiments indicate that the GP model constructed with ASED achieves the best prediction performance. © 2018, American Institute of Aeronautics and Astronautics Inc, aiaa. All rights reserved.

关键词： Design

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Simulating the unexpected: Challenge-centric simulator scenario design for advanced flight crew training

Simulating the unexpected: Challenge-centric simulator scena...

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aiaa modeling and simulation technologies conference, 2018

作者： Niedermeier, Dominik Buch, Jan-Philipp Durak, Umut Mohrmann, Frederik Braunschweig38108 Germany Amsterdam1059 CM Netherlands Flight Dynamics and Simulation Institute of Flight Systems

ISBN: (数字)9781624105289

ISBN: (纸本)9781624105289

In 2013 the International Civil Aviation Organization (ICAO) published a report on the implementation of Evidence-Based Training (EBT). EBT aims at improving the overall capabilities of a pilot trainee in certain competencies such as decision-making, communication, situational awareness and others. This results in a shift in training focus from maneuvers to the training of competencies, which in turn sets different requirements for the desired simulator training scenarios. This paper presents a training scenario design approach being driven by the expected impact on the crew rather than focusing on specific maneuvers or system failures. The so-called "Challenge-Centric" design approach was applied in the EU project Man4Gen. It forms the basis for the development of a scenario design kit that shall facilitate the design of training scenarios for Evidence-based Training. © 2018, American Institute of Aeronautics and Astronautics Inc, aiaa. All rights reserved.

关键词： Decision making

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Validation and determination of critical parameters for a material ablation model using the charring ablation response program

Validation and determination of critical parameters for a ma...

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aiaa modeling and simulation technologies conference, 2018

作者： Langston, Jon H. Priest, Jeremy Stefani, Francis Koo, Joseph H. The University of Texas at Austin AustinTX78712 United States Department of Mechanical Engineering 204 E. Dean Keeton St.-C2200 AustinTX78712 United States Structural Aerospace Loads and Dynamics Engineer MRI Technologies 2101 NASA Parkway HoustonTX77058 United States Department of Aerospace Engineering and Engineering Mechanics 210 E. 24th St.-C0600 AustinTX78712 United States Polymer Nanocomposites Technology Lab. Department of Mechanical Engineering 204 E. Dean Keeton St.-C2200 AustinTX78712 United States 6402 Needham Lane AustinTX78739 United States

ISBN: (数字)9781624105289

ISBN: (纸本)9781624105289

In this study, a one-dimensional model of material ablative response is developed using the Fully Implicit Ablation and Thermal Response Program computer code (FIAT). The model calculates surface recession rate and surface and in-depth temperatures of the sample and is validated utilizing experimental data collected for the material PICA, a phenolic impregnated carbon fiber preform. In developing this model, the goal is to create a standard for modeling material ablative response of new TPS materials with limited thermophysical data. A new method for determining the convective properties of the oxy-acetylene torch test stand is outlined and implemented upon previous work. Predictions of the model currently differ significantly from stated accuracy goals, necessitating further research. © 2018, American Institute of Aeronautics and Astronautics Inc, aiaa. All rights reserved.

关键词： Ablative materials

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Enhancing scenario-centric air traffic control training

Enhancing scenario-centric air traffic control training

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aiaa modeling and simulation technologies conference, 2018

作者： Chhaya, Bharvi Jafer, Shafagh Coyne, William B. Thigpen, Neal C. Durak, Umut Embry-Riddle Aeronautical University Daytona BeachFL32114-3900 United States Academy Oklahoma City OK73169 United States Institute of Flight Systems Braunschweig38108 Germany Department of Electrical Computer Software and Systems Engineering Embry-Riddle Aeronautical University - Daytona Beach Campus Lehman 343 600 S Clyde Morris Blvd Daytona BeachFL32114-3900 United States Air Traffic Management Embry-Riddle Aeronautical University Daytona Beach Campus 600 S Clyde Morris Blvd Daytona BeachFL32114-3900 United States Air Traffic Division AMA-511C Staff Office Training Branch Enroute Section Advanced Enroute Operations Unit Mike Monroney Aeronautical Center 6500 South MacArthur Blvd Oklahoma CityOK73169 United States Flight Dynamics and Simulation Lilienthalplatz 7 Braunschweig38108 Germany

ISBN: (数字)9781624105289

ISBN: (纸本)9781624105289

As one of the main focuses of Federal Aviation Administration (FAA) Academy, Air Traffic Control (ATC) training program heavily relies on simulation-based training and is constantly looking into optimizing the use of such technologies. On the other hand, ATC simulation scenarios are not only used for training purposes, but also are key components for conducting human performance experiments. From a recent visit at the FAA Academy, it is well apparent that there is an immediate need for a diverse pool of ATC training scenarios available to trainees off-site. Currently, training scenarios are generated manually from a subject-matter-expert’s (i.e. controllers) oral or written briefing. The effort in extracting and verifying operational scenarios and translating them into a machine-understandable language is rather cumbersome and currently conducted completely manual. To address these challenges, here we propose to develop a scenario exploration technology that provides a platform for FAA Academy trainees and instructors to exercise variety of scenarios in the ATC domain. The proposed technology provides a platform for instructors and trainees to explore various training exercises. By taking a model-driven approach and extending the recently proposed domain-specific Aviation Scenario Definition Language (ASDL), we provide ATC scenario specification and exploration platform to easily create a variety of ATC scenarios. Similar to ASDL approach, we first define an ontology for ATC extension, then specify scenario logic using a formal specification language such as statechart, and finally, include a metamodel to allow for scenario modeling. © 2018, American Institute of Aeronautics and Astronautics Inc, aiaa. All rights reserved.

关键词： Air traffic control

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DCNs-2: a Cloud Network Simulator Extension for ns-2 18

DCNs-2: a Cloud Network Simulator Extension for ns-2

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21st ACM International conference on modeling, Analysis and simulation of Wireless and Mobile Systems (MSWiM)

作者： Bellavista, Paolo Foschini, Luca Luciano, Sabato Solimando, Michele DISI Univ Bologna Viale Risorgimento 2 I-40136 Bologna Italy

ISBN: (纸本)9781450359603

The widespread exploitation of cloud technologies forces cloud providers to forecast peaks of requests to guarantee always the adequate quality of service to their currently served customers. Static resource provisioning is rarely affordable for large Data Center Networks (DCNs) and dynamic resource management can be rather complex, in particular for networking. Hence, we claim the relevance of simulator-based approaches, helpful in planning DCN deployment and in analyzing performance behaviors in response to expected traffic patterns. However, existing cloud simulators exhibit non-negligible limitations for what relates to the modeling of networking issues of cloud Infrastructure as a Service (IaaS) deployments. Therefore, we propose DCNs-2, a novel extension package for the ns-2 simulator, as a valid solution to efficiently simulate DCNs with all their primary entities, such as switches, physical machines, racks, virtual machines, and so on.

关键词： Network simulation Data Center Network Cloud Computing Infrastructure as a Service ns-2

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Development of advanced aerodynamic data fusion techniques for flight simulation database construction

Development of advanced aerodynamic data fusion techniques f...

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modeling and simulation technologies conference, 2018

作者： Tyan, Maxim Kim, Mukyeom Pham, Vinh Choi, Cheol Kyun Nguyen, L. V. Thang Lee, Jae-Woo Dept. of Aerospace Information Engineering Konkuk University Seoul05029 Korea Republic of

ISBN: (数字)9781624105517

ISBN: (纸本)9781624105517

Aerodynamic database is the most complicated and one of the most important components of flight simulation. The database is composed of multiple tables containing static, dynamic and control coefficients of an aircraft at various flight conditions. There also exist a variety of data sources that may be used to construct the tables. A set of computational methods is proposed in this research that allow the time efficient and accurate construction of the aerodynamic database. Four data fusion scenarios are developed for quick generation of aerodynamic tables. Scenarios include construction of a table using high-fidelity computational analysis, refinement of a low-fidelity data using more sophisticated analysis tools, combination of experimental and computational data, and combination of a data located at different parts of a design space. Construction of a full set of aerodynamic tables for generic fighter aircraft will be demonstrated as well as comparison of an aircraft responses with existing simulation and flight test data. © 2018, American Institute of Aeronautics and Astronautics Inc, aiaa. All rights reserved.

关键词： Flight simulators

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simulation of radar signal propagation via multipath

Simulation of radar signal propagation via multipath

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modeling and simulation technologies conference, 2018

作者： Sudol, Alicia Gordon, Seth Ford, Hallie Inclan, Eric Mavris, Dimitri N. Miller, Michael Z. Georgia Institute of Technology School of Aerospace Engineering AtlantaGA30332 United States Georgia Tech Research Institute AtlantaGA30332 United States

ISBN: (数字)9781624105517

ISBN: (纸本)9781624105517

While radar systems are necessary for detecting and tracking potential threats, they are rarely deployed in ideal environments (e.g., flat land with no buildings). Furthermore, accidental interference between friendly radars can generate uncertainty and misunderstandings about the environment being surveyed. Prior research on this topic developed the initial framework, environment model, and user interface. The next stage of the project centers on expanding the single-pulse model to a multi-radar, multipath simulation. Multipath radar simulations are a necessary step in order to capture the physics of a radar-target-environment interaction. However, multipath radar modeling can become computationally expensive, which means that heuristics need to be developed in order to determine an acceptable number of "bounces" to track. This research focused on the dominant multipath along a transmitter to terrain/clutter to receiver path. An array-based method of data storage and computation ensure the process is time-efficient. Plots were further developed which illustrate which radar locations maximize the increase in coverage and which regions increase the risk for interference and may require further investigation at a higher level of fidelity. © 2018, American Institute of Aeronautics and Astronautics Inc, aiaa. All rights reserved.

关键词： User interfaces

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Design and evaluation of a haptic aid for training of the manual flare manoeuvre

Design and evaluation of a haptic aid for training of the ma...

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aiaa modeling and simulation technologies conference, 2018

作者： Deldycke, P.J. Van Baelen, D. Pool, D.M. Van Paassen, M.M. Mulder, M. Delft University of Technology Control and Simulation Section Faculty of Aerospace Engineering P.O. Box 5058 Delft2600GB Netherlands

ISBN: (数字)9781624105289

ISBN: (纸本)9781624105289

The use of haptic feedback as a tool for skill training has shown benefits for the formation of motor-memory and support for certain temporal tasks. Therefore, this research focuses on the development of a haptic aid for supporting the training of the challenging manual flare maneuver in initial pilot training. The haptic aid, which consisted of three "off-target" haptic modes each meant to clarify a typical mistake in flare execution, was designed based on instructor actions during real flight training. The High Roundout (HR) mode was designed to better train flare timing. This haptic mode implemented an increase in pitch-up stick stiffness when still above the desired flare altitude. The Late Roundout (LR) and Ballooning (BA) modes used repeated pulses on the stick – in pitch-up and pitch-down directions, respectively – to alert trainees when they flared too late (or not at all) or when overly large pitch-up inputs that would lead to regaining altitude were given. To test the haptic aid, a quasi-transfer-of-training experiment with 16 novices was performed in a full-motion research simulator. A baseline group and a group receiving haptic feedback were compared and in the haptics group the haptic aid was used during the training phase of the experiment, but disabled in the evaluation phase. A second-stage evaluation, with an untrained landing scenario, was used to verify the generalizability of the skills. The obtained data indicates no improved learning effect regarding flare trajectory. It was found that due to the difficulty of the task, strategies based on linking the cues to desired discrete touchdown performance were formed. The usage of the HR mode, however, resulted in more consistent initiation of the flare which was retained after transfer. The second-stage evaluation also did not show worsening of flare performance, suggesting generalizability of the skills with the haptic aid. © 2018, American Institute of Aeronautics and Astronautics Inc, aiaa. All rig

关键词： Aviation

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Global LPV model identification of flapping-wing dynamics using flight data

Global LPV model identification of flapping-wing dynamics us...

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aiaa modeling and simulation technologies conference, 2018

作者： Armanini, S.F. Karásek, M. de Visser, C.C. Delft University of Technology Delft2629HS Netherlands Control & Simulation Section Faculty of Aerospace Engineering Kluyverweg 1 Delft2629HS Netherlands

ISBN: (数字)9781624105289

ISBN: (纸本)9781624105289

Biologically-inspired flapping-wing micro aerial vehicles are characterised by nonlinear, unsteady aerodynamics and complex dynamics, both highly challenging to model. To take full advantage of the flight capabilities of such vehicles, it is necessary to obtain insight into their dynamics in the different flyable conditions, and to provide adequate control in all of these conditions. Nonetheless, the dynamics are typically only considered in a single flight regime, and controllers are frequently tuned for a particular flight condition. Due the high complexity of flapping flight and limited availability of accurate free-flight data, global models are not yet readily available, particularly models based on free-flight data and suitable for practical applications. This paper demonstrates an approach to obtain a global dynamic model for a flapping-wing micro aerial vehicle. To allow for standard linear control and systems theory to be applied, the nonlinear dynamics are approximated using a linear parameter-varying (LPV) approach based on a set of local linear models. The scheduling parameters, and the parameters in the underlying local models, are determined using system identification methods applied to free-flight data collected on a real test platform, and covering a significant part of the flight envelope. The proposed approach allows for modelling of the vehicle and prediction of the dominant dynamic properties across the considered part of the flight envelope, using a total of 16 parameters, as opposed to the starting point of 46 local models with 12 parameters each. The use of a single model adapting to the flight condition provides flexibility and continuous coverage, and is therefore highly useful for simulation and control applications. While in the explored part of the flight envelope the nonlinearity was found to be limited, such that a weighted average model may be sufficient for some applications, the LPV model provides a higher accuracy and more consiste

关键词： Antennas

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