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Training effectiveness evaluation of helicopter emergency relief based on virtual simulation

Chinese Journal of Aeronautics 2018年第10期31卷 2000-2012页

作者： Xue SUN Hu LIU Guanghui WU Yaoming ZHOU School of Aeronautic Science and Engineering Beihang UniversityBeijing 100083China Key Laboratory of Aircraft Advanced Design Technology Ministry of Industry and Information TechnologyBeijing 100083China State Key Laboratory of Virtual Reality Technology and Systems Beijing 100083China Commercial Aircraft Corporation of China Ltd.Shanghai 200126China

Helicopters are playing an increasingly important part in emergency relief, such as earthquake rescue, firefighting and medical transport. With the development of virtual simulation technology, virtual simulation-based training is widely used in the training of the helicopter crew especially for the dangerous and costly missions mentioned above. A complete training effectiveness evaluation method is proposed to evaluate the trainees＇ training effect based on virtual simulation in this paper. A key to this method is regarding the complicated process as a discrete event-activity flow system and establishing the evaluation indicator system. Then expert group and Analytical Network Process（ANP） are applied to determine the weight of indicators. When the training data are processed, there is a novel attempt to apply Fuzzy Comprehensive Evaluation（FCE） model to calculate the two categories of indicators. Eventually, an experiment and the analysis were carried out to validate the evaluation method.

关键词： Analytical network process Emergency relief Fuzzy comprehensive evaluation Helicopter Training effectiveness evaluation Virtual simulation

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Team effectiveness evaluation and virtual reality scenario mapping model for helicopter emergency rescue

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Chinese Journal of Aeronautics 2020年第12期33卷 3306-3317页

作者： Xue SUN Hu LIU Yongliang TIAN Guanghui WU Yuan GAO School of Aeronautic Science and Engineering Beihang UniversityBeijing 100083China Key Laboratory of Aircraft Advanced Design Technology Ministry of Industry and Information TechnologyBeijing 100083China State Key Laboratory of Virtual Reality Technology and Systems Beijing 100083China Commercial Aircraft Corporation of China Ltd.Shanghai 200126China

The application of helicopter emergency rescue is becoming increasingly widespread,but the flight crew training in this area is still difficult due to high cost and ***,with the development of Virtual Reality(VR)technology,virtual simulation has become a significant role in crew training of helicopter *** the implementation of VR-based training,how to transform complex real tasks into VR scenarios and how to evaluate the performance of crew are of great *** address these issues,a novel VR-based R-E-A-D(Report,Evaluate,Agree,Do)evaluation model for training is proposed,which is suitable for complex missions with multiple tasks,multiple scenarios,and multiple ***,a mapping method of VR scenarios is put forward,which can transform the real tasks into virtual scenarios to serve the virtual simulation ***,an experiment is carried out to verify the feasibility of the evaluation method and virtual scenario mapping method.

关键词： Helicopter emergency rescue Scenario mapping model Team effectiveness evaluation Virtual reality(VR) Virtual simulation-based training

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Efficient particle image velocimetry data restoration via probabilistic principal component analysis 50

Efficient particle image velocimetry data restoration via pr...

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50th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition

作者： Lee, Kyunghoon Mavrisy, Dimitri N. Singapore-MIT International Design Centre Singapore University of Technology and Design Singapore 138682 Singapore Georgia Institute of Technology Atlanta GA 30332-0150 United States Advanced Aerospace Systems Analysis Aerospace Systems Design Laboratory Daniel Guggenheim School of Aerospace Engineering United States

ISBN: (数字)9781600869365

In experimental ow analyses using particle image velocimetry (PIV), spurious PIV measurements can be rectified with gappy proper orthogonal decomposition (POD), which utilizes a least-squares approximation with a POD basis. As an alternative to gappy POD, this paper proposes to exploit an expectation-maximization (EM) algorithm for principal component analysis (PCA), termed as EM-PCA, which capitalizes on a Gaussian probabil-ity model for missing data estimation. To demonstrate the accuracy and eficiency of the EM-PCA in contrast to those of gappy POD, this research examines the two reconstruc-tion methods with a PIV data set obtained from acoustically-excited, bluff-body jet ow experiments. Overall, the EM-PCA is found to repair PIV data comparably accurate yet computationally eficient to gappy POD for PIV data restoration. Copyright © 2012 by Kyunghoon Lee and Dimitri N. Mavris.

关键词： Principal component analysis

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3D Ear Shape Matching Using Joint -Entropy

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Journal of Computer Science & Technology 2015年第3期30卷 565-577页

作者：孙晓鹏李思慧韩枫魏小鹏 Institute of Computer Systems School of Computer and Information Technology Liaoning Normal University Dalian 116029 China Beijing Key Laboratory of Intelligent Telecommunications Software and Multimedia Beijing University of Posts and Telecommunications Beijing 100876 China School of Mechanical and Engineering Dalian University of Technology Dalian 116024 China Key Laboratory of Advanced Design and Intelligent Computing Dalian University Dalian 116622 China

In this article, we investigate the use of joint a-entropy for 3D ear matching by incorporating the local shape feature of 3D ears into the joint a-entropy. First, we extract a sut^cient number of key points from the 3D ear point cloud, and fit the neighborhood of each key point to a single-value quadric surface on product parameter regions. Second, we define the local shape feature vector of each key point as the sampling depth set on the parametric node of the quadric surface. Third, for every pair of gallery ear and probe ear, we construct the minimum spanning tree （MST） on their matched key points. Finally, we minimize the total edge weight of MST to estimate its joint a-entropy the smaller the entropy is, the more similar the ear pair is. We present several examples to demonstrate the advantages of our algorithm, including low time complexity, high recognition rate, and high robustness. To the best of our knowledge, it is the first time that, in computer graphics, the classical information theory of joint a-entropy is used to deal with 3D ear shape recognition.

关键词： joint a-entropy minimum spanning tree local shape feature ear matching ear recognition

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Hydrogel-elastomer-based stretchable strain sensor fabricated by a simple projection lithography method

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International Journal of Smart and Nano Materials 2021年第3期12卷 256-268页

作者： Zhenqing Li Xiangnan He Jianxiang Cheng Honggeng Li Yuan-Fang Zhang Xiaojuan Shi Kai Yu Hui Ying Yang Qi Ge Shenzhen Key Laboratory of Biomimetic Robotics and Intelligent Systems Department of Mechanical and Energy EngineeringSouthern University of Science and TechnologyShenzhenChina Guangdong Provincial Key Laboratory of Human-Augmentation and Rehabilitation Robotics in Universities Southern University of Science and TechnologyShenzhenChina Digital Manufacturing and Design Centre Singapore University of Technology and DesignSingapore Department of Mechanical Engineering University of Colorado DenverDenverCOUSA National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbinP.R.China

Stretchable strain sensor detects a wide range of strain variation and is therefore a key component in various *** traditional ones made of elastomers doped with conductive components or fabricated with liquid conductors,ionically conductive hydrogel-based strain sensors remain conductive under large deformations and are ***,dehydration is a challenging issue for the *** have developed hydrogel-elastomer-based strain sensors where an elastomer matrix encapsulates a hydrogel circuit to prevent its ***,the reported multistep approaches are generally *** group recently reported a multimaterial 3D printing approach that enables fast fabrication of such sensors,yet requires a self-built digital-light-processing-based multimaterial 3D ***,we report a simple projection lithography method to fabricate hydrogel-elastomer-based stretchable strain sensors within 5 *** method only requires a UV projector/lamp with photomasks;the chemicals are commercially available;the protocols for preparing the polymer precursors are friendly to users without chemistry ***,the manufacturing flexibility allows users to readily pattern the sensor circuit and attach the sensor to a 3D printed soft pneumatic actuator to enable strain sensing on the *** proposed approach paves a simple and versatile way to fabricate hydrogel-elastomer-based stretchable strain sensors and flexible electronic devices.

关键词： Ionically conductive hydrogel stretchable strain sensor projection lithography

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Enhancing Operator Task Performance during Monitoring for Unanticipated Events through Ecological interface design

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Proceedings of the Human Factors and Ergonomics Society Annual Meeting 2008年第4期52卷 448 - 452页

作者： Nathan Lau Gyrd Skraaning Greg A. Jamieson Catherine M. Burns Cognitive Engineering Laboratory University of Toronto Toronto ON Canada Man-Technology-Organization OECD Halden Reactor Project Halden Norway Advanced Interface Design Laboratory University of Waterloo Waterloo ON Canada

A full scope simulator study with licensed Nuclear Power Plant (NPP) operators was conducted to evaluate the effectiveness of ecological displays in supporting operators with different types of tasks. The results suggest that ecological displays have a advantage in supporting operator performance during monitoring for unanticipated events as compared to mimic-based displays. Furthermore, ecological displays seem to achieve this performance advantage without imposing workload increases. This study provides supporting evidence that EID is effective at a scale and level of complexity representative of NPP operations.

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Experimental study of rotor blades vibration and noise in multistage high pressure compressor and their relevance

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Chinese Journal of Aeronautics 2020年第3期33卷 870-878页

作者： Fengtong ZHAO Xiaodong JING Mingsui YANG Deyou WANG Yundong SHA Xiaochi LUAN School of Energy and Power Engineering Beihang UniversityBeijing 100191China Liaoning Province Key Laboratory of Advanced Measurement And Test Technology of Aviation Propulsion Systems Shenyang Aerospace UniversityShenyang 110136China Shenyang Engine Design and Research Institute Aero Engine(Group)Corporation of ChinaShenyang 110015China

Rotor blades fault of aeroengine compressor is mostly caused by mechanical and aerodynamic *** the excitation factor of high intensity sound wave to rotor blades should not be *** researches are conducted on a multistage high pressure *** high level vibration occurs on the first stage of rotor blades, the noise spectrum presents typical characteristic for discrete multi-tone in the *** amplitude of blade vibration displacement and the sound pressure level of characteristic frequency noise increases and decreases simultaneously and reaches the maximum value at the same *** frequency merely occur on a certain speed range and is locked in a specific range which presents no variation with the rotating *** high level vibration occurs on the first stage of rotor blades, the noise spectrum presents a sharp peak and the propagation state of the characteristic frequency is a helix structure in the *** can be confirmed that acoustic resonance occurs in the multistage *** acoustic resonance frequency and its side band frequencies are generated by modulation of a rotating noise source at the rotor speed which is the excitation source of the rotor blades vibration.

关键词： Acoustic resonance Blades vibration Characteristic frequency Multistage compressor Source identification

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Scenario Mapping with Work Domain Analysis

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Proceedings of the Human Factors and Ergonomics Society Annual Meeting 2001年第4期45卷 424 - 428页

作者： Catherine M. Burns David J. Bryant Bruce A. Chalmers Advanced Interface Design Lab Systems Design Engineering University of Waterloo Waterloo Ontario Canada Humansystems Incorporated Guelph Ontario Canada Naval Command and Control Defence Research Establishment Atlantic Dartmouth Nova Scotia Canada

Work domain analysis is an approach that is moving from research to practical usage. Being highly analytical and time-intensive in its early stages, clients will search for early indications that the analysis is on track and relevant. This paper presents one approach for validating a work domain analysis by mapping the action patterns of operators against the work domain space developed by the analysis. This approach provides some validation the analysis, shows the use of the work domain over time in three dimensions, and provides a substantial link between the work analysis approach and traditional task-based approaches.

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All-optical reflection-mode microscopic histology of unstained human tissues

All-optical reflection-mode microscopic histology of unstain...

引用

Optical Tomography and Spectroscopy, OTS 2020

作者： Abbasi, Saad Le, Martin Ecclestone, Benjamin Abu-Sardanah, Serene Bell, Kevan Dinakaran, Deepak Bigras, Gilbert Mackey, John R. Reza, Parsin Haji PhotoMedicine Labs Systems Design Engineering University of Waterloo WaterlooONN2L 3G1 Canada illumiSonics Inc. Systems Design Engineering University of Waterloo WaterlooONN2L 3G1 Canada Department of Oncology University of Alberta EdmontonABT6G 2V1 Canada Department of Laboratory Medicine and Pathology University of Alberta EdmontonAB Canada

Current methods to visualize cancer margins can be time consuming or unreliable. Employing PARS microscopy, the first non-contact reflection-mode label-free histology-like images of cellular morphology in unstained th... 详细信息

ISBN: (纸本)9781943580743

关键词： Histology

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Anisotropic lattice Boltzmann-phase-field modeling of crystal growth with melt convection induced by solid-liquid density change

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Journal of Materials Science & Technology 2020年第22期54卷 26-32页

作者： Hui Xing Xianglei Dong Dongke Sun Yongsheng Han MOE Key Laboratory of Material Physics and Chemistry Under Extraordinary Shaanxi Key Laboratory for Condensed Matter Structure and PropertiesNorthwestern Polytechnical University710129Xi'anChina College of Materials Science and Engineering Zhengzhou University450001ZhengzhouChina Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments School of Mechanical EngineeringSoutheast UniversityNanjing211189China State Key Laboratory of Advanced Special Steel Shanghai Key Laboratory of Advanced FerrometallurgyShanghai UniversityShanghaiChina The EMMS Group State Key Laboratory of Multiphase Complex Systems.Institute of Process EngineeringChinese Academy of Science100190BeijingChina

Density change is ubiquitous in phase transformation, and it can induce melt convection which strongly influences the crystal growth. Here, an anisotropic lattice Boltzmann-phase-field method was extended to predict the dendritic growth under the shrinkage or expansion melt convection by density change induced. A novel LB equation with an anisotropic coefficient was constructed to model the advancement of ordering parameter, coupling with the passive scalar LB equation for convective and diffusive heat transfer during phase transition. We studied dendritic growth and shape selection with melt convection induced by density change in crystal growth. Results show that the melt convection induced by density change affects strongly the dendritic growth. The shrinkage flow results in a higher tip velocity while the expansion flow leads to a slower one. Predicted Péclet number with respect to the relative density change was compared with an analytical solution. Moreover, the modified selection parameter has been verified by numerical simulations.

关键词： Dendritic growth Density change Melt convection Phase-field method

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