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International Conference on Computer Application and System Modeling

作者： Zhuang, Qing Hong Ding, Ying Gong, Guang Hong Aviation Key Laboratory for Advanced Simulation Technology Beijing University of Aeronautics and Astronautics Beijing China

ISBN: (纸本)9781424472369

Physically-based cloth animation has been a hot topic to the graphics community for more than a decade. Among the physically-based models used in cloth animation, elastically deformable models have been used successfully in order to give a representation of the behavior. We present a novel PCMS (Predictive-Corrective Mass-Spring) algorithm in cloth simulation which combines the advantages of both BMS and an advanced numerical integration method, namely low computational costs and large time steps. The numerical and rendering results show that a speed-up of more than an order of magnitude over the commonly used mass-spring method while the simulation results are in agreement with real cloth behavior. In addition, the super-elastic effect will be effectively controlled without dynamic inverse constraints on deformation rates. © 2010 IEEE.

关键词： Numerical methods

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Researches on modeling and simulation of airplane infrared characteristic

Researches on modeling and simulation of airplane infrared c...

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International Conference on Computer Application and System Modeling

作者： Liu, Juan Gong, Guanghong Han, Liang Gao, Dongdong Aviation Key Laboratory for Advanced Simulation Technology Beijing University of Aeronautics and Astronautics Beijing China

ISBN: (纸本)9781424472369

One of the most important problems of airplane infrared simulation is to establish the simulation model accurately based on real-time status. This paper analyses the three main sources of infrared signatures in airplane: airplane-skin, nozzle components and exhaust plume. By reckoning environment radiation, aerodynamic heating, heat transferring and hot engine casing principle, a synthetic simulation method was used, especially a new infrared engine model for airplane was firstly proposed with airplane's working status as the input. Then atmospheric transmittance is analyzed through Modetran4 with various influential factors such as atmospheric aerosol and geometric path considered. Finally the simulation results obtained have been analyzed with respect to different work status and view angle parameters, which will have an important effect on infrared image simulation system in military simulation system. © 2010 IEEE.

关键词： Engines

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The nonlinear control of simulator of hexapod parallel mechanism

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Journal of Harbin Institute of technology(New Series) 2010年第3期17卷 393-397页

作者：潘春萍管欣卢颖梁建民 State Key Laboratory of Automobile Dynamic Simulation Jilin University Military Simulation Technology Research Institute Aviation University of Air Force

In order to enhance the innervation fidelity of simulators,a nonlinear controller is developed,which guarantees parallel mechanisms closed loop system global asymptotical stability and the convergence of posture tracking error in Cartesian space. The problems of rapid tracking under the condition of the wide range,nonlinear and variable load are solved. After the nonlinear controller is actually applied to the hexapod parallel mechanisms of simulator,the dynamic-static capabilities of motion system are tested by amplitude-frequency response and posture precision. The experimental results show that the static precision improves ten times and system output amplitude increases and the phase lag reduces with respect to the same input signal in Cartesian space in comparison with the traditional proportional and derivative (i.e. PD) controlling method in joint space. Therefore the nonlinear controller can effectively improve the dynamic-static response performance of the hexapod parallel mechanisms of simulators in Cartesian space.

关键词： simulators hexapod parallel mechanisms dynamics model nonlinear control irmervation＇ s fidelity

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Impact of Stagger Angle Nonuniformity on Turbine Aerodynamic Performance

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Journal of Thermal Science 2010年第5期19卷 465-472页

作者： Weihao Zhang Zhengping Zou Shangneng Pan Huoxing Liu Huoxing Liu Wei Li National Key Laboratory of Science and Technology on Aero-Engines School of Jet Propulsion Beihang University Beijing 100191 China Aeroengine Numerical Simulation Research Center B eihang University Beijing 100191 China Chinese Aviation Powerplant Research Institute Zhuzhou 412002 China

The assembling error may lead to variation in stagger angles,which would affect the aerodynamic performance of the *** investigate this underlying effect,two parallel numerical experiments on two turbines with the same profile,but uniform and nonuniform vane stagger angle respectively,were conducted in both steady and unsteady *** results indicate that certain changes in the detailed flow field of the turbine occur when the stagger angles are nonuniform,further,the blade loading distribution of the vane and rotor become markedly different from that in uniform vane stagger angle *** these consequences caused by nonuniformity mentioned above enhance the unsteadiness of the flow,finally,the aerodynamic performance changes *** also shows that,compared with steady simulation,the unsteady numerical simulation is necessary in this investigation.

关键词： assembling error stagger angle nonuniformity turbine aerodynamic performance

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Visualization of signalized intersections in driving simulator and validity of driving behaviors in virtual environments

Advances in Transportation Studies

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Advances in Transportation Studies 2011年第26期 17-28页

作者： Yan, X. Abdel-Aty, M. Guo, D. Radwan, E. MOE Key Laboratory for Transportation Complex Systems Theory and Technology Beijing Jiaotong University Beijing 100044 China Department of Civil and Environmental Engineering University of Central Florida Orlando FL 32816-2450 United States Computer Science Program College of Business Florida Gulf Coast University 10501 FGCU Boulevard South Fort Myers FL 33965-6565 United States Center for Advanced Transportation Systems Simulation University of Central Florida Orlando FL 32816-2450 United States

Visualization of highway traffic environments in virtual reality plays a key role on fidelity of simulation and validity of driving behaviors in driving simulator studies. This paper describes a procedure to replicate a signalized intersection with many complex features into a driving simulator's 3-D databases through building a graphical visual database, constructing a road motion database, and creating simulated traffic. The validity of the visualization was assessed via the comparison of the drivers' speeds in the simulator and the speed data at the real intersection. It was found that both speed data follow normal distributions and have equal means for each intersection approach;however, that the speeds measured in the driving simulator have a larger variability than those measured in the field. The users' subjective evaluation results indicated that 92% subjects could recognize the simulated intersection in the driving simulator experiment. Therefore, the strategy of geo-specific environment modeling would be useful for studying driving behaviors in virtual environments.

关键词： Visualization

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Object tracking based on local feature points

Object tracking based on local feature points

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Congress on Image and Signal Processing, CISP

作者： Haili Wang Liang Zhang Training Center of Engineering Technology Civil Aviation University of China Tianjin China Tianjin Key Laboratory for Advanced Signal Processing Civil Aviation University of China Tianjin China

This paper presents a novel local-feature-based algorithm to track objects through frames. Real-time performance and occlusion are great challenges in object tracking. Local features are more distinctive than global features in dealing with occlusion. SURF (Speeded-Up Robust Feature) can robustly identify objects in clutter scene and occlusion. However, initial SURF algorithm has difficulty in matching accurately. Combined NN/SN (ratio of closest and next closes distances) with RANSAC (Random Sample Consensus) algorithm and location correlation of corresponding features between two frames is proposed to reduce false match and speed up the matching procedure. This method exhibits very good performance in high reliable applications, for its effectiveness and reduced complexity. simulation on PETS database proves it effective.

关键词： Artificial neural networks Tin Feature extraction Signal processing algorithms Correlation Robustness Computer vision

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Researches on modeling and simulation of turbo-shaft engine and main rotor system

Researches on modeling and simulation of turbo-shaft engine ...

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2009 WRI World Congress on Computer Science and Information Engineering, CSIE 2009

作者： Ma, Shi-Dong Han, Liang Gong, Guang-Hong Song, Xiao Aviation Key Laboratory for Advanced Simulation Technology Beijing University of Aeronautics and Astronautics Beijing 100191 China

ISBN: (纸本)9780769535074

Modeling of power system plays an important part in modeling of helicopter dynamics system. The precision of turbo-shaft engine model affects directly the fidelity of power system model in process of modeling and simulation on helicopter. Modeling techniques of turbo-shaft engine are studied first, secondly, engine control system model based on main rotor load feedback is proposed and an inner-outer series-wound control loop to adjust engine output power based on feedback control is developed. The control law of turbo-shaft engine power adjustment is designed. Consequently, integrative model of turboshaft engine and main rotor on helicopter power system is realized. A simulation example for helicopter power system is given in this paper to validate the integrative model. © 2008 IEEE.

关键词： Helicopters

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Researches on Modeling and simulation of Turbo-Shaft Engine and Main Rotor System

Researches on Modeling and Simulation of Turbo-Shaft Engine ...

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Computer Science and Information Engineering, CSIE, WRI World Congress on FLAGGED

作者： Ma Shi-dong Han Liang Gong Guang-hong Song Xiao Aviation Key Laboratory of Advanced Simulation Technology Beijing Aeronautics and Astronautics University Beijing China

Modeling of power system plays an important part in modeling of helicopter dynamics system. The precision of turbo-shaft engine model affects directly the fidelity of power system model in process of modeling and simulation on helicopter. Modeling techniques of turbo-shaft engine are studied first, secondly, engine control system model based on main rotor load feedback is proposed and an inner-outer series-wound control loop to adjust engine output power based on feedback control is developed. The control law of turbo-shaft engine power adjustment is designed. Consequently, integrative model of turbo-shaft engine and main rotor on helicopter power system is realized. A simulation example for helicopter power system is given in this paper to validate the integrative model.

关键词： Engines Power system modeling Power system simulation Power system dynamics Helicopters Control system synthesis Output feedback Feedback loop Power generation Feedback control

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Structure of large gold clusters obtained by global optimization using the minima hopping method

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Physical Review B 2009年第4期79卷 041405(R)-041405(R)页

作者： Kuo Bao Stefan Goedecker Kenji Koga Frédéric Lançon Alexey Neelov State Key Laboratory of Superhard Materials Jilin University Changchun 130012 China Department of Physics Universität Basel Klingelbergstrasse 82 4056 Basel Switzerland National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba Ibaraki 305-8565 Japan INAC SP2M Laboratoire de Simulation Atomistique (L_Sim) CEA F-38054 Grenoble France

The energetic ground state of gold clusters with up to 318 atoms consists of complex geometries that have only a limited resemblance to the perfect icosahedra, decahedra, and octahedra that are encountered for some magic numbers. The structure changes in most cases completely by the addition of a single atom. Other low-energy structures are so close in energy that their Boltzmann weight is not negligible at room temperature.

关键词： gold ground states metal clusters

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Traction control methods based on special off-road vehicle with power take-off

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Jilin Daxue Xuebao (Gongxueban)/Journal of Jilin University (Engineering and technology Edition) 2009年第SUPPL. 1期39卷 18-21页

作者： Gao, Yang Li, Jing Lei, Yu-Long Gu, Ming-Qi Liu, Xue-Wei Li, You-De State Key Laboratory of Automobile Dynamic Simulation Jilin University Changchun 130022 China China Sanjiang Space Group in the Special Vehicle Technology Center Wuhan 430023 China Aviation University of Air Forces Changchun 130022 China

Traction control methods of special off-road vehicle with the power take-off were analyzed. The traction control strategy on the low attachment coefficient road relying on adjusting the clutch, axle differential and brake was presented. A full-time four-wheel-drive special off-road vehicle model with clutch was established. A software in-the-loop simulation platform with MATLAB was built and the simulation was analyzed. The results show that the traction control methods of special off-road vehicle with the power take-off can control the slip rate of over-spin wheels at the best value range without adjusting engine throttle, therefore the vehicle can pass the low adhesion road region.

关键词： Traction control

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