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AIAA Atmospheric Flight Mechanics Conference 2011

作者： Xu, He-Yong Ye, Zheng-Yin National Key Laboratory of Science and Technology on Aerodynamic Design and Research Northwestern Polytechnical University Xi'an 710072 China

ISBN: (纸本)9781624101533

In the present paper, a new kind of flutter exciter for the aircraft flight testing is numerically simulated, and its aerodynamic characteristics are investigated, using the CFD technology of solving unsteady Euler equations based on unstructured overset grids. The numerical results show that the flutter exciter system can generate a reasonably stable exciting force, which is very convenient for the aircraft flutter testing. Additionally, the flutter efficiency can be influenced by some parameters, such as slotted central angle β, diameter of the slotted cylinder d, distance ΔL between the rotational axis and the trailing edge of the vane, section shape of the slotted cylinder, and so on. Too large β, ΔL or too small β, ΔL have bad effect on the flutter efficiency;a larger force can be generated with a larger diameter d;the crescent shape is a better choice. The type of near-root half-opening can generate a little larger exciting force for the flutter testing, comparing with the type of near-tip half-opening. © 2011 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.

关键词： Efficiency

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design and Dynamics Analysis of Anti-skid Braking system for Aircraft with Four-wheel Bogie Landing Gears

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Chinese Journal of Mechanical Engineering 2011年第2期24卷 277-284页

作者： ZHANG Ming NIE Hong ZHU Rupeng Key Laboratory of Fundamental Science for National Defense-Advanced Design Technology of Flight Vehicle Nanjing University of Aeronautics and Astronautics Nanjing 210016 China College of Mechanical and Electrical Engineering Nanjing University of Aeronautics andAstronautics Nanjing 210016 China

In asymmetric conditions,the movement and loads of left/right wheels or front/back wheels of the aircraft with multi-wheel or four-wheel bogie landing gears are *** are few open literatures related to anti-skid braking system for multi-wheels due to technology *** China,the research on multi-channel control and non-equilibrium regulation has just started,and the design of multi-channel control system for anti-skid braking,the simulation of asymmetry taxiing under braking are not *** this paper,a dynamics model of ground movement for aircraft with four-wheel bogie landing gears is established for braking simulation, considering the six-degree-of-freedom aircraft body and the movement of bogies and wheels.A multi-channel anti-skid braking system is designed for the wheels of the main landing gears with four-wheel *** eight wheels on left and right landing gears are divided into four groups,and each group is controlled via one *** cross protection and self-locked protection modules are added between different channels.A multi-channel anti-skid braking system with slip-ratio control or with slip-velocity control is established *** on the aircraft dynamics model,aircraft braking to stop with anti-skid control on dry runway and on wet runway are *** simulation results demonstrate that in asymmetric conditions,added with cross protection and self-locked protection modules,the slip-ratio-controlled braking system can automatically regulate brake torque to avoid deep slipping and correct aircraft *** proposed research has reference value for improving brake control effect on wet runway.

关键词： anti-skid braking system four-wheel bogie landing gear multi-channel control dynamics model

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An On-line Multiparametric Water Quality Monitoring system Based on Visible Spectrophotometry

An On-line Multiparametric Water Quality Monitoring System B...

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2nd International Conference on Manufacturing science and Engineering

作者： Liao, Haiyang Tian, Peng Du, Yu Wen, Zhiyu National Key Laboratory of Fundamental Science of Micro/Nano-Device and System Technology China Microsystem Research Center Chongqing University Chong Qing 400044 China

ISBN: (纸本)9783037850312

Water quality monitoring plays an important role in contamination control and environment protection. This paper describes an on-line multiparametric water quality monitoring system based on visible spectrophotometry, which combines embedded technology with GPRS telecommunication technology. This system can realize online wireless monitoring to concentrations of chromium (Cr), plumbum (Pb), A surfactant (AS), chemical oxygen demand (COD), ammonia nitrogen (AN), total phosphorus (TP) and total phenol (TPh) in real time. The mechanical structure, hardware circuit and software design of the system are completed. The absorption spectrums of pure water and MB-SDS complex have been measured. Preliminary experiments using a model machine show that each mechanism of the system runs well. Moreover, the monitor possesses many advantages, such as high degree of automation, high reliability, high efficiency, compact structure, small size, and so on.

关键词： Water Quality Monitoring Visible Spectrophotometry Embedded technology GPRS

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Strength analysis for pre-stressed bolted joints of turntable bearings

Strength analysis for pre-stressed bolted joints of turntabl...

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2011 International Conference on Electronic and Mechanical Engineering and Information technology, EMEIT 2011

作者： Xu, Weiwei Liu, Hongbin Xue, Yujun Li, Jishun School of Mechatronics Engineering Henan University of Science and Technology Luoyang 471003 China Henan Key Laboratory for Machinery Design and Transmission System Henan University of Science and Technology Luoyang 471003 China State Key Laboratory of Mining Heavy Equipment Luoyang 471039 China

ISBN: (纸本)9781612840857

This paper describes a calculation model for pre-stressed bolted joints used to connect turntable bearing to the flanges. A traditional pre-stressed bolted joint calculation model is described and its insufficiencies for the direct application on turntable bearings are pointed out. The suggested stress analysis is done by modeling the most loaded single bolt segment of the turntable bearing assembly, applying the preload and the working load on it. The alternating stress in the bolt is done by finite element analysis. The results show that the alternating load of the bolt is significantly decreased and is lower than the fatigue limit of the bolt under the condition of the larger tightening force. Therefore, it should be possible to increase the preload in the conditions that the maximum stress of bolt is below its yield limit stress situation. © 2011 IEEE.

关键词： Stress analysis

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The proposition and application of the orthogonal regression experiment design in the ergonomics study of the interface design

The proposition and application of the orthogonal regression...

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2011 IEEE International Symposium on IT in Medicine and Education, ITME 2011

作者： Chen, Qi'An Zhai, Dandan Li, Songhua Zeng, Liqun Department of Computer Science and Technology Xiamen University Xiamen Fujian Province China National Key Laboratory of Science and Technology on Avionics System No.432 GuiPing Road XuHui District ShangHai China

ISBN: (纸本)9781612847023

This paper firstly analyzes the limitations of the traditional ergonomic experimentation, and for the limitations, put forward orthogonal regression experiment by the combination of the advantages and disadvantages of each two commonly portion experimentation: orthogonal experimental design and regression experimental design. Finally, use an interface design experiment example to illustrate the application of the orthogonal regression experiment design in the interface design, and also provide reference for the application of this field. © 2011 IEEE.

关键词： Ergonomics

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SkyBoundary: An improved approach to member promotion in social networks

SkyBoundary: An improved approach to member promotion in soc...

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9th IEEE Int. Conf. on Dependable, Autonomic and Secure Comput., DASC 2011, incl. 9th Int. Conf. on Pervasive Intelligence and Computing, PICom 2011, 9th Int. Symp. on Embedded Computing, EmbeddedCom 2011, 1st Int. Conf. on Cloud and Green Comput.CGC

作者： Peng, Zhuo Wang, Chaokun Tao, Fangbo Han, Lu School of Software Tsinghua University Beijing 100084 China Tsinghua National Laboratory for Information Science and Technology Key Laboratory for Information System Security Ministry of Education China

ISBN: (纸本)9780769546124

With the rapid development of Social Network (SN for short), people increasingly pay attention to the importance of the roles which they play in the SNs. As is usually the case, the standard for measuring the importance of the members is multi-objective. The skyline operator is thus introduced to distinguish the important members from the entire community. For decision-making, people are interested in the most potential stars which can be promoted into the skyline with minimum cost, namely the problem of Member Promotion in Social Networks. In this paper, based on the characteristic of the skyline operator and the promotion process, we first of all propose some interesting new concepts such as Promotion Boundary to design a novel promotion boundary-based pruning strategy. After that, we bring forward an effective cost-based pruning strategy on the basis of permutation and combination theories to verify the plans in the ascending order of cost. The Sky Boundary algorithm is therefore proposed to solve the problem effectively by employing the optimization strategies. Extensive experiments on both real and synthetic datasets are conducted to show the application value, effectiveness and efficiency of the Sky Boundary algorithm. © 2011 IEEE.

关键词： Costs

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Model design of new product management information system based on BPR

Model design of new product management information system ba...

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2011 International Conference on system science, Engineering design and Manufacturing Informatization, ICSEM 2011

作者： Jia, Xianzhao Dong, Fei Liu, Hongbin School of Electrical Engineering Henan University of Science and Technology Luoyang 471003 China Henan Key Laboratory of Modem Mechanical Design and Transmission System Luoyang 471003 China

ISBN: (纸本)9781457702471

Based on BPR theory, the new product development and manufacturing process status of a discrete manufacturing enterprise was analysed with finding out its existing problems, then a new reasonable process was designed and the model of management information system was established. Through the analysis of this case, this paper provides a reference for other similar enterprises to manage new product development and promote the development of enterprise information. © 2011 IEEE.

关键词： Information management

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A Layout Optimization Method of Composite Wing Structures Based on Carrying Efficiency Criterion

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Chinese Journal of Aeronautics 2011年第4期24卷 425-431页

作者： ZHAO Qun DING Yunliang JIN Haibo Key Laboratory of Fundamental Science for National Defense-Advanced Design Technology of Flight Vehicle Nanjing University of Aeronautics and Astronautics Nanjing 210016 China

A two-level layout optimization strategy is proposed in this paper for large-scale composite wing structures. design requirements are adjusted at the system level according to structural deformation, while the layout is optimized at the subsystem level to satisfy the constraints from system level. The approaching degrees of various failure critical loads in wing panels are employed to gauge the structure’s carrying efficiency. By optimizing the efficiency as an objective, the continuity of the problem could be guaranteed. Stiffened wing panels are modeled by the equivalent orthotropic plates, and the global buckling load is predicted by energy method. The nonlinear effect of stringers’ support elasticity on skin local buckle resistance is investigated and approximated by neural network （NN） surrogate model. These failure predictions are based on analytical solutions, which could effectively save calculation resources. Finally, the integral optimization of a large-scale wing structure is completed as an example. The result fulfills design requirements and shows the feasibility of this method.

关键词： composite wing structure layout optimization carrying efficiency buckling equivalent stiffness energy method surrogate model

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Radar equation of high-speed weak target

Radar equation of high-speed weak target

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2011 International Conference on Advanced Mechatronic systems, ICAMechS 2011

作者： Pang, Cun-Suo Zhang, Nan Lu, Xiang-Yang National Key Laboratory for Electronic Measurement Technology Key Laboratory of Instrumentation Science and Dynamic Measurement of Ministry of Education North University of China Taiyuan 030051 China Second System Design Department Second Research Academy CASIC Beijing 100854 China Electrical Engineering Department Zhongyuan Institute of Technology Zhengzhou 450007 China

ISBN: (纸本)9780955529375

Without considering the echo signal power changes caused by target distance changes during the accumulated time the traditional radar equation is hardly applied. We take account of the effects of velocity, signal-to-noise ratio during the processing time;a modified radar equation is built which can be used for long-time integration of weak targets with high speed. After analyzing the relation between detection range and target velocity, integration time with processing time, we draw the constraint conditions and the corresponding conclusions. © 2011 Intl Journal of Adv Mechatr.

关键词： Signal to noise ratio

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Parallel spatial hashing for collision detection of deformable surfaces

Parallel spatial hashing for collision detection of deformab...

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12th International Conference on Computer-Aided design and Computer Graphics, CAD/Graphics 2011

作者： Fan, Wenshan Wang, Bin Zhou, Jianliang Sun, Jiaguang School of Software Tsinghua University China Beijing Aerospace Control Center China Department of Computer Science and Technology Tsinghua University China Key Laboratory for Information System Security Ministry of Education of China China Tsinghua National Laboratory for Information Science and Technology China

ISBN: (纸本)9780769544977

We present a fast collision detection method for deformable surfaces with parallel spatial hashing on GPU architecture. The efficient update and access of the uniform grid are exploited to accelerate the performance in our method. To deal with the inflexible memory system, which makes the building of stream data a challenging task on GPU, we propose to subdivide the whole workload into irregular segments and design an efficient evaluation algorithm, which employs parallel scan and stream compaction, to build the stream data in parallel. The load balancing is a key aspect that needs to be considered in the SIMD parallelism. We break the heavy and irregular collision computation down into lightweight part and heavyweight part, ensuring the later perfectly run in load balancing manner with each concurrent thread processes just a single collision. In practice, our approach can perform collision detection in tens of milliseconds on a PC with NVIDIAGTX 260 graphics card on benchmarks composed of millions of triangles. The results highlight our speedups over prior CPU-based and GPU-based algorithms. © 2011 IEEE.

关键词： Graphics processing unit

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