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第三届国际机械工程与力学会议

作者： Qiang CHEN Guolai YANG Zhangqing ZHU Department of Systems and Control Engineering Department of Systems and Control Engineering Nanjing University Department of Mechanical Design and Automation School of Mechanical Engineering Nanjing University of Science and Technology

The projectile movement on bore is the key factor of gun vibration character. In order to obtain the projectile movement with the information in time-domain and frequency-domain, the wavelet transform is used for time-domain and frequency-domain analysis of response from the dynamics model with coupling between gun and projectile. The dynamics model of multi-body system with consideration of collisions between projectile and rifle is constructed for a gun. The traverse acceleration of projectile with time history is acquired by numerical computation. Because wavelet transform has favorable locality in time-domain and frequency-domain and the signal time-domain average is not needed, the continuous wavelet transform is applied to construe the response on acceleration of projectile. The figure of time frequency phase plane is plotted, which can directly describe the energy and time when the collision of projectile occurs, and can provide the reference for gun vibration characteristic analysis.

关键词： Vibration gun dynamic wavelet time-domain and frequency-domain analysis

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Adaptive steering controller to improve handling stability for driver-combined-vehicles system

Adaptive steering controller to improve handling stability f...

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IEEE International Symposium on Computational Intelligence in Robotics and Automation (CIRA)

作者： Qiang Wang Masahiro Oya Natsuki Takagi Yuichiro Taira Hidetaka Ota Department of Systems Design and Informatics Kyushu Institute of Technology Fukuoka Japan Department of Mechanical and Control Engineering Kyushu Institute of Technology Fukuoka Japan Department of Mechanical and Control Engineering National Fisheries University Shimonoseki Japan

ISBN: (纸本)9781424448081

If the dynamics of combined vehicles such as tractor-semitrailer varies greatly, it may be very difficult for inexperienced drivers to achieve good handling stability. Moreover, once combined vehicles become unstable, it is very difficult for all drivers to stabilize vehicles. However, if the behavior of actual combined vehicles tracks a designed desired combined vehicle, the good handling property can be maintained even when the dynamics of actual combined vehicles varies large. In this paper, to achieve good handling property even for large variation of vehicle dynamics, a design method for a desired combined vehicle is shown, and then, an adaptive steering controller is developed so that the actual vehicle tracks the desired vehicle. The developed adaptive steering controller has strong robustness for the uncertainties of vehicle parameters. Moreover, a driver model is introduced to show the characteristics of driver. Carrying out numerical simulations, it is shown that the developed adaptive steering controller is very useful for the driver-combined-vehicles system.

关键词： Programmable control Adaptive control control systems Stability Vehicle dynamics Vehicle driving design methodology Robust control Uncertainty Numerical simulation

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Adaptive control of systems with input saturation: A scheme using output derivatives of order up to relative degree

Adaptive control of systems with input saturation: A scheme ...

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IEEE International Symposium on Computational Intelligence in Robotics and Automation (CIRA)

作者： Natsuki Takagi Masahiro Oya Qiang Wang Toshihiro Kobayashi Department of Mechanical and Control Engineering Kyushu Institute of Technology Fukuoka Japan Department of Systems Design and Informatics Kyushu Institute of Technology Fukuoka Japan

ISBN: (纸本)9781424448081

In this paper, the main attention is focused on transient property of control input signal, we propose a novel adaptive controller for time-continuous single-input single-output linear systems with an input saturation in which i-th derivatives of the output signal (i = 1, ···, relative degree) are available. To improve the control performance, a novel estimator using an observer for the tracking error signals is proposed. Using the estimator, it is shown theoretically that the tracking error between the controlled object output and the reference model output can converge to zero when the initial value of the tracking error satisfies a condition.

关键词： Adaptive control control systems Error correction Programmable control Linear systems Closed loop systems Stability Equations Aging Convergence

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Nanofabrication of three-dimensional imprint diamond molds by ECR oxygen ion beams using polysiloxane

Nanofabrication of three-dimensional imprint diamond molds b...

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作者： Shuji, Kiyohara Tomoyuki, Kashiwagi Hirofumi, Takikawa Yuichi, Kurashima Yoshio, Taguchi Yoshinari, Sugiyama Electric and Control System Engineering Course Faculty of Advanced Engineering Maizuru National College of Technology 234 Aza Shiroya Maizuru Kyoto 625-8511 Japan Department of Electrical and Electronic Engineering Toyohashi University of Technology Toyohashi Aichi 441-8580 Japan Department of Mechanical Systems Engineering University of Yamanashi 4-3-11 Takeda Kofu Yamanashi 400-8511 Japan Application and Technical Section ELIONIX INC 3-7-6 Motoyokoyama Hachioji Tokyo 192-0063 Japan

We have investigated the nanofabrication of three-dimensional (3D) chemical vapor deposited (CVD) diamond molds in Electron Cyclotron Resonance (ECR) oxygen ion beam etching technologies using polysiloxane [-R2SiO-]n as an electron beam (EB) mask and a room-temperature (RT)-imprint resist material. The polysiloxane exhibited a negative-exposure characteristic and its sensitivity was 5:5 × 10 -5 C/cm2. The maximum etching selectivity of polysiloxane film against diamond film was 4.7, which was obtained under the following ECR oxygen ion etching conditions: ion energy of 400 eV, ion incidence angle of 0 ° , microwave power of 100 W, gas pressure of 1:4 × 10 -2 Pa and stage temperature of 24 ° C. The diamond molds of cone and tetragonal pyramid dots were fabricated with polysiloxane mask in EB lithography technology using the RT-nanoimprint lithography (NIL) process. The dots are 500, 600, 700, 800, 900 nm in diameter and width respectively. The pitch between the dots is 2 μm, and each dot has a height of about 1 μm. It was found that the optimum imprinting pressure and its depth obtained after the press for 5 min were 0.5 MPa and 0.5 μm respectively. The resulting diameter of each imprinted polysiloxane pattern was in good agreement with that of the 3D-diamond mold. We carried out the RT-NIL process for the fabrication of diamond nanopatterns, using the 3D-diamond molds that we developed. © 2009 The Surface Science Society of Japan.

关键词： Room temperature

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Annual business and news:: Beginning the 31st year of the Journal of Guidance, control, and Dynamics

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JOURNAL OF GUIDANCE control AND DYNAMICS 2008年第1期31卷 1-1页

作者： Schmidt, George T. Aeronautics and Astronautics Massachusetts Institute of Technology (MIT) AIAA Institute of Electrical and Electronics Engineers Russian Federation Academy of Navigation and Motion Control Department of Mechanical and Aerospace Engineering and Engineering Mechanics University of Missouri-Rolla(UMR) Lockheed Electronics Company Center for Space Research University of Texas Austin United States Wright Laboratory Eglin Air Force Base UMR AIAA Guidance Navigation and Control Technical Committee American Automatic Control Council Lockheed Martin Aeronautics Company Palmdale CA United States C4ISR and Unmanned Air Vehicle (UAV) Programs for Air Vehicle Sciences and Systems Accreditation Board Engineering and Technology Inc./Aeronautical National Technical Committee on Guidance Navigation and Control Department of Mechanical and Aerospace Engineering University at Buffalo State University of New York (SUNY) AIAA Technical Committee on GN and C Air Vehicles Directorate Air Force Research Laboratory (AFRL) Wright-Patterson Air Force Base Space Access and Hypersonic Vehicle Guidance and Control Group Control Science Center of Excellence AFRL AIAA Technical Committee on Guidance Navigation and Control Department of Mechanical and Aeronautical Engineering University of California (UC) Davis United States Boeing Company Modernized Flight Control System for the Apache Longbow AIAA Institute of Electrical and Electronics Engineers AHS Jet Propulsion Laboratory California Institute of Technology Boeing Company Flight Sciences and Advanced Design Group Guidance Navigation and Control (GN and C) Systems Engineer Distributed Space Systems NASA Goddard Space Flight Center (GSFC) AIAA GN and C Technical Committee Department of Aerospace Engineering and Engineering Mechanics University of Texas Austin United States Institute of Navigation American Astronautical Society AIAA Guidance Navigation (GN and C) and Control Technical Committee Department of Aerospace Engineering Iowa State University Iowa

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An extended 316L stainless steel model suitable for industrial rolling

An extended 316L stainless steel model suitable for industri...

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作者： Abbod, M.F. Mahfouf, M. Linkens, D.A. Sellars, C.M. Institute for Microstructural and Mechanical Process Engineering School of Engineering and Design University of Sheffield West London United Kingdom Department of Automatic Control and Systems Engineering Institute for Microstructural and Mechanical Process Engineering University of Sheffield United Kingdom Department of Engineering Materials Institute for Microstructural and Mechanical Process Engineering University of Sheffield United Kingdom

ISBN: (纸本)9783902661272

During hot rolling processes, the material under deformation undergoes different deformation conditions, i.e. temperature changes and strain rates. One particular variable is the change in strain rate which can vary from low to very high values in industrial rolling. Usually empirical models are used for predicting the material characteristics but they are only valid within constrained limits. In this work an extended model has been developed to predict the stress/strain characteristics of 316L stainless steel material under a wider range of deformation conditions, i.e. high strain rates changes which do not follow the equation-of-states laws.. Copyright © 2007 IFAC.

关键词： Strain rate

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Multi-modal simulation for microstructural and property prediction for al alloy hot rolling

Multi-modal simulation for microstructural and property pred...

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作者： Linkens, D.A. Wong, T. Abbod, M.F. Mahfouf, M. Talamantes-Silva, J. Department of Automatic Control and Systems Engineering Institute for Microstructural and Mechanical Process Engineering University of Sheffield Sheffield S1 3JD United Kingdom Institute for Microstructural and Mechanical Process Engineering School of Engineering and Design Brunel University United Kingdom Sheffield Forgemasters Institute for Microstructural and Mechanical Process Engineering University of Sheffield United Kingdom

ISBN: (纸本)9783902661272

This study presents the application of FE modelling and intelligent systems techniques to the prediction of microstructural mapping for aluminium alloys. Here, the material within each finite element is defined using a set of non-linear physicallybased equations. These are then solved in real-time using a semi-physical grey-box model. This model is based on a neuro-fuzzy approach and it has been embedded within the FE technique. The model maps the evolution of the internal state variables (i.e. dislocation density, subgrain size and subgrain boundary misorientation) and their effect on the recrystallisation behaviour of the stock. This paper presents the model development, the integration between the numerical techniques, and the application of the technique to a hot rolling operation using an Aluminium, 1wt% Magnesium alloy. In addition, the developed model includes a CA (Cellular Automata) level to represent inhomogeneous nature of microstructural beheviour. Copyright © 2007 IFAC.

关键词： Recrystallization (metallurgy)

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Hot rolled aluminium alloys texture via hybrid modelling

Hot rolled aluminium alloys texture via hybrid modelling

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作者： Mahfouf, M. Linkens, D.A. Abbod, M.F. Talamantes-Silva, J. Department of Automatic Control and Systems Engineering Institute for Microstructural and Mechanical Process Engineering University of Sheffield Sheffield S1 3JD United Kingdom Institute for Microstructural and Mechanical Process Engineering School of Engineering and Design University of Sheffield United Kingdom Sheffield Forgemasters Institute for Microstructural and Mechanical Process Engineering University of Sheffield United Kingdom

ISBN: (纸本)9783902661272

During the thermomechanical processing of aluminium alloys, the material experiences a complex history of temperature, time, and strain path. The rolling and deformation process has an effect on the evolution of the material texture which can be modelled using finite element models of the rolling process and a Taylor model for texture evolution. This paper explores the potential of modelling the rolling and texture evolution processes using data-driven systems models to reduce the computational time and achieve better accuracy.. Copyright © 2007 IFAC.

关键词： Finite element method

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A 'Kane's Dynamics' model for the active rack isolation system. Part one: A linearised model

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International Journal of Vehicle systems Modelling and Testing 2007年第2期2卷 153-192页

作者： Hampton, Roy David Beech, Geoffrey S. Subba Rao, Nagendra N. Rupert, Jason K. Kim, Young K. Civil and Mechanical Engineering Department US Military Academy West Point NY 10996 United States Vehicle Analysis Branch Spacecraft and Vehicle Systems Department Engineering Directorate Mail Stop: EV12 Huntsville AL 35812 United States Sagamigaoka-1-34-20 Granero Yosiyama-201 Japan Simulation and Analysis Section Missile and Aviation Systems Department Dynetics Inc. 1000 Explorer Boulevard Huntsville AL 35806 United States Control Systems Design and Analysis Branch Flight Mechanics and Analysis Division Engineering Directorate Mail Stop: EV41 Huntsville AL 35812 United States

Many microgravity space-science experiments require vibratory acceleration levels unachievable without active isolation. The Boeing Corporation's Active Rack Isolation System (ARIS) addresses these isolation requirements on the International Space Station (ISS) at the rack level. Effective model-based vibration isolation requires • an appropriate isolation device • an adequate dynamical model of that isolator • a suitable, corresponding controller. ARIS provides the ISS response to the first requirement. This paper presents the use of 'Kane's Dynamics' to develop a state-space, analytical (algebraic) set of linearised equations of motion meeting the second requirement, for use in addressing the third via optimal controller design. Copyright © 2007 Inderscience Enterprises Ltd.

关键词： Spacecraft

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The Research on Augmented Reality in Digital design

The Research on Augmented Reality in Digital Design

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2007国际机械工程与力学会议

作者： Qiang CHEN Xianzhong ZHOU Guolai YANG Department of Systems and Control Engineering School of Management and Engineering Nanjing University Department of Mechanical Design and Automation School of Mechanical Engineering Nanjing University of Science and Technology

Augmented Reality (AR) is a new technology which is developed from Virtual Reality (VR). It is the key technology of modern Virtual Prototyping. As same as Virtual Reality technology, AR enables the interactive and easy-to-understand workbench of digital design. The basic concept of AR and the comparison between AR and VR are explored first in this paper. Based on the characteristics of AR, the viewpoint of closely combining product design with simulation of digital prototyping and functional prototyping is presented in the paper. The virtual prototyping simulation system and hardware-in-loop simulation are jointed. The way of using AR and the potential for future applications are also studied in this paper.

关键词： Augmented Reality Digital design Virtual Reality Virtual Prototyping

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