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24th International Congress on Sound and Vibration, ICSV 2017

作者： Ampatzidis, Theofanis Chronopoulos, Dimitrios Antoniadis, Ioannis Institute for Aerospace Technology Composites Group University of Nottingham NG7 2RD United Kingdom Machine Design and Control Systems Section School of Mechanical Engineering National Technical University of Athens Greece

Damping is one of the most important properties of materials, being responsible for increased durability and conmfort of the structures. In this paper the damping enhancement of materials with internal oscillators is examined. Wave Finite Element (WFE) method is used to get the wave propagation of an two-dimensional layered mechanical material having embedded nonlinear internal oscillators acting as negative stiffness element. The acoustic properties of the panel are studied in a Statistical Energy Analysis (SEA) scheme.

关键词： Damping

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Parameter optimization of the KDamper concept in seismic isolation of bridges using harmony search algorithm 6

Parameter optimization of the KDamper concept in seismic iso...

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6th International Conference on Computational Methods in Structural Dynamics and Earthquake engineering, COMPDYN 2017

作者： Syrimi, Panagiota G. Sapountzakis, Evangelos J. Tsiatas, George C. Antoniadis, Ioannis A. Institute of Structural Analysis and Antiseismic Research School of Civil Engineering National Technical University of Athens Zografou Campus AthensGR-157 80 Greece Department of Mathematics University of Patras PatrasGR-265 04 Greece Mechanical Design and Control Systems Section Mechanical Engineering Department National Technical University of Athens Zografou Campus AthensGR-157 80 Greece

ISBN: (纸本)9786188284418

In this paper a novel design methodology for seismic isolation of bridges is presented employing the KDamper passive system and the Harmony Search (HS) optimization algorithm. The implementation of the KDamper concept to the absorption of seismic excitation of bridge structures requires the solution of a linear dynamic problem during which the basic parameters of KDamper design must be predefined. As this selection appears to be a quite complex procedure, the need for an optimization process is of paramount importance. In our work, an emerging metaheuristic algorithm, the Harmony Search algorithm, which has been successfully applied to several engineering problems, is employed to obtain optimum design parameters for a typical bridge structure under seismic excitation. The optimal solution is obtained for a set of 5 earthquake excitation records using as objective function the Root Mean Square of the displacement ratio. Comparative results of the dynamic response between the initial and the isolated structure are presented to verify the effectiveness, validity and reliability of the proposed design method.

关键词： Optimization

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Research on Heat Transfer in High Temperature Garments

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IOP Conference Series: Materials Science and engineering 2019年第4期612卷

作者： Yi-Fei Wan Peng-Yi Lin Hao-Yi Li Chang-Ping Dai Department of Mechanical Design Xi'an University of Technology No.5 Jinhua South RoadXi'an China Department of Information and Control Engineering Xi'an University of TechnologyNo.5 Jinhua South Road Xi'an China Department of Engineering Management Changsha University of Science & Technology No. 960 Section 2 Wanjiali South Road Yuhua District Changsha China

This paper describes the Law of heat transfer between the layers of material and a method for determining the thickness of layers of material parameters of a high temperature protective clothing. Three important choice of protective clothing material and the air gap layer as the research object, based on the Fourier law and the energy conservation law to establish second order partial differential equation, solving the Crank-Nicolson method by second order partial differential equation, derived temperature, time, the relationship between the thickness. Finally, in the case where the heat transfer ANSYS software simulation under the above conditions, a comparative analysis with calculated transfer law, the error is 1.2%, higher accuracy results.

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Polynomial-matrix method for high-precision analysis of rotational shearing interferograms 31

Polynomial-matrix method for high-precision analysis of rota...

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31st Annual Meeting of the American Society for Precision engineering, ASPE 2016

作者： Kamiya, Kazuhide Nakahama, Kiyotaka Makino, Kimihiro Matsumoto, Kimihisa Tashiro, Hatsuzo Suzuki, Shinya Nomura, Takashi Department of Intelligent Systems Design Engineering Toyama Prefectural University Imizu Toyama Japan Department of Mechanical and Intellectual Systems Engineering Toyama University Toyama Toyama Japan Department of Electronics and Control Engineering Nagano National College of Technology Nagano Nagano Japan

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Time-optimal motion planning for n-DOF robot manipulators using a path-parametric system reformulation

Time-optimal motion planning for n-DOF robot manipulators us...

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American control Conference

作者： Robin Verschueren Niels van Duijkeren Jan Swevers Moritz Diehl Systems Control and Optimization Laboratory Department of Microsystems Engineering University of Freiburg Germany Division of Production engineering Machine design and Automation Department of Mechanical Engineering KU Leuven Belgium

ISBN: (纸本)9781467386838

Time-optimal motion planning for robotic manipulators consists of moving the robot along a path in Cartesian space as fast as possible. In contrast to time-optimal path following, small deviations from a predefined path are acceptable and can be exploited to further reduce the overall motion time. In this paper, we present a new method to compute time-optimal motions around a path. By employing an appropriate change of variables for the robot dynamics to path coordinates, geometric constraints enter the optimal control formulation in a convenient way. The reformulation of the robot dynamics and the path constraints is illustrated with numerical examples.

关键词： Robot kinematics Optimization Manipulators Dynamics Vehicle dynamics Optimal control Robot kinematics robot dynamics Manipulators Optimal control Vehicle dynamics motion planning Robot Manipulator dynamics Byways geometric constraint

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design and kinematic simulation of a novel exoskeleton rehabilitation hand robot

Design and kinematic simulation of a novel exoskeleton rehab...

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IEEE International Conference on Mechatronics and Automation

作者： Shuxiang Guo Weijie Zhang Jian Guo Jiange Gao Yuye Hu Tianjin Key Laboratory for Control Theory & Applications in Complicated Systems and Biomedical Robot Laboratory Tianjin University of Technology Tianjin China Intelligent Mechanical Systems Engineering Department Kagawa University Takamatsu Japan Tianjin Key Laboratory of the Design and Intelligent Control of the Advanced Mechatronical System Tianjin China

ISBN: (纸本)9781509023974

The rehabilitation exoskeleton robot is more and more used in the assisting stroke patients in implementing rehabilitation training. In this paper, a novel exoskeleton hand robot which was driven by cable has been proposed to aim at helping varieties of paralyses patients recover motor function. This exoskeleton hand rehabilitation robot system mainly consists of exoskeleton hand robot, EEG system, motor controllers unit, some sensors and a workstation. And the hand exoskeleton mechanism was portable, wearable and adjustable for patients doing home rehabilitation training. Based on the parameters from human hand, the kinematic model of hand robot was established to be used in designing and the kinematic simulation experiments about this exoskeleton hand robot were done. Through the simulation software ADAMS (Automatic Dynamic Analysis of mechanical systems), the parameters of position, angle velocity and angle accelerated velocity (PVA) of proximate inter-phalanger (DIP) distal inter-phalanger joint were simulated. And then, the movement situation of the DIP joint was obtained according to the data from the position encoder. So the velocity curve and accelerated velocity curve were obtained by calculating the actual position function derivation. The simulated results showed that this exoskeleton hand robot has high movement ability to finish the continuous passive motion (CPM). Beside that, a comparison test was done to verify whether there were some motion blocks in wearing exoskeleton robot. Through analyzing the experimental data, the error between the actual position and the simulated position of the PIP joint of the finger was very small which verified the small interference of robot. These experiments demonstrated that the exoskeleton hand robot has high efficiency movement ability for stroke patients who need to do the finger rehabilitation training. In the future, the optimization design of the exoskeleton hand robot will be done in order to improve more mov

关键词： Exoskeletons Thumb Robot sensing systems Joints Training

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design of the structural optimization for the upper limb rehabilitation robot

Design of the structural optimization for the upper limb reh...

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IEEE International Conference on Mechatronics and Automation

作者： Shuxiang Guo Jiange Gao Jian Guo Weijie Zhang Yuye Hu Tianjin Key Laboratory for Control Theory & Applications in Complicated Systems and Biomedical Robot Laboratory Tianjin University of Technology Tianjin China Intelligent Mechanical Systems Engineering Department Kagawa University Takamatsu Japan Tianjin Key Laboratory of the Design and Intelligent Control of the Advanced Mechatronical System Tianjin China

ISBN: (纸本)9781509023974

The exoskeleton robotic rehabilitation training system is a branch of the field of robotics, it is the external mechanical system that is consistent with the similar joints of the human body, and attached to the human body. With the development of exoskeleton rehabilitation robotic system, the biomechanics influence of device should be considered in rehabilitation training. This paper proposes a novel upper limb exoskeleton rehabilitation device based on biomechanics, which can be used in rehabilitation of upper limb for hemi paralysis patients. This system aims at helping hemi paralysis patients recover motor function of upper limb; in addition it is suitable for variety of patients. This system is portable and wearable, which consists of exoskeleton device, hepatic device (PHANTOM Premium), motor controllers and work station (computer). This paper proposes a structural optimization scheme in order to solve some problems of bowl's structure of the rehabilitation robot. The Pro/ENGINEER Wildfire (Pro/E) software is applied to get a three-dimensional modelling, kinematics simulation and dynamic analysis of the rehabilitation robot. From the analysis, the robot end motion simulation curves were obtained to verify the optimization structure reasonable and better motion characteristics. In the future, this structure will have a wide application prospect in the rehabilitation therapy field.

关键词： Robots Exoskeletons Wrist Jacobian matrices Gears Optimization Acceleration

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Integrated energy and power management: Validation testing for aerospace vehicles

Integrated energy and power management: Validation testing f...

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AIAA Modeling and Simulation Technologies Conference, 2016

作者： Yerkes, Kirk L. Pratt, David M. Doty, John H. van Muijden, Jaap Eussen, Bart J. G. Wu, Thomas Flight Systems Integration Branch Power and Control Division Air Force Research Laboratory Aerospace Systems Directorate WPAFB OH United States Design and Analysis Branch Aerospace Vehicles Division Air Force Research Laboratory WPAFB OH United States Department of Engineering Management and Systems University of Dayton 300 College Park DaytonOH United States National Aerospace Laboratory NLR AmsterdamCM1059 Netherlands Department of Flight Physics and Loads Aerospace Vehicles Division P.O. Box 90502 BM1006 Netherlands Department of Mechanical and Aerospace Engineering University of Central Florida 4000 Central Florida Blvd OrlandoFL32816 United States

ISBN: (纸本)9781624103872

The structured technical and organizational approach to integrated dynamic energy and power management research is outlined from an integrated vehicle and dynamic subsystem/component perspective. This approach combines physics-based and statistical modeling and component and system validation testing on baseline airframe(s) in a flight simulated environment. It is concluded that experimental data of individual system component tests are not alone sufficient. Laboratory tests on an integrated airframe with interacting subsystems are needed to properly define requirements for effective validation testing needed to support robust model-based engineering and life-cycle growth management. The objective is to develop and demonstrate a robust validation testing approach that transcends beyond the component-only focus to one that addresses the vehicle in its entirety and throughout the vehicle life-cycle. © 2016, American Institute of Aeronautics and Astronautics Inc. All rights reserved.

关键词： Structural frames

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Surface profile measurement from an oblique direction using a change in reflection angle 30

Surface profile measurement from an oblique direction using ...

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30th Annual Meeting of the American Society for Precision engineering, ASPE 2015

作者： Kamiya, Kazuhide Urata, Yoshiaki Matsumoto, Kimihisa Tashiro, Hatsuzo Suzuki, Shinya Nomura, Takashi Department of Intelligent Systems Design Engineering Toyama Prefectural University Imizu Toyama Japan Department of Mechanical and Intellectual Systems Engineering Toyama University Toyama Toyama Japan Department of Electronics and Control Engineering Nagano National College of Technology Nagano Nagano Japan

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Study on ultrasonic cavitation-assisted micro-endmill milling

Study on ultrasonic cavitation-assisted micro-endmill millin...

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International Conference on Machining, Materials and mechanical Technologies, IC3MT 2014

作者： Goto, Daisuke Maeda, Yukio Iwatsuka, Kenichi Kamiya, Kazuhide Tanaka, Hideaki Kato, Kazuya Yazawa, Takanori Suzuki, Shinya Department of Intelligent Systems Design Engineering Toyama Prefectural University Japan Department of Mechanical Engineering Shonan Institute of Technology Japan Graduate School of Engineering Nagasaki University Japan Department of Electronics and Control Engineering Nagano National College of Technology Japan

ISBN: (纸本)9783038354956

Micro-channel chips used in micro total analysis systems are attracting attention in medicine. In generally the photolithography technology used in semiconductor manufacturing is used to manufacture micro-channel chip Si-dies. However, this technology requires many processes, such as mask fabrication and the application of photoresist to a substrate as well as expensive clean room facilities. A micro-channel chip has a micro-groove 30-100 μm wide. This study examined how to form a fine groove by cutting with a micro-endmill, with the aim of shortening the window time and reducing the cost. This steel die requires high accuracy, for example, a burr area ratio of not more than 5% of the groove bottom area, a surface roughness of the side and bottom faces of less than 1μmRz, and a change in the sectional area of less than 1%. So, this study examines micro-endmill's cutting conditions, for example cutting speed, feed per tooth, and axial depth of cut. In MQL (minimum quantity of lubricant) cutting, the early fracture occurs when cutting was began. The cause has bad removing of the chips in MQL cutting, it is considered that the chips of hardened work have been re-cut as the result. Therefore, this study applied ultrasonic cavitation to milling, in order to solve this subject. This report experimentally examined the cutting performance of ultrasonic cavitation-assisted milling. We obtained the following results. In cutting distance of 20 m, the burr of MQL cutting is generated more than 5%, on the other hand, the burr of ultrasonic cavitation-assisted milling is less than that. In ultrasonic cavitation-assisted milling, a tool wear and fracture can be decreased by improvement of removing chips and lubrication. © (2015) Trans Tech Publications, Switzerland.

关键词： Milling (machining)

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