• Title/Summary/Keyword: inertia parameter

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Improvement of Low Speed Operation of Electric Machine Using ROELO for Inertia Identification (확장 루엔버거 관측기를 이용한 전동기의 저속 성능 향상)

  • Lee, Kyo-Bum;Song, Joong-Ho;Choi, Ik;Yoo, Ji-Yoon
    • The Transactions of the Korean Institute of Power Electronics
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    • 제9권3호
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    • pp.231-239
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    • 2004
  • A new scheme to estimate the moment of inertia in the motor drive system in very low speed is proposed in this paper. The simple estimation scheme, which is usually used in most servo system for low speed operation, is sensitive to the variation of the machine parameter, especially the moment of inertia. To estimate the motor inertia value, Reduced-Order Extended Luenberger Observer (ROELO) is applied. The effectiveness of the proposed inertia identification method using the RORLO is verified by simulation and experiment.

Equivalent moment of inertia of a truss bridge with steel-concrete composite deck

  • Siekierski, Wojciech
    • Structural Engineering and Mechanics
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    • 제55권4호
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    • pp.801-813
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    • 2015
  • Flexural stiffness of bridge spans has become even more important parameter since Eurocode 1 introduced for railway bridges the serviceability limit state of resonance. For simply supported bridge spans it relies, in general, on accurate assessment of span moment of inertia that governs span flexural stiffness. The paper presents three methods of estimation of the equivalent moment of inertia for such spans: experimental, analytical and numerical. Test loading of the twin truss bridge spans and test results are presented. Recorded displacements and the method of least squares are used to find an "experimental" moment of inertia. Then it is computed according to the analytical method that accounts for joint action of truss girders and composite deck as well as limited span shear stiffness provided by diagonal bracing. Finally a 3D model of finite element method is created to assess the moment of inertia. Discussion of results is given. The comparative analysis proves efficiency of the analytical method.

Dynamic Stability of a Drum-Brake Pad Considering Rotary Inertia and Shear Deformation (회전광성과 전단변형을 고려한 드럼-브레이크 패드의 동적안정성)

  • 오부진;공용식;류봉조;이규섭;임경빈
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 한국정밀공학회 2001년도 춘계학술대회 논문집
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    • pp.181-185
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    • 2001
  • This paper deals with the dynamic stability of a disc brake pad taking into account of its shear deformation and rotary inertia. A brake pad can be modeled as a beam like model subjected to distributed friction forces and having two translational springs. The study of this model is intended to provide a fundamental understanding of dynamic stability of drum brake pad. Governing equations of motion are derived from extended Hamilton's principle and their corresponding numerical solutions are obtained by applying the finite element formulation. The critical distributed friction force and the instability types are investigated bt changing two translational spring constants, rotary inertia parameter and shear deformation parameter. Also, the changes of eigen-frequencies of a beam determining instability types are investigated for various combinations of two translational spring constants.

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Inertia Identification of Electric Machine Using Extended Luenberger Observer at Low Speed Region (확장 루엔버거 관측기를 이용한 저속영역에서의 전동기 관성 추정)

  • Lee Kyo-Beum;Kang Ho-Jin;Song Joong-Ho;Choy Ick;Yoo Ji-Yoon
    • Proceedings of the KIPE Conference
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    • 전력전자학회 2002년도 전력전자학술대회 논문집
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    • pp.142-145
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    • 2002
  • A new scheme to estimate machine inertia in low speed is proposed in this paper. It is necessary to consider the machine parameter of low speed instantaneous observer to precise control in servo system, which has frequent load variation and speed change. To estimate machine parameter, especially the moment of inertia, Reduced-Order Extended Luenberger Observer (ROELO) is applied. The effectiveness of the proposed ROELO is showed by simulation.

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Free Vibrations of Horizontally Curved Beams with Rotatory Inertia and Shear Deformation (회전관성과 전단변형을 고려한 수평 곡선보의 자유진동)

  • 이병구;모정만;이태은;안대순
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • 제13권1호
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    • pp.63-69
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    • 2003
  • The ordinary differential equations governing free vibrations of elastic horizontally curved beams are derived, in which the effects of rotatory inertia and shear deformation as well as the effects of both vertical and torsional inertias are included. Frequencies and mode shapes are computed numerically for parabolic curved beams with the hinged-hinged, hinged-clamped and clamped-clamped ends. Comparisons of natural frequencies between this study and ADINA are made to validate the theories and numerical methods developed herein. The lowest three natural frequency parameters are reported. with and without the effects of rotatory inertia and shear deformation. as functions of the three non-dimensional system parameters: the horizontal rise to span length ratio. the slenderness ratio and the stiffness parameter.

Robust Adaptive Control Simulation of Wire-Suspended Parallel Manipulator

  • Farahani, Hossein S.;Kim, Bo-Hyun;Ryu, Je-Ha
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 2004년도 ICCAS
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    • pp.46-51
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    • 2004
  • This paper presents an adaptive control method based on parameter linearization for incompletely restrained wire-suspended mechanisms. The main purpose of this control method is utilizing it in a walking assist service robot for elderly people. This method is computationally simple and requires neither end-effector acceleration feedback nor inversion of estimated inertia matrix. In the proposed adaptive control law, mass, moment of inertia and external force and torque on the end-effector are considered as components of parameter adaptation vector. Nonlinear simulation for walking an elderly shows the effectiveness of the parameter adaptation law.

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Sensorless IPMSM Control Based on an Extended Nonlinear Observer with Rotational Inertia Adjustment and Equivalent Flux Error Compensation

  • Mao, Yongle;Yang, Jiaqiang;Yin, Dejun;Chen, Yangsheng
    • Journal of Power Electronics
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    • 제16권6호
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    • pp.2150-2161
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    • 2016
  • Mechanical and electrical parameter uncertainties cause dynamic and static estimation errors of the rotor speed and position, resulting in performance deterioration of sensorless control systems. This paper applies an extended nonlinear observer to interior permanent magnet synchronous motors (IPMSM) for the simultaneous estimation of the rotor speed and position. Two compensation methods are proposed to improve the observer performance against parameter uncertainties: an on-line rotational inertia adjustment approach that employs the gradient descent algorithm to suppress dynamic estimation errors, and an equivalent flux error compensation approach to eliminate static estimation errors caused by inaccurate electrical parameters. The effectiveness of the proposed control strategy is demonstrated by experimental tests.

An Improvement of Low Speed Operation of Electric Machine with Inertia Identification Using ROELO (축소 차원 확장 루엔버거 관성 추정기를 이용한 전동기 저속운전의 성능 개선)

  • Lee, Kyo-Beum;Yoon, Young-Chul;Song, Joong-Ho;Choy, Ick;Yoo, Bum-Jae;Yoo, Ji-Yoon
    • Proceedings of the KIEE Conference
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    • 대한전기학회 2003년도 하계학술대회 논문집 B
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    • pp.1090-1092
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    • 2003
  • A new scheme to estimate the moment of inertia in the motor drive system in very low speed is proposed in this paper. The simple speed estimation scheme, which is usually used in most servo system for low speed operation, is sensitive to the variation of the machine parameter, especially the moment of inertia. To estimate the motor inertia value, Reduced-Order Extended Luenberger Observer (ROELO) Is applied. The effectiveness of the proposed ROELO is applied by experiments.

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Measurement of Inertia of Turbocharger Rotor in a Passenger Vehicle (승용차용 터보과급기 로터의 관성모멘트 측정)

  • Chung, Jin Eun;Lee, Sangwoon
    • Transactions of the Korean Society of Automotive Engineers
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    • 제24권1호
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    • pp.33-38
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    • 2016
  • The turbocharger is an essential component to realize the engine down-sizing. The moment of inertia of turbocharger rotor is an important parameter with respect to acceleration performance of the vehicle. It can be calculated from the CAD software based the geometry data and the material properties. But the accurate value of the inertia of turbocharger rotor must be measured through the experimental method. In this study, the measurement of moment of inertia of turbocharger rotor for 2.0 L spark-ignition engine was carried out. First, an experimental equipment using a trifilar method was designed and fabricated. Some optical devices, that is, photo sensor, counter, convex lens, etc, were used to increase the accuracy of the measurement. Second, error sensitivity for the equipment was analyzed. The error of period time and the radius can give big affects to the accuracy of the moment of inertia. When the amount of error of these two were each 1.0 %, maximum error of the moment of inertia was under 3.0 %. Third, the calibration for the equipment was performed using a calibration rotor which has similar shape to turbine rotor but simple. Calculated value from CAD software and measured one for the calibration rotor were compared. The total error of the equipment and the measurement is about 1.3 %. This result shows that the equipment can give the good result with resonable accuracy. Finally the moment of inertia of the turbine rotor and compressor wheel were measured. The coefficient of variations, the ratio of standard deviation to mean value, were reasonably small at 0.57 % and 0.73 % respectively. Therefore this equipment is suitable for the measurement of the moment of inertia of the turbine rotor and compressor wheel.

Free Vibrations of Horizontally Circular Curved Beams with Warping and Rotatory Inertia (워핑과 회전관성을 고려한 원호형 수명 곡선보의 자유진동)

  • 이병구;박광규;오상진
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 한국전산구조공학회 2000년도 봄 학술발표회논문집
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    • pp.308-314
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    • 2000
  • This study explores the free, out-of-plane vibrations of horizontally circular curved beams. The differential equations governing the free vibration of such beams, including the effects of warping and rotatory inertia, are derived and solved numerically. The Runge-Kutta method and the Determinant Search method combined with Regula-Falsi method are used to integrate the differential equations and to obtain the natural frequencies, respectively. The lowest three natural frequencies are calculated over a wide range of non-dimensional system parameters: the horizontal rise to span length ratio, the slenderness ratio, the stiffness parameter, and the warping parameter. It is expected that the results obtained herein can be used practically for the design of curved member systems.

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