• 제목/요약/키워드: inverse design

검색결과 771건 처리시간 0.027초

페루프를 포함하는 다물체계에 있어서 구동방법에 따른 구동력 및 조인트 반력 해석 (Analysis of Actuating and Joint Reaction Forces for Various Drivings in Multibody Systems with Closed-Loops)

  • 이병훈;최동환
    • 대한기계학회논문집A
    • /
    • 제24권6호
    • /
    • pp.1470-1478
    • /
    • 2000
  • Analysis of actuating forces and joint reaction forces are essential to determine the capacity of actuators, to control the system and to design the components. This paper presents an algorithm tha t calculates actuating forces(or torques) depending on the various driving types to produce a given system motion. The joint reaction forces(or torques) of multibody systems with closed-loops are analyzed in the Cartesian coordinate space using the inverse velocity transformation technique. Two numerical examples were carried out to verify the algorithm proposed.

온도분포 역해석 프로그램을 이용한 PSC 박스거더 교량 단면의 온도 분포 해석 (Temperature Analysis of PSC Box-girder Bridges Using Inverse Thermal Analysis Program)

  • 박민석;조병완;이명규
    • 한국안전학회지
    • /
    • 제21권4호
    • /
    • pp.95-101
    • /
    • 2006
  • It is well known that the thermal load in PSC(prestressed concrete) box-girder bridge is the principal cause of detrimental crack. The longitudinal stress caused by the lateral stress from the temperature gradient in slab of PSC box-girder bridge has a considerable influence on the durability and economy of bridge structures. As the basic study for the rational consideration of thermal load and the derivation of design guide, the inverse thermal analysis program for PSC box-girder bridges using field measurement data is developed. In this paper, thermal analyses are performed using field monitoring data for the sample PSC box-girder bridge. It is proposed that the link between monitoring program and the inverse analysis program is available.

Hysterersis Compensation in SMA Actuators Through Numerical Inverse Preisach Model Implementation

  • Kha, Nguyen-Bao;Ahn, Kyoung-Kwan
    • 제어로봇시스템학회:학술대회논문집
    • /
    • 제어로봇시스템학회 2005년도 ICCAS
    • /
    • pp.2048-2053
    • /
    • 2005
  • The aim of this paper is to compensate hysteresis phenomena in Shape Memory Alloy (SMA) actuators by using numerical inverse Preisach model. This is used to design a controller that correct hysteresis effects and improve accuracy for the displacement of SMA actuators. Firstly, hysteresis is identified by numerical Preisach model implementation. The geometrical interpretation from first order transition curves is used for hysteresis modeling. Secondly, the inverse Preisach model is formulated and incorporated in open-loop control system in order to obtain desired input-output relationship with hysteresis reducing. The experimental results for hysteresis compensation by using this method are also shown in this paper.

  • PDF

케이블 돔 구조물 설계를 위한 수치해석 방법 (A Numerical Analysis Approach for Design of Cable Dome Structures)

  • 김재열;장동우
    • 한국공간구조학회:학술대회논문집
    • /
    • 한국공간구조학회 2008년도 춘계 학술발표회 논문집
    • /
    • pp.89-94
    • /
    • 2008
  • This paper deals with the method of self-equilibrium stress mode analysis of cable dome structures. From the point of view of analysis, cable dome structure is a kind of unstable truss structure which is stabilized by means of introduction of prestressing. The prestress must be introduced according to a specific proportion among different structural member and it is determined by an analysis called self-equilibrium stress mode analysis. The mathematical equation involved in the self-equilibrium stress mode analysis is a system of linear equations which can be solved numerically by adopting the concept of Moore-Penrose generalized inverse. The calculation of the generalized inverse is carried out by rank factorization method. This method involves a parameter called epsilon which plays a critical role in self-equilibrium stress mode analysis. It is thus of interest to investigate the range of epsilon which produces consistent solution during the analysis of self-equilibrium stress mode.

  • PDF

이족 로봇의 위치 이동: 정보행 대 동보행 (Locomotions of a Biped Robot: Static vs. Dynamic Gaits)

  • 임승철;고인환
    • 대한기계학회논문집A
    • /
    • 제30권6호
    • /
    • pp.643-652
    • /
    • 2006
  • This paper is concerned with computer simulations of a biped robot walking in static and dynamic gaits. To this end, a three-dimensional robot is considered possessing a torso and two identical legs of a typical design. For such limbs, a set of inverse kinematic solutions is analytically derived between the torso and the feet. Specific walking patterns are off-line generated meeting stability based on the VPCG or ZMP condition. Subsequently, to verify whether the robot can walk as planned in the presence of mass and ground effects, a multi-body dynamics CAE code has been applied to the resulting joint motions determined by inverse kinematics. As a result, the key parameters to successful gaits could be identified including inherent characteristics as well. Upon comparisons between the two types of gaits, dynamic gaits are concluded more desirable for larger humaniods.

제한된 범위의 역산란 포텐셜을 갖는 Gel'fand-Levitan-Marchenko 적분방정식의 해와 유전율 분포 합성에의 응용 (Solution of Gel'fand-Levitan-Marchenko Integral Equation with Restricted Inverse Scattering Potential and Its Applications to Synthesis of Dielectric Constant Distribution)

  • 장완규;정현수;박의준
    • 한국전자파학회:학술대회논문집
    • /
    • 한국전자파학회 2003년도 종합학술발표회 논문집 Vol.13 No.1
    • /
    • pp.54-58
    • /
    • 2003
  • In this study, the solution of Gel'fand-Levitan-Marchenko integral equation in the inverse scattering problem is efficiently solved for arbitrarily specified spectra pattern which are reflected from the restricted potential. The procedure is based on the successive approach without iterations. This method lessens the truncation errors which plague conventional design schemes using specific windows for reflection coefficients. It is shown that the method is adequate for the synthesis of the continuously varying one-dimensional potential of the nonuniformly distributed dielectric constants.

  • PDF

유니트 일치된 자코비안 행렬을 이용한 병렬구조 로봇의 힘전달 해석 (Inverse and Forward Force Transmission Analyses of Parallel Manipulators using Dimensionally Homogeneous Jacobian Matrices)

  • 김성관;류제하
    • 대한기계학회:학술대회논문집
    • /
    • 대한기계학회 2003년도 추계학술대회
    • /
    • pp.1500-1505
    • /
    • 2003
  • In order to avoid the unit inconsistency problem in the conventional Jacobian matrix, previously we presented new formulation of a dimensionally homogeneous inverse Jacobian matrix for parallel manipulators with a planar mobile platform by using three end-effector points based on the velocity relationship [1]. This paper presents force relationships between joint forces and Cartesian forces at the three End-Effector points. The derived force relationships can then be used for analyses of the input/output force transmission. These analyses, forward and inverse force transmission analyses, depend on the singular values of the derived dimensionally homogeneous Jacobian matrix. Using the proposed force relationship, a numerical example is presented for actuator size design of a 3-RRR planar parallel manipulator.

  • PDF

전기트리거용 Inverse Pinch Switch의 특성에 관한 연구 (A Study on Characteristic of a Electrically Triggered Inverse Pinch Switch)

  • 김영배;조국희;이홍식;임근희
    • 대한전기학회:학술대회논문집
    • /
    • 대한전기학회 2002년도 하계학술대회 논문집 C
    • /
    • pp.1766-1768
    • /
    • 2002
  • The current density in the IPS(Inverse Pinch Switch) is 1/62 times less than that in the spark gap. It was shown that in comparison with the spark gap, the switch inductance of the IPS is largely reduced and the useful lifetime is significantly increased. In the paper, the design technology of a closing switch, especially IPS triggered by electrical signal for pulsed power system with a very high voltage and current is presented.

  • PDF

OpenFOAM 과 VisualDoc 을 이용한 역열전도 문제의 해석 (Analysis of Inverse Heat Conduction Problem Using OpenFOAM and VisualDoc)

  • 김성원;김선경
    • 대한기계학회논문집B
    • /
    • 제37권6호
    • /
    • pp.539-544
    • /
    • 2013
  • 본 연구는 공개 해석프로그램과 상용 최적화 프로그램을 연계하여 역열전도 문제를 해결하는 방법론을 제시하고 구현하였다. 이 해석 방법은 구동이 간단하며, 내부 코딩 없이도 구동이 가능하기 때문에 다른 연구자들도 쉽게 역열전도 문제를 재현할 수 있다.

근사화 inverse 시스템을 사용한 비최소 위상플랜트의 적응제어기 설계 (The Design of Adaptive Controller for Nonminimum-Phase System using Approximate Inverse System)

  • 오현철;김윤상;좌종철;이재춘;김재일;안두수
    • 대한전기학회:학술대회논문집
    • /
    • 대한전기학회 1997년도 하계학술대회 논문집 B
    • /
    • pp.575-577
    • /
    • 1997
  • This paper presents a approach to the adaptive control of nonminimum-phase continuous-time systems. It is shown that pole-zero cancellations can be avoided by using approximate inverse systems. The computer simulation results are presented to illustrate the effectiveness of the proposed method.

  • PDF