• Title/Summary/Keyword: Inverse analysis program

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

  • Park, Min-Seok;Jo, Byung-Wan;Lee, Myung-Kue
    • Journal of the Korean Society of Safety
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    • v.21 no.4 s.76
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    • pp.95-101
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    • 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.

A study on the estimation of the optimal number of monitoring points in single-track tunnel lining with the inverse analysis program (역해석 프로그램에 의한 단선터널 라이닝의 최적 계측 측점수 산정 연구)

  • Woo, Jong-Tae
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.16 no.1
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    • pp.1-11
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    • 2014
  • In order to determine the optimal number of monitoring points in single-track tunnel lining, this thesis compares and evaluates the results of two cases: when the tunnel lining is modeled into a simple beam form and then is applied to 1) the tunnel lining inverse analysis program, and to 2) the commercially-used program. The displacement and stress of specific tunnel lining cross-sections are determined by entering the load conditions into the commercially-used program for tunnel interpretations. In doing so, two cases were assumed: where a symmetrically-distributed load was acting upon the tunnel lining of a single-track tunnel and where an asymmetrically-distributed load was in action. By comparing the computed displacement with the stress and displacement determined by entering side numbers 3, 5, and 7 into the tunnel lining inverse analysis program, the optimal number of monitoring points is determined. From the results of the research, it can be inferred that the number of monitoring points needs to be at least 5 points, considering the efficiency of monitoring in practice and the loss-and-damage rate of tunnel monitoring.

Inverse design of Aircraft Engine Turbine Blades. (항공기 가스터빈 엔진의 터빈 날개의 역설계)

  • Kang Young-Seok;Kang Shin-Hyoung
    • Proceedings of the KSME Conference
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    • 2002.08a
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    • pp.603-606
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    • 2002
  • Numerical analysis and its inverse design process of 2nd stage of JT8D aircraft engine is described. One of the most important factors that affect the performante of turbomachine is secondary flow in the blade passage, so that the performance of turbomachine can be improved by controlling secondary flow. In this paper, as a method to control secondary flow, commercial inverse design program, TurboDesign is used. Meridional derivative of angular momentum is selected as a parameter to control blade leading in this program, To validate inverse designed model, computational analysis is applied which includes rotor-stator-interaction. In this paper, CFB results of both original and inverse designed model are compared to examine how much the performance improves without reduction of work output.

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Kinematic Analysis and Simulation of an Automatic feeding Mechamism subjected by A Curvilinear Inverse Cam(II) (곡선 캠을 이용한 자동이송장치의 기구해석 및 Simulation용 CAD 프로그램 개발(II))

  • Sin, Jung-Ho;Ryu, Gap-Sang
    • 한국기계연구소 소보
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    • s.17
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    • pp.93-97
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    • 1987
  • This paper is concerned on kinematic analysis and simulation of an automatic feeding mechanism and a curved inverse earn. The main objective is the development 0 fan algorithm of the earn-feeding mechanism and a CAD program. The computer program CACAFS (Computer-Aided Cam and Automatic Feeding System) is developed by using the state-of-the-art for CAD. Thus, the program CACAFS is independent of computer hardwares and also interactive. As the second part of paper, this paper introduces the technique for the mechanism simulation and graphics-oriented CAD programming. The first part of r paper presents the algorithm to analyze the motion of the inverse earn and the automatic feeding mechanism.

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Kinematic Analysis and Simulation of an Automatic feeding Mechamism subjected by A Curvilinear Inverse Cam(I) (곡선 캠을 이용한 자동이송장치의 기구해석 및 Simulation용 CAD 프로그램 개발(I))

  • Sin, Jung-Ho;Choe, Yeong-Hyu;No, Chang-Su
    • 한국기계연구소 소보
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    • s.17
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    • pp.83-91
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    • 1987
  • This paper is concerned on kinematic Analysis and Simulation of an automatic feeding mechanism and a curved inverse cam. The main objective is the development of an algorithm of the cam-feeding mechanism and a CAD program. The computer program CACAFS (Computer-Aided Cam and Automatic Feeding System is developed by using the state-of-the-art for CAD. Thus, the program CACAFS is independent of computer hardwares and also interactive. As the first part of paper, this paper introduces the algorithm to analyze the motion of the inverse cam and the automatic feeding mechanism. The second part of paper presents the technique for the mechanism simulation and graphics-oriented CAD programming.

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Three Dimensional Modeling and Inverse Dynamic Analysis of An Excavator (굴삭기의 3차원 모델링 및 역동역학 해석)

  • 김외조;유완석;이만형;윤경화
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.17 no.8
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    • pp.2043-2050
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    • 1993
  • This paper presents a three dimensional modeling and dynamic analysis of a hydraulic excavator. An excavator composed of a boom, a bucket, two boom cylinders, an arm cylinder, and a bucket cylinder is used for the analysis. Each cylinder is modeled to two separate bodies linked by a translational joint. Judging from the actual degrees of freedom of the excavator, proper kinematic joints are selected to exclude redundant constraints in the modeling. In order to find the reaction forces at kinematic joints during operations, inverse dynamic analysis is carried out. Dynamic analysis is also carried out to verify the results from inverse dynamic analysis. The DADS program is used for analysis, with proper modification of the DADS user routine according to various motions.

Dynamic analysis of an wheel loader manipulator by experimental data (실험결과를 이용한 휠로더 작업장치부의 동역학 해석)

  • Ko, Kyung-Eun;Kim, Heui-Wion;Bae, Jong-Gug;Yoo, Wan-Suk
    • Proceedings of the KSME Conference
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    • 2004.04a
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    • pp.881-886
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    • 2004
  • This paper presents the inverse dynamic analysis of the wheel loader manipulator based on the experimental data. A three dimensional rigid multi-body model of the wheel loader manipulator was built up. The inverse dynamic analysis for the typical operation mode was carried out by the ADAMS program. In order to verify the analysis result with the measured one, the hydraulic pressure and displacements of the cylinders were measured and the inverse dynamic analysis was carried out using experimental data. From the results of the analysis and measurement, it was concluded that the computational driving force showed good agreement with the measured one.

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Inverse Kinematics of Complex Chain Robotic Mechanism Using Ralative Coordinates (상대좌표를 이용한 복합연쇄 로봇기구의 역기구학)

  • Kim, Chang-Bu;Kim, Hyo-Sik
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.20 no.11
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    • pp.3398-3407
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    • 1996
  • In this paper, we derive an algorithm and develope a computer program which analyze rapidly and precisely the inverse kinematics of robotic mechanism with spatial complex chain structure based on the relative coordinates. We represent the inverse kinematic problem as an optimization problem with the kinematic constraint equations. The inverse kinematic analysis algorithm, therefore, consists of two algorithms, the main, an optimization algorithm finding the motion of independent joints from that of an end-effector and the sub, a forward kinematic analysis algorithm computing the motion of dependent joints. We accomplish simulations for the investigation upon the accuracy and efficiency of the algorithm.

Evaluation of Cancer Detection Efficiency by Means of Hybrid and Inverse Filter in Chest Radiography (디지털 흉부 방사선 영상에서 Hybrid Filter와 Inverse Filter를 적용한 종양의 검출능 평가)

  • Kim, Youn-Young;Kim, Tae-Young;Kim, Hyun-Ji;Park, Min-Seock;Kim, Jung-Min
    • Journal of radiological science and technology
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    • v.36 no.4
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    • pp.319-326
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    • 2013
  • The purpose of this study is to evaluate usefulness of Hybrid image and Inverse image about detection of tumor shadow in chest radiography using ROC analysis. Original images of 60 cases are selected from Standards digital image date base issued by the Japanese Society of Radiological Technology. Through computer language of C, Inverse images of 60 cases and Hybrid image of 30 cases are made. The continues reading experiment was conducted. In the case of inverse image were observed by 5 radiographer and 2 radiologist. In the case of In case of Hybrid image were observed by 3 student radiographer and 2 experienced radiographer. ROC curve are constructed using ROCKIT Program made by Metz. In Inverse image, a Az of average ROC curve was increases from 0.742 of original image to 0.775 of inverse image. In normal cases, the effect of the detrimental is same to that of the beneficial, however In abnormal cases, the beneficial effect is greater than detrimental effect. However in Hybrid image, a Az of average ROC curve was decreases from 0.5253 of original image to 0.4868 of Hybrid image. In Normal cases, the effect of the detrimental is greater than that of the Beneficial, however In abnormal cases, the Beneficial effect is greater than detrimental effect. The inverse image can be more positively considered for the detecting of tumor than the hybrid image.

Dynamic analysis of an excavator manipulator by experimental data (실험결과를 이용한 굴삭기 작업장치부의 동역학 해석)

  • Hong, Je-Min;Kim, Heui-Won;Kim, Dong-Hae
    • Proceedings of the KSME Conference
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    • 2003.04a
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    • pp.711-716
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    • 2003
  • This paper presents the inverse dynamic analysis of the hydraulic excavator manipulator based on the experimental data. A three dimensional rigid multi-body model of the hydraulic excavator manipulator was built up. Inverse dynamic analysis for typical operation mode was carried out by the ADAMS program. In order to verify the analysis results with the measured, the hydraulic pressure and displacement of the cylinders were measured and the dynamic analysis was carried out using experimental data. From the results of the cylinder driving forces, good agreements are obtained between the analysis and the measurement.

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