• Title/Summary/Keyword: Machine Component

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Development of 6-component Force/Moment Calibration Machine (6분력 힘/모멘트 교정기의 개발)

  • 김갑순;강대임
    • Journal of the Korean Society for Precision Engineering
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    • v.15 no.9
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    • pp.127-134
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    • 1998
  • This paper describes the design of a 6-component force/moment calibration machine with having the maximum capacities of 500 N in forces and 50 Nm in moments. To be used for the characteristic of a multi-component load cell. this machine consists of a body, a fixture, a force generating system, a moment generating system and weights. We have also evaluated the accuracy of the calibration machine. Test results show that the expanded relative uncertainty for force components $\pmFx,\;\pmFy\;and\;moment\;components\;\pmMx,\;\pmMy\;are\;less\; than\;8.6\times10^{-4}$, and force components +Fz, -Fz and moment components $\pmMz\;is\;less\;than\;1.6\times10^{-3},\;2.0\times10^{-5},\;1.7\times10^{-3}$ respectively.

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Optimized Chinese Pronunciation Prediction by Component-Based Statistical Machine Translation

  • Zhu, Shunle
    • Journal of Information Processing Systems
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    • v.17 no.1
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    • pp.203-212
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    • 2021
  • To eliminate ambiguities in the existing methods to simplify Chinese pronunciation learning, we propose a model that can predict the pronunciation of Chinese characters automatically. The proposed model relies on a statistical machine translation (SMT) framework. In particular, we consider the components of Chinese characters as the basic unit and consider the pronunciation prediction as a machine translation procedure (the component sequence as a source sentence, the pronunciation, pinyin, as a target sentence). In addition to traditional features such as the bidirectional word translation and the n-gram language model, we also implement a component similarity feature to overcome some typos during practical use. We incorporate these features into a log-linear model. The experimental results show that our approach significantly outperforms other baseline models.

문형 5축 머시닝센터의 기하학적 오차해석 및 가상가공 시스템 개발

  • 윤태선;조재완;곽병만
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1995.10a
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    • pp.830-835
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    • 1995
  • To quickly determine the effect of the substitute component on the machine's performance is very important in the defign and the manufacturing processes. And minimizing machine cost and maximizing machine quality mandata predictability of machine accuracy. In the study, in order to evaluate the effects of the component's geometric errors and dimensions on the machining accuracy of gantry-type 5-axis machining centers, a geometric error analysis and virtual manufacturing system is developed based on the mathematical model for the shape generation motion of machine tool considering the component's geometric errors and dimensions, the solid modeling techniques and so on.

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Design and Evaluation of Uncertainty for 6-component Force/Moment Calibration Machine (6분력 힘/모멘트 교정기의 설계 및 불확도 평가)

  • 김갑순;강대임;송후근
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1997.04a
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    • pp.68-72
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    • 1997
  • This paper presents the design and the evaluation of the 6-component force/moment calibration machine which h a s t h e maximum capacities of 500 N in forces and 50 Nm in moments. This calibration machine consists of body. fixture. force generating system, moment generating system. The expanded uncertainty of the calibration machine is evaluated by calculating the A type uncertainty. $U_A$ and B type uncertainty, $U_B$. The evaluation results. this system has the expanded uncertainty of less than $2{\times}10^[-2]$ in respective force and moment components.

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Development of a Geometric Error Analysis and Virtual Manufacturing System for Gantry-Type 5-Axis Machining Centers (문형 5축 머시닝센터의 기하학적 오차해석 및 가상가공 시스템 개발)

  • 윤태선;조재완;김석일;곽병만
    • Journal of the Korean Society for Precision Engineering
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    • v.15 no.10
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    • pp.172-179
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    • 1998
  • To quickly determine the effect of the substitute component on the machine's performance is very important in the design and manufacturing processes. And minimizing machine cost and maximizing machine quality mandate predictability of machine accuracy. In this study, in order to evaluate the effects of the component's geometric errors and dimensions on the machining accuracy of gantry-type 5-axis machining centers, a geometric error analysis and virtual manufacturing system are developed based on the mathematical model for the shape generation motion of machine tool considering the component's geometric errors and dimensions, the solid modeling techniques and so on.

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A Behavior Conformance Checker for Component Interfaces using UML State Machine Diagram (UML 상태기계 다이어그램을 이용한 컴포넌트 인터페이스의 행위 호환성 검증 도구)

  • Kim, Ho-Jun;Lee, Woo-Jin
    • The KIPS Transactions:PartD
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    • v.16D no.1
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    • pp.65-72
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    • 2009
  • Component based development has increasingly become important in the software industry. However, in the current component based development approach with UML, the absence of behavioral description of components brings about a cost problem which causes semantic errors on the testing phase. Accordingly we cannot grasp the usage pattern of component by its provided interfaces which refer to an abstraction of software component. And we cannot guarantee the behavioral conformance of the provided and required interfaces of components. In order to solve these problems, we describe the behaviors of component interfaces by state machine diagram and guarantee their behavior conformance at the modeling phase. We also propose a method to guarantee the behavior conformance of component interfaces with concept of observation equivalence and invocation consistency. And we provide an analyzing tool which checks interface behavior conformance.

Sound Based Machine Fault Diagnosis System Using Pattern Recognition Techniques

  • Vununu, Caleb;Moon, Kwang-Seok;Lee, Suk-Hwan;Kwon, Ki-Ryong
    • Journal of Korea Multimedia Society
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    • v.20 no.2
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    • pp.134-143
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    • 2017
  • Machine fault diagnosis recovers all the studies that aim to detect automatically faults or damages on machines. Generally, it is very difficult to diagnose a machine fault by conventional methods based on mathematical models because of the complexity of the real world systems and the obvious existence of nonlinear factors. This study develops an automatic machine fault diagnosis system that uses pattern recognition techniques such as principal component analysis (PCA) and artificial neural networks (ANN). The sounds emitted by the operating machine, a drill in this case, are obtained and analyzed for the different operating conditions. The specific machine conditions considered in this research are the undamaged drill and the defected drill with wear. Principal component analysis is first used to reduce the dimensionality of the original sound data. The first principal components are then used as the inputs of a neural network based classifier to separate normal and defected drill sound data. The results show that the proposed PCA-ANN method can be used for the sounds based automated diagnosis system.

Automatic Extraction of Component Window for Auto-Teaching of PCB Assembly Inspection Machines (PCB 조립검사기의 자동티칭을 위한 부품윈도우 자동추출 방법)

  • Kim, Jun-Oh;Park, Tae-Hyoung
    • Journal of Institute of Control, Robotics and Systems
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    • v.16 no.11
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    • pp.1089-1095
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    • 2010
  • We propose an image segmentation method for auto-teaching system of PCB (Printed Circuit Board) assembly inspection machines. The inspection machine acquires images of all components in PCB, and then compares each image with its standard image to find the assembly errors such as misalignment, inverse polarity, and tombstone. The component window that is the area of component to be acquired by camera, is one of the teaching data for operating the inspection machines. To reduce the teaching time of the machine, we newly develop the image processing method to extract the component window automatically from the image of PCB. The proposed method segments the component window by excluding the soldering parts as well as board background. We binarize the input image by use of HSI color model because it is difficult to discriminate the RGB colors between components and backgrounds. The linear combination of the binarized images then enhances the component window from the background. By use of the horizontal and vertical projection of histogram, we finally obtain the component widow. The experimental results are presented to verify the usefulness of the proposed method.

PM Assisted, Brushless Wound Rotor Synchronous Machine

  • Ali, Qasim;Atiq, Shahid;Lipo, Thomas A.;Kwon, Byung-il
    • Journal of Magnetics
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    • v.21 no.3
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    • pp.399-404
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    • 2016
  • This paper presents a new permanent magnet (PM) assisted topology for a recently introduced brushless wound rotor synchronous machine (BL-WRSM) [1]. The BL-WRSM had a dual-inverter configuration for generating a composite magneto motive force (MMF) with a fundamental component and a subharmonic component. The subharmonic component of the MMF is used for brushless excitation of the rotor. In this paper, additional PMs were introduced on the rotor of the BL-WRSM, making it a hybrid BL-WRSM. We also discussed the flux weakening operation for the hybrid BL-WRSM. The hybrid BL-WRSM offered advantages for starting the machine and provided better performance under full-load conditions. The finite element method (FEM) was used to analyze the performance of the hybrid BL-WRSM, and we compared its performance with BL-WRSM. Finally, prototypes were built with and without the PM-assistance, and experiments were conducted to demonstrate their performance.

Kinematic calibration for parallel micro machine platform (마이크로 병렬기구 플랫폼의 기구학적 보정)

  • 강득수;김종원
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2004.10a
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    • pp.969-972
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    • 2004
  • This paper describes the mechanism of parallel micro machine platform and its feedback control system for acquiring high accuracy. The parallel micro machine platform that has developed has 5x5x5 work-space and sub-micron accuracy. For the high accuracy, the feedback control system is important but errors in machining and assembling are inevitable. Kinematic calibration is important for this reason. In this paper, various error components are introduced and the effects of error component are analyzed.

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