• Title/Summary/Keyword: Design of measurement system

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A Study on Weld Bead Profile Measurement System for Use in Automatic Weld Bead Removal System

  • Lee, Jeong-Woo;Lee, Eun-Hyun
    • 제어로봇시스템학회:학술대회논문집
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    • 1999.10a
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    • pp.194-197
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    • 1999
  • Automatic weld bead removal system is consisted of bead removal tool, bead profile measurement system and tool motion control system. In this paper, design of weld bead profile measurement system which is used for automatic weld bead removal system is described. The system measures the weld bead position, normal vector of the auto-body and weld bead profile. The optical sensor with structured laser beam is used as a sensor and comparison of the sensor that can be used for this purpose is discussed in detail. The measurement process and the related software developed for this purpose are also described. A median filter, average filter and long line filters are used and their effects in bead profile measurement are discussed. The measurement system is integrated into automatic bead removal system and is used to remove weld bead in rear pillar of automotive body. The whole system operates well in automotive body assembly line and thus the system is proved to be good for this purpose.

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A design concept on object database of measurement data for building a safety management network of road bridges (도로 교량의 안전관리 네트워크 구축을 위한 계측자료의 객체 데이터베이스 설계 개념)

  • Park, Sang-Il;An, Hyun-Jung;Kim, Hoy-Jin;Lee, Sang-Ho
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2008.04a
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    • pp.518-523
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    • 2008
  • In this study, we analyzed applicability of object database, designed the concept model based on object-oriented idea for measurement data management, and applied the design model to object database. The concept model composes three sub models Infrastructure managing information model, Infrastructure measurement data model, and Measurement unit model. The process to expand measurement data of new type was executed easily without changing database schema in object database. The process to expand measurement data of new type was executed easily without changing database schema in object database. Therefore, applicability of new technology to infrastructures for building a safety management network of road bridges could be increased with object database system.

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An Output Feedback Controller for a Ball and Beam System under Measurement Noise of Feedback Sensor (센서에 측정에러가 있는 볼-빔 시스템의 출력 궤환 제어기)

  • Kim, Hyun-Do;Choi, Ho-Lim
    • Journal of Institute of Control, Robotics and Systems
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    • v.17 no.10
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    • pp.955-959
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    • 2011
  • In this paper, we assume that an output sensor of a ball and beam system is coupled with AC measurement noise. We propose an output feedback controller for a ball and beam system under measurement noise of feedback sensor. Measurement noise makes feedback signals distorted, and results in performance degradation or even system failure. Therefore, we need to design a robust controller to accommodate the possible measurement noise in the feedback information. Our controller is equipped with a gain-scaling factor to minimize the effect of measurement noise in output feedback information. We give an analysis of the controlled system and illustrate the improved control performance via simulation and experiment for a ball and beam system.

DVL-RPM based Velocity Filter Design for a Performance Improvement Underwater Integrated Navigation System (수중운동체 복합항법 성능 향상을 위한 DVL/RPM 기반의 속도 필터 설계)

  • Yoo, Tae Suk;Yoon, Seon Il
    • Journal of Institute of Control, Robotics and Systems
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    • v.19 no.9
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    • pp.774-781
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    • 2013
  • The purpose of this paper is to design a DVL-RPM based VKF (Velocity Kalman Filter) design for a performance improvement underwater integrated navigation system. The proposed approach relies on a VKF, augmented by a altitude from Echo-sounder based switching architecture to yield robust performance, even when DVL (Doppler Velocity Log) exceeds the measurement range and the measured value is unable to be valid. The proposed approach relies on two parts: 1) Indirect feedback navigation Kalman filter design, 2) VKF design. To evaluate proposed method, we compare the results of the VKF aided navigation system with simulation result from a PINS (Pure Inertial Navigation System) and conventional INS-DVL method. Simulations illustrate the effectiveness of the underwater navigation system assisted by the additional DVL-RPM based VKF in underwater environment.

Understanding and Reducing Performance Variation in New Product Development Using Paper Helicopter Experiment (종이 헬리콥터 실험을 통한 개발단계 성능변동의 이해와 개선)

  • Shin, Byung-Cheol;Kim, Si-Ung;Jeong, Sun Min;Byun, Jai-Hyun;Nam, Yong-Seog
    • Journal of Korean Society for Quality Management
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    • v.43 no.4
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    • pp.589-606
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    • 2015
  • Purpose: In developing new products, reducing performance variation is important for competitiveness factors such as quality, cost, and delivery. This paper aims at evaluating three performance variations; measurement, performance evaluation, and manufacturing variations, and then improving product and process design, focused on paper helicopter making case study. Methods: For measurement system analysis, gage R&R (repeatability and reproducibility), linearity, stability are evaluated. Since gage R&R are not satisfactory, the measurement system is improved by adopting voice memos application of iPhone and providing standard measurement procedure. To evaluate performance variation, product deterioration and environment factor (wind speed) is considered. Since the existing design is sensitive to these noise factors, a new product design is developed, which is proven to be robust to the noise factors. Finally, manufacturing variations are evaluated with five factors which can cause variation in flight time. To reduce the impact of three significant factors, three improvement methods are applied. Results: Three performance variations are evaluated and robust paper helicopter design is presented. Conclusion: To reduce measurement and process variations, improved measurement method and paper helicopter making procedure are proposed. A new product design is also presented which is robust to deterioration and environmental variation. This paper is expected to benefit students and practitioners who want to have hands-on knowledge on new product quality improvement.

Optimal Placement of Measurement Using GAs in Harmonic State Estimation of Power System (전력시스템 고조파 상태 춘정에서 GA를 미용한 최적 측정위치 선정)

  • 정형환;왕용필;박희철;안병철
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.52 no.8
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    • pp.471-480
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    • 2003
  • The design of a measurement system to perform Harmonic State Estimation (HSE) is a very complex problem. Among the reasons for its complexity are the system size, conflicting requirements of estimator accuracy, reliability in the presence of transducer noise and data communication failures, adaptability to change in the network topology and cost minimization. In particular, the number of harmonic instruments available is always limited. Therefore, a systematic procedure is needed to design the optimal placement of measurement points. This paper presents a new HSE algorithm which is based on an optimal placement of measurement points using Genetic Algorithms (GAs) which is widely used in areas such as: optimization of the objective function, learning of neural networks, tuning of fuzzy membership functions, machine learning, system identification and control. This HSE has been applied to the Simulation Test Power System for the validation of the new HSE algorithm. The study results have indicated an economical and effective method for optimal placement of measurement points using Genetic Algorithms (GAs) in the Harmonic State Estimation (HSE).

Structural Design and Analysis of Measurement Sensor of Automotive Exhaust System (자동차 배기관 시스템 계측 센서의 구조 설계 및 해석)

  • Kim, Sangkee;Lee, Sunhee;Park, Hyunbum
    • Journal of Aerospace System Engineering
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    • v.10 no.1
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    • pp.82-85
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    • 2016
  • In this study, structural design of exhaust gas sensor of automobile was performed. In order to evaluate the structural design of the measurement sensor, the structural analysis was performed by the finite element method. The vibration and thermal stress analysis was carried out at the high temperature condition. Finally, the structural test of sensor system was performed, and used for comparison with the analyzed model. Through the structural analysis and test, it is confirmed that the designed measurement sensor structure is acceptable.

Rock Displacement Measurement System by Precise Vision Metrology (정밀 화상계측법을 이용한 암반변위 계측시스템)

  • Hwang, Jae-Yun
    • Tunnel and Underground Space
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    • v.21 no.6
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    • pp.450-459
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    • 2011
  • For the purpose of evaluating the safety of rock structures such as underground caverns, tunnels and slopes, rock displacement measurement is carried out to identify the behavior of rock masses. Tapes, levels, and total stations are usually applied to the displacement measurement. These tools, however, are weighed down by many disadvantages. In this study, a new displacement measurement system by precise vision metrology was proposed for the observational design and construction method of rock structures, and then applied to a tunnel under construction. Comparisons and investigations of the measurement of the tunnel have confirmed the effectiveness and applicability of the developed measurement system.

Development of a Noncontact Three Dimensional Foot Form Measurement System with Optical Triangulation (광삼각법을 이용한 비접촉 3차원 족형 측정 시스템 설계)

  • 박인덕;안형회;송강석;이희만;김시경
    • Journal of Institute of Control, Robotics and Systems
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    • v.9 no.5
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    • pp.368-373
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    • 2003
  • This paper presents a cost-effective 3D foot scanner system that provides the 3-dimensional point cloud foot data to design the custom footwear. To measure the 3-dimensional point cloud data of the foot, a CCD camera, a Non-Gaussian laser line projector and optical triangulation method are employed. Furthermore, the integrated system employs a measurement base, a frame grabber, a CCD moving cart, a stepping motor and a computer. The measurement result is saved as 3D dxf format and it could be converted to 2D essential data fer a shoe design. The experimental results demonstrate that the proposed system have the decent resolution of 1mm which is enough for last and shoe design.

A Study on the Measurement System Design for Measuring Properties of AC Magnetic Field Sensor (교류 자기센서 특성 시험장치 설계에 관한 연구)

  • Chung, Hyun-Ju;Yang, Chang-Seob;Jung, Woo-Jin
    • Journal of the Korea Institute of Military Science and Technology
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    • v.18 no.3
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    • pp.244-252
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    • 2015
  • This paper describes design and construction results of the measurement system developed on the purpose of measuring properties of AC magnetic field sensors used in the weapon system. The system for measuring the properties of AC magnetic field sensors consist of 3-axis helmholtz coil, signal generator, signal amplifier, sensor data acquisition unit and AC magnetic field sensor property measurement & analysis equipment including the operating software. By using this system, we can measure various properties of AC magnetic field sensor such as sensitivity, linearity and dynamic response in the frequency from 1 Hz to 10 kHz. Finally we also verified its performance by measuring the property of a MAG 639, standard magnetic field sensor of bartington instruments, with the developed measurement system.