• 제목/요약/키워드: Device for Measuring Load

검색결과 92건 처리시간 0.027초

고정밀 전기식 힘측정기의 불확도평가 절차 및 응용 (Procedure for Uncertainty Evaluation of a Precision Electric Force Measuring Device and Its Application)

  • 김갑순;강대임
    • 한국정밀공학회지
    • /
    • 제16권12호
    • /
    • pp.161-167
    • /
    • 1999
  • This paper describes the calibration method and the calculation equations of expanded uncertainty for a precision electric force measuring device. The calibration of the electric force measuring device is performed three times (0 ${\circ}$(first time), $120{\circ}$(second time), $240{\circ}$(third time)) at each calibration point. It is usually selected ten points from zero load to rated load of the electric force measuring device. The expanded uncertainty is calculated by combining A type standard uncertainty and B type standard uncertainty. The calibration method and the calculation equations of expanded uncertainty can be widely used in the calibration of the precision electric force measuring device.

  • PDF

태양광 패널 재사용을 위한 가변 정전류 기반의 효율 측정장치에 관한 연구 (Research on Variable Constant Current Efficiency Measuring Device for Solar Panel to Reuse)

  • 우상진;김대헌;이재진;권오민
    • 대한임베디드공학회논문지
    • /
    • 제18권1호
    • /
    • pp.9-17
    • /
    • 2023
  • This paper relates to the development of a device for measuring the efficiency of a solar panel based on a variable constant current, and proposed a standard for reuse of the solar panel. By applying a variable constant current circuit to a solar panel efficiency measuring device, it was easy to apply a maximum power point tracking (MPPT) algorithm. In addition, a load dispersion method was applied to measure the efficiency of a high-capacity solar panel. and it is possible to solve a problematic thermal runaway during a MOSFET parallel operation by applying the load dispersion method. As a result of the experiment, the solar panel efficiency measuring device was able to accommodate a large solar panel of 350W, which is the maximum measurement goal. In this paper, the validity was confirmed through the 310W solar panel efficiency measurement experiment collected after removal.

중량선과기(重量選果機)의 중량감지부(重量感知部) 개선(改善)에 관(關)한 연구(硏究) (Development of Weight Sensing Unit of Fruit Weight Grader Using Load Cell)

  • 김효수;고학균
    • Journal of Biosystems Engineering
    • /
    • 제18권4호
    • /
    • pp.358-370
    • /
    • 1993
  • In Korea, fruit grading has been mainly done manually, and manual grading depends on human sense. Thus it is subjected to human error and is not always as consistent as would be desired. Therefore, a study on the development of fruit grader was initiated to improve the consistency of fruit grading. The sensitivity for fruit weight of the conventional spring type weight grader has a tendency to decrease by physical characteristics of spring which is used as a weight sensing unit. This study was carried out to develop weight measuring device for establishing the base of weight sensing unit of electronic weight grader. This device consists of a weight sensor using load cell, data acquisition system, and a microcomputer containing program to calculate fruit weight. The weight measuring device using load cell was developed to increase sensitivity of fruit weight. The result of this study showed that the weight sensing unit of electronic weight grader contributed to the improvement of performance of weight measuring device.

  • PDF

로드셀과 토크암을 이용한 대용량 토크 측정장치 개발에 관한 연구 (Development of device measuring very high torque via torque arm with attached load cells)

  • 이용범;한승호
    • 유공압시스템학회논문집
    • /
    • 제7권1호
    • /
    • pp.6-10
    • /
    • 2010
  • A measurement of very high torque for track drive unit in construction equipment is usually in difficulties due to the requirement of a torque meter with high capacity, and the limitation of geometry for an experimental set-up. To improve the troublesome problem, a new device was proposed, where a torque transmitted through the torque arm can be measured by load cells attached at each torque arm. The experimental set-up of the new device was carried out in order to measure the torque values for a mechanical feedback type planetary gear box, in which the power flow circulates itself in a closed-loop. The new device enables to measure torque values of 60,000Nm. Additionally, the measured values were estimated statistically in the aspect of their repeatability and reproducibility, so that an acceptable behaviour as a measuring device can be confirmed.

  • PDF

Strain Gaged와 A/D 변환기를 이용한 하중, 변형률 측정장치 제작 (Design and Assembling of Load and Strain Measuring Equipment using Strain Gage and A/D Converter)

  • 박태근;양민복;백태현
    • 한국정밀공학회:학술대회논문집
    • /
    • 한국정밀공학회 2006년도 춘계학술대회 논문집
    • /
    • pp.293-294
    • /
    • 2006
  • The conventional strain measuring device is costly and complicated - it is not simple to understand its structure. Hence, strain gage and the A/D converter are assembled to come up with a load and a strain measuring device. The device was tested for measuring the strain in a loaded specimen and the experimental results were compared to those obtained by a commercial strain indicator.

  • PDF

Development of a Musculoskeletal Load Measuring Device for Construction Workers Based on Accelerometers and Gyro Sensors

  • Kim, Kyoon-Tai
    • 한국건축시공학회지
    • /
    • 제11권6호
    • /
    • pp.618-626
    • /
    • 2011
  • The characteristics of construction work cause excessive strain on specific body parts of the construction craft workers. However, there are few tools to mane an accurate measurement of the load on the musculoskeletal system, and the musculoskeletal disorders (MSDs) experienced by the workers have not been properly understood. So, there is an urgent need for development of a tool to measure the load on the musculoskeletal system. Therefore, this research aims to develop a musculoskeletal load measuring device for construction workers. In order to eliminate the noise and errors, an accelerometer, gyro sensors and the Kalman Filter are used in the device developed in this research.

디지털 원추관입기 개발 (Development of a Digital Cone Index Measuring Device)

  • 이규승;이동훈;조용진;정선옥;박원엽;노광모;장영창
    • Journal of Biosystems Engineering
    • /
    • 제35권6호
    • /
    • pp.387-392
    • /
    • 2010
  • This study was performed to design and to construct a digital soil cone index(CI) measuring device replacing conventional analog type devices. The device developed in the study consisted of a load cell, a rotary encoder and a motor with a decelerator as its main parts. The cone speed was controlled lower than 3.0 m/s which keeps the standard suggested by the ASABE S313.3 specification. The experiment was conducted in a soil bin system as well as in various fields. The CI data measured by the developed device were compared with those by an existing measurement device(SC900, Spectrum, USA). Based on the experiments at various field conditions, the CI measuring characteristic of the device was quite similar to that of the conventional device within a acceptable $R^2$ range of more than 0.5(mean=0.76). It was concluded that the digital cone index measuring device was an effective and comprehensive sensor for measuring soil strength.

하중 가변형 전동 프레스를 이용한 차량용 클러치 디스크 쿠션 변위량 측정 장치 개발 (Development of Vehicle Clutch Discs Cushion Variation Measurement Device Using a Variable Load Electric Press)

  • 박승규;최해운
    • 한국기계가공학회지
    • /
    • 제15권6호
    • /
    • pp.64-69
    • /
    • 2016
  • Vehicle clutch measurement for disc cushion variation was developed for the production of high quality Dual clutch transmissions. The developed device is composed of load cells for load measurement and LVDT for measuring the distance variation measurement in cushion variation. The servo motor-driven electric press for flexible loads that was developed was controlled by a PC-based HMI system, LabVIEW, and the device was able to continuously record real time measurement data with the accuracies of ${\pm}0.1\;kgf$ load and ${\pm}5{\mu}m$ cushion amount, which is far above the requirements of commercial vehicle standards.

수송 기술에 적합한 학습용 풍동의 힘 측정 장치 개발 (Development of Force Measuring Device in Learning Wind Tunnel Used for Transportation Technology Class)

  • 최준섭;이성구
    • 대한공업교육학회지
    • /
    • 제32권1호
    • /
    • pp.117-133
    • /
    • 2007
  • 이 연구는 중등학교 학생들에게 비행의 원리를 이해하고 항공 기술 분야에 흥미를 가질 수 있도록 하기 위해 학교 현장에 적용 가능한 교수-학습 자료인 학습용 풍동의 힘 측정 장치를 개발하였다. 연구의 내용은 학습용 풍동의 힘 측정 장치 개발과 실험으로 이루어져 있다. 이 연구에서 얻은 주요 결과를 정리하면 다음과 같다. 공과대학 기계계열 학과나 항공연구소 등에서 사용하는 고가의 Load cell을 이용한 장치 대신에 지렛대 원리를 활용한 간단한 구조이다. 종합된 하나의 장치로 양력, 항력 및 유체 저항 비교 실험이 가능하다. 에어포일 받음각에 따른 양력 계수는 실험값과 이론값이 전체적으로 비슷한 경향성을 갖으며, 실속 현상은 실험값이 이론값보다 더 큰 받음각에서 나타났다. 에어포일 받음각에 따른 항력 계수는 실험값과 이론값이 전체적으로 비슷한 경향성을 갖으며, 실험값은 이론값에 비해 항력 계수의 증가 비율이 완만하게 증가하였다.

스트레인 게이지 계측용 차동 증폭기와 A/D 변환기를 이용한 트러스 구조물의 내력 측정 장치 설계 (Design of Load and Strain Measuring Equipment Using Strain Gage, Instrumental Differential Amplifier and A/D Converter in a Truss System)

  • 백태현;이병희
    • 비파괴검사학회지
    • /
    • 제28권2호
    • /
    • pp.217-224
    • /
    • 2008
  • 트러스는 교량이나 건축물 설계 등에 많이 사용되는 구조물로서 기본적인 설계요소이며, 설계자는 이러한 구조물의 원리를 완전히 이해하여 설계에 적용할 수 있어야 한다. 본 논문에서는 트러스 구조물의 힘을 기본역학에서 예측되는 오차범위 이내로 실험법으로 측정할 수 있는 기구설계 방법을 제시하였다. 상용으로 제작된 재래식 변형률 측정 장치는 고가이고 복잡하므로 구조를 이해하기가 어려우므로 본 측정기구에서는 휘트스톤브리지 회로를 적용, 스트레인 게이지 및 A/D 변환기 조립하여 하중과 변형률을 쉽게 측정할 수 있도록 하였다. 제작된 기구를 이용하여 구조물에 하중을 가하여 변형률을 측정하였으며, 측정결과를 이론적으로 예측한 값과 비교하여 실용성을 입증하였다. 이 측정 기구는 저렴한 값으로 제작할 수 있으며, 크기가 작아 탁상에서 교육용 실험 및 실습 장비로 적합할 것으로 사료된다.