• Title/Summary/Keyword: Load Test System

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Design of an Automatic Test System for Electronic Equipments in Vehicles (승용차용 전장시험 자동화 시스템 설계)

  • 이창훈;김유남
    • Transactions of the Korean Society of Automotive Engineers
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    • v.9 no.1
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    • pp.131-138
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    • 2001
  • The performance analysis of an electronic equipment test is very complicate due to the variety o vehicles. In this study, automatic design system for the electronic equipment test has been carried out using the standard load patterns. For the test, standard signal patterns for each item are modeled. The test items can be decided by the user by means of these patterns. Also, engineering software modules are developed and proved to be very efficient for analyzing the test results statistically. Experiments are performed for the test system in the vehicle assembly line. By analyzing the test results, it is found that bad samples can be detected without failure. Also, the engineering software modules provide an analytical tool for the automation of the test process.

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A Development of the Recoil Rod Pull Force Measurement System Using the Load Cell with Sleeve (슬리브관을 갖는 로드셀을 이용한 주퇴봉 당김력 계측시스템 개발)

  • Choi, Ju-Ho;Hong, Sung-Soo;Lyou, Joon
    • Journal of Institute of Control, Robotics and Systems
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    • v.7 no.2
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    • pp.152-159
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    • 2001
  • This paper presents a development of the recoil rod pull force measurement system suing the load cell with a sleeve normally available in the recoil system test. The commercial load cell cannot be used in the test of recoil system floating the breach contact point freely in the air. The load cell is designed and manufactured to meet the recoil system test condition. Theoretical analysis and experimental results show that the accuracy of the developed measurement system is within $\pm$0.5%. We notice that the measurement technique proposed in this paper is accurate and useful in the recoil rod pull force measurement of the recoil system.

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Development of a Workload Index for Monitoring Durability Test of an Excavator (굴착기 내구시험 모니터링을 위한 작업부하 지표 개발)

  • Cho, Jae-Hong;Na, Seon-Jun;Kim, Min-Seok;Park, Myeong-Kwan
    • Journal of Drive and Control
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    • v.19 no.4
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    • pp.29-35
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    • 2022
  • In this paper, we developed a workload index for monitoring the durability test using operation information of an excavator. First, the acceleration and cylinder pressure were selected as load factors by analyzing operation data. Through load correlation analysis according to each load factor, Root Mean Square (RMS) and Work Load Range (WLR) were respectively derived as a load feature representing mechanical load. In addition, the workload index was used to quantify load features. For applying the workload index to monitoring, a real-time monitoring system consisting of sensors and embedded controller was installed on the excavator and the system was integrated with a remote monitoring environment using a wireless network. Results of load monitoring and analysis verified that the developed workload index was effective from the viewpoint of the relative comparison of the workload.

The Development of Structural Test Facility for the Strength Assessment of CFRP Marine Leisure Boat (탄소섬유강화플라스틱 재료 레저선박의 구조강도 평가를 위한 시험설비 구축과 운용에 관한 연구)

  • Jeong, Han Koo;Zhang, Yang;Yum, Deuk Joon
    • Journal of the Society of Naval Architects of Korea
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    • v.54 no.4
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    • pp.312-320
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    • 2017
  • This paper deals with the development of structural test facility for the strength assessment of marine leisure boat built from carbon fiber reinforced plastics (CFRP) materials. The structural test facility consists of test jig, load application and control system, and data acquisition system. Test jig, and load application and control system are designed to accommodate various size and short span to depth ratios of single skin, top-hat stiffened and sandwich constructions in plated structural format such as square and rectangular shapes. A lateral pressure load, typical and important applied load condition to the plates of the hull structure for marine leisure boat, is simulated by employing a number of hydraulic cylinders operated automatically and manually. To examine and operate the structural test facility, five carbon/epoxy based FRP square plates having the test section area of $1m^2$, which are part of CFRP marine leisure boat hull, are prepared and they are subjected to monotonically increasing lateral pressure loads. In the test preparation, considering the symmetry of the plates geometry, various strain gauges and linear variable displacement transformer are used in conjunction with data acquisition system utilizing LabVIEW. From the test observation, the responses of the CFRP hull structure of marine leisure boat are understood by obtaining load to deflection and strain to load curves.

Characteristics of Sub-cooled Nitrogen Cryogenic System for Applied High-Tc Superconducting Devices (고온초전도 응용기기용 과냉질소 냉각시스템의 냉각특성)

  • 강형구;김형진;배덕권;안민철;윤용수;장호명;고태국
    • Progress in Superconductivity and Cryogenics
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    • v.6 no.1
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    • pp.38-42
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    • 2004
  • The cryogenic system for 6.6 kV/200 A inductive superconducting fault current limiter (SFCL) was developed at Yonsei university in 2003. The sub-cooled nitrogen cryogenic system could be applied to not only SFCL but also many other applied high-Tc superconducting (HTS) devices like superconducting motor, superconducting generator and superconducting magnetic energy storage (SMES). Generally, the cooling capacity of GM-cryocooler depends on the load temperature. Therefore it is necessary to perform the cooling capacity test at no load condition to calculate the exact cooling power and heat load of cryogenic system. In this research, the cooling capacity test of GM-cryocooler was executed and the heat load of developed cryogenic system was calculated. The long run operation test results of sub-cooled nitrogen cryogenic system were successful in pressure and temperature condition. Moreover, the design and fabrication method of cryogenic system were introduced and the test results were described.

A Microcomputer-Based Data Acquisition/Control System for Engine Performance Test(II) -Construction and Evaluation of a Load Simulation System- (마이크로컴퓨터를 이용(利用)한 엔진 성능시험(性能試験)의 자동화(自動化)에 관한 연구(硏究)(II) -모의(模擬) 부하시험(負荷試験) 시스템의 구성(構成) 및 평가(評價)-)

  • Ryu, K.H.;Bae, Y.H.;Yoon, K.J.
    • Journal of Biosystems Engineering
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    • v.14 no.1
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    • pp.1-7
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    • 1989
  • This study was carried out to develop a system and methodology to simulate the engine load variation occuring during agricultural field operations for a laboratory engine test. The system consisted of an electric dynamometer, an Apple II microcomputer, and a data acquisition and control system. Several pieces of instruments were utilized to measure various engine performance data. Both engine torque and engine speed were fully controlled by a computer program. The dynamic characteristics of the system were analyzed through a series of tests and the limitations on the load simulation test were presented. The results of the study are summarized as follows: 1. Engine speed and toque were controlled by a computer program. The use of a stepping motor and reduction gears enabled engine speed be controlled within 1 rpm. 2. The natural frequency of the dynamometer-engine system was found to be around 5 Hz, at which the load simulation would be impossible because of resonance. 3. For the harmonic inputs with the frequencies above the natural frequency, the signal attenuated too much and therefore the load simulation was impossible. 4. The step response of the system showed an overshoot of 24.5 percent and the settling time for 5 percent criterion was around 3 seconds. 5. When actual field test data are utilized for load simulation, a low-pass filter should be included to attenuate the frequency components around and above the natural frequency.

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Modeling and verification of generator/control system of Seo-Inchon combined-cycle plant by load rejection test (부하차단시험에 의한 서인천복합화력 발전기.제어계의 모델링 및 검증)

  • 최경선;문영환;김동준;추진부;류승헌;권태원
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.45 no.4
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    • pp.501-510
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    • 1996
  • The gas-turbine generator of Seo-Incheon combined-cycle plant was tested for derivation of a model for dynamic analysis. Load rejection and AVR step test was performed to get the dynamic response of generator. The parameters of generator/control system model were determined by these measured data. No-load saturation test was performed for the saturation characteristics of the generator under steady state. V-curve test was also performed so as to find exact generator parameters. Q-axis parameters of generator was derived by measuring power angle. AVR and governor constants have been tuned by their oscillatory period and setting time characteristics. The derived parameters of generator control system is verified by one-machine infinite bus system simulation. (author). 7 refs., 20 figs., 5 tabs.

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A Study on Structural Integrity and Dynamic Characteristic of Inertial Load Test Equipment for Performance Test of Railway Vehicle Propulsion Control System (철도차량 추진제어장치 성능시험을 위한 관성부하 시험설비의 구조안전성 및 동특성 평가 연구)

  • Jang, Hyung-Jin;Shin, Kwang-Bok;Lee, Sang-Hoon;Lee, Dae-Bong
    • Journal of the Korean Society for Railway
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    • v.13 no.4
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    • pp.363-370
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    • 2010
  • This paper describes the evaluation of structural integrity and dynamic characteristic of inertial load test equipments for performance test of railway vehicle propulsion control system. The propulsion control system of railway vehicle has to be confirmed of safety and reliability prior to its application. Therefore, inertial load test equipments were designed through theoretical equation for performance test of propulsion control system. The structural analysis of inertial load test equipments was conducted using Ansys v11.0 and the dynamic characteristic was evaluated using Adams. The results showed that the structural integrity of inertial load test equipment was satisfied with a safety factor of 10.2 on the bearing part under combined load. Also, the structural stability of flywheel according to dynamic simulation was secured by the maximum oscillation displacement within 0.83mm.

Measurement and Analysis of Voltage Drop in Traction Power Supply System (전기철도 급전시스템의 안정화를 위한 전압강하 측정 결과 분석)

  • Kim, Joo-Rak;Lee, Young-Heum
    • Proceedings of the KIEE Conference
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    • 2011.07a
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    • pp.2210-2211
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    • 2011
  • Load capacity varies according to a day of the week in traction power supply system, because time schedule in railway is changed as demand for passengers and freights. Therefore, Voltage drop also varies as load capacity. In Korea railway, Voltage collected from catenary in train is decreased, as load supplied traction power supply system is increased. Therefore, investigation about voltage drop should be performed, before development of countermeasure against voltage drop. The investigation can be performed by simulation or field test. Naturally, field test is more precise than simulation. In addition, field test should be carried out at peak load. This paper presents test and analysis about voltage drop in railway. The test is performed in both a day of the week and weekend. The analysis is figured out comparison load capacity between two days and voltage drop across terminal.

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A Study on Analysis of Load Test Result of Bogie Frame for New Electrical Multiple Unit (신형전동차 대차프레임 하중시험결과 분석 연구)

  • Kim Won-kyung;Yoon Sung-Cheol;Jun Chang-Sung
    • Proceedings of the KSR Conference
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    • 2005.11a
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    • pp.1056-1062
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    • 2005
  • This paper describes the results of structure analysis and load test of a bogie frame. The purpose of the test is to evaluate the safety and functionality of the bogie frame under maximum load. The bogie system consist of the bogie frame, suspensions, whee/sets, a brake system and a transmission system. Of these components, the bogie frame is the major component subjected to the vehicle and passenger loads. The evaluation method used the JIS E 4207 specifications throughout static load test. The test results have shown the bogie frame to be safe under design load conditions.

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