• 제목/요약/키워드: Over load test

검색결과 470건 처리시간 0.028초

유압 굴삭기의 전도율 표시장치의 개발 (Development of Displayer on Tipping-over rate for Hydraulic Excavator)

  • 임태형;최종환;김용석;이홍선;양순용
    • 한국공작기계학회:학술대회논문집
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    • 한국공작기계학회 2004년도 춘계학술대회 논문집
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    • pp.209-214
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    • 2004
  • This paper deals with tipping over of hydraulic excavator's crane work. If excavator lift too heavy weight, excavator tipped up. This is 38% of whole excavator accidents. In this paper, tipping over load which is maximum load of excavator can lift with displacement of excavator links, real load and tipping over rate are calculated with Zero Moment Point. We designed the tipping-over stability criterion algorithm considering the dynamic characteristics to which ZMP theory is applied and discussed the usefulness of the proposed algorithm compared with the moment equilibrium equation through the simulation and the actual test.

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가스 포일 스러스트 베어링의 하중지지 성능 및 구동 토크에 관한 실험적 연구 (Experimental Study on the Load Carrying Performance and Driving Torque of Gas Foil Thrust Bearings)

  • 김태호;이태원;박문성;박정민;김진성;정진희
    • Tribology and Lubricants
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    • 제31권4호
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    • pp.141-147
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    • 2015
  • Gas foil thrust bearings (GFTBs) have attractive advantages over rolling element bearings and oil film thrust bearings, such as oil-free operation, high speed stability, and high-temperature operation. However, GFTBs have lower load carrying capacity than the other two types of bearings owing to the inherent low gas viscosity. The load carrying capacity of GFTBs depends mainly on the compliance of the foil structure and the formed hydrodynamic wedge, where the gas pressure field is generated between the top foil and the thrust runner. The load carrying capacity of the GFTBs is very important for the suitable design of oil-free turbomachinery with high performance. The aim of the present study is to identify the characteristics of the load carrying performance of GFTBs. A new test rig for the experimental measurements is designed to provide static loads up to 800 N using a pneumatic cylinder. The maximum operating speed of the driving motor is 30,000 rpm. A series of experimental tests—lift-off test, static load performance test, and maximum load capacity test—estimate the performance of a six-pad GFTB, in terms of the static load, driving torque, and temperature. The maximum load capacity is determined by increasing the static load until the driving torque rises suddenly with a sharp peak. The test results show that the torque and temperature increase linearly with the static load. The estimated maximum load capacity per unit area is approximately 80.5 kPa at a rotor speed of 25,000 rpm. The test results can be used as a design guideline for GFTBs for realizing oil-free turbomachinery.

배전선로에 사용되는 전자개폐기(Magnetic Switch)의 가속수명시험에 관한 연구 (A Study on Accelerated Life Tests for Magnetic Switch Used in Distribution System)

  • 유행수;한규환;권영일
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2002년도 하계학술대회 논문집 A
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    • pp.536-540
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    • 2002
  • In this paper, accelerated life test (ALT) models and procedures for Magnetic Switch (MS) are developed and applied to assure specified reliability of the products at development phase and guarantee the life of the products. Magnetic contactor that functions with over-current relay is called MS. Magnetic contactor closes and opens the motor load with ON/OFF switch of electronic contactor. It is also used for protecting and controlling the load. Magnetic contactor detects the over-current flow in the load with a over-current relay and disconnects the load by opening its control power. In this study, ALT models for MS are developed using the relationship between stresses and life characteristics of products. Using the ALT models, we performed life tests and analyzed the tests results. The proposed ALT models and procedures may be extended and applied to testing similar kinds of products to reduce test times and costs of the tests remarkably. Finally the results of this study will contribute to improving reliability of products and strengthening competitiveness of our products in world markets.

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Development of an Efficient Notching Toolkit for Response Limiting Method

  • Shin, Jo Mun
    • 항공우주시스템공학회지
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    • 제15권4호
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    • pp.40-46
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    • 2021
  • At launch, satellites are exposed to various types of structural loads, such as quasi-static loads, sinusoidal vibrations, acoustic/random vibrations, and shocks. The launch environment test is aimed at verifying the structural stability of the test object against the launch environment. Various types of launch environments are simulated by simple vibration, acoustic, and shock tests considering possible test conditions in ground. However, the difference between the launch environment and the test environment is one of the causes of excessive testing. To prevent overtesting, a notching technique that adjusts the frequency range and the input load considering the design load is applied. For notching, specific procedures are established considering the satellite development concept, selected launch vehicle, higher system requirements, and test target level. In this study, the notching method, established procedure, and development of a notching toolkit for efficient testing are described.

에너지절감형 대형기계류부품용 수명시험장치의 개발 (Development of energy saving type life testing device for large machinery parts)

  • 이용범;신석신;박종호
    • 한국신뢰성학회지:신뢰성응용연구
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    • 제13권1호
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    • pp.55-63
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    • 2013
  • For a reliability assessment of large machinery parts, reliable data should be obtained from testing many samples for a long time. However, in case of testing these samples, testing cost is excessive; in case of life test for long time, power consumption is high; and in case of accelerated test by over load, very high cost is required to build the life testing device. Especially it is very frequent that the expensive device's life has ended during a accelerated test by over load. In this study, the design mechanism of the life testing device which excels in energy saving during the reliability test of large machinery parts has been introduced.

Improvement to Crack Retardation Models Using ″Interactive Zone Concept″

  • Lee, Ouk-Sub;Chen, Zhi-Wei
    • International Journal of Precision Engineering and Manufacturing
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    • 제3권4호
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    • pp.72-77
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    • 2002
  • The load interaction effect can be best illustrated by the phenomenon of overload retardation. Some prediction methods for retardation are reviewed and the problems discussed in the present paper. The so-called under-load effect much of the retardation disappears if a very low level minimum stress follows the overload, is also of importance for a prediction model to work properly under random load spectrum. The concept of Interactive Zone (IZ) fully considering reversed plasticity during unloading was discussed. This IZ concept can be combined with existing models to derive some improved models that can naturally take account of the under-load effect. Some simulations by IZ improved models for test under complex load sequences including multiple overloads and both over/under loads are compared with test results. It is seen that the improvement by IZ concept greatly enhanced the ability of existing models to accommodate complex load interaction effects.

원형 RC 기둥의 내진성능과 휨 초과강도 (Seismic Performance and Flexural Over-strength of Circular RC Column)

  • 고성현
    • 한국구조물진단유지관리공학회 논문집
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    • 제17권5호
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    • pp.49-58
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    • 2013
  • 축소모형 원형기둥 실험체 8개를 제작하여 일정한 축력 하에서 반복 횡하중을 가력하는 실험을 수행하였다. 실험체들은 형상비 4.5인 실험체로 설계되었다. 실험체의 주요변수는 횡방향철근비, 축방향철근비, 축방향철근 항복강도와 축력비이다. 기둥 실험체들의 실험결과들은 축방향철근비, 횡철근비와 축력비에 따라 등가점성비, 잔류변형, 유효강성등과 같은 내진성능이 다르게 나타났다. 낮은 항복강도의 축방향철근이 적용된 실험체는 등가점성감쇠비와 잔류변형과 같은 내진성능이 낮게 나타났다. 국내의 도로교설계기준에 휨 초과강도 규정이 2012년에 채택되었다. 실험결과들은 공칭강도, 비선형 모멘트-곡률 해석 결과, AASHTO LRFD 및 도로교설계기준 (한계상태설계법)과 같은 기준들과 비교하였다.

고온초전도변압기의 특성시험 (Test of an High Temperature Superconducting Power Transformer)

  • 이희준;차귀수;이지광;김우석;한송엽;류경우;최경달
    • 대한전기학회논문지:전기기기및에너지변환시스템부문B
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    • 제49권9호
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    • pp.572-577
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    • 2000
  • This paper describes the test results of a single phase 3kVA high temperature superconducting power transformer. The tapes are made with Bi-2223 and have silver alloy as the matrix. Four double pancake windings are used. Among them two double pancake windings are connected in series for high voltage winding and the others are connected in parallel for low voltage winding. The rated voltage and current of primary winding and secondary winding are 220/110V. 13.7/27.3A. Fundamental characteristics are obtained through short circuit and no load test. The over load capability and characteristics are investigated.

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건식 경량벽체의 내충격성 시험용 연질 충격체의 줄 길이에 따른 하중변동 특성 (Load Variation Characteristics about Rope Length of Large Soft Body of Lightweight Wall Impact Resistance test)

  • 김기준;송정현;안홍진;신윤호;지석원;최수경
    • 한국건축시공학회:학술대회논문집
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    • 한국건축시공학회 2014년도 추계 학술논문 발표대회
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    • pp.182-183
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    • 2014
  • In case of large soft body impact test at the construction site, the test conditions are different from conditions at the laboratory, and the length of rope to hold the impact specimen must be changed. In a previous study, the fact that the size of impact load is varied by the length of rope on the large soft body impact specimen was confirmed. In this study, the length of rope and fall height were set as independent variables to conduct the load analysis test. It was determined that the load fluctuation was occurred depending on the length of rope under the fall height over 100 mm, and it is concluded that the additional setup of fall height to modify the actual impact load size is required when the length of rope is below 2.5 m. In this study, the modified formula to put equal size of impact load regardless of the length of rope was extracted through the experiment.

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Changes in Mechanical Properties of Wood Due to 1 Year Outdoor Exposure

  • KIM, Gwang-Chul;KIM, Jun-Ho
    • Journal of the Korean Wood Science and Technology
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    • 제48권1호
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    • pp.12-21
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    • 2020
  • For quantitative evaluation of wooden structures, the mechanical performance of members has undergone outdoor exposure tests. A year-long monitoring was conducted using an SPF species. Test groups were divided into twelve (each month) to measure the moisture content, density and ultimate load. Starting from May when moisture content of the test group was at the lowest, simple failure modes were observed more frequently during the first half of the experiment, whereas complex failure modes took over during the second half. Starting from June when moisture content of the test group was the highest, ultimate load decreased by 30% in the second half compared to the first half. A multiple regression analysis confirmed that moisture content of the test group was the variable with most effect on ultimate load of various outdoor variables, and an estimation equation of a simple regression analysis revealed that moisture content and ultimate load formed an inversely proportionate relationship. It is thought that correlational relationships of variables other than moisture content could be applied with the increase in added data amount by longer periods of outdoor exposure tests.