파력발전장치 성능시험을 위한 육상용 시험벤치의 개발

천호정(Hojeong Cheon),김재환(Jaehwan Kim),최종혁(Jonghyeok Choi) 한국해양환경·에너지학회 2022 한국해양환경공학회 학술대회논문집 Vol.2022 No.6

파력발전장치의 에너지 흡수부는 타 신재생에너지원과 다르게 에너지변동폭이 매우 크다. 이러한 에너지 흡수부를 모사하기 위해 다양한 시도가 계속되었지만, 표준화 되어 있는 시험방법은 존재하지 않는다. 이를 보완하기 위해 유압식 파워팩을 기반으로 하고, 회전식 베인펌프를 활용한 파랑에너지의 입사를 모사하기 위한 전용의 시험기를 개발하였다. 파랑에너지의 변동을 모사하기 위한 밸브블럭을 설계하였고, 유량제어밸브, 릴리프밸브를 이용해 입사되는 파랑에너지를 구현하였다. 규칙파, 불규칙파 파랑 입력에너지를 구현하기 위하여, 비례제어식 유량제어밸브를 도입하여 시험자가 요구하는 파고, 주기를 모사할 수 있게 개발하였다. 또한, 유압식 에너지변환장치에 직접 입력되는 유압에너지 뿐만 아니라, 1차에너지 흡수장치의 형태에 따라 유압파워팩을 거쳐 발생된 유압에너지를 RVM(회전식 베인 모터, Rotary Vane Motor)를 통해 회전 왕복운동하는 기계에너지 형태로 변환하여 에너지 형태를 모사할 수 있게 개발하였다. 본 연구를 통해 제작된 육상용 시험기는 실해역 시험이전에 파력발전장치의 성능을 확인하기 위해 사용될 계획이다. The energy absorbing part of the wave energy converter has a very large energy fluctuation range, unlike other renewable energy sources. Various attempts have been made to simulate this energy absorbing part, but there is no standardized test method. To supplement this, based on a hydraulic power pack, a dedicated tester was developed to simulate the incidence of wave energy using a RVP(Rotary Vane Pump). A valve block was designed to simulate fluctuations in wave energy, and incident wave energy was realized using flow control valves and relief valves. In order to realize regular and irregular wave input energy, a proportional control type flow control valve was introduced and developed to simulate the wave height and period required by the tester. In addition, not only the hydraulic energy directly input to the hydraulic energy converter, but also the hydraulic energy generated through the hydraulic power pack according to the type of the primary energy absorbing device is rotated and reciprocated through the RVM (Rotary Vane Motor). The onshore test bench manufactured through this study is planned to be used to check the performance of the wave energy converter before the actual sea test.

유압시스템 구성품 수명시험의 무고장 시험시간

이성래(Seong-Rae Lee),김형의(Hyoung-Eui Kim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11

It is very important for the manufacturers to predict the life of hydraulic system components according to the results of life tests. Since it takes too much time to test the hydraulic system components until failure, the no-failure test method is applied for the life test of them. If the shape parameter of Weibull distribution, the number of samples, the confidence level, and the assurance life are given, the no-failure test times of hydraulic system components can be calculated by given equations. Here, the procedures to obtain the no-failure test times of the hydraulic system components such as hydraulic motors and pumps, hydraulic cylinders, hydraulic valves, hydraulic accumulators, hydraulic hoses, and hydraulic filters are described briefly.

트랙터 유압기어펌프 내구시험 설계

최승준,김종근,이수윤,정동헌 대한기계학회 2024 大韓機械學會論文集A Vol.48 No.4

트랙터에 사용되어지는 유압기어펌프는 가혹한 환경에서 사용되어 신뢰성이 요구되어지나, 실제 필드에서는 다양한 고장사례가 발생하고 있다. 기어펌프의 고장사례 중 압력에 따른 내구성 저하 고장이 주로 발생하여, 본 연구에서는 압력 인자에 의한 내구시험을 토대로 가속시험을 설계하였다. 펌프 내구시험 설계를 위해, 현 트랙터에서의 사용시간을 바탕으로 무고장 시험시간을 도출하였고, 역승 모델을 통해 시험시간을 단축 가능한 가속시험을 설계하였다. 해당 시험법을 통해 국내외 업체별 기어펌프의 내구성을 비교 검토한 결과 필드 사용조건을 모사할 수 있는 가속시험 설계임을 확인하였다. Hydraulic gear pumps used in tractors face various failure cases in real field conditions, necessitating high reliability. Among these failures, the most significant issue is durability deterioration caused by pressure. Therefore, a study was conducted to design an accelerated durability test focused on the pressure factor. The pump durability test was designed based on the derived failure-free test time that was determined from the typical usage time of tractors. An accelerated test was developed using an inverse minor model, effectively reducing the testing time while maintaining test reliability. A comprehensive comparison and evaluation of gear pumps manufactured by both domestic and foreign companies using this test method confirmed that the designed accelerated test accurately simulated field use conditions.

유압 펌프 시험을 위한 성능 시험기 개발 및 평가

이광희(K. H. Lee),이철희(C. H. Lee) 유공압건설기계학회 2021 유공압건설기계학회 학술대회논문집 Vol.2021 No.11

소형 건설기계는 협소한 지역에서 작업을 수행할 수 있는 도심형 장비로의 장점이 있으나 환경 규제로 인해 구동시스템이 내연기관에서 모터로 변경되고 있고 이에 대한 개발 수요가 증대되고 있다. 배터리 기반의 모터 구동 동력 시스템의 경우에도 기존의 유압 펌프를 사용해야 하므로 엔진 동력 대신 모터를 직접 연결하여 사용하게 된다. 본 연구에서는 다양한 크기 및 구조의 유압 펌프에 대한 성능 시험을 위해 고속 모터 구동 기반 유압 펌프 시험기를 개발하고 펌프의 성능을 시험하는 것을 목표로 한다. 고속 및 고토크 조건에서 시험 진행이 가능하며 유압유의 온도를 일정하게 제어할 수 있는 시스템이 적용되었다. 또한, 작은 공간에서도 시험할 수 있게 소형화 시험 장치를 구성하였다. 추후, 본 시험기의 신뢰성을 확보하고 다양한 조건에서의 시험을 자동화할 수 있게 구현할 예정이다.

유압제어식 멀티셀 패더롤의 가속시험을 통한 성능평가 기법 연구

조경철(Kyung Chul Cho),이은하(Eun Ha Lee),박시우(Si Woo Park),김수연(Soo Youn Kim) 유공압건설기계학회 2018 드라이브·컨트롤 Vol.15 No.3

The hydraulic control valve, used in the CPB (cold-pad-Batch) cold dyeing system, passes through a pressurized material that absorbs the dye. The hydraulic control of the hydraulic control panel shall be driven in a uniform and precisely controlled manner, as it interferes directly with the dyschromatism. In this study, an acceleration test model was employed to verify the durability of the hydraulic control of the hydraulic control panel, which was manufactured by the scenic model, and the pre-roll angle was analyzed before the performance of acceleration test. Based on the change in the amount of deformation of the padder roll the durability of the padder roll was analyzed along with verification of the durability of the skin and the rubber coating in contact with the fabric. Furthermore, the accelerated test method used for hydraulic controlled multi-cell padder rolls was verified.

역부하 운용구간을 갖는 유압구동회로 설계

정재욱 한국기계기술학회 2015 한국기계기술학회지 Vol.17 No.2

In this paper, the design of hydraulic actuating circuit of doing over-running load was performed. Generally, the counter balance valve has been used to protect over-run or free falling of acuating system. But sometimes, it makes some undesirable problems such as pressure surge or vibration. To overcome such problems and satisfy the system requirements, we suggest the hydraulic circuit actuated by servo valve. In order to verify the properness of suggested hydraulic circuit, hydraulic actuator with servo valve was modeled using ADAMS/Hydraulic which is a commercial dynamic analysis software for multi-body system. Also, the effectiveness of hydraulic actuating circuit was verified via test bed and real plant.

유압시스템 구성품의 수명시험에 대한 고찰

이성래(Seong-Rae Lee),김형의(Hyoung-Eui Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11

It is very important for the manufacturers to predict the life of hydraulic system components according to the results of life tests. However, the time and cost of life tests are so much that it is almost impossible for the small or medium-size manufacturers to conduct the life tests themselves. Fortunately, the reliability center of Korea Institute of Machinery and Materials has been conducting the life tests of hydraulic system components such as hydraulic motors and pumps, hydraulic cylinders, hydraulic valves, hydraulic accumulators, hydraulic hoses, and hydraulic filters. Here, the assessment codes and test methods of life tests for the hydraulic system components are described briefly.

축압기의 최대토출유량 시험방법에 대한 연구

조민기(Min-Gi Cho) 유공압건설기계학회 2022 유공압건설기계학회 학술대회논문집 Vol.2022 No.12

This paper presents two test methods to check the maximum output flow rate, which is the basic specification of an accumulator, and deals with the pros and cons of each test by comparing the results. In the comprehensive performance test method of [RS B 0041: hydraulic bladder-type accumulator], which is a reliability evaluation standard, pressurize the accumulator with a hand pump, open the discharge valve, and measure the discharged flow rate. However, in this case, all work must be done manually, and as the capacity of the accumulator increases, it becomes difficult to work with a hand pump. Therefore, in this study, an accumulator and a flow meter are installed between the hydraulic pump and the relief valve to directly measure the discharged flow rate when the relief valve instantaneous pressure drops, and a cylinder is installed to measure the discharge flow rate through the displacement of the cylinder when the pressure drops. Indirect calculation method is presented. In addition, a circuit and a tester were configured according to each test method, and the test was conducted on the accumulator, and the results were compared. Through this, the pros and cons of each were confirmed, and a test method suitable for the test conditions and accumulator capacity was proposed.

KC-100 소형항공기 전기체 정적시험 하중부가장치

심재열(Jae-Yeul Shim),안석민(Seok-Min Ahn),최승호(Seung-Ho Choi) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11

Korea Aerospace Research Institute (KARI) is preparing Full-scale static & fatigue structure test for KC-100 small aircraft. Key subsystems of the testing system are test frame, loading system, counterbalance system, restraint (or positioning) system, etc.. It is planed for KARI to perform the static and fatigue test in serial. The static test will be performed first in March 2011. Design result on the the test frame, loading system at each component or subcomponent of test article is introduced and test conditions for the full-scale static test is introduced, and hydraulic cylinder and load cell selection for the test is also described in this paper.

노즐-플래퍼형 서보밸브의 정특성 시험에 관한 연구

손정훈(J.H. Son),신행봉(H.B. Shin),김상호(S.H. Kim),이현철(H.C. Lee) 유공압건설기계학회 2014 유공압건설기계학회 학술대회논문집 Vol.2014 No.4

This Paper presents test method and hydraulic test equipment for nozzle-flapper type servo valves. In addition, by implementing the test equipment by performing the test as mentioned in the test method for verifying the test would be performed by the test apparatus.