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RISS 인기검색어
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- 저자 : 송하권(Ha-Kwun Song) (검색결과 2 건)
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송하권(Ha-Gwon Song),이용권(Yong-Kwun Lee),임동원(Dong-Won Lim) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
In machinery, the incipient fault detection is of importance to avoid any fatal breakdown of operations. Typically, a mechanical part gradually degrades, and then its degradation accelerates as time goes. The EHA (Electro-Hydraulic Actuator) is a linear actuator which merits include its high weight-to-power ratio. The water-based EHA, which does not contaminate surrounding environment due to the leakage, employs the plastic pump, because the operating fluid is water. The plastic pump requires automatic fault detection due to its low strength of the material. In this research, the early fault detection methodology of the plastic pump is proposed based on the hardware redundancy. The residual from pressure measurements is generated, and approximately 0.005 MPa was observed. To declare the fault, the accumulated residual is used because 0.005 MPa is less than the noise level. With 1 MPa threshold, the fault could be declared using the accumulated residual which becomes greater than 1 MPa after 10 seconds of its operation.
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수압 EHA 사판식 액셜 피스톤 펌프 역치법 고장탐지 알고리즘
송하권(Ha-Kwun Song),임동원(Dong-Won Lim) 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.11
Early fault detection holds paramount significance in preventing catastrophic operational breakdowns. Ordinarily, mechanical components undergo a gradual degradation process, often accelerating over time. The implementation of a water-based Electro-Hydraulic Actuator (EHA), which eliminates environment contamination concerns due to leakage, relies on a plastic pump mechanism. This choice arises from the use of water as the operating fluid. However, owing to the comparatively lower material strength of plastic, the automatic detection of potential faults becomes imperative for the plastic pump. To ensure system integrity, the thresholding fault detection method was proposed based on the pressure residual integral value of the power cylinder. In this study, the thresholding for the pump fault detection was dealt mathematically. Experimental verification demonstrated that the proposed method effectively distinguished between a healthy device and a faulty pump. By comparing the pressure residual integral values, faults could be declared if the value exceeded a specified threshold. The proposed method allowed for initial fault detection within 10 seconds of pump operation, providing the opportunity to prevent abrupt system shutdowns.
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