유압동력 발생장치의 소음특성 개선을 위한 실험적 연구

Abstract

Abstract: Nowadays, the hydraulic power unit (HPU) has been increased its working pressure and enlarged its capacity in order to improve the performance of the hydraulic system, but it produces noise leveled around 110dB(A) during operation. Recently, due to the reinforcement of industrial safety regulations and the require-ment of improving work environment, a separated HPU room is installed at outside or underground of the building as to reduce the noise from HPU, but there are also problems of power loss owing its fluid friction of pipe system and of deficient accessibility during its failure accident. In this study, experiment is performed to improve the noise characteristics with installing a soundproof chamber to minimize the power loss and ex-clude effectively the high leveled noise, which is generated during the power conversion of HPU. Key Words: hydraulic power unit, noise characteristic, shield chamber, hydraulic pump, hydraulic oil 1. 서론 유압동력발생장치(HPU)는 엔진이나 전동기로 유압펌프를 구동시켜 유압동력(P*Q)을 발생시켜 액추에이터(actuator)에 공급하는 것이다. 최근에는 유압시스템의 출력밀도(kW/kg)를 높이기 위하여 고압 화와 대형화하는 추세이므로, 유압펌프에서 발생하는 높은 소음이 산업안전강화와 작업장환경개선 요구 등으로 인하여 문제가 되고 있어서 HPU의 저소음화 연구가 절실한 현상이다