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HILS를 적용한 소형 디젤 엔진용 디지털 가버너의 개발
이현섭(H. S. Lee),안창모(C. M. An),정창용(C. Y. Jung),전영흥(Y. H. Chun),최병근(B. K. Choi),정용길(Y. G. Jung) 한국동력기계공학회 2004 한국동력기계공학회 학술대회 논문집 Vol.- No.-
The purpose of this study is to design the intelligent speed control system for marine diesel engine by a HILS system Since sea state changes engine load instantaneously, the governing apparatus is essential for marine engine to maintain constant speed regardless of the load. As governing apparatus, mechanical, hydraulic and electrical governors have been employed. Most of speed controllers of a marine diesel engine developed are still using the PID control algorithm. But, the performance of a marine diesel engine depends highly on the parameter setting of the PID controllers. In this paper, therefore, a new method to tune efficiently the PID parameters by a HILS system is proposed. The proposed method shows quite a good control performance in comparison to the customary PID control method by the simulation using HILS for the various load change.
CAM 곡선 개선에 의한 차량용 공조기의 소음 저감 평가
정재은(Jeong, J.E.),정창용(Jung, C.Y.),서범준(Seo, B.J.),정운창(Jeong, U.C.),오재응(Oh, J.E.) 한국소음진동공학회 2011 한국소음진동공학회 논문집 Vol.21 No.9
The noise in a vehicle is an important factor for customers purchasing a car. Particularly, reduction of the noise that is generated from HVAC(heating, ventilation and air conditioning) is very important since it has considerable effects on interior noise. In general, identification of noise source is crucial to reduce noise level. The complex acoustic intensity method is widely used to obtain the accurate measurement and identification of noise source. Therefore, in the previous study, noise source of HVAC was identified through experimental approach using the complex acoustic intensity method. In this study, we are intended to confirm reduced level of noise by comparing the result between before and after modification of cam curve that is based on identified noise source of HVAC. It is found out that noise source of HVAC are motor and cam area using the complex acoustic intensity method in the previous study. We performed experiments to compare noise level between before and after modification of cam curve. Especially, it can be seen that complex acoustic intensity method using both active and reactive intensity is vital in devising a strategy for comparison to noise level. Also, the vector flow of acoustic intensity was investigated to identify sound intensity distributions and energy flow in the near field of HVAC.