http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
오늘 본 자료
능동 진동 제어 시스템 성능 및 신뢰성 개발을 위한 6축 시뮬레이터 구축
김정훈(Jeong-Hoon Kim),김재산(Jae-San Kim),심재호(Jae-Ho Shim),박태익(Tae-Ik Park) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Recently, the interest in technologies for a highly efficient powertrain, i.e. a variable displacement engine or a light weight car body, to improve the fuel efficiency of automobile saving the environment has been increased. However this trend deteriorates NVH performance of a vehicle and the use of a conventional engine mounting system becomes unsatisfactory. In order to solve this dilemma, an active engine mounting system that could isolate or cancel out vibrations occurred at the powertrain was suggested. Not only an actuator with electronically controlled unit but also a successful control algorithm is essential for the development of the active engine mounting system. In many cases, the development of a control algorithm involves many trial and errors and the test with a real vehicle has its own inherent difficulties and risks. In order to minimize the research time and effort considerably, the development of a practical simulator may be necessary consequence. In this paper, the performance test and the reliability verification of an active engine mounting system with a control algorithm are examined with a newly developed 6-DOF simulator. The simulator is in the form of Hexapod Stewart Platform, where newly developed LEMA (Linear Electro-Magnetic Actuator) are applied as driving actuators. Effectiveness of the simulator is verified by using an active engine mounting system in the form of active linear vibration absorber. Firstly, we measured the target signal such as vibrations and RLD of an aimed vehicle at the proving ground. Then, the target signal is compared with the reproduced signal to examine reproducibility of 6-DOF simulator. Finally the controlled signal level at an aimed vehicle with an active engine mounting system is then compared with the level at 6-DOF simulator. Based on the two tests results, it is concluded that the adoption of 6-DOF simulator for the development of an active engine mounting system is very practical.
능동형 엔진 마운팅 시스템 성능 평가를 위한 6축 시뮬레이터 구축
김정훈(Jeong-Hoon Kim),김재산(Jae-San Kim),이한동(Handong-Lee),박태익(Tae-Ik Park) 한국소음진동공학회 2011 한국소음진동공학회 학술대회논문집 Vol.2011 No.4
As worldwide concern stands on global warming and greenhouse gases from internal combustion engine, the interests in technologies for a highly efficient powertrain has been increased. Concurrently the investigation to improve the deteriorated NVH, a by-product of energy efficient powertrain, is conducted seriously. The NVH performance of a new type of active engine mount that offers increased advantages over a passive hydraulic mount is examined using a newly developed 6-DOF simulator. The simulator is in the shape of Hexapod Stewart Platform adopting LEMA, a new type of actuator which is patented and commercialized by ACT Inc,, the world wide leader in the design, development, and manufacture of high performance linear electro-magnetic actuators for active vibration control. The target vibration signals of an aimed vehicle at four engine mounts are measured and simulated by 6-DOF simulator at the laboratory. The resulting NVH performances of the new active mounting system at a vehicle and on a simulator are examined and compared. Even though the active mount performance of lab test demonstrates less effective than the result of a real vehicle test, vibration reduction is identified through the simulator.
6축 시뮬레이터를 활용한 능동형 엔진 마운팅 시스템 개발
김정훈(Jeong-Hoon Kim),김재산(Jae-San Kim),심재호(Jae-Ho Shim),박태익(Tae-Ik Park) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
The NVH performance of a new type of active engine mount that offers increased advantages over a existing mount is examined using newly developed 6-DOF simulators. One is for the Active dynamic damper the other is for the pneumatic active mount. The target vibration signals from several parts of engine and subframe are measured and then regenerated those on the simulators. Active vibration control logic is verified and optimal logic is selected by using simulator. The performance of pneumatic active mount is measured in each control conditions and optimal control condition is selected by using simulator.
양승윤,김정훈,김경섭,김재산,박귀호,김기원,이상호,Yang Seung-Yun,Kim Jeong-Hoon,Kim Kyung-Sub,Kim Jae-San,Park Kwi-Ho,Kim Gee-Won,Lee Sang-Ho 한국군사과학기술학회 2005 한국군사과학기술학회지 Vol.8 No.1
In this study, Experimental analysis on submarine cable tension was performed for the safe and efficient laying and recovery of a submarine cable. The tension analysis was done through the analyzed data using the cable dynamic theory and the measured data using the experiment. The analyzed cable tension was able to decide requirements for the purpose of laying and recovery of the submarine cable. As the result of tension analysis for a Submarine cable, it was shown a proper feasibility to determine the laying and recovery conditions of the submarine cable.
최적화 기법을 이용한 단조로 제작된 타이 로드 물성 도출
진성완(Sungwan Jin),신인섭(Inseob Shin),고수곤(Soogon Koh),김용갑(Yong Kap Kim),김재산(Jae-San Kim) 한국자동차공학회 2017 한국자동차공학회 학술대회 및 전시회 Vol.2017 No.11
Recently test-based correlation of CAE (computer aided engineering) analysis is required in various industries including automotive department, and the research has progressed on CAE analysis modeling, material properties and boundary conditions. In this paper, we derive material properties, Young’s modulus, yield strength and tensile strength, of steering component of forging tie rod assembly, inner tie rod and outer tie rod, for CAE analysis using optimization method. We formulated a design problem to minimize the error between 1st natural frequency of modal test, buckling strength of buckling test, and CAE analysis results using gradient-based algorithm, SQP (sequential quadratic programming) optimization method sequentially. The derived material properties of forging tie rod components reveal that the error between modal test, buckling test, and CAE analysis results has reduced.
모달 파라미터 정보를 활용한 PCB 물성 예측에 관한 연구
추정환(Jeong Hwan Choo),정현범(Hyun Bum Jung),홍상렬(Sang Ryel Hong),김용갑(Yong Kap Kim),김재산(Jae San Kim) 대한기계학회 2017 大韓機械學會論文集A Vol.41 No.5
본 연구에서는 횡등방성 특성을 갖는 인쇄회로기판(PCB)의 물성 예측을 위한 방법을 제안하였다. 등방성 소재와 달리 횡등방성 소재의 물성 취득을 위한 별도의 시험기준은 없으며, PCB와 같이 적층된 형태의 박판 구조물에 대해서는 재료시험 또한 쉽지가 않다. 모달시험을 통해 취득한 모달 파라미터와 상용 소프트웨어인 OptiStruct<SUP>®</SUP>의 치수 최적화 기법을 활용, 시험-해석 간 주파수 차이를 최소화시키는 강성행렬 성분을 도출하여 기계적 물성을 예측하였다. 또한 주파수 별 모드형상을 MAC(Modal Assurance Criteria) 값을 기준으로 비교, 검토하여 예측 물성에 대한 유효성을 확인하였다. 제안된 방법은 향후 PCB를 포함하는 전장제품의 설계검증을 위한 구조해석에 확대 적용될 것으로 기대한다. In this study, we propose a method for predicting the mechanical properties of the printed circuit board (PCB) that has transversely isotropic characteristics. Unlike the isotropic material, there is no specific test standard for acquisition of the transversely isotropic properties. In addition, common material test methods are not readily applicable to that type of laminated thin plate. Utilizing the natural frequency obtained by a modal test and the sizing optimization technique provided in OptiStruct<SUP>®</SUP>, the mechanical properties of a PCB were derived to minimize the difference between test and analysis results. In addition, the validity of the predicted mechanical properties was confirmed by the MAC (Modal Assurance Criteria) value of each of the compared mode shapes. This proposed approach is expected to be extended to the structural analysis for the design verification of the top product that includes a PCB.