능동 진동 제어 시스템 성능 및 신뢰성 개발을 위한 6축 시뮬레이터 구축

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.