Shu C.,Wuhan University of Technology |
Yang J.-G.,Wuhan University of Technology |
Yang J.-G.,Key Laboratory of Marine Power Engineering and Technology of Ministry of Communication |
Wang Q.-P.,Wuhan University of Technology
Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology | Year: 2011
On the base of WECS (Wärtsilä Electronic Control System) and the propulsion control system of a RT-Flex60C large intelligent low-speed diesel engine, using "cylinder moving method" to generate the sinmulation signals for exhaust valve lift, with the independently developed real-time simulation unit and signal acquiring unit, a HIL (Hardware In the Loop) simulation test platform of the electrically controlled exhaust valves for large intelligent diesel engine is built. The signals of a servo oil press, a exhaust valve lift, a exhaust valve open control, exhaust valve close controls and a air spring pressure can be acquired on the simulation test platform. The experimental results indicate that the performance of the platform is stable and reliable, which truly reflects the diesel engine working process and the characteristic of VEO (Variable Exhaust Opening) and VEC (Variable Exhaust Closing) on-line with the real diesel engine. The platform provides the good conditions for the electrically controlled exhaust valves characteristic analysis, the actuator performance verification, the control system testing for the large intelligent low-speed diesel engine.
Xia X.-B.,Wuhan University of Technology |
Xia X.-B.,Key Laboratory of Marine Power Engineering and Technology of Ministry of Communication |
Xiang Y.,Wuhan University of Technology |
Xiang Y.,Key Laboratory of Marine Power Engineering and Technology of Ministry of Communication |
And 2 more authors.
Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology | Year: 2014
Structure acoustic shape optimization was implemented using genetic algorithm based on the finite element method and wave superposition method. By using the finite element method, the vibration response was analyzed and the radiation sound power was calculated by the wave superposition method. In order to solve the problem of building the structure parameter model, the structure surface was restructured with a series of mode shape superposition. By using the genetic algorithm, the weight factor of each mode shape was optimized to get the best surface shape with minimum radiation sound power response. A numerical example was demonstrated to verify the efficiency and accuracy of the method.