The Optimization Design Of Noise And Vibration In Large Marine Propulsion Asynchronous Motor

With the rapid growth of domestic economy and the ocean industry development, the traditional concept of the ship has not only stay on the transportation. People began to pay attention to the ship’s stability, low noise, and the comfortable. The department of the Navy also began to focus on the stealth performance that could be influenced by the noise of the large mechanical components. In the core parts of these ships, large Marine propulsion motor as the power supplier of the ship, will pay more attention to the vibration and noise influence on it. As the big-power marine propulsion motor had been designed earlier in the developed countries, the domestic market monopolized by foreign companies for a long time. At present our country desperately need to develop our own large marine propulsion motor which has high reliability, low vibration and noise.This thesis relies on the project that the certain domestic ship will assemble a 5 MW level propulsion asynchronous motor. The size of the H900 motor in the prophase scheme is much bigger than the cabin required size. The new design is a H800 motor. According to the domestic and international standards of vibration and noise in marine motor and the marine market demands, the motor sets a goal that the vibration velocity value is not greater than 1.5mm/s and the noise value is not greater than 102 d B in factory test. The goal will be one level higher than the GB/T7060 required. In the area of electromagnetic, calculate the electromagnetic wave to avoid electromagnetic vibration and noise which caused by the radial force wave. To keep away from the resonance, calculate the natural frequency by the finite element analysis. For the marine environment characteristics, the marine bearing will be designed. In the area of mechanical, the deflection and critical speed will be calculated. Based on the stator modal test, vibration spectrum measurement test, the early theoretical modal analysis is verified by the test data. The analysis of measurement results and the motor factory test data, proved the correctness of the optimization design in this thesis, as well as to the feasibility of the design basis.