Transfer path analysis of ship vibration sources and experimental validation
CAO Yue-yun1,ZHANG Lei1,YANG Zi-chun1,HE Yuan-an2,GUO Wen-yong1
1. School of Naval Architecture and Power, Naval University of Engineering, WuHan 430033,China;2. Institute of Shipbuilding System Engineering Beijing 100036, China
摘要针对工况传递路径分析(Operational transfer Path Analysis OPA)方法在工程应用中虽具吸引力、尚存准确性难以满足船舶实际应用需求等问题,将多源信号视为卷积混叠,提出耦合振动噪声源分离方法。建立船舶OPA模型,结合船舶传递路径振声测试试验对模型可行性、正确性进行验证。讨论观测点数目及不同工况组合对新OPA模型影响,给出有效选取原则。结果表明,新OPA模型可准确、高效进行船舶噪声源识别、声场预报及状态监测,工程应用前景广阔。
The method of operational transfer path analysis(OPA) in engineering application is very attractive. In practical conditions of the ship, the coupled signals which cannot reflect the true vibration characteristics of the equipment can only be measured by the sensors. To deal with this problem, the signals of multi-vibration source were regarded as convolution aliasing. A separation method of coupled vibration source was proposed, then a OPA model of the ship was established. Combined with the test of vibration and acoustic radiation of the ship, the feasibility and correctness of the new model were validated. Two key factors including the number of observation points and the different combination of operating conditions which affected the accuracy of the OPA were were discussed, and the effective selection principles are given. The results indicate that the OPA method can effectively identify noise source of the ship, which is of great significance in guiding a real-time prediction of radiation noise and adopting appropriate measure to reduce structural vibration and radiated noise. Therefore the OPA method established in this paper has broad prospect of engineering application.