【摘要】 以某航海教学实习船机舱为原型,建立机舱三舱段有限元模型,确定振动预报模型边界条件,选择发电柴油机组悬着位置作为力激励点,采用有限元/边界元法预测了机舱集控室和机修间声功率级,对比分析该两舷侧对称舱室场点声压级云图。计算各壁板对值班轮机员右耳位置声压的贡献度,验证以浮动地板为基础的浮动舱室设计可以有效降低舱室噪声。将此振动-声辐射耦合系统简化为箱形多腔结构,建立多腔结构及其单元腔室有限元模型,进行船舶机舱模型振动-声辐射实验,仿真结果与实验测量结果吻合较好,验证仿真方法的有效性。总结出船舶机舱舱段模型振声数值预报通用方法及流程,对指导船舶减振降噪有借鉴价值。更多还原

【Abstract】 With the engine room of certain training ship for navigation teaching being the prototype,the finite element model of three cabins is established and the boundary conditions of vibration forecasting model are set. The elastic mount installed positions on the diesel generator set are selected as the force excitation points. The finite element / boundary element method to predict sound power level of the machinery control room and mechanical workshops and sound pressure color nephogram of symmetrical field points on two sides is compared and analyzed,thus the degree of contribution of all bulkheads to the sound pressure in the right ear position of the duty engineer is acquired. And the floating cabins design based on floating floor is verified to effectively decrease the noise in cabin. the finite element model of multi-tanks structure and its unit chamber was built when the vibro-acoustic coupling system was simplified. And the vibro-acoustic radiation experiment of vessel engine room model was conducted. The simulation results are consistent well with the experimental results,which verify the validity of the simulation method. The method and process of predicting vibration and sound of the vessel engine room are summarized,which could be a reference for reducing vibration and noise of ships.更多还原