基于模态试验的舰船振动噪声预报研究

以某舰船模型为对象,利用双通道频谱分析仪,采用宽频带的快速正弦扫描激励方法,对上述船模进行模态试验分析,同时利用模态分析软件的参数识别功能,结合三维数据转换程序,识别出该船模的各阶固有频率,振型以及阻尼参数,并以图表、曲线等形式给出相应的结果。通过试验研究与振动特性分析,得到了一些有价值的结论。在此基础上,运用模态试验确定该舰船模型的水下声辐射效率,从而对舰船的水下噪声预报进行了尝试。

Vibration and Noise Forecasting of Warship Based on Modal Experiment

With a warship model as the research object,the modal analysis is proceeded by using the fast sinusoidal scanning method with the FFT analyzer.The vibration modes,the natural frequencies and the damping coefficients are recognized by means of the identification software of the modal parameters.The three-dimensional transfer function data are also obtained in the form of chart,curve and so on.A series of valuable results are derived through the experimental study and the analysis of the vibration characteristics.Simultaneously,the noise radiation efficiency of the hull structure is determined through the modal experiment and the calculation.Then the noise forecasting of the warship is proceeded.