声固耦合数值模型在预报低频机械噪声时克服了传统流固声数值模型分步计算的不足。常用的声-振分析软件如Virtual.Lab的直接声振耦合统一求解算法不能直接施加设备的加速度激励，常采用大质量法将设备机脚的加速度激励转化为力激励。论文基于结构有限元/声学自动匹配层（FEM/AML）声固耦合方法，提出将激励直接施加到设备质心处的简化大质量法。机械噪声预报结果与传统大质量法、流固声方法结果进行对比，验证简化方法的有效性。基于声固耦合数值模型预报船舶机械噪声时，可采用简化的大质量法将加速度激励转化为力激励，并作为输入直接施加到设备质心处。
Acoustic-solid coupling numerical model overcomes the shortcomings of step-by-step calculation of traditional fluid-solid acoustic numerical model when predicting low-frequency mechanical noise. Commonly used acoustic-vibration analysis software such as Virtual.Lab's direct acoustic-vibration coupling unified solution algorithm cannot directly apply the device's acceleration excitation, and the large-mass method is often used to convert the device's foot acceleration excitation into force excitation. Based on the acoustic-structure coupling method of structural finite element / acoustic automatic matching layer (FEM/AML), this paper proposes a simplified large-mass method that applies excitation directly to the center of mass of the device. The prediction results of mechanical noise are compared with those of traditional large-mass method and fluid-solid sound method, which verifies the effectiveness of the simplified method. When predicting the ship's mechanical noise based on the acoustic-solid coupling numerical model, the simplified large-mass method can be used to convert acceleration excitation into force excitation and apply it directly to the center of mass of the device as an input.
2021,43(1): 32-36 收稿日期：2019-12-18
DOI：10.3404/j.issn.1672-7649.2021.01.006
分类号：TN911.7
基金项目：国家自然科学基金资助项目(51839005，51879113)
作者简介：刘晗(1995-),女,硕士,研究方向为振动与噪声控制
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