The load criteria for ship mechanical noise prediction in low frequencies and experimental validation

IF 13 1区 工程技术 Q1 ENGINEERING, MARINE Journal of Ocean Engineering and Science Pub Date : 2023-06-01 DOI:10.1016/j.joes.2022.01.005
Xi-An Liu, De-Qing Yang, Qing Li
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Abstract

The loading method of the external excitations generated by the equipment directly affects the predicted result of the mechanical noise which should be the same under different excitation forms for the given equipment. In this paper, general load criteria are proposed to define forces/moments as the standard form and convert other forms of loads in the low-frequency domain. As the most typical form to characterize equipment excitation, acceleration load loading methods for different conditions are investigated. The equivalent formula between ideal accelerations and generalized forces establishes the first load criterion. The second load criterion is proposed to address the issue of an average acceleration loading, in which the phase and amplitude distribution are both absent, and cannot apply to the load identification. The upper and lower limits of the mechanical noise can be determined by the vibroacoustic transfer function of the three load models, and the energy-averaged value is used to represent the mechanical noise. Furthermore, the third criterion is used to handle the case where the acceleration load is given by the results of a bench test. According to the equipment source descriptor invariance, the conversion method is achieved between the bench test and the real ship based on the transfer function of a load model, and the mechanical noise is predicted by an equivalent energy method. Finally, a three-parameter method to quantitatively evaluate the well-fitting of experimental and numerical results, and the load criteria are well validated by underwater acoustic experiments of an experimental model.

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低频船舶机械噪声预测的载荷准则及实验验证
设备产生的外部激励的加载方式直接影响到机械噪声的预测结果,对于给定的设备,在不同的激励形式下,机械噪声的预测结果应该是相同的。本文提出了通用荷载准则,将力/弯矩定义为标准形式,并在低频域中转换其他形式的荷载。作为表征设备励磁的最典型形式,研究了不同工况下的加速度加载方法。建立了理想加速度与广义力的等效公式,建立了第一载荷准则。针对平均加速度载荷中相位和幅值分布均不存在,无法用于载荷识别的问题,提出了第二种载荷准则。机械噪声的上下限可由三种荷载模型的振声传递函数确定,并用能量平均值表示机械噪声。此外,第三个准则用于处理加速度载荷由台架试验结果给出的情况。根据设备源描述符的不变性,基于载荷模型的传递函数实现台架试验与实船之间的转换方法,并采用等效能量法预测机械噪声。最后,采用三参数法定量评价试验结果与数值结果的拟合性,并通过实验模型的水声实验对荷载准则进行了验证。
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来源期刊
CiteScore
11.50
自引率
19.70%
发文量
224
审稿时长
29 days
期刊介绍: The Journal of Ocean Engineering and Science (JOES) serves as a platform for disseminating original research and advancements in the realm of ocean engineering and science. JOES encourages the submission of papers covering various aspects of ocean engineering and science.
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