300吨级巡逻艇全频段振动噪声分析

发布时间：2018-01-12 19:40

本文关键词：300吨级巡逻艇全频段振动噪声分析　出处：《大连理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：巡逻艇作为一种近海航行的小型舰艇,担负着近海巡逻、警戒、探测、搜救等多种任务,应用广泛。但由于此类舰艇振源的幅值大、频谱广,单一的确定性方法或统计性方法都不能有效的对其进行振动噪声分析,使在整个频段内准确预报其振动噪声的难度增大。如何高效、精确的进行巡逻艇的全频段内振动噪声预报就变成了一个值得研究的问题。本文以300吨级巡逻艇实船为例,探讨了复杂系统振动噪声的全频段分析方法,为结构物的减振降噪奠定了基础。在常规振动噪声预报中,对结构物低频段采用有限元分析,对结构物高频段采用统计能量法分析。本文将中频问题引入到船舶振动噪声预报领域,根据预报对象的不同采用不同的频段划分依据,并将FE-SEA混合算法应用于复杂结构物中频段振动噪声预报中,为全频段内结构物振动噪声预报提供了参考方法。根据噪声预报结果探讨了300吨级巡逻艇的舱室噪声控制措施。在完成300吨级巡逻艇全频段振动噪声预报之前,还做了下面两方面的工作,一是以常见的框板结构为例,探讨了结构物全频段的振动预报方法,并验证了FE-SEA混合算法在中频段内具有可靠性,为复杂结构物全频段振动噪声分析提供了理论依据；二是运用FE-SEA混合算法,对框板结构在中高频段下的反馈控制进行了简单的探讨。本文依据低中高频分段建模分析思想,成功完成了对300吨级巡逻艇全频段振动噪声的预报。根据计算结果分析可知,在舱室噪声预报中,SEA算法预报结果足以满足实际应用精度,FE-SEA混合算法在舱室噪声预报中应用有限；在舱室振动响应预报中,从计算结果可以看出FE-SEA混合算法计算结果与FEA计算结果在重叠频域内符合良好,虽然在预报柔性组件时有稍许误差,但仍处于可接受范围之内。这表明,FE-SEA混合算法在中频段舱室振动响应预报中具有实际应用价值。从框板结构反馈控制算例结果中可以看出,FE-SEA混合算法在中高频段下的结构动力响应优化中也是有效可行的。这表明FE-SEA混合算法是一种实用的、简便的、有效的计算方法,具有广泛应用于船舶振动噪声领域的前景。
[Abstract]:Patrol boat, as a small ship sailing offshore, is widely used in many tasks, such as offshore patrol, vigilance, detection, search and rescue, but because of the large amplitude of the vibration source of this kind of ship, it has a wide spectrum. The single deterministic method or statistical method can not effectively analyze the vibration and noise, which makes it more difficult to accurately predict the vibration and noise in the whole frequency band. Accurate prediction of the vibration and noise in the whole frequency band becomes a problem worth studying. In this paper, the full-band analysis method of complex system vibration and noise is discussed with the example of 300 dwt patrol boat, which lays a foundation for the vibration reduction and noise reduction of structure, and is used in the prediction of conventional vibration and noise. The finite element analysis is used for the low frequency band of the structure and the statistical energy method is used for the analysis of the high frequency band of the structure. In this paper, the intermediate frequency problem is introduced into the field of ship vibration and noise prediction. According to the different prediction objects, different frequency bands are divided, and the FE-SEA hybrid algorithm is applied to the prediction of vibration and noise in complex structures. This paper provides a reference method for the prediction of vibration and noise of structures in the whole frequency band and discusses the cabin noise control measures of 300 dwt patrol boats based on the results of noise prediction. Before completing the full-band vibration and noise prediction of 300-ton patrol boat, the following two aspects are also done. One is to discuss the vibration prediction method of the structure in the full frequency band by taking the common frame-plate structure as an example. The reliability of the FE-SEA hybrid algorithm in the middle frequency band is verified, which provides a theoretical basis for the analysis of the vibration and noise of complex structures in the full frequency band. Secondly, the feedback control of frame board structure in medium and high frequency band is discussed simply by using FE-SEA hybrid algorithm. Based on the idea of segmental modeling and analysis of low, middle and high frequency, this paper successfully completed the prediction of vibration and noise of 300 dwt patrol boat in full frequency band. According to the analysis of calculation results, it can be seen that the prediction of cabin noise is in the cabin. The prediction results of SEA algorithm are sufficient to meet the practical application accuracy of FE-SEA hybrid algorithm in cabin noise prediction. In the cabin vibration response prediction, it can be seen from the calculation results that the FE-SEA hybrid algorithm and the FEA calculation results are in good agreement in the overlapping frequency domain, although there is a slight error in the prediction of flexible components. But it is still within the acceptable range, which indicates that the FE-SEA hybrid algorithm has practical application value in the prediction of cabin vibration response in mid-frequency band, and it can be seen from the example of feedback control of frame-plate structure. The FE-SEA hybrid algorithm is also effective and feasible in the structural dynamic response optimization in the medium and high frequency band, which indicates that the FE-SEA hybrid algorithm is a practical, simple and effective calculation method. It is widely used in the field of ship vibration and noise.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U661.44

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