本文關(guān)鍵詞：300噸級巡邏艇全頻段振動噪聲分析　出處：《大連理工大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 全頻段 混合算法 振動噪聲 噪聲控制 反饋控制

【摘要】：巡邏艇作為一種近海航行的小型艦艇,擔(dān)負(fù)著近海巡邏、警戒、探測、搜救等多種任務(wù),應(yīng)用廣泛。但由于此類艦艇振源的幅值大、頻譜廣,單一的確定性方法或統(tǒng)計性方法都不能有效的對其進行振動噪聲分析,使在整個頻段內(nèi)準(zhǔn)確預(yù)報其振動噪聲的難度增大。如何高效、精確的進行巡邏艇的全頻段內(nèi)振動噪聲預(yù)報就變成了一個值得研究的問題。 本文以300噸級巡邏艇實船為例,探討了復(fù)雜系統(tǒng)振動噪聲的全頻段分析方法,為結(jié)構(gòu)物的減振降噪奠定了基礎(chǔ)。在常規(guī)振動噪聲預(yù)報中,對結(jié)構(gòu)物低頻段采用有限元分析,對結(jié)構(gòu)物高頻段采用統(tǒng)計能量法分析。本文將中頻問題引入到船舶振動噪聲預(yù)報領(lǐng)域,根據(jù)預(yù)報對象的不同采用不同的頻段劃分依據(jù),并將FE-SEA混合算法應(yīng)用于復(fù)雜結(jié)構(gòu)物中頻段振動噪聲預(yù)報中,為全頻段內(nèi)結(jié)構(gòu)物振動噪聲預(yù)報提供了參考方法。根據(jù)噪聲預(yù)報結(jié)果探討了300噸級巡邏艇的艙室噪聲控制措施。 在完成300噸級巡邏艇全頻段振動噪聲預(yù)報之前,還做了下面兩方面的工作,一是以常見的框板結(jié)構(gòu)為例,探討了結(jié)構(gòu)物全頻段的振動預(yù)報方法,并驗證了FE-SEA混合算法在中頻段內(nèi)具有可靠性,為復(fù)雜結(jié)構(gòu)物全頻段振動噪聲分析提供了理論依據(jù)；二是運用FE-SEA混合算法,對框板結(jié)構(gòu)在中高頻段下的反饋控制進行了簡單的探討。 本文依據(jù)低中高頻分段建模分析思想,成功完成了對300噸級巡邏艇全頻段振動噪聲的預(yù)報。根據(jù)計算結(jié)果分析可知,在艙室噪聲預(yù)報中,SEA算法預(yù)報結(jié)果足以滿足實際應(yīng)用精度,FE-SEA混合算法在艙室噪聲預(yù)報中應(yīng)用有限；在艙室振動響應(yīng)預(yù)報中,從計算結(jié)果可以看出FE-SEA混合算法計算結(jié)果與FEA計算結(jié)果在重疊頻域內(nèi)符合良好,雖然在預(yù)報柔性組件時有稍許誤差,但仍處于可接受范圍之內(nèi)。這表明,FE-SEA混合算法在中頻段艙室振動響應(yīng)預(yù)報中具有實際應(yīng)用價值。從框板結(jié)構(gòu)反饋控制算例結(jié)果中可以看出,FE-SEA混合算法在中高頻段下的結(jié)構(gòu)動力響應(yīng)優(yōu)化中也是有效可行的。這表明FE-SEA混合算法是一種實用的、簡便的、有效的計算方法,具有廣泛應(yīng)用于船舶振動噪聲領(lǐng)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.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U661.44

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