船用吊艙推進器結(jié)構(gòu)強度的研究
發(fā)布時間：2018-09-07 13:44
【摘要】：目前,國際造船界密切地關(guān)注著船舶能效設(shè)計指數(shù)(EEDI)標準的變化。船用推進器的設(shè)計需要更全面、更深入地考慮推進效率、空泡性能、船尾的脈沖壓力、振動噪音、強度。設(shè)計出滿足國際標準的新型船用推進器是迫在眉睫。國內(nèi)船用推進器水動力性能研究方法的不斷成熟,同時對特殊工況下推進器結(jié)構(gòu)強度的研究也正在進行。在船用推進器中,由于調(diào)距槳和吊艙推進器各自的特點,兩者都具有巨大的潛在市場。本文基于單向流固耦合理論的數(shù)值方法對調(diào)距槳槳葉和吊艙推進器吊艙進行結(jié)構(gòu)強度計算。具體的研究內(nèi)容如下:選擇散貨船的MAU4-54槳為研究對象,計算得到不同進速系數(shù)下的水動力性能,并與試驗結(jié)果進行比較,兩者比較吻合,同時對槳葉的壓力場進行具體分析。再提取設(shè)計工況下的槳葉壓力系數(shù)數(shù)據(jù),利用TECPLOT軟件將壓力系數(shù)插值到實槳有限元節(jié)點上,再通過相似定律計算得到實槳槳葉水動力載荷。最后利用ANSYS結(jié)構(gòu)靜力分析軟件對實槳水動力載荷、離心力載荷進行加載、求解和強度校核,并具體分析槳葉應(yīng)力、應(yīng)變,同時與CCS規(guī)范校核進行比較,兩者結(jié)果一致。此方法驗證基于單向流固耦合理論的槳葉結(jié)構(gòu)強度校核數(shù)值計算方法是合理的。與規(guī)范校核方法相比,此方法提供了更全面的應(yīng)力分布信息。用JDC3-65圖譜進行船-機-槳匹配設(shè)計,分別得出調(diào)距槳在設(shè)計工況、設(shè)計螺距下的系柱工況、最大推力工況三種情況下的幾何參數(shù)和轉(zhuǎn)速和水動力性能。再利用CFD數(shù)值方法分別對三種工況下的壓力分布進行計算和分析。再利用有限元法對三種工況下的槳葉強度進行計算和分析,同時與CCS規(guī)范校核進行比較,兩者結(jié)果一致。結(jié)果表明:在設(shè)計工況下滿足結(jié)構(gòu)強度要求,而在設(shè)計螺距下的系柱工況和最大推力工況下不滿足強度要求。利用基于單向流固耦合理論的數(shù)值計算方法校核吊艙。首先對不同進速系數(shù)和不同來流方向下的拖式吊艙推進器進行水動力性能數(shù)值計算,同時分析吊艙包表面的壓力分布。再用有限元法對這兩種工況進行強度計算,分析吊艙表面的應(yīng)力、應(yīng)變分布。結(jié)果表明:最大應(yīng)力發(fā)生在支架上端和前、后端;在吊艙小角度轉(zhuǎn)動時,吊艙推進器的應(yīng)力、應(yīng)變分布是相似的,大小沒有明顯變化。
[Abstract]:At present, the international shipbuilding industry is closely following the change of (EEDI) standard of ship energy efficiency design index. The design of marine propellers needs to be more comprehensive, more in-depth consideration of propulsion efficiency, cavitation performance, stern pulse pressure, vibration noise, intensity. It is urgent to design a new marine propeller that meets the international standards. At the same time, the research on the strength of propeller structure under special working conditions is also being carried out with the development of hydrodynamic performance research methods of marine propellers in China. In marine propeller, both of them have a huge potential market because of their respective characteristics of adjustable pitch propeller and podded propeller. Based on the unidirectional fluid-solid coupling theory, the structural strength of the adjustable pitch propeller blade and podded propeller pods is calculated. The specific research contents are as follows: the hydrodynamic performance of MAU4-54 propeller of bulk carrier is calculated and compared with the experimental results, and the pressure field of the blade is analyzed in detail. The pressure coefficient data of the blade under the design condition are extracted, and the pressure coefficient is interpolated to the finite element node of the real propeller by TECPLOT software, and the hydrodynamic load of the real propeller blade is calculated by the similarity law. Finally, ANSYS structural static analysis software is used to load, solve and check the strength of solid propeller hydrodynamic load and centrifugal force load. The stress and strain of blade are analyzed in detail, and the results are compared with those of CCS code. The results are in agreement with each other. This method verifies that the numerical calculation method of blade structure strength based on unidirectional fluid-solid coupling theory is reasonable. Compared with the standard checking method, this method provides more comprehensive information on stress distribution. The matching design of ship, engine and propeller is carried out by using JDC3-65 diagram. The geometric parameters, rotational speed and hydrodynamic performance of adjustable pitch propeller under design condition, mooring column condition under design pitch and maximum thrust condition are obtained respectively. Then the pressure distribution under three conditions is calculated and analyzed by CFD numerical method. The finite element method is used to calculate and analyze the blade strength under three working conditions, and the results are compared with the CCS code. The results are in good agreement with each other. The results show that the structural strength requirements are satisfied under the design condition, but not under the mooring column condition and the maximum thrust condition under the design pitch. A numerical method based on unidirectional fluid-solid coupling theory is used to check the pods. Firstly, the hydrodynamic performance of towed podded thrusters with different feed coefficients and different flow directions are calculated, and the pressure distribution on the surface of the pods is analyzed. The finite element method is used to calculate the strength of the two working conditions, and the stress and strain distribution on the surface of the pod is analyzed. The results show that the maximum stress occurs at the upper end, front end and back end of the support, and the stress and strain distribution of the podded propeller is similar when the pod is rotated at a small angle, but the magnitude does not change obviously.
【學(xué)位授予單位】：江蘇科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U664.3
本文編號：2228429
[Abstract]:At present, the international shipbuilding industry is closely following the change of (EEDI) standard of ship energy efficiency design index. The design of marine propellers needs to be more comprehensive, more in-depth consideration of propulsion efficiency, cavitation performance, stern pulse pressure, vibration noise, intensity. It is urgent to design a new marine propeller that meets the international standards. At the same time, the research on the strength of propeller structure under special working conditions is also being carried out with the development of hydrodynamic performance research methods of marine propellers in China. In marine propeller, both of them have a huge potential market because of their respective characteristics of adjustable pitch propeller and podded propeller. Based on the unidirectional fluid-solid coupling theory, the structural strength of the adjustable pitch propeller blade and podded propeller pods is calculated. The specific research contents are as follows: the hydrodynamic performance of MAU4-54 propeller of bulk carrier is calculated and compared with the experimental results, and the pressure field of the blade is analyzed in detail. The pressure coefficient data of the blade under the design condition are extracted, and the pressure coefficient is interpolated to the finite element node of the real propeller by TECPLOT software, and the hydrodynamic load of the real propeller blade is calculated by the similarity law. Finally, ANSYS structural static analysis software is used to load, solve and check the strength of solid propeller hydrodynamic load and centrifugal force load. The stress and strain of blade are analyzed in detail, and the results are compared with those of CCS code. The results are in agreement with each other. This method verifies that the numerical calculation method of blade structure strength based on unidirectional fluid-solid coupling theory is reasonable. Compared with the standard checking method, this method provides more comprehensive information on stress distribution. The matching design of ship, engine and propeller is carried out by using JDC3-65 diagram. The geometric parameters, rotational speed and hydrodynamic performance of adjustable pitch propeller under design condition, mooring column condition under design pitch and maximum thrust condition are obtained respectively. Then the pressure distribution under three conditions is calculated and analyzed by CFD numerical method. The finite element method is used to calculate and analyze the blade strength under three working conditions, and the results are compared with the CCS code. The results are in good agreement with each other. The results show that the structural strength requirements are satisfied under the design condition, but not under the mooring column condition and the maximum thrust condition under the design pitch. A numerical method based on unidirectional fluid-solid coupling theory is used to check the pods. Firstly, the hydrodynamic performance of towed podded thrusters with different feed coefficients and different flow directions are calculated, and the pressure distribution on the surface of the pods is analyzed. The finite element method is used to calculate the strength of the two working conditions, and the stress and strain distribution on the surface of the pod is analyzed. The results show that the maximum stress occurs at the upper end, front end and back end of the support, and the stress and strain distribution of the podded propeller is similar when the pod is rotated at a small angle, but the magnitude does not change obviously.
【學(xué)位授予單位】：江蘇科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U664.3
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