本文選題：船用低速柴油機(jī) + 扭轉(zhuǎn)振動(dòng)　； 參考：《大連海事大學(xué)》2015年碩士論文

【摘要】：船舶軸系扭轉(zhuǎn)振動(dòng)的研究已經(jīng)歷一個(gè)多世紀(jì),嚴(yán)重的扭轉(zhuǎn)振動(dòng)會(huì)造成曲軸、中間軸、螺旋槳軸斷裂,齒輪磨損,過(guò)大噪聲等危害,這些危害將影響船舶的安全航行。此外,隨著北極航道的逐漸開(kāi)通,冰區(qū)船舶的需求愈來(lái)愈大,船舶在冰層的沖擊下,螺旋槳與冰塊的相互作用使得推進(jìn)軸系的扭振狀態(tài)更加復(fù)雜,船舶推進(jìn)軸系系統(tǒng)面臨著更大的考驗(yàn)。因此,研究船用柴油機(jī)軸系扭轉(zhuǎn)振動(dòng)及其冰區(qū)特性對(duì)于冰區(qū)航運(yùn)乃至世界經(jīng)濟(jì)的發(fā)展具有非常重要的意義。本文對(duì)扭振計(jì)算理論進(jìn)行研究和整合,系統(tǒng)分析了影響扭振計(jì)算的各個(gè)因素并比較了多種扭振計(jì)算方法。同時(shí),基于MATLAB的GUI開(kāi)發(fā)平臺(tái),開(kāi)發(fā)了船舶軸系扭振計(jì)算軟件,并以6S70MC-C型柴油機(jī)為例進(jìn)行了實(shí)例計(jì)算驗(yàn)證。最后,對(duì)船舶軸系扭振的冰區(qū)加強(qiáng)理論進(jìn)行了深入的研究,并以6S70MC-C型柴油機(jī)為研究對(duì)象,結(jié)合所開(kāi)發(fā)扭振計(jì)算軟件,對(duì)船用低速柴油機(jī)的冰區(qū)扭振特性進(jìn)行了計(jì)算分析。本文涉及的主要工作內(nèi)容包括扭振當(dāng)量系統(tǒng)計(jì)算模型的建立,霍爾茨法、場(chǎng)矩陣法的自由扭振計(jì)算對(duì)比,簡(jiǎn)諧系數(shù)和阻尼計(jì)算方法的探討,扭振軟件編程,船用低速柴油機(jī)冰區(qū)扭振計(jì)算的研究等。通過(guò)計(jì)算和驗(yàn)證,認(rèn)為場(chǎng)矩陣法和動(dòng)力放大系數(shù)法具有較高的計(jì)算精度,且具有很好的可編程性；通過(guò)分析和對(duì)比現(xiàn)有資料,對(duì)四葉螺旋槳冰塊扭矩激勵(lì)的計(jì)算和設(shè)計(jì)冰塊扭矩隨轉(zhuǎn)速的變化關(guān)系提出了合理的建議和討論；最后采用穩(wěn)態(tài)頻域求解方式,針對(duì)四葉螺旋槳,通過(guò)對(duì)6S70MC-C型柴油機(jī)軸系扭振的冰區(qū)加強(qiáng)計(jì)算,結(jié)果表明90。單冰塊沖擊工況對(duì)軸系扭振狀態(tài)影響最大,在發(fā)生葉片次共振時(shí),中間軸和螺旋槳軸的扭振應(yīng)力大幅上升,軸系運(yùn)行狀態(tài)較危險(xiǎn)。
[Abstract]:The research on the torsional vibration of ship shafting has been going through more than a century. The severe torsional vibration will result in the breakage of crankshaft, intermediate shaft, propeller shaft, gear wear, excessive noise and so on, which will affect the safe navigation of ship. In addition, with the gradual opening of the Arctic waterway, the demand for ships in the ice area is increasing. Under the impact of ice, the interaction between propeller and ice makes the torsional vibration of propulsion shafting more complicated. The ship propulsion shafting system is facing a greater test. Therefore, it is of great significance to study the torsional vibration of marine diesel engine shafting and its ice zone characteristics for the development of shipping and the world economy. In this paper, the theory of torsional vibration calculation is studied and integrated. The factors affecting the calculation of torsional vibration are systematically analyzed and various methods of torsional vibration calculation are compared. At the same time, based on the GUI development platform of MATLAB, the torsional vibration calculation software of ship shafting is developed, and the example of 6S70MC-C diesel engine is given. Finally, the theory of ice zone strengthening of ship shafting torsional vibration is deeply studied, and the torsional vibration characteristics of marine low speed diesel engine are calculated and analyzed with the development of torsional vibration calculation software and taking 6S70MC-C diesel engine as the research object. The main work involved in this paper includes the establishment of calculating model of torsional equivalent system, Holtz method, comparison of free torsional vibration calculation of field matrix method, discussion of simple harmonic coefficient and damping calculation method, torsional vibration software programming, Research on calculation of torsional Vibration in Ice Zone of Marine low Speed Diesel engine. Through calculation and verification, it is concluded that the field matrix method and the dynamic magnification factor method have high accuracy and good programmability. The calculation and design of ice torque excitation of four-blade propeller with ice cubes are given. The relationship between ice torque and rotational speed is discussed. Finally, the steady state frequency domain solution is used for four-blade propeller. Through the calculation of torsional vibration of 6S70MC-C diesel engine shafting, the results show that 90. 9%. The single ice impact condition has the greatest influence on the torsional vibration state of shafting. When the blade sub-resonance occurs, the torsional vibration stress of intermediate shaft and propeller shaft increases significantly, and the running state of shaft system is more dangerous.
【學(xué)位授予單位】：大連海事大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：U664.21

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本文編號(hào)：1953068