船用低速柴油机轴系扭振及其冰区特性的研究

发布时间：2018-05-30 00:17

本文选题：船用低速柴油机 + 扭转振动　；参考：《大连海事大学》2015年硕士论文

【摘要】：船舶轴系扭转振动的研究已经历一个多世纪,严重的扭转振动会造成曲轴、中间轴、螺旋桨轴断裂,齿轮磨损,过大噪声等危害,这些危害将影响船舶的安全航行。此外,随着北极航道的逐渐开通,冰区船舶的需求愈来愈大,船舶在冰层的冲击下,螺旋桨与冰块的相互作用使得推进轴系的扭振状态更加复杂,船舶推进轴系系统面临着更大的考验。因此,研究船用柴油机轴系扭转振动及其冰区特性对于冰区航运乃至世界经济的发展具有非常重要的意义。本文对扭振计算理论进行研究和整合,系统分析了影响扭振计算的各个因素并比较了多种扭振计算方法。同时,基于MATLAB的GUI开发平台,开发了船舶轴系扭振计算软件,并以6S70MC-C型柴油机为例进行了实例计算验证。最后,对船舶轴系扭振的冰区加强理论进行了深入的研究,并以6S70MC-C型柴油机为研究对象,结合所开发扭振计算软件,对船用低速柴油机的冰区扭振特性进行了计算分析。本文涉及的主要工作内容包括扭振当量系统计算模型的建立,霍尔茨法、场矩阵法的自由扭振计算对比,简谐系数和阻尼计算方法的探讨,扭振软件编程,船用低速柴油机冰区扭振计算的研究等。通过计算和验证,认为场矩阵法和动力放大系数法具有较高的计算精度,且具有很好的可编程性；通过分析和对比现有资料,对四叶螺旋桨冰块扭矩激励的计算和设计冰块扭矩随转速的变化关系提出了合理的建议和讨论；最后采用稳态频域求解方式,针对四叶螺旋桨,通过对6S70MC-C型柴油机轴系扭振的冰区加强计算,结果表明90。单冰块冲击工况对轴系扭振状态影响最大,在发生叶片次共振时,中间轴和螺旋桨轴的扭振应力大幅上升,轴系运行状态较危险。
[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.
【学位授予单位】：大连海事大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U664.21

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