Analysis of asymmetrical shaft power increase during tight manoeuvres
Analysis of asymmetrical shaft power increase during tight manoeuvres
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发表时间：
2007
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通讯作者：
M. Viviani;C. P. Bonvino;S. Mauro;M. Cerruti
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作者：
M. Viviani;C. P. Bonvino;S. Mauro;M. Cerruti
本文通过对一系列双桨舰船在不同航速和舵角下的回转圆周运动的分析，研究了紧凑操纵过程中轴功率不对称增大的现象；这一分析强调了一个共同的趋势，即尽管所考虑的船舶有很大差异，但轴功率增大是不对称的；分析了轴功率增大的可能原因，并报告了操纵过程中尾迹分数不对称变化的数据，再次显示了一个共同的趋势，但数据分散较大。在这种观点下，已经开展了关于进行专门的自由航行模型试验并将其结果扩大到全尺度的可能性的第一次调查，以便在初步设计阶段提高对特定船舶的预测精度。人们认为，对于非常规推进装置的布置，例如，两个轴由同一原动机通过独特的减速装置提供动力，自动化装置将需要仔细监测这些影响，以避免可能出现的问题。
In the present work the phenomenon of asymmetrical shaft power increase during tight maneuvers is investigated by means of the analysis of turning circle maneuvers at different speeds and rudder angles performed during sea trials for a series of twin screw naval ships; this analysis has allowed to underline a common trend for asymmetrical shaft power increase despite significant differences in ships considered; possible reasons for this shaft power increase have been examined, and data about an asymmetrical variation of wake fraction during maneuvers are reported, showing again a common trend but with larger scatter of data. In this view, a first investigation about the possibility of performing dedicated free running model tests and scaling their results to full scale, in order to improve prediction accuracy for a specific ship in preliminary design phases, has been carried out. It is believed that, for unconventional propulsion plant arrangements, in which for instance two shaft axes are powered by the same prime mover via a unique reduction gear, automation plant will need to monitor carefully these effects, in order to avoid possible problems.