基于参数化建模的螺旋桨随边削边振动研究

Analysis on vibration of propeller with unilateral edge trimming based on parametric modeling

  • 摘要:
      目的  工程上常采用随边削边法解决因负荷过重所导致的船−机−桨不匹配的问题。针对工程中常使用的随边单边切割法,开展基于参数化建模的螺旋桨随边单边削边振动研究,探究随边削边对螺旋桨振动特性的影响。
      方法  选取4381、4382、4383等型号桨叶为研究算例,结合Matlab编程技术与ANSYS二次开发程序得到不同随边单边切割量对螺旋桨振动特性的影响规律,并分析对应影响规律产生的不同原因。
      结果  对于无侧斜4381桨,其固有频率随随边切割量的增大小幅增加,而模态振型变化不大;对于有侧斜4382及4383桨,随边切割量增加,其固有频率变化规律与无侧斜桨4381基本相同。
      结论  侧斜不会改变螺旋桨在不同随边单边切割量下的振动特性规律;随着随边切割量的增加,两种桨形削边后,固有频率变化率均会明显提升,且在高阶时增幅更为明显。对应的二次开发计算程序可在实际工程中帮助相关人员从振动特性的角度选取最优削边方案,为削边方案的设计和改良提供理论依据和指导。

     

    Abstract:
      Objective   In engineering, the edge trimming method is often used to solve the problem of ship-machine-propeller mismatch caused by excessive load. In order to explore the effects of edge trimming on the vibration characteristics of the propeller, this paper studies the vibration of a propeller with edge trimming based on parametric modeling.
      Method  4381, 4382, 4383 and other types of propellers are selected as research examples, then Matlab programming technology and the ANSYS secondary development program are combined to obtain the influence laws of different unilateral edge trimming on the vibration characteristics of the propeller, and the different reasons behind the corresponding influence laws are analyzed.
      Result  For the 4381 propeller without skew, the natural frequency increases slightly with the increase of the edge trimming amount, but the mode shape does not change much. For the 4382 and 4383 propellers with skew, with the increase of the edge trimming amount, the change law of the natural frequency remains basically the same as that of the 4381 propeller without skew.
      Conclusion  Skew does not change the vibration characteristics of a propeller under different unilateral trimming amounts; with the increase of the trimming amount, the natural frequency change rate of the two types of propeller shapes after chamfering will be significantly improved, and the increase is more pronounced at higher levels. The corresponding secondary development program can help the relevant personnel to select the optimal trimming scheme from the perspective of vibration characteristics in practical engineering, providing a theoretical basis and guidance for the design and improvement of trimming schemes.

     

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