基于阻抗失配原理的L延拓型船用隔振基座研究

Study of L-extension type ship vibration isolation pedestal based on impedance mismatch principle

    摘要
  • 摘要:
      目的  传统基座对振动的抑制能力有限，需要开展新型基座结构形式的研究，以达到提高基座隔振性能的目的。
      方法  首先，基于阻抗失配原理构造一种L延拓型结构胞元；然后，对通过直壁胞元和L延拓型胞元延展得到的直壁基座与新型一体化基座进行力学性能的对比分析，并采用轻量化设计新型基座及得到分块化基座；最后，通过改变胞元内L型结构的厚度比例关系，以进一步检验提升新型分块化基座的隔振效果。
      结果  研究表明，在基座重量相近的前提下，新型基座在10~250 Hz频段总振级落差较直壁基座提高了40.56%。
      结论  研究证明了L延拓型胞元结构对振动波传递有明显抑制作用，结果可为新型船用隔振基座设计提供一定的参考。

     

    Abstract:
      Objectives  As the traditional pedestal has limited vibration suppression ability, it is necessary to design a new type of pedestal structure to improve its performance in this aspect.
      Methods  First, based on the principle of impedance mismatch, a kind of L-extension structural cell is constructed. The mechanical properties of the straight-wall pedestal and new integrated pedestal are then compared and analyzed, therefore, the new type of pedestal is designed as lightweight to obtain a block pedestal. Finally, by changing the ratio of the thickness of the L-shaped structure in the cell, the vibration isolation effects of the new block pedestal are further improved.
      Results  The results show that under the premise that the weight of the pedestals are similar, the total vibration level drop of the new pedestal in the whole frequency band of 10-250 Hz is increased by 40.56% compared with that of the straight-wall pedestal.
      Conclusions  It concludes that the L-extension cell structure proposed in this paper has obvious inhibitory effects on vibration wave transmission, and that the L-extension cell structure can provide references for the design of new marine vibration isolation pedestals.

     

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