文章摘要
船用螺旋桨流固耦合振动特性分析
FSI vibrations characteristics analysis of marine propeller blade
投稿时间:2018-07-23  修订日期:2018-09-14
DOI:
中文关键词: 螺旋桨振动  流固耦合  瞬态激励实验  直接耦合数值计算  经验公式法
英文关键词: Propeller Vibration  Fluid-structure Interface, FSI  Modal test  strong coupling method numerical solution  empirical method
基金项目:
作者单位E-mail
娄本强 江苏科技大学 benqiang.lou@hotmail.com 
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中文摘要:
      摘要:在船舶航行过程中,应尽量避免“当激振力的频率与螺旋桨结构固有频率接近时所产生的共振”。对螺旋桨还需要分析其湿模态振动特性,以达到“避振”的效果。本文针对螺旋桨振动特性开展系统分析: 1)在数值计算中采用直接耦合法,模拟周围流场;2)利用瞬态激励实验方法,对某实桨进行测量,得到固有频率和振型; 3)对流固耦合振动结果进行分析,提出“湿模态频率”经验公式,可以迅速估算“湿”模态的固有频率。 研究结果表明:数值计算与试验结果吻合较好;采用直接耦合法具有精度高和收敛性好的优点;根据工程实际应用要求,提出经验公式,结果精度满足要求,应用于实际设计的初始阶段可以大大节省时间,提高效率。
英文摘要:
      Abstract: ‘Propeller‘,the only power resource of ships, is the most important merchant naval applications for the propulsion system, which will affect the capability of the ship survivability and reliability seriously. ‘Resonance’ will oscillate the blade with greater amplitude deformation, when hydro excited force drives the propeller around a specific frequency. The effect of the water where the propeller is immersed causes a reduction in modal frequency and a modified mode shape compared with the corresponding characteristics in air. In order to avoid the resonance disasters, it will be necessary to analysis ‘Fluid-structure interface’ vibration characteristics of the propeller blade. The major concern of this paper is to understand the problem of FSI blade vibration using 1) multi-points transient modal test were applied on the real Cu propeller for the structural and FSI modes characteristics; 2) high-order solid element were employed to build the structural FE model with the water field simulations; 3) a simple estimation method was founded that the fundamental frequency could be described quickly by an empirical formula, combined with the frequency reduction ratio λ. It has been discovered in the paper that good agreement between FEM and tests has been achieved, and ‘strong coupling method’ was used because of the advantages of ‘quick convergence’, ‘time integration’ and ‘computational flexibility’. The empirical method, whilst giving a reasonable approximation, has the advantage of being simple and time efficient for initial design. Furthermore, the frequency reduction caused by the water is not a constant value, and the relationship will need to be investigated, and the boundary impact as well.
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