Underwater Free-Vibration Analysis of Full-Scale Marine Propeller Using a Fiber Bragg Grating-Based Sensor System
Underwater Free-Vibration Analysis of Full-Scale Marine Propeller Using a Fiber Bragg Grating-Based Sensor System
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DOI：
10.1109/jsen.2015.2490478
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发表时间：
2016-02
影响因子：
4.3
通讯作者：
S. Javdani;M. Fabian;J. Carlton;T. Sun;K. Grattan
中科院分区：
文献类型：
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作者：
S. Javdani;M. Fabian;J. Carlton;T. Sun;K. Grattan
详细的实验为基础的研究已经进行了仪表，全尺寸的船舶螺旋桨叶片，以调查他们的振动行为，无论是在空气中和水下。为了获得对叶片特性扰动最小的数据，首次设计并实现了基于光纤光栅的传感器网络系统。在每个测量点的个别振动频率，从而更广泛的振动模式看到每个叶片，与激励在空气中和水中，结果相比，从有限元分析获得的有利。获得的振动模式表明，相同的振动模式发生在空气中和水中，虽然在某些固有频率，模式的顺序被认为是改变从一个叶片到另一个在同一个螺旋桨。进行的广泛性能调查和获得的实验数据还表明，虽然水的附加质量对叶片在基本模式下的固有频率的影响是相当大的，但这种影响随着叶片的固有频率的增加而减小。从光纤传感器网络获得的结果进行了比较，从以前的工作在这方面使用不同的和不太令人满意的技术，它被证实，在水中的自然频率的比率，在空气中的频率以线性方式增加。此外，还测量了不同螺旋桨浸入深度下叶片的固有频率。
A detailed experimentally-based study has been carried out on instrumented, full-scale marine propeller blades in order to investigate their vibration behaviour, both in air and underwater. To obtain data with minimum perturbation to the characteristics of the blades, a fiber Bragg grating-based sensor network system was designed and implemented, for the first time. The individual vibration frequencies at each measurement point and thus the broader vibration patterns seen for each of the blades were obtained, with excitation both in air and in water and the results are compared favourably with those obtained from finite-element analysis. The vibration patterns obtained show that the same modes of vibration occur in air and in water, although in some natural frequencies, the mode order is seen to change from one blade to another on the same propeller. The extensive performance survey carried out and experimental data obtained have also shown that while the effect of the added mass of water on the natural frequencies of the blades in the fundamental modes is considerable, this effect diminishes as the natural frequencies of the blades increase. The results obtained from the optical fiber sensor network were compared with those from previous work in this area using different and less satisfactory techniques and it was confirmed that the ratio of the natural frequencies in water to those in air increases in a linear manner as the frequencies were increasing. In addition, the natural frequencies of a blade were measured under different depths of propeller immersion.