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Fundamental Study on Development of Smart Marine Structures

智能海洋结构物发展基础研究

基本信息

批准号：
06452355
负责人：
KIMPARA Isao
金额：
$ 3.52万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06452355/
关键词：
Composite Materials Smart Structures Damage Detection Optical Fiber Vibration Control GFRP Marine Structures Doppler Effect 光ファイバー振動検出レーザドップラー効果

项目摘要

A fundamental study was performed aiming at the realization of a smart marine strucure, in which smart functions such as self-diagnosis or self-repairing are incorporated in structural material itself, in view of enhancing the structural reliability of ocean equipments and structures under severe environmantal conditions.1) The methodology and the construction of sensors for damage detection were examined. Tensile test od singl optical fiber embedded in a resin, tensile and flexure tests of GFRP specimans were carried out, and it was shown that the damage of mebedded optical fibers were detected by OTDR (Optical Time Domain Reflectometer) and the applicability of optical fiber was confirmed as a distributed detector of critical strain. Fiber-optic velocity sensor was developed based on Laser-Doppler effect and deformation of tensile specimen under cyclic load, vibration of cantilever beam specimen were measured with the developed sensor in comparison with strain gages. The applicabilit … More y of fiber-optic strain sensors to marine structures was also discussed.2) The possibility of active vibration control of flexible structure by applying piezoelectric actuators was examined. A cantiever beam specimen was manufactured and tested, in which a Bimorf piezoelectric element was incorporated as an actuator inducing flexural deformation as well as laser deflectometer and strain gages as sensors. A system identification of this active/adaptive atructure was carried out and thr active vibration control performance was evaluated.3) Piezoelectric polymer films (polyvinylidene fluoride : PVDF) and the developed fiber-optic Laser Doppler Vibrometer (LDV) were applied to the vibration control of a flexible composite beam. Theoretical consideration confimed that the control system is always stable. In the experimental study, an analog control circuit was developed and applied to velocity feedback control of multi-modes vibration. The effectiveness of the control system was evaluated by simulation and experiments. Less

为提高海洋设备和结构在恶劣海洋环境下的可靠性，对在结构材料中加入自诊断或自修复等智能功能的智能海洋结构进行了基础性研究。1）研究了损伤检测的方法和传感器的结构。进行了单根光纤在树脂中的拉伸试验、玻璃钢套管的拉伸和弯曲试验，结果表明，光时域反射仪（OTDR）可以检测出光纤的损伤，证实了光纤作为分布式临界应变检测器的适用性。基于激光多普勒效应研制了光纤速度传感器，并对循环载荷下拉伸试样的变形、悬臂梁试样的振动进行了测量，并与应变片进行了比较。适用性 ...更多信息探讨了光纤应变传感器在海洋结构中的应用。2）研究了压电作动器用于柔性结构振动主动控制的可能性。制作了一个悬臂梁试件并进行了测试，其中采用了双压电陶瓷作为驱动器，激光弯沉仪和应变计作为传感器，以诱导弯曲变形。对该主动/自适应结构进行了系统辨识，并对主动振动控制性能进行了评价。3）将压电聚合物薄膜（PVDF）和研制的光纤激光多普勒测振仪（LDV）应用于柔性复合材料梁的振动控制。理论分析表明，控制系统始终是稳定的。在实验研究中，研制了一种模拟控制电路，并将其应用于多模态振动的速度反馈控制。通过仿真和实验验证了控制系统的有效性。少