| Author Name | Affiliation | | Yunlong Zhao | State Key Laboratory of Ocean Engineering, School of Naval Architecture, Ocean & Civil Engineering,Shanghai Jiao Tong University, Shanghai 200240, China | | Chidong Che | State Key Laboratory of Ocean Engineering, School of Naval Architecture, Ocean & Civil Engineering,Shanghai Jiao Tong University, Shanghai 200240, China | | Yong Zhou | State Key Laboratory of Ocean Engineering, School of Naval Architecture, Ocean & Civil Engineering,Shanghai Jiao Tong University, Shanghai 200240, China |
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| Abstract: |
| Dynamical performance of pipes conveying fluid on board is of great importance to the reliability of machinery. The dynamic equation of a simply supported wet pipe conveying fluid is presented, taking structural damping of the pipe and viscidity of the fluid into consideration. And the equation is also solved by using Galerkin’s method. Modal identifications based on strain gauge test are carried out on both dry pipes (without fluid in it) and wet pipes (pipes conveying fluid). It is concluded from the comparison of the results that both natural frequency and the damping ratio decrease as the pipe filled with fluid, but the mode shapes vary little. Variation of equivalent damping factor is also tested. Experimental results reveal that the equivalent damping factor of fluid and the damping ratio depend greatly on the initial deformation, and fluid induced damping decreases the universal damping ratio of the pipes conveying fluid. |
| Key words: pipe conveying fluid modal identification strain gauge test damping ratio |
| DOI：10.11916/j.issn.1005-9113.15272 |
| Clc Number:TB122 |
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| Descriptions in Chinese: |
| 基于应变测试的输流管动力学特性实验研究 赵云龙，车驰东，周勇 （上海交通大学 船舶海洋与建筑工程学院） 创新点说明：在假设流体阻尼和结构阻尼的基础上，推导了简支输流管道弯曲振动方程，同时计入了流动及科氏加速度的影响，并利用伽辽金法对方程进行求解。随后，基于应变测试的方法对空管和输流管分别进行了模态识别，并测量了流体的等效粘性阻尼系数。 研究目的： 船舶管路系统为船舶动力系统提供工作所必须的水、油等，其动力学特性对于船舶动力系统的可靠性及船员的适居性有很大的影响。本文对输流管的动力学特性进行分析，为输流管道的可靠性研究提供理论依据 研究方法： 本文的理论分析采用了伽辽金法，实验是采用应变测试的方法 结论： 输流管的固有频率和阻尼比均小于空管，但两者振型区别不大；管道的初始形变大小对于结构的阻尼比和流体等效粘性阻尼系数的影响很大；在大变形下，流体的存在会减小系统的等效阻尼。 关键词：输流管；模态识别；应变测试；阻尼比 |
