摘要
目前细长柔性圆柱体涡激振动响应的研究方法主要包括实验方法、计算流体动力学方法以及半经验模型方法.鉴于实验方法研究成本较高、计算流体动力学方法计算时间较长,本文基于尾流振子模型对线性剪切来流下两端铰接的细长柔性圆柱体涡激振动响应特性进行了半经验模型方法研究.先建立了柔性圆柱体结构振子以及尾流振子之间的耦合模型,紧接着基于二阶精度中心差分格式对耦合模型先离散后迭代进行求解.对不同剪切参数下柔性圆柱体涡激振动响应的振动波长、振动频率、振动位移以及响应频率随时间的变化特性等参数进行了分析.分析结果表明:圆柱体的涡激振动响应由驻波和行波混合组成.当无量纲弯曲刚度较小时,在圆柱体两端附近,驻波占主导;而在圆柱体中间段附近,行波占主导.当无量纲弯曲刚度较大时,在圆柱体整个长度区间上均为驻波占主导.随着剪切参数的增大,振动位移以及振动波长均逐渐减小,而振动频率和频率带宽均逐渐增大.
Nowadays,the study methods of VIV on long flexible cylinders contain experimental method,computational fluid dynamic method and semi-empirical method.Due to the expensive cost of experimental method and the long computational time of computational fluid dynamics method,a semi-empirical method study based on a wake oscillator model has been conducted to determine the response performance of vortex-induced vibration(VIV)on a long flexible cylinder with pinned-pinned ends under linearly sheared currents.The coupled model of the structural oscillator of a flexible cylinder and wake oscillator is established,and then the model is discretized and solved based on a standard central finite di erence method of the second order.The VIV response characteristics including vibration wavelength,vibration frequency,vibration displacement and frequency varied with time at di erent shear parameters are compared.The numerical results show that the VIV response is composed of standing wave response and travelling wave response.For a cylinder with small dimensionless bending sti ness,the standing wave response is dominated near the ends while the travelling wave response is dominated near the middle part.However,for a cylinder with large dimensionless bending sti ness,the standing wave response is dominated along the entire cylinder span.As the sheared current increases,the vibration wavelength and displacement decrease,however,the vibration frequency and frequency width increase.
作者
高云
邹丽
宗智
Gao Yun;Zou Li;Zong Zhi(State Key Laboratory of Oil and Gas Reservoir Geology and Exploration,Southwest Petroleum University,Chengdu 610500,China;School of Mechanical Engineering,The University of Tokyo,Tokyo 113-8656,Japan;State Key Laboratory of Structural Analysis for Industrial Equipment,Dalian University of Technology,Dalian 116024,China;Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration,Shanghai 200240,China)
出处
《力学学报》
EI
CSCD
北大核心
2018年第1期9-20,共12页
Chinese Journal of Theoretical and Applied Mechanics
基金
国家自然科学基金(51609206
51522902
51579040)
国家留学基金(201608515007)
青岛海洋科学与技术国家实验室开放基金(QNLM2016OPR0402)
中央高校基本科研业务费专项资金(DUT17ZD233)资助项目
关键词
柔性圆柱体
涡激振动
线性剪切来流
尾流振子模型
flexible cylinder
vortex-induced vibration
linearly sheared current
wake oscillator model
作者简介
高云,副教授,主要研究方向:海洋工程水动力学.E-mail:dutgaoyun@163.com
