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Random vortex induced vibration response of suspended flexible cable to fluctuating wind

Applied Mathematics and Mechanics(English Edition) 2023年第12期44卷 2207-2226页

作者： Genjin MU Weiqiu ZHU Maolin DENG Department of Mechanics State Key Laboratory of Fluid Power and Mechatronic SystemsZhejiang UniversityHangzhou 310027China

A popular dynamical model for the vortex induced vibration(VIV)of a suspended flexible cable consists of two coupled *** first equation is a partial differential equation governing the cable *** second equation is a wake oscillator that models the lift coefficient acting on the *** incoming wind acting on the cable is usually assumed as the uniform wind with a constant velocity,which makes the VIV model be a deterministic *** the real world,however,the wind velocity is randomly fluctuant and makes the VIV of a suspended flexible cable be treated as a random *** the present paper,the deterministic VIV model of a suspended flexible cable is modified to a random one by introducing the fluctuating *** the normal mode approach,the random VIV system is transformed into an infinite-dimensional modal vibration *** on whether a modal frequency is close to the aeolian frequency or not,the corresponding modal vibration is characterized as a resonant vibration or a non-resonant *** applying the stochastic averaging method of quasi Hamiltonian systems,the response of modal vibrations in the case of resonance or non-resonance can be analytically ***,the random VIV response of the whole cable can be approximately calculated by superimposing the response of the most influential modal *** numerical simulation results confirm the obtained analytical *** is found that the intensity of the resonant modal vibration is much higher than that of the non-resonant modal ***,the analytical results of the resonant modal vibration can be used as a rough estimation for the whole response of a cable.

关键词： vortex induced vibration(VIV) wake oscillator random response suspended flexible cable fluctuating wind

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Effect of wind fluctuating on self-starting aerodynamics characteristics of VAWT

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Journal of Central South University 2016年第8期23卷 2075-2082页

作者：朱建阳蒋林赵慧 School of Machinery and Automation Wuhan University of Science and Technology

The present work deals with an investigation of the self-starting aerodynamic characteristics of VAWT under fluctuating wind. In contrast to the previous studies, the rotational speed of the turbine is not fixed, the rotation of the turbine is determined by the dynamic interaction between the fluctuating wind and turbine. A weak coupling method is developed to simulate the dynamic interaction between the fluctuating wind and passive rotation turbine, and the results show that if the fluctuating wind with appropriate fluctuation amplitude and frequency, the self-starting aerodynamic characteristics of VAWT will be enhanced. It is also found that compared with the fluctuation amplitude, the fluctuation frequency of the variation in wind velocity is shown to have a minor effect on the performance of the turbine. The analysis will provide straightforward physical insight into the self-starting aerodynamic characteristics of VAWT under fluctuating wind.

关键词： fluctuating wind vertical axis wind turbine(VAWT) self-starting performance weak coupling method fluctuation amplitude and frequency

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Dynamic Characteristics Analysis of Ice-Adhesion Transmission Tower-Line System under Effect of wind-Induced Ice Shedding

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Computer Modeling in Engineering & Sciences 2020年第11期125卷 647-670页

作者： Yongping Yu Lihui Chen JuanjuanWang Guoji Liu College of Construction Engineering Jilin UniversityChangchun130021China College of Physics Jilin UniversityChangchun130012China

The tower line system will be in an unsafe status due to uniform or uneven fall of ice coating which is attached to the surface of tower and *** fall of ice could be caused by wind action or thermal *** order to study the dynamic characteristics of the self-failure of the transmission line under the action of dynamicwind load,a finite elementmodel of the two-span transmission tower line system was *** birth and death element methods are used to simulate the icing and shedding of the *** failure strength is the shedding criterion for ice *** fluctuating wind speed time history of the tower line systemis first simulated,and then the fluctuating wind and the average wind are superimposed to generate the instantaneous wind speed and converted into wind *** dynamic response of the transmission tower line systemunder iced coupling with different wind speeds and different thicknesses of ice coating was *** is the first attempt that the coupling dynamic response of the icing shedding and wind load for the transmission tower-line system is discussed in this *** addition,the dynamic characteristics of wind are *** particular,the limiting mechanical conditions are *** to the simulation results,it is found:because of the ice shedding,the stress of the conductor changes obviously in the first 20 seconds,and the ground wire changes sharply in the first two seconds;the icing of the conductor(ground)wire is gradually deicing under the action of wind vibration;the displacement of tower top increases with the increase of wind speed and icing thickness.

关键词： Tower line system fluctuating wind ice shedding dynamic response wind-induced ice shedding

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