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Applied Mathematics and Mechanics(English Edition) 2011年第8期32卷 997-1008页

作者： G.H.RAHIMI M.AREFI M.J.KHOSHGOFTAR Department of Mechanical Engineering Tarbiat Modares University

The exact thermoelastic analysis of a functionally graded piezoelectrical （FGP） rotating cylinder is investigated analytically. The cylinder is subjected to a com- bination of electrical, thermal, and mechanical loads simultaneously. The structure is a simplified model of a rotational sensor or actuator. The basic governing differential equation of the system is obtained by using the energy method. A novel term, named as the additional energy, is introduced to exact the evaluation of the energy functional. The solution to the governing differential equation is presented for two types of boundary conditions including free rotating and rotating cylinders exposed to the inner pressure. The effect of the angular velocity is investigated on the radial distribution of various components. The mentioned structure can be considered as a sensor for measuring the angular velocity of the cylinder subjected to the pressure and temperature. The obtained results indicate that the electrical potential is proportional to the angular velocity.

关键词： functionally graded piezoelectric (FGP) material sensor rotating cylinder angular velocity pressure temperature

Numerical and Experimental Analysis of the Hydrodynamic Performance of a Three-Dimensional Finite-Length rotating cylinder

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Journal of Marine Science and Application 2020年第3期19卷 388-397页

作者： Wei Wang Yuwei Wang Dagang Zhao Yongjie Pang Chunyu Guo Yifan Wang College of Shipbuilding Engineering Harbin Engineering UniversityHarbin 150001China

The hydrodynamic performance of a three-dimensional finite-length rotating cylinder is studied by means of a physical tank and numerical ***,according to the identified influencing factors,a hydrodynamic performance test of the rotating cylinder was carried out in a circulating water *** order to explore the changing law of hydrodynamic performance with these factors,a particle image velocimetry device was used to monitor the flow ***,a computational field dynamics numerical simulation method was used to simulate the flow field,followed by an analysis of the effects of speed ratio,Reynolds number,and aspect ratio on the flow *** results show that the lift coefficient and drag coefficient of the cylinder increase first and then decrease with the increase of the rotational speed *** trend of numerical simulation and experimental results is similar.

关键词： rotating cylinder Magnus Rotational speed ratio Aspect ratio Computational field dynamics Model test

Thermal analysis in swirl motion of Maxwell nanofluid over a rotating circular cylinder

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Applied Mathematics and Mechanics(English Edition) 2020年第9期41卷 1417-1430页

作者： A.AHMED M.KHAN J.AHMED Department of Mathematics Quaid-i-Azam UniversityIslamabad 44000Pakistan Department of Basic Sciences University of Engineering and TechnologyTaxila 47050Pakistan

In this paper,the mechanism of thermal energy transport in swirling flow of the Maxwell nanofluid induced by a stretchable rotating cylinder is *** rotation of the cylinder is kept constant in order to avoid the induced axially secondary ***,the novel features of heat generation/absorption,thermal radiation,and Joule heating are studied to control the rate of heat *** effects of Brownian and thermophoretic forces exerted by the Maxwell nanofluid to the transport of thermal energy are investigated by utilizing an effective model for the nanofluid proposed by *** whole physical problem of fluid flow and thermal energy transport is modelled in the form of partial differential equations(PDEs)and transformed into nonlinear ordinary differential equations(ODEs)with the help of the suitable flow *** acquired results through the technique bvp4c are reported graphically with physical *** analysis reveals that there is higher transport of heat energy in the Maxwell nanoliquid for a constant wall temperature(CWT)as compared with the prescribed surface temperature(PST).Both thermophoretic and Brownian forces enhance the thermal energy transport in the flowing Maxwell ***,the temperature distribution increases with increasing values of the radiation parameter and the Eckert *** is also noted that an increase in Reynolds number reduces the penetration depth,and as a result the flow and transport of energy occur only near the surface of the cylinder.

关键词： Maxwell nanofluid rotating cylinder heat source/sink Joule heating convective condition numerical solution

WEIGHT FUNCTION FOR STRESS INTENSITY FACTORS IN rotating THICK-WALLED cylinder

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Applied Mathematics and Mechanics(English Edition) 2006年第1期27卷 29-35页

作者：陈爱军曾文骥 School of Science

The equation of stress intensity factors（SIF） of internally pressurized thick-walled cylinder was used as the reference case. SIF equation of rotating thick-walled cylinder containing a radial crack along the internal bore was presented in weight function method. The weight function formulas were worked out and can be used for all kinds of depth of cracks, rotating speed, material, size of thick-walled cylinder to calculate the stress intensity factors. The results indicated the validity and effectiveness of these formulas. Meanwhile, the rules of the stress intensity factors in rotating thick-walled cylinder with the change of crack depths and the ratio of outer radius to inner radius were studied. The studies are valuable to engineering application.

关键词： fracture mechanics weight function method rotating cylinder edge crack

Coriolis effect on responses of rotating thin piezoelectric hollow cylinder

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Theoretical & Applied Mechanics Letters 2016年第6期6卷 274-276页

作者： Wenyao Liu Weiqiu Chen Haitian School Ningbo Polytechnic Department of Engineering Mechanics Zhejiang University

Coriolis effect is considered in the analysis of a rotating piezoelectric hollow cylinder. An inhomogeneous Bessel equation governing the radial mechanical displacement is derived, which can be approximated as an Euler type differential equation when the cylinder is very thin. Numerical examples show that the Coriolis effect can he significant under certain conditions.

关键词： Coriolis effect rotating cylinder Piezoelectric material Analytical solution

Thermal stresses in infinite circular cylinder subjected to rotation

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Applied Mathematics and Mechanics(English Edition) 2012年第8期33卷 1059-1078页

作者： A.M.ABD-ALLA G.A.YAHYA Department of Mathematics Faculty of ScienceTaif UniversitySaudi Arabia Department of Physics Faculty of ScienceTaif UniversitySaudi Arabia Department of Physics Faculty of ScienceAswan UniversityAswan 81528AswanEgypt

The present investigation is concerned with the effect of rotation on an infi- nite circular cylinder subjected to certain boundary conditions. An analytical procedure for evaluation of thermal stresses, displacements, and temperature in rotating cylinder subjected to thermal load along the radius is presented. The dynamic thermal stresses in an infinite elastic cylinder of radius a due to a constant temperature applied to a variable portion of the curved surface while the rest of surface is maintained at zero temperature are discussed. Such situation can arise due to melting of insulating material deposited on the surface cylinder. A solution and numerical results are obtained for the stress components, displacement components, and temperature. The results obtained from the present semi-analytical method are in good agreement with those obtained by using the previously developed methods.

关键词： wave propagation thermoelasticity isotropic material rotating cylinder Lam’e potential thermal stress

Leaching Phenomena of Antifouling Agents from Ships＇ Hull Paints

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Journal of Shipping and Ocean Engineering 2016年第5期6卷 269-278页

作者： Ryuji Kojima Toshiaki Shibata Koichi Ueda National Maritime Research Institute 6-38-1 Shinkawa Mitaka Tokyo 1810004 Japan

The effects ofpH, dissolved ion content and relative water velocity on the release rate of an antifouling agent, cuprous oxide, from ships＇ hull paint have been investigated by rotating cylinder tests. Additionally, test paint panels were attached to a vessel and recovered after a certain period of voyage for the validation of the laboratory tests. In the initial period, the release rates are influenced by pH, dissolved ion content and water velocity, but once after a certain period of test, those effects become less significant. These phenomena can be explained when the paint film is fresh, the rate is controlled by chemical reaction, the surface and/or diffusion layer in the water phase governs the rate. After the antifouling substance in the paint film leached out from the near-surface region, a diffused layer （leached layer）, that has little antifouling agent remained, is formed at the surface of the coating, and the diffusion in that layer can be a rate-determining process. The development of the leached layer is affected by a balance between the leaching rate of the antifouling ingredient and paint resin determined by the chemical properties and speed of the water. Thus, the leaching rates of antifouling agents are affected by the history of the paint in the water.

关键词： Antifouling agent leaching rate cuprous oxide rotating cylinder substituted ocean water phosphate buffer solution.

Numerical Study of Improving Aerodynamic Performance of the cylinder Airfoil of Magnus Wind Turbine

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Numerical Study of Improving Aerodynamic Performance of the ...