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Dynamic analysis of wind turbine tower structures in complex ocean environment

Applied Mathematics and Mechanics(English Edition) 2020年第7期41卷 999-1010页

作者： Guanzhong LIU Xingming GUO Li ZHU Shanghai Institute of Applied Mathematics and Mechanics Shanghai Key Laboratory of Mechanics in Energy EngineeringSchool of Mechanics and Engineering ScienceShanghai UniversityShanghai 200072China School of Mathematics and Computational Sciences Xiangtan UniversityXiangtan 411105Hunan ProvinceChina

Studying and analyzing the dynamic behavior of offshore wind turbines are of great importance to ensure the safety and improve the efficiency of such expensive *** this work,a tapered beam model is proposed to investigate the dynamic response of an offshore wind turbine tower on the monopile foundation assembled with rotating blades in the complex ocean *** environment factors like wind,wave,current,and soil resistance are taken into *** proposed model is ana-lytically solved with the Galerkin *** on the numerical results,the effects of various structure parameters including the taper angle,the height and thickness of the tower,the depth,and the diameter and the cement filler of the monopile on the funda-mental natural frequency of the wind turbine tower system are investigated in *** is found that the fundamental natural frequency decreases with the increase in the taper angle and the height and thickness of the tower,and increases with the increase in the diameter of the ***,filling cement into the monopile can effectively im-prove the fundamental natural frequency of the wind turbine tower system,but there is a critical value of the amount of cement maximizing the property of the *** research may be helpful in the design and safety evaluation of offshore wind turbines.

关键词： wind turbine tower structure dynamic analysis tapered beam fundamen-tal natural frequency complex ocean environment

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Performance enhancement of cantilever piezoelectric energy harvesters by sizing analysis

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International Journal of Smart and Nano Materials 2020年第2期11卷 93-116页

作者： Peyman Hajheidari Ion Stiharu Rama Bhat Department of Mechanical Industrial and Aerospace Engineering(MIAE)University of ConcordiaMontrealQuébecCanada

This paper presents the results of the performance of piezoelectric cantilever beams in relation to their *** total produced power represents the main indicator of performance of a piezoelectric harvesting system while the area of the beams stays *** design is an important aspect in any industry,mainly in the *** this study,the effects of non-uniformity on the efficiency and power output are *** element method(FEM)with the application of superconvergent element(SCE)is adopted here to solve the *** is observed that the trapezoidal geometry(converging beam)provides a higher output power while the efficiency ***,in order to prove that the power enhancement is achievable while the amount of piezoelectric material consumed is constant the new configuration is *** the configuration,an array of uniform beams connected in series is used instead of one single rectangular *** proposed setting generates an output power of 1.817mWat a resonant frequency of 284.6 Hz when excited by an input acceleration of 1 *** only challenge is the fundamental frequency difference which ismet with the application of proof mass and thinner substrate and piezoelectric layers.

关键词： Piezoelectric energy harvester superconvergent element tapered beam performance enhancement sizing

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Curve Optimization of tapered Cantilever beams Under Tip Loads

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Advances in Applied Mathematics and Mechanics 2021年第6期13卷 1485-1500页

作者： Minyi Zhu Guobin Gong Jun Xia Department of Civil Engineering Xi’an Jiaotong—Liverpool UniversitySuzhouJiangsu 215123China

The study adopts the variational method for analyzing the cantilever tapered beams under a tip load as well as a definite end displacement,and further determining the optimized shapes and materials that can minimize the *** types of beams are taken into account,i.e.,the Euler-Bernoulli beam without considering shear deformation and the Timoshenko beam with shear *** using the energy theorem and the reference of isoperimetric problem,the width variation curves and the corresponding minimum masses are derived for both beam *** optimized curve of beam width for the Euler-Bernoulli beam is found to be a linear function,but nonlinear for the Timoshenko *** is also found that the optimized curve in the Timoshenko beam case starts from non-zero at the tip end,but its tendency gradually approaches the one of the Euler-Bernoulli *** results indicate that with the increase of the Poisson’s ratio,the required minimum mass of the beam will increase no matter how the material changes,suggesting that the optimized mass for the case of Euler-Bernoulli beam is the lower boundary limit which the Timoshenko case cannot go ***,the ratio r/E(density against Elastic Modulus)of the material should be as small as possible,while the ratio h2/L4 of the beam should be as large as possible in order to minimize the mass for the case of Euler-Bernoulli beam,of which the conclusion is extended to be applicable for the case of Timoshenko *** addition,the optimized curves for Euler-Bernoulli beam types are all found to be power functions of length for both tip point load cases and uniform load cases.

关键词： tapered beam Euler-Bernoulli beam Timoshenko beam variational principle isoperimetric problem curve optimization

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