检索结果-南通市图书馆

Analytical solutions for plane problem of functionally graded magnetoelectric cantilever beam

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 2015年第7期36卷 955-970页

作者： Yanmei YUE Xiaofen YE Kaiyu XU Shanghai Institute of Applied Mathematics and Mechanics Shanghai Key Laboratory of Mechanics in Energy EngineeringDepartment of MechanicsShanghai University

In this paper, an exact analytical solution is presented for a transversely isotropic functionally graded magnetomelectro-elastic （FGMEE） cantilever beam, which is subjected to a uniform load on its upper surface, as well as the concentrated force and moment at the free end. This solution can be applied for any form of gradient distribution. For the basic equations of plane problem, all the partial differential equations governing the stress field, electric, and magnetic potentials are derived. Then, the expressions of Airy stress, electric, and magnetic potential functions are assumed as quadratic polynomials of the longitudinal coordinate. Based on all the boundary conditions, the exact expressions of the three functions can be determined. As numerical examples, the material parameters are set as exponential and linear distributions in the thickness direction. The effects of the material parameters on the mechanical, electric, and magnetic fields of the cantilever beam are analyzed in detail.

关键词： functionally graded material (FGM) analytical solution magnetoelectrie(ME) material cantilever beam plane stress problem

Research on a Ka-Band MEMS Power Sensor Investigated with an MEMS cantilever beam

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Electronics 2020年第2期29卷 378-384页

作者： WANG Debo GU Xinfeng XIE Jiangcheng ZHANG Dong Laboratory of Modern Acoustics of MOE Nanjing University Nanjing University of Posts and Telecommunication

In this work, a novel high overload Ka-band power sensor with a Micro-electro-mechanical system(MEMS) cantilever beam is investigated in order to improve the measurement dynamic range and the *** fabrication of the Ka-band power sensor is divided into front side and back side processing with a combination of surface and bulk micromachining of Ga *** low-power measurement reveals that the terminating-type sensitivity is close to 0.081, 0.076 and0.072 m V/m W at 34, 35 and 36 GHz, respectively. The high-power measurement indicates that the capacitivetype sensitivity is around 4.9 f F/W at Ka-band. The overload power measurements show that the MEMS cantilever beam can improve the dynamic range by increasing the top end of the range into no less than200 m W, and enhance the bandwidth by increasing the top end of the range into no less than 36 GHz. There is an important reference value to achieve the high overload and wide frequency band for the thermoelectric microwave power sensors.

关键词： Power sensor Sensitivity Overload power Micro-electro-mechanical system(MEMS) cantilever beam

Measurement of length-scale and solution of cantilever beam in couple stress elasto-plasticity

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2009年第3期25卷 381-387页

作者： Bin Ji Wanji Chen Jie Zhao State Key Laboratory for Structural Analysis of Industrial Equipment Dalian University of Technology 116023 Dalian China Department of Aeronautics and Space Navigation Shenyang Institute of Aeronautical Engineering Daoyi South Street 37 110136 Shenyang Liaoning China

Owing to the absence of proper analytical solution of cantilever beams for couple stress/strain gradient elasto-plastic theory, experimental studies of the cantilever beam in the micro-scale are not suitable for the determination of material length-scale. Based on the couple stress elasto-plasticity, an analytical solution of thin cantilever beams is firstly presented, and the solution can be regarded as an extension of the elastic and rigid-plastic solutions of pure bending beam. A comparison with numerical results shows that the current analytical solution is reliable for the case of σ0 〈〈 H 〈〈 E, where σ0 is the initial yield strength, H is the hardening modulus and E is the elastic modulus. Fortunately, the above mentioned condition can be satisfied for many metal materials, and thus the solution can be used to determine the material length-scale of micro-structures in conjunction with the experiment of cantilever beams in the micro-scale.

关键词： Material length-scale Couple stress elasto-plasticity Analytical solution cantilever beam

Crack detection of the cantilever beam using new triple hybrid algorithms based on Particle Swarm Optimization

在线全文

学校读者我要写书评

暂无评论

Frontiers of Structural and Civil Engineering 2022年第9期16卷 1127-1140页

作者： Amin GHANNADIASL Saeedeh GHAEMIFARD Department of Civil Engineering University of Mohaghegh ArdabiliArdabil 56199-11367Iran

The presence of cracks in a concrete structure reduces its performance and increases in the size of cracks result in the failure of the ***,the accurate determination of crack characteristics,such as location and depth,is one of the key engineering issues for assessment of the reliability of *** paper deals with the inverse analysis of the crack detection problems using triple hybrid algorithms based on Particle Swarm Optimization(PSO);these hybrids are Particle Swarm Optimization-Genetic Algorithm-Firefly Algorithm(PSO-GA-FA),Particle Swarm Optimization-Grey Wolf Optimization-Firefly Algorithm(PSO-GWO-FA),and Particle Swarm Optimization-Genetic Algorithm-Grey Wolf Optimization(PSO-GA-GWO).A strong correlation exists between the changes in the natural frequency of a concrete beam and the crack ***,the location and depth of a crack in a beam can be predicted by measuring its natural ***,the measured natural frequency can be used as the input parameter of the *** this paper,this is applied to identify crack location and depth in a cantilever beam using the new hybrid *** results show that among the proposed triple hybrid algorithms,the PSO-GA-FA and PSO-GWO-FA algorithms are much more effective than PSO-GA-GWO algorithm for the crack detection.

关键词： crack cantilever beam triple hybrid algorithms Particle Swarm Optimization

CRACK IDENTIFICATION IN STEPPED cantilever beam COMBINING WAVELET ANALYSIS WITH TRANSFORM MATRIX

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Solida Sinica 2009年第4期22卷 360-368页

作者： Weiwei Zhang Zhihua Wang Hongwei Ma College of Science ＆ Engineering Jinan University Guangzhou 510632 China Institute of Applied Mechanics Taiyuan University of Technology Taiyuan 030024 China The Key Laboratory of Disaster Forecast and Control in Engineering Ministry of Education of China Jinan University Guangzhou 510632 China

This paper illustrates the crack identification method combining wavelet analysis with transform matrix. Firstly, the fundamental vibration mode was applied to wavelet analysis. The crack location was found by the peaks of the wavelet coefficients. Secondly, based on the identified crack locations, a simple transform matrix method requiring only the first two tested natural frequencies was used to further identify the crack depth. The present method can be used for crack identification in a complex structure. Numerical results of crack identification of a stepped cantilever beam show that the suggested method is feasible.

关键词： crack cantilever beam wavelet transform matrix

Analytical solution for functionally graded anisotropic cantilever beam under thermal and uniformly distributed load

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第9期8卷 1351-1355页

作者： HUANG De-jin DING Hao-jiang CHEN Wei-qiu Department of Civil Engineering Zhejiang University. Hangzhou 310027. China Faculty of Engineering Ningbo University Ningbo 315211 China

The bending problem of a functionally graded anisotropic cantilever beam subjected to thermal and uniformly dis-tributed load is investigated,with material parameters being arbitrary functions of the thickness coordinate. The heat conduction problem is treated as a 1D problem through the thickness. Based on the elementary formulations for plane stress problem,the stress function is assumed to be in the form of polynomial of the longitudinal coordinate variable,from which the stresses can be derived. The stress function is then determined completely with the compatibility equation and boundary conditions. A practical example is presented to show the application of the method.

关键词： Functionally graded material (FGM) Anisotropic Thermal stress Analytical solution cantilever beam

Approximate analytical solutions and experimental analysis for transient response of constrained damping cantilever beam

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 2010年第11期31卷 1359-1370页

作者：胡明勇王安稳章向明 College of Science Naval University of Engineering

Vibration mode of the constrained damping cantilever is built up according to the mode superposition of the elastic cantilever beam. The control equation of the constrained damping cantilever beam is then derived using Lagrange＇s equation. Dynamic response of the constrained damping cantilever beam is obtained according to the principle of virtual work, when the concentrated force is suddenly unloaded. Frequencies and transient response of a series of constrained damping cantilever beams are calculated and tested. Influence of parameters of the damping layer on the response time is analyzed. Analyitcal and experimental approaches are used for verification. The results show that the method is reliable.

关键词： constrained damping cantilever beam transient response Lagrange's equation mode superposition

NONLINEAR DYNAMIC MODELING AND PERIODIC VIBRATION OF A cantilever beam SUBJECTED TO AXIAL MOVEMENT OF BASEMENT

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Solida Sinica 2002年第2期15卷 133-139页

作者： Feng Zhihua Hu Haiyan Nanjing Univ Aeronaut & Astronaut Inst Vibrat Engn Res Nanjing 210016 Peoples R China

Dynamic modeling of a cantilever beam under an axial movement ofits basement is present- ed. The dynamic equation of motion for thecantilever beam is established by using Kane's equation first andthen simplified through the Rayleigh-Ritz method. Compared with oldermodeling method, which lineari- zes the generalized inertia forcesand the generalized active forces, the present modeling takes thecoupled cubic nonlinearities of geometrical and inertial types intoconsideration.

关键词： cantilever beam parametric excitation dynamic modeling nonlinear dynamics

A Suitable Active Control for Suppression the Vibrations of a cantilever beam

在线全文

学校读者我要写书评

暂无评论

Sound & Vibration 2022年第2期56卷 89-104页

作者： Y.A.Amer A.T.EL-Sayed M.N.Abd EL-Salam Mathematics Department Science FacultyZagazig UniversityZagazigEgypt Basic Sciences Department Modern Academy for Engineering and TechnologyCairoEgypt Basic Sciences Department Higher Technological Institute10th of Ramadan CityEgypt

In our consideration,a comparison between four different types of controllers for suppression the vibrations of the cantilever beam excited by an external force is carried *** four types are the linear velocity feedback control,the cubic velocity feedback control,the non-linear saturation controller(NSC)and the positive position feedback(PPF)*** suitable type is the PPF controller for suppression the vibrations of the cantilever *** approximate solution obtained up to the first approximation by using the multiple scale *** PPF controller effectiveness is studied on the *** used frequency-response equations to investigate the stability of a cantilever *** notified that,there is a good agreement between the analytical solution and the numerical solution.

关键词： cantilever beam cubic velocity feedback control linear velocity feedback control non-linear saturation controller(NSC) positive position feedback(PPF)controller