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Velocity gradient elasticity for nonlinear vibration of carbon nanotube resonators
Hamid M. SEDIGHI, Hassen M. OUAKAD
《结构与土木工程前沿(英文)》 2020年 第14卷 第6期 页码 1520-1530 doi: 10.1007/s11709-020-0672-x
关键词: velocity gradient elasticity theory nanotube resonators differential-quadrature method nonlinear vibration
Analytical and numerical investigation into the longitudinal vibration of uniform nanotubes
null
《机械工程前沿(英文)》 2014年 第9卷 第2期 页码 142-149 doi: 10.1007/s11465-014-0292-z
In recent years, prediction of the behaviors of micro and nanostructures is going to be a matter of increasing concern considering their developments and uses in various engineering fields. Since carbon nanotubes show the specific properties such as strength and special electrical behaviors, they have become the main subject in nanotechnology researches. On the grounds that the classical continuum theory cannot accurately predict the mechanical behavior of nanostructures, nonlocal elasticity theory is used to model the nanoscaled systems. In this paper, a nonlocal model for nanorods is developed, and it is used to model the carbon nanotubes with the aim of the investigating into their longitudinal vibration. Following the derivation of governing equation of nanorods and estimation of nondimensional frequencies, the effect of nonlocal parameter and the length of the nanotube on the obtained frequencies are studied. Furthermore, differential quadrature method, as a numerical solution technique, is used to study the effect of these parameters on estimated frequencies for both classical and nonlocal theories.
关键词: continuum theory differential quadrature method nanorod longitudinal vibration
Anefficient quadrature demodulator for medical ultrasound imaging
Hao ZHOU,Yin-fei ZHENG
《信息与电子工程前沿(英文)》 2015年 第16卷 第4期 页码 301-310 doi: 10.1631/FITEE.1400205
关键词: B-mode ultrasound imaging Color flow imaging Quadrature demodulation Finite impulse response filter
《能源前沿(英文)》 页码 782-795 doi: 10.1007/s11708-023-0905-8
关键词: distributed photovoltaics (DPVs) cluster partitioning improved differential evolution algorithm voltage control consumption capacity of distributed photovoltaics
T. NGUYEN-THOI, A. TRAN-VIET, N. NGUYEN-MINH, T. VO-DUY, V. HO-HUU
《结构与土木工程前沿(英文)》 2018年 第12卷 第1期 页码 92-108 doi: 10.1007/s11709-016-0379-1
关键词: damage assessment damage locating vector method (DLV) differential evolution (DE) multiple damage location assurance criterion (MDLAC) mode shape error function
Solving nonlinear differential equations of Vanderpol, Rayleigh and Duffing by AGM
null
《机械工程前沿(英文)》 2014年 第9卷 第2期 页码 177-190 doi: 10.1007/s11465-014-0288-8
In the present paper, three complicated nonlinear differential equations in the field of vibration, which are Vanderpol, Rayleigh and Duffing equations, have been analyzed and solved completely by Algebraic Method (AGM). Investigating this kind of equations is a very hard task to do and the obtained solution is not accurate and reliable. This issue will be emerged after comparing the achieved solutions by numerical method (Runge-Kutte 4th). Based on the comparisons which have been made between the gained solutions by AGM and numerical method, it is possible to indicate that AGM can be successfully applied for various differential equations particularly for difficult ones. The results reveal that this method is not only very effective and simple, but also reliable, and can be applied for other complicated nonlinear problems.
关键词: Algebraic Method (AGM) Angular Frequency Vanderpol Rayleigh Duffing
M.R. AKBARI,D.D. GANJI,A.R. AHMADI,Sayyid H. Hashemi KACHAPI
《机械工程前沿(英文)》 2014年 第9卷 第1期 页码 58-70 doi: 10.1007/s11465-014-0289-7
In the current paper, a simplified model of Tower Cranes has been presented in order to investigate and analyze the nonlinear differential equation governing on the presented system in three different cases by Algebraic Method (AGM). Comparisons have been made between AGM and Numerical Solution, and these results have been indicated that this approach is very efficient and easy so it can be applied for other nonlinear equations. It is citable that there are some valuable advantages in this way of solving differential equations and also the answer of various sets of complicated differential equations can be achieved in this manner which in the other methods, so far, they have not had acceptable solutions. The simplification of the solution procedure in Algebraic Method and its application for solving a wide variety of differential equations not only in Vibrations but also in different fields of study such as fluid mechanics, chemical engineering, etc. make AGM be a powerful and useful role model for researchers in order to solve complicated nonlinear differential equations.
关键词: Algebraic Method (AGM) tower crane oscillating system angular frequency
Analytical method of capsizing probability in the time domain for ships in the random beam seas
LIU Liqin, TANG Yougang, LI Hongxia
《结构与土木工程前沿(英文)》 2007年 第1卷 第3期 页码 361-366 doi: 10.1007/s11709-007-0048-5
关键词: different survival probability different significant nonlinear differential narrowband
Tuned reactive power dispatch through modified differential evolution technique
S. BISWAS (RAHA), N. CHAKRABORTY
《能源前沿(英文)》 2012年 第6卷 第2期 页码 138-147 doi: 10.1007/s11708-012-0188-8
关键词: reactive power dispatch (RPD) modified differential evolution (MDE) differential evolution algorithm with localizations around the best vector (DELB)
Review of MEMS differential scanning calorimetry for biomolecular study
Shifeng YU, Shuyu WANG, Ming LU, Lei ZUO
《机械工程前沿(英文)》 2017年 第12卷 第4期 页码 526-538 doi: 10.1007/s11465-017-0451-0
Differential scanning calorimetry (DSC) is one of the few techniques that allow direct determination of enthalpy values for binding reactions and conformational transitions in biomolecules. It provides the thermodynamics information of the biomolecules which consists of Gibbs free energy, enthalpy and entropy in a straightforward manner that enables deep understanding of the structure function relationship in biomolecules such as the folding/unfolding of protein and DNA, and ligand bindings. This review provides an up to date overview of the applications of DSC in biomolecular study such as the bovine serum albumin denaturation study, the relationship between the melting point of lysozyme and the scanning rate. We also introduce the recent advances of the development of micro-electro-mechanic-system (MEMS) based DSCs.
关键词: differential scanning calorimetry biomolecule MEMS thermodynamic
基于多智能体微分博弈的数据驱动协同一致控制 Research Article
石宇1,化永朝2,于江龙1,董希旺1,2,任章1
《信息与电子工程前沿(英文)》 2022年 第23卷 第7期 页码 1043-1056 doi: 10.1631/FITEE.2200001
null
《机械工程前沿(英文)》 2014年 第9卷 第2期 页码 191-202 doi: 10.1007/s11465-014-0293-y
In present study, free vibration of cracked beams resting on two-parameter elastic foundation with elastically restrained ends is considered. Euler-Bernoulli beam hypothesis has been applied and translational and rotational elastic springs in each end considered as support. The crack is modeled as a mass-less rotational spring which divides beam into two segments. After governing the equations of motion, the differential transform method (DTM) has been served to determine dimensionless frequencies and normalized mode shapes. DTM is a semi-analytical approach based on Taylor expansion series that converts differential equations to recursive algebraic equations. The DTM results for the natural frequencies in special cases are in very good agreement with results reported by well-known references. Also, the DTM procedure yields rapid convergence beside high accuracy without any frequency missing. Comprehensive studies to analyze the effects of crack location, crack severity, parameters of elastic foundation and boundary conditions on dimensionless frequencies as well as effects of elastic boundary conditions on cracked beams mode shapes are carried out and some problems handled for first time in this paper. Since this paper deals with general problem, the derived formulation has capability for analyzing free vibration of cracked beam with every boundary condition.
关键词: free vibration cracked beam elastic foundation restrained ends differential transform method
Belkacem MAHDAD, K. SRAIRI
《能源前沿(英文)》 2013年 第7卷 第1期 页码 75-89 doi: 10.1007/s11708-012-0222-x
关键词: differential evolution multi-objective function optimal power flow economic dispatch valve point effect environment wind source STATCOM
M. R. AKBARI,M. NIMAFAR,D. D. GANJI,M. M. AKBARZADE
《机械工程前沿(英文)》 2014年 第9卷 第4期 页码 402-408 doi: 10.1007/s11465-014-0316-8
The kinematic assumptions upon which the Euler-Bernoulli beam theory is founded allow it to be extended to more advanced analysis. Simple superposition allows for three-dimensional transverse loading. Using alternative constitutive equations can allow for viscoelastic or plastic beam deformation. Euler-Bernoulli beam theory can also be extended to the analysis of curved beams, beam buckling, composite beams and geometrically nonlinear beam deflection. In this study, solving the nonlinear differential equation governing the calculation of the large rotation deviation of the beam (or column) has been discussed. Previously to calculate the rotational deviation of the beam, the assumption is made that the angular deviation of the beam is small. By considering the small slope in the linearization of the governing differential equation, the solving is easy. The result of this simplification in some cases will lead to an excessive error. In this paper nonlinear differential equations governing on this system are solved analytically by Akbari-Ganji’s method (AGM). Moreover, in AGM by solving a set of algebraic equations, complicated nonlinear equations can easily be solved and without any mathematical operations such as integration solving. The solution of the problem can be obtained very simply and easily. Furthermore, to enhance the accuracy of the results, the Taylor expansion is not needed in most cases via AGM manner. Also, comparisons are made between AGM and numerical method (Runge-Kutta 4th). The results reveal that this method is very effective and simple, and can be applied for other nonlinear problems.
关键词: AGM critical load of columns large deformations of beam nonlinear differential equation
Zi-wu REN,Zhen-hua WANG,Li-ning SUN
《信息与电子工程前沿(英文)》 2015年 第16卷 第7期 页码 607-616 doi: 10.1631/FITEE.14a0335
关键词: Inverse kinematics problem 8-DOF humanoid manipulator Biogeography-based optimization (BBO) Differential evolution (DE)
标题 作者 时间 类型 操作
Velocity gradient elasticity for nonlinear vibration of carbon nanotube resonators
Hamid M. SEDIGHI, Hassen M. OUAKAD
期刊论文
Analytical and numerical investigation into the longitudinal vibration of uniform nanotubes
null
期刊论文
Cluster voltage control method for “Whole County” distributed photovoltaics based on improved differential
期刊论文
A combination of damage locating vector method (DLV) and differential evolution algorithm (DE) for structural
T. NGUYEN-THOI, A. TRAN-VIET, N. NGUYEN-MINH, T. VO-DUY, V. HO-HUU
期刊论文
Analyzing the nonlinear vibrational wave differential equation for the simplified model of Tower Cranesby Algebraic Method
M.R. AKBARI,D.D. GANJI,A.R. AHMADI,Sayyid H. Hashemi KACHAPI
期刊论文
Analytical method of capsizing probability in the time domain for ships in the random beam seas
LIU Liqin, TANG Yougang, LI Hongxia
期刊论文
Tuned reactive power dispatch through modified differential evolution technique
S. BISWAS (RAHA), N. CHAKRABORTY
期刊论文
Review of MEMS differential scanning calorimetry for biomolecular study
Shifeng YU, Shuyu WANG, Ming LU, Lei ZUO
期刊论文
Semi-analytical approach for free vibration analysis of cracked beams resting on two-parameter elastic foundation with elastically restrained ends
null
期刊论文
Solving multi-objective optimal power flow problem considering wind-STATCOM using differential evolution
Belkacem MAHDAD, K. SRAIRI
期刊论文
Scrutiny of non-linear differential equations Euler-Bernoulli beam with large rotational deviation by
M. R. AKBARI,M. NIMAFAR,D. D. GANJI,M. M. AKBARZADE
期刊论文