Jamal Zare

Shahrekord University

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Hamid M. Sedighi

Shahid Chamran University of Ahvaz

Arash Reza

Islamic Azad University, Ahvaz Branch

Kourosh Heidari Shirazi

Shahid Chamran University of Ahvaz

Alireza Shateri

Shahrekord University

Seyed Jalalodin Hashemi

Gholamreza Rashed

Petroleum University of Technology

Afshin Ahmadi Nadooshan

Shahrekord University

Farhang Daneshmand

University of Scranton

Yaghoub Tadi Beni

Shahrekord University

Seyed Reza Shadizadeh

Petroleum University of Technology

Cooperative Institutions

Shahrekord University

Shahid Chamran University of Ahvaz

Islamic Azad University, Ahvaz Branch

Petroleum University of Technology

National Iranian Oil Company (Iran)

Soil Conservation and Watershed Management Research

Agricultural Research & Education Organization

Graduate University of Advanced Technology

KBR (United States)

Islamic Azad University, Tehran

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Pull-in behavior analysis of vibrating functionally graded micro-cantilevers under suddenly DC voltage

DOAJ (DOAJ: Directory of Open Access Journals) (2015)

Jamal Zare

The present research attempts to explain dynamic pull-in instability of functionally graded micro-cantilevers actuated by step DC voltage while the fringing-field effect is taken into account in the vibrational equation of motion. By employing modern asymptotic approach namely Homotopy Perturbation Method with an auxiliary term, high-order frequency-amplitude relation is obtained, then the influences of material properties and actuation voltage on dynamic pull-in behavior are investigated. It is demonstrated that the auxiliary term in the homotopy perturbation method is extremely effective for higher order approximation and two terms in series expansions are sufficient to produce an acceptable solution. The strength of this analytical procedure is verified through comparison with numerical results.

10.22055/jacm.2014.10552

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Citations (11)

The effect of quintic nonlinearity on the investigation of transversely vibrating buckled Euler-Bernoulli beams

Journal of Theoretical and Applied Mechanics/Mechanika Teoretyczna i Stosowana (2013)

Hamid M. Sedighi Arash Reza Jamal Zare

A new formulation of vibrations of the axially loaded Euler-Bernoulli beam with quintic nonlinearity is investigated in the present study. The beam nonlinear natural frequency as a function of the initial amplitude is obtained. In this direction, modern powerful analytical methods namely He's Max-Min Approach (MMA) and Amplitude-Frequency Formulation (AFF) are employed to approximate the frequency-amplitude relationship of the beam vibrations. Afterwards, it is clearly shown that the first term in the series expansions is sufficient to produce a highly accurate approximation of the nonlinear system. Finally, preciseness of the present analytical procedures is evaluated in contrast with numerical calculation methods.

Quintic function

Axial symmetry

Natural frequency

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Citations (6)

The influence of dispersion forces on the dynamic pull-in behavior of vibrating nano-cantilever based NEMS including fringing field effect

Archives of Civil and Mechanical Engineering (2014)

Hamid M. Sedighi Farhang Daneshmand Jamal Zare

Nanoelectromechanical systems

Structural material

10.1016/j.acme.2014.01.004

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Citations (43)

An analytic solution of transversal oscillation of quintic non-linear beam with homotopy analysis method

International Journal of Non-Linear Mechanics (2012)

Hamid M. Sedighi Kourosh Heidari Shirazi Jamal Zare

Homotopy Analysis Method

Transversal (combinatorics)

Oscillation (cell signaling)

Quintic function

Natural frequency

10.1016/j.ijnonlinmec.2012.04.008

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Citations (81)

Managed Pressure Drilling to Increase Rate of Penetration and Reduce Formation Damage

Petroleum Science and Technology (2014)

Jamal Zare Seyed Reza Shadizadeh

AbstractOne of the advantages of managed pressure drilling (MPD) is an increase in drilling speed and a reduction of mud filtrate invasion as a result of decreasing pressure differential. Reduction of overbalanced pressure (OBP) leads to a decrease of confining pressure around the formation rock and consequently the rock is broken more easily under the bit action and therefore the rate of penetration (ROP) increases. It is also obvious that decreasing the overbalanced pressure results a reduction in mud filtrate invasion and formation damage. In the present article the effect of MPD on increasing rate of penetration and decreasing mud filtrate invasion is studied. Artificial neural networks (ANN) were implemented to develop a model for estimation of ROP by using operational inputs including overbalanced pressure. Using the ANN model, the effect of OBP was analyzed. The effect of OBP on mud filtrate invasion was studied by using developed models of the process and simple Darcy’s law. The results demonstrated that MPD leads to about 30% increase in rate of penetration and 50% decrease in mud filtrate invasion.Keywords: formation damagemanaged pressure drillingneural networksoverbalanced drillingrate of penetration NOMENCLATUREppressurePireservoir pressurePccapillary pressurepwpressure at the formation sand facepepressure at the effluent side of the formationQcumulative particle free filtrate volumerradial distanceRmcradius of mud cakerwformation sand face radiusttimeμwviscosity of waterμoviscosity of oilCwconstantCoconstantKmatrix permeability to liquidkrwrelative permeability to waterkrorelative permeability to waterKmceffective filtercake permeabilitySwwater saturationhformation thicknesskcfiltercake permeability

Rate of penetration

Penetration (warfare)

Penetration rate

Overburden pressure

10.1080/10916466.2010.540618

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Citations (11)

Instability threshold of rippled carbon nanotube nanotweezers in the low vacuum gas flow incorporating Dirichlet and Neumann modes of Casimir energy

Physica E Low-dimensional Systems and Nanostructures (2017)

Jamal Zare Alireza Shateri

10.1016/j.physe.2017.03.007

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Citations (10)

Finite element analysis of drillstring lateral vibration

Scientific Research and Essays (2011)

Jamal Zare Seyed Jalalodin Hashemi Gholamreza Rashed

Lateral vibration is recognized as the leading cause of drillstring and bottom hole assembly (BHA) failures, shocks and severe damages to borehole wall. This study presents a finite element model using ANSYS software to investigate the drillstring lateral vibrations in slightly deviated wells. The analysis proceeds in two stages. At first, a nonlinear static analysis is performed to determine the effective length of the string where it is free to vibrate in the lateral direction. The second stage consists in modal, harmonic and transient dynamic analyses to obtain the lateral vibration modes and natural frequencies, frequency response and time dependent response respectively. The modeling is developed in the presence of mud, friction and nonlinear contact between drillstring and wellbore wall. The effects of drilling mud, drillstring length, well inclination and WOB are considered. The model was compared with experimental and simulated results obtained from several BHA configurations, giving excellent results. Key words: Drillstring, finite element model, lateral vibration, nonlinear contact model.

Natural frequency

Drill string

10.5897/sre10.1186

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Citations (10)

Novel equivalent function for deadzone nonlinearity: applied to analytical solution of beam vibration using He's Parameter Expanding Method

Latin American Journal of Solids and Structures (2012)

Hamid M. Sedighi Kourosh Heidari Shirazi Jamal Zare

This study intends to introduce the novel and efficient exact equivalent function (EF) for well-known deadzone nonlinearity. To indicate the effectiveness of this EF, the nonlinear vibration of cantilever beam in presence of deadzone nonlinear boundary condition is studied. The powerful analytical method, called He's Parameter Expanding Method (HPEM) is used to obtain the exact solution of dynamic behavior of mentioned system. It is shown that one term in series expansions is sufficient to obtain a highly accurate solution. Comparison of the obtained solutions using numerical method shows the soundness of this analytical EF.

Dead zone

10.1590/s1679-78252012000400002

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Citations (42)

Vibration analysis of shell‐like curved carbon nanotubes using nonlocal strain gradient theory

Mathematical Methods in the Applied Sciences (2020)

Jamal Zare Alireza Shateri Yaghoub Tadi Beni Afshin Ahmadi Nadooshan

The performance of nanotube‐based resonators is significantly affected by the variation of their natural frequencies. In reality, nanotubes may have some levels of initial imperfection, which definitely changes their vibrational characteristics. In the present article, the vibrational behavior of initially curved nanotubes is investigated on the basis of thin shell theory incorporating the nonlocal strain gradient theory. The three‐dimensional governing equations of motion are derived by adopting the curvilinear coordinate system through Hamilton's principle. A new formulation of Eringen's model containing the higher‐order strain gradients is employed to capture the effects of nonlocality and small scale parameter. Galerkin decomposition method is employed to acquire a bi‐cubic relation for the natural frequency of the considered nanoshell. The effects of different parameters like the ratio of radius of curvature to the cross section radius, small scale and nonlocality, and length‐to‐radius ratio on the variation of the natural frequency are presented. Excellent agreements are found in some comparative studies between the results of this work and those obtained by molecular dynamics and experimental findings in the literature. Finally, some interesting results are found by plotting the variation of natural frequency of the system versus the length‐to‐radius ratio. It is exhibited that by increasing the ratio L / r , the natural frequencies associated with different values of wavenumber m converge to the lower one and the convergence speed is highly dependent to the circumferential wavenumber n.

Wavenumber

Natural frequency

Length scale

Aspect ratio (aeronautics)

10.1002/mma.6599

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Citations (13)

Analytical approximation of nonlinear frequency of cantilever beam vibrations

Journal of Vibroengineering (2012)

Hamid M. Sedighi Arash Reza Jamal Zare

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Citations (1)