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Journal ArticleDOI

Nonlinear vibrations and frequency response analysis of a cantilever beam under periodically varying magnetic field

TL;DR: In this paper, the nonlinear vibration of a cantilever beam with tip mass subjected to periodically varying axial load and magnetic field has been studied and the temporal equation of motion of the system containing linear and nonlinear parametric excitation terms along with nonlinear damping, geometric and inertial types of nonlinear terms has been derived and solved using method of multiple scales.
Abstract: In this paper, nonlinear vibration of a cantilever beam with tip mass subjected to periodically varying axial load and magnetic field has been studied. The temporal equation of motion of the system containing linear and nonlinear parametric excitation terms along with nonlinear damping, geometric and inertial types of nonlinear terms has been derived and solved using method of multiple scales. The stability and bifurcation analysis for three different resonance conditions were investigated. The numerical results demonstrate that while in simple resonance case with increase in magnetic field strength, the system becomes unstable, in principal parametric or simultaneous resonance cases, the vibration can be reduced significantly by increasing the magnetic field strength. The present work will be very useful for feed forward vibration control of magnetoelastic beams which are used nowadays in many industrial applications.
Citations
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Journal ArticleDOI
TL;DR: In this paper, a nonlinear magneto-elastic combined resonance of parametric and forced excitations is investigated for a rotating circular plate with a variable speed under alternating load.
Abstract: Nonlinear magneto-elastic combined resonance of parametric and forced excitations is investigated for a rotating circular plate with a variable speed under alternating load. According to the magneto-elastic vibration equations of a conductive rotating thin circular plate, the axisymmetric vibration differential equations of the rotating circular plate under transverse magnetic field are obtained through the application of the Galerkin integral method. The method of multiple scales is applied to solve the differential equations of the circular plate under alternating magnetic field, and the resonance states of the system under combined parametric and forced excitations are obtained by analyzing secular terms. The respective amplitude–frequency response equations are also derived, as well as the necessary and sufficient conditions of the system to make it stable. A numerical method is adopted to acquire amplitude–frequency response curves, bifurcation diagrams of amplitude and the variation pattern of amplitude with magnetic induction intensity and radial force. The influence of parameter variation on stability of the system is also investigated. Based on the global bifurcation diagram of the system, the influence of the change of bifurcation parameters on the system dynamics is discussed.

6 citations

Journal ArticleDOI
TL;DR: In this article, a micro-beam is modeled with specific attention to its application in AFM and the effects of damping ratio on vibration responses are presented, and the effect of micro-pump load, excitation voltage, and initial twist angle are investigated on the amplitude of vibration and natural frequency of system.
Abstract: In this paper, vibration suppression of a micro-beam covered by a piezoelectric layer is studied. The micro-beam is modeled with the specific attention to its application in AFM. The AFM micro-beam is a cantilever one which is stimulated close to its natural frequency by applying a harmonic voltage to the piezoelectric layer. The beam is an Euler-Bernoulli beam which abbeys Kelvin-Voigt model. Using such model supplies the comparison between elastic and viscoelastic beams; and one of the most important properties of viscoelastic materials, damping effect can readily be investigated. The pump provides an axial load with the result that it suppresses the vibrations. First, the vibration equations are extracted using Lagrangian and extended Hamiltonian method in vertical, longitudinal, as well as torsional directions and are discretized by exploiting the Galerkin mode summation approach. The discretized time-domain equations are solved by the aid of the Runge-Kutta method. The viscoelastic beam is compared with the elastic one, and the effects of damping ratio on vibration responses are presented. Additionally, the effects of micro-pump load, excitation voltage, and initial twist angle are investigated on the amplitude of vibration and natural frequency of system. It is observed that viscoelasticity of beam and axial load of the pump reduce vibrations and provide uniform time-domain responses without beatings.

6 citations

Journal ArticleDOI
TL;DR: This article presents the dynamic modeling and nonlinear analysis of two-link flexible manipulator with generic payload whose center of gravity is different than the point of attachment with the generic payload.
Abstract: This article presents the dynamic modeling and nonlinear analysis of two-link flexible manipulator with generic payload whose center of gravity is different than the point of attachment with the li

4 citations


Cites background from "Nonlinear vibrations and frequency ..."

  • ...Communicated by Chandrika Prakash Vyasarayani 2020 Taylor & Francis Group, LLC Kumar and Pratiher 2020; Mehrjooee, Dehkordi, and Korayem 2020; Piedboeuf and Moore 2002; Pratiher and Dwivedy 2011) and hence significant literature is available....

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Journal ArticleDOI
TL;DR: In this paper, a novel design of electromagnetic side sealing is proposed to further promote its realization in the field of TRSC, based on the liquid metal flow under the magnetic field.
Abstract: In this paper, a novel design of electromagnetic side sealing is proposed to further promote its realization in the field of TRSC. Based on the liquid metal flow under the magnetic field, the magne...

4 citations


Cites background from "Nonlinear vibrations and frequency ..."

  • ...Twin-roll strip casting-rolling process. electric field intensity E, and electric displacement vector D (Pratiher and Dwivedy 2011)....

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Journal ArticleDOI
TL;DR: In this paper, an analytical procedure to predict the beams nonlinear natural frequencies using first-order shear deformation theory is presented, where the nonlinear kinematics assumptions include the mod...
Abstract: This article presents an analytical procedure to predict the beams nonlinear natural frequencies using the first-order shear deformation theory. The nonlinear kinematics assumptions include the mod...

3 citations

References
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Journal ArticleDOI

91 citations


"Nonlinear vibrations and frequency ..." refers background in this paper

  • ...It may also be noted that by neglecting parametric term f2 cos ̄2 q due to the presence of force excitation, the present system can be reduced to that of Pratiher and Dwivedy (2009). It has also been observed that the equation of motion contains additional nonlinear terms of geometric and inertial type than those obtained in Shih et al....

    [...]

  • ...It may also be noted that by neglecting parametric term f2 cos ̄2 q due to the presence of force excitation, the present system can be reduced to that of Pratiher and Dwivedy (2009). It has also been observed that the equation of motion contains additional nonlinear terms of geometric and inertial type than those obtained in Shih et al. (1998) and Liu and Chang (2005)....

    [...]

Journal ArticleDOI
TL;DR: In this paper, the parametric instability regions of a cantilever beam with tip mass subjected to time-varying magnetic field and axial force were investigated using second-order method of multiple scales.
Abstract: The present work deals with the parametric instability regions of a cantilever beam with tip mass subjected to time-varying magnetic field and axial force. The nonlinear temporal differential equation of motion having two frequency parametric excitations is solved using second-order method of multiple scales. The closed-form expressions for the parametric instability regions for three different resonance conditions are determined. The influence of magnetic filed, axial load, damping constant and mass ratio on the parametric instability regions are investigated. These results obtained from perturbation analysis are verified by solving the temporal equation of motion using fourth-order Runge–Kutta method. The instability regions obtained using this method is found to be in good agreement with the experimental result.

34 citations


"Nonlinear vibrations and frequency ..." refers background or methods in this paper

  • ...The expressions for h1 h2 · · ·h14 are same as those given in Pratiher and Dwivedy (2009)....

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  • ...Following Pratiher and Dwivedy (2009), and using single mode approximation, i....

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  • ...Similar to Pratiher and Dwivedy (2009), using D’Alembert’s principle the following governing differential equation of motion of the system has been obtained in terms of transverse displacement v....

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  • ...It may be recalled from the work of Pratiher and Dwivedy (2009) where only the trivial state instability regions were plotted, that the system is prone to vibration only in the region R1R2....

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  • ...For numerical simulation, a steel beam has been taken similar to that considered in Pratiher and Dwivedy (2007) with length L = 0 5m, width d = 0 005m, depth h = 0 001m, Young’s Modulus E = 194GPa, mass of the beam per unit length m = 0 03965 kg, damping constant cd = 0 01N-s/m, relative permeability r = 3000, material conductivity = 107 Vm−1, and the permeability of the vacuum, 0 = 1 26× 10−6 Hm−1....

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Journal ArticleDOI
TL;DR: In this paper, an electromagnetic device acting like a spring with alternating stiffness was designed to parametrically excite the beam, and the frequency and amplitude of the excitation force were accurately controlled by the AC current flowing through the coil of the electromagnetic device.
Abstract: The parametric instability of a beam under electromagnetic excitation was investigated experimentally and analytically. In experiment an electromagnetic device, acting like a spring with alternating stiffness, was designed to parametrically excite the beam. The frequency and the amplitude of the excitation force were accurately controlled by the AC current flowing through the coil of the electromagnetic device. Since the excitation force is a non-contact electromagnetic force which acts on the beam in the transverse direction, the disturbances induced by the geometric imperfection of the beam, by the eccentricity of the usual axial excitation force, and the coupling effects between the excitation mechanism and the beam were effectively avoided. The dynamic system was analyzed based on the assumed-modes method. The instability regions of the system were found to be the functions of the modal parameters of the beam and the position, the stiffness of the electromagnetic device for various cantilevered beams. The modal damping ratios of the beam specimens were also identified. The experimental results were found to agree well with the analytical ones.

32 citations


"Nonlinear vibrations and frequency ..." refers background in this paper

  • ...(2000), Chen and Yah (2001), Wu (2005), and Pratiher and Dwivedy (2007) studied beam-plate systems subjected to transverse magnetic field. In all these cases authors have studied only the trivial state responses of the system and parametric instability regions were determined. However, practically, most of the engineering structures exhibit nonlinear behavior which cannot be predicted from these analyses. Few authors’ viz., Kojima and Nagaya (1985), Lu et al. (1995), Shih et al. (1998), Liu and Chang (2005), and Pratiher and Dwivedy (2009) have studied the nonlinear response of the elastic beams subjected to alternating electromagnetic field. For a more detailed review on parametrically excited beam subjected to magnetic field one may refer authors earlier works of Pratiher and Dwivedy (2007, 2009). From these literatures it has been observed that no research has been carried out to find the frequency response for magnetoelastic cantilever beam with tip mass subjected to periodic axial load. Hence, in the present work an attempt has been made to obtain the frequency response curves for such systems. Here, the governing temporal equation of motion of the system has been obtained which contains nonlinear damping, linear and nonlinear parametric excitation terms, in addition to the geometric and inertial types of nonlinear terms. By neglecting the effect of periodically varying axial load, the present system is similar to that of Pratiher and Dwivedy (2009) and by neglecting the geometric and inertial nonlinear terms, the present equation of motion is similar to that of Lu et al. (1995), Shih et al. (1998), and Liu and Chang (2005). The influences of the amplitude of magnetic field strength, attached tip mass, and static and dynamic amplitude of axial load on the frequency response curves have been investigated....

    [...]

  • ...Moon and Pao (1969), Wu et al. (2000), Chen and Yah (2001), Wu (2005), and Pratiher and Dwivedy (2007) studied beam-plate systems subjected to transverse magnetic field....

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  • ...(2000), Chen and Yah (2001), Wu (2005), and Pratiher and Dwivedy (2007) studied beam-plate systems subjected to transverse magnetic field. In all these cases authors have studied only the trivial state responses of the system and parametric instability regions were determined. However, practically, most of the engineering structures exhibit nonlinear behavior which cannot be predicted from these analyses. Few authors’ viz., Kojima and Nagaya (1985), Lu et al. (1995), Shih et al. (1998), Liu and Chang (2005), and Pratiher and Dwivedy (2009) have studied the nonlinear response of the elastic beams subjected to alternating electromagnetic field. For a more detailed review on parametrically excited beam subjected to magnetic field one may refer authors earlier works of Pratiher and Dwivedy (2007, 2009). From these literatures it has been observed that no research has been carried out to find the frequency response for magnetoelastic cantilever beam with tip mass subjected to periodic axial load. Hence, in the present work an attempt has been made to obtain the frequency response curves for such systems. Here, the governing temporal equation of motion of the system has been obtained which contains nonlinear damping, linear and nonlinear parametric excitation terms, in addition to the geometric and inertial types of nonlinear terms. By neglecting the effect of periodically varying axial load, the present system is similar to that of Pratiher and Dwivedy (2009) and by neglecting the geometric and inertial nonlinear terms, the present equation of motion is similar to that of Lu et al....

    [...]

  • ...(2000), Chen and Yah (2001), Wu (2005), and Pratiher and Dwivedy (2007) studied beam-plate systems subjected to transverse magnetic field....

    [...]

  • ...(2000), Chen and Yah (2001), Wu (2005), and Pratiher and Dwivedy (2007) studied beam-plate systems subjected to transverse magnetic field. In all these cases authors have studied only the trivial state responses of the system and parametric instability regions were determined. However, practically, most of the engineering structures exhibit nonlinear behavior which cannot be predicted from these analyses. Few authors’ viz., Kojima and Nagaya (1985), Lu et al. (1995), Shih et al. (1998), Liu and Chang (2005), and Pratiher and Dwivedy (2009) have studied the nonlinear response of the elastic beams subjected to alternating electromagnetic field....

    [...]

Journal ArticleDOI
TL;DR: In this paper, the interactive behaviors among transverse magnetic fields, axial loads and external force of a magneto-elastic beam with general boundary conditions are investigated, where axial forces and transverse forces are assumed to be periodic with respect to time and two specified frequencies are applied to the whole system.
Abstract: In this study, the interactive behaviors among transverse magnetic fields, axial loads and external force of a magneto-elastic beam with general boundary conditions are investigated. The axial force and transverse magnetic force are assumed to be periodic with respect to time and two specified frequencies, one for axial force and the other for oscillating transverse magnetic field, are applied to the whole system. The equation of motion for the physical model is derived by using the Hamilton's principle and the vibration analysis is performed by employing the characteristic orthogonal polynomials as well as the Galerkin's method. The displacement of the beam with the effect of the magnetic force, axial force and spring force are determined from the modal equations by using the Runge–Kutta method. Based on the present study, we can conclude that the effect of the magnetic field not only reduces the deflection but also decreases the natural frequencies of the system, also it should be noted that the specified beam model can be adopted to simulate several structures in mechanical, civil and electronic engineering.

29 citations


"Nonlinear vibrations and frequency ..." refers methods in this paper

  • ...(1998) and Liu and Chang (2005). Here the approximate solution of this equation is obtained using the first-order method of multiple scales as given later....

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Journal ArticleDOI
TL;DR: In this paper, two frequencies of pulsating axial force and oscillating transverse magnetic field are applied to the system and the amplitude versus time and velocity versus amplitude diagrams for the first mode and the first two modes are determined.
Abstract: Transient vibrations of a simply supported beam are considered. Including axial force, magnetic force and magnetic couple, the equation of motion is derived by Hamilton's principle. The damping factor is also considered in this study. Two frequencies of pulsating axial force and oscillating transverse magnetic field are applied to the system. Using the Runge-Kutta method, the amplitude versus time and velocity versus amplitude diagrams for the first mode and the first two modes are determined.

28 citations