Abstract
In this work, forced vibration analysis of isotropic thin circular plate resting on nonlinear viscoelastic foundation is investigated. The dynamic analogue of the Von Kármán equations is used to establish the governing equations. The system coupled nonlinear partial differential equations are transformed to system of nonlinear ordinary differential equation using Galerkin decomposition method. Consequently, the analytical solutions are provided using differential transformation method with Padè Laplace after treatment technique. The developed solutions are verified using the existing results in the literature, and good agreement is observed. Subsequently, the analytical solutions are used to investigate the effects of various parameters on the dynamic response of the plate. From the results, it is observed that nonlinear frequency ratio of vibrating circular plate increases with increased linear elastic foundation and tensile force. Nevertheless, it is established that the nonlinear frequency ratio of the plate decreases as nonlinear Winkler foundation and compressive force increase. Also, the results revealed that clamped edge and simply supported edge condition recorded the same softening nonlinearity. However, axisymmetric case of vibration gives lower nonlinear frequency ratio compared to symmetric case. Also, maximum deflection occurs when excitation force is zero; likewise attenuation deflection is observed due to the presence of viscoelastic foundation. It is expected that the findings from this research will enhance the design of structures subjected to vibration under where circular plates are used.
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1 Introduction
The dynamic behaviours of circular plates have been a subject of great research interest for the past few decades. In such research, it has been shown that thin circular plates may exhibit a flexural vibration, having the same order as the thickness of the plate. In that case, linear model is not sufficient enough to predict the dynamic behaviour of the circular plates because physical scenario such as resonance, jump phenomenon and hysteresis are often encountered (Nayfeh and Mook 1979). In order to describe the vibration of the structure under such condition, Von Kármán equation is used to include the geometric nonlinearities in the vibration governing equation, taking cognisance of the stretching of the midplane. One of such studies was presented by Dumir (1986) where the dynamic behaviour of circular plates resting on elastic foundation was analysed using a semi-analytical method. The author made consideration to plates with edges restrained against rotation and in-plane displacement using Von Kármán principle. Touzé et al. (2002) studied asymmetric nonlinear vibrations of free-edge circular plates using multiple scales method with introduction of slight imperfections into the plate. The authors focused on the scenario where one configuration that is not directly excited by the load obtains energy via nonlinear coupling with other configurations. Von Kármán equations are considered in the modelling of the governing equation. Subsequently, Dai et al. (2011) investigated nonlinear plates vibration based on Von Kármán principle using Galerkin method resulting in tangential stiffness matrix. In another study, Xie and Xu (2013) determined general solution for nonlinear oscillations based on Von Kármán’s theory along with quasi-steady aerodynamic theory in establishing the governing equation. In a later work, Dai et al. (2014) re-examined deflection of Von Kármán plate with imperfect initial deflection using semi-analytical method.
Foundations are important parts of systems owing to the preponderant application in engineering. The role of foundation in protecting structural system under vibration from failure cannot be underestimated. Part of the aims of the authors is to investigate the dynamic behaviour of viscoelastic nonlinear foundation on a thin vibrating isotropic circular plate. Zhu et al. (2015) examined the nonlinear viscoelastic foundation model as a three-parameter model, meaning the layers are indicated by linear elastic springs, cubic nonlinearity elastic springs and shear deformation. The investigation of dynamic response of beam resting on elastic foundation was performed by Yankelevsky et al. (1989), based on the findings nonlinear model is more practical and more realistic than linear model. In another study, Wu and Thompson (2004) conducted a research on the effect of linearity and nonlinearity on the wheel–rail impact. It was concluded that the linear model is not suitable for wheel–rail impact problem. In a similar work, Senalp et al. (2010) investigated the effects of speed and damping of load on nonlinear dynamic response of beams resting on nonlinear foundation. Also, Civalek (2013) based on his study stated that the influence of nonlinear and shear parameters on the amplitude of oscillations is vastly significant compared to the linear model. In a further study, Kanani et al. (2014) examined the influence of nonlinear foundation on large amplitude of a beam. The foundation was modelled to include shear layer of Pasternak and nonlinear Winkler foundations. The authors realized that increasing the nonlinear parameter of the foundation can augment the system nonlinearity. Meanwhile, shear and linear parameters can weaken the nonlinearity. Since the nonlinearity of the system is affected by the above-mentioned parameters, the system nonlinearity can be controlled by linear and shear. Younesian et al. (2019) reviewed elastic and viscoelastic foundations on linear and nonlinear model. Based on the authors’ finding, there are limitations in the use of elastic foundation compared to adoption of viscoelastic element. Other studies on related field are reported by Haciyev et al. (2019), Sofiyev et al. (2017), Lin and Dangal (2017), Lin et al. (2018) and Linlin and Xing (2019).
Various analytical studies in the previous work have shown that analysis of nonlinear models is very difficult to handle using exact method, and recourse is made to semi-analytical and numerical method. In an attempt to obtain numerical solution for structure on nonlinear foundation, Allahverdizadeh et al. (2008) employed Kantorovich averaging method to analyse nonlinear free and forced vibration of functionally graded plates. However, for semi-analytical solutions, El Kaak et al. (2016) studied geometrical nonlinearity of free axisymmetric vibrations of functionally graded circular plate using iterative and explicit semi-analytical solution. In another work, Yazdi (2016) assessed the use of homotopy perturbation method on forced vibration of orthotropic circular plate on elastic nonlinear foundation. The effect of elastic foundation parameter was considered. According to the findings, the influence of Winkler and Pasternak foundation on the frequency ratio is much significant. Also, Togun and Bagdatl (2016) examined the free and forced vibration of nanobeam resting on Winkler and Pasternak foundation using Perturbation series. In a further work, Sobamowo (2017) used differential transformation method (DTM) to analysis carbon nanotube resting on Pasternak foundation. DTM is adopted as the method of solution for this study based on the fact that the method is a closed form series solution with fast convergence coupled with being easier to use and reduction of computational cost compared to other methods of solutions like numerical method with huge volume of calculation and convergence study limitation. More so, for perturbation method, the need for small parameter is also a limitation. Likewise, the restriction of HPM to weakly nonlinear and lack of proper guideline on choice of initial approximation in iterative method are some of the difficulties DTM overcome.
Various studies are presented in the literature including axisymmetric vibration of circular plate resting on elastic foundation, meanwhile investigation on the symmetric vibration on viscoelastic three-parameter medium is still limited. Therefore, this study examines forced vibration of symmetric and axisymmetric circular plate resting on viscoelastic three foundation parameters. Most of the above works are mainly related with the amplitude–frequency response of the circular plates. However, damping and forcing effect included studies on the nonlinear vibration properties of plate systems are also rather limited. The damping effects are considered, and nonlinear vibration behaviours of the circular plates are illustrated. Practical application of problem includes liquid storage tanks, pipelines and slab track for floating railway track to mention a few.
2 Problem Formulation and Mathematical Analysis
Considering a circular plate as shown in Fig. 1, the plate is considered resting on Pasternak and Winkler foundations under simply supported and clamped edge conditions. Von Kármán’s deflection theory by Touzé et al. (2002) is considered in the modelling of the governing equation based on the following assumptions:
-
(1)
Thin plate is assumed.
-
(2)
Kirchhoff–Love hypotheses are assumed to be satisfied.
-
(3)
Only the nonlinear terms of lowest order are kept in the expression of the strains as functions of the displacement.
-
(4)
The in-plane and rotatory inertia terms are neglected.
The governing differential equations as reported by Kerr (1964), Dumir (1986) and Yamaki (1961) are
where \(t\) is the time, \(r\) is the radial coordinate, \(w^{*}\) is the transverse deflection, \(E\) is the Young’s modulus of the plate. The foundation of the circular plate is visco-Pasternak medium, \(k_{{\text{w}}}\) is the Winkler foundation, \(k_{{\text{s}}}\) is the Pasternak foundation, \(k_{{\text{p}}}\) is the nonlinear Winkler, \(q\) is the uniformly distributed transverse load, \(\omega\) is the excitation frequency, c is the damper modulus parameters, while \(\rho\) is the material density, \(h\) is the thickness of the plate, flexural rigidity \(D = Eh^{3} /12(1 - \nu^{2} )\), \(F\) is the Airy stress function, \(\nabla\) is the Laplacian and Poisson’s ratio is \(\nu\).
The transverse deflection of the plate is assumed to be
\(w^{*}\) is the vertical displacement at a given point of coordinates with respect to spatial coordinate and time of the middle surface of the plate.
Using dimensionless parameters
we arrived at the following equations
where
2.1 Boundary Condition
The following boundary conditions are used (Figs. 2, 3):
-
Clamped edge condition
$$\begin{aligned} & \left. W \right|_{R = 1} = 0,\left. {\frac{\partial W}{{\partial R}}} \right|_{R = 1} = 0, \\ & \left. W \right|_{R = 0} = 0,\left. {\frac{\partial W}{{\partial R}}} \right|_{R = 0} = 0, \\ \end{aligned}$$(6) -
Simply Supported edge condition
$$\begin{aligned} & \left. W \right|_{R = 1} = 0,\left. {\left( {\frac{{\partial^{2} W}}{{\partial R^{2} }} + \frac{\nu }{R}\frac{\partial W}{{\partial R}}} \right)} \right|_{R = 1} = 0, \\ & \left. W \right|_{R = 0} = 0,\left. {\left( {\frac{{\partial^{2} W}}{{\partial R^{2} }} + \frac{\nu }{R}\frac{\partial W}{{\partial R}}} \right)} \right|_{R = 0} = 0, \\ \end{aligned}$$(7) -
The initial conditions:
$$\left. W \right|_{\tau = 0} = T_{o} ;\quad \left. {\frac{\partial W}{{\partial \tau }}} \right|_{\tau = 0} = 0,$$(8)
For the Airy stress functions, free edge and constrained immovable edge are considered. The boundary conditions in dimensionless form are
3 Method of Solution: Differential Transformation Method
3.1 Principle of Differential Transformation Method
Differential transformation method (DTM) proposed by Zhao (1986) is a closed form series approximate solution, very powerful, reliable and easy to comprehend semi-analytical method for solving linear, nonlinear, partial and ordinary differential equations. DTM involves transformation techniques which are applied to the governing equation along with the governing boundary conditions to form algebraic equations. The resulting solution of the algebraic equations form the solution of the system in series form. The accuracy of the results compared to numerical method and experimental is very high. The basic definitions and operational properties are as follows:
Considering a function \(\varphi (t)\) that is analytic in the domain \(t\), the function \(\varphi (t)\) will be differentiated continuously with rest to space \(t\)
For \(t = t_{i}\), then \(\phi \left( {t,k} \right) = \phi \left( {t_{i} ,k} \right)\), where \(k\) belongs to the set of nonnegative integers, denoted as the \(k{\text{-domain}}\). Therefore, Eq. (10) is written as
where \(\vartheta_{k}\) is the spectrum of \(\varphi \left( t \right)\) at \(t = t_{i}\).
\(\varphi \left( t \right)\) is expressed in Taylor’s series, then \(\varphi \left( t \right)\) is presented as
Equation (12) is the inverse of \(\vartheta (k)\) transverse deflection using the symbol “\(D\)” representing the differential transform process, and combining Eqs. (11) and (12), we have (Table 1)
3.2 Transformation of the Governing Equation to Ordinary Differential Equation
An approximate solution is obtained by assuming the nonlinear free vibrations to have the same spatial shape, i.e.
Substituting Eqs. (14) into (4) and solving the ordinary differential equation (ODE) provides
The value of \(F\) is accordingly found to be finite at the origin \(c_{1} = 0\). Additionally, \(c_{3}\) is the constant of integration to be determined from in-plane boundary conditions.
The substitution of the expressions for \(w\) and \(F\) given by Eqs. (14) and (15), respectively, into Eq. (3), also with application of the Galerkin procedure in the nonlinear time differential equation obtained in the form
We reached
where
The initial and boundary conditions are
For a plate with an elastically restrained outer edge, with rotational and in-plane stiffnesses \(k_{{\text{b}}}^{*}\) and \(k_{{\text{i}}}^{*}\), subjected to an applied in-plane radial force resultant \(N^{*}\) at the outer edge, the boundary conditions are
where \(u^{*}\) is the radial displacement at midplane. Introduce dimensionless parameters \(k_{b} ,k_{i}\) and \(N\)
The dimensionless boundary conditions are
Equations (25) and (26) are used to find the constants \(c_{2}\) and \(c_{4}\) while the constant of integration \(c_{3}\) is obtained using Eq. (27). The constants values under simply supported conditions are
while for Clamped edge condition they are
3.3 Determination of Nonlinear Natural Frequency Ratio
The dynamic response of the structural analysis is carried out under the transformation
Applying Eqs. (31) on (17), we have
\(G = 0\) for undamped condition
In order to find the periodic solution of Eq. (33), assume an initial approximation for zero-order deformation as
Substituting Eqs. (34) into (33) gives
which gives
collect like term
eliminating the secular term, one arrives at
Thus, zero-order nonlinear natural frequency becomes
Therefore, ratio of zero-order nonlinear natural frequency\(\omega_{0}\) to the linear frequency \(\omega_{b}\)
Following the same procedural approach, the first-order nonlinear natural frequency is
The ratio of the first-order nonlinear frequency\(\omega_{1}\) to the linear frequency \(\omega_{b}\) gives,
Primary resonance of damped Duffing system is given as
where the frequency ratio is represented by \(\frac{\Omega }{{\omega_{0} }}\), where \(\varsigma\) is the damping coefficient, \(\Omega\) is excited frequency \(k\), \(\varepsilon\) and \(Q\) are constants, \(A\) is the amplitude of vibration, and \(\omega_{0}\) is the natural frequency of the underlying linear system.
3.4 Modified Differential Transform Method Procedure
The small domain limitation of semi-analytical method has been overcome by the introduction of after treatment method in power series method. Laplace–Padè approximant has proven to be very reliable approach that also increases the convergence rate of the iteration. The Padè is a form of converting the analytical solution obtained through DTM method to polynomial rational form. The basic procedure are as follows:
-
1.
$${\text{Apply}}\;{\text{Laplace}}\;{\text{transform}}\;{\text{to}}\;{\text{the}}\;{\text{series}}\;{\text{solution}}\;{\text{and}}\;{\text{setting}}\;s = \frac{1}{t}.$$(44)
-
2.
Apply Padè approximation to the solution from previous step to obtain the following approximation in the following rational form:
$$\left[ \frac{L}{M} \right] = \frac{{P_{0} + P_{1} t + P_{2} t^{2} + \cdots P_{L} t^{L} }}{{q_{0} + q_{1} t + q_{2} t^{2} + \cdots q_{M} t^{M} }}\quad {\text{and}}\,{\text{setting}}\,t = \frac{1}{s}.$$(45) -
3.
$${\text{Apply}}\;{\text{inverse}}\;{\text{Laplace}}\;{\text{transform}}\;{\text{on}}\;\left[ \frac{L}{M} \right]\;{\text{approximant}}{.}$$(46)
3.5 Application of Differential Transformation Method to the Duffing Equation
Applying DTM to the Duffing oscillation Eq. (17), along with the initial condition Eq. (8), we get
Initial condition are
3.5.1 The Solution Procedure
For \(k\) from 0, 1, 2, 3, 4, 5, 6, 7, we have the following:
Using the definition of DTM, solution of Eq. (18) is given as
Substituting the values obtained for \(K,M,V\) from Eqs. (18)–(20) into Eq. (53), we have
The accuracy of the DTM is improved using the principle of Modified differential transform method (MDTM). Apply Laplace transform to the series solution Eq. (54) as
Also, replacing \(s = \frac{1}{t}\) and calculating Padè approximant of \(\left[ \frac{5}{6} \right]\) and letting \(t = \frac{1}{s}\) gives the following,
Applying the inverse Laplace transform to the Padè approximant of Eq. (56), the MDTM solution is
4 Results and Discussion
The problem titled forced vibration analysis of isotropic circular plate resting on viscoelastic foundation is analysed and presented here. The accuracy and reliability of the presented analytical solution are established and validated with results presented in the cited literature Haterbouch and Benamar (2003). The validations are displayed in Table 3 and confirmed in good harmony with maximum 5% difference. Two cases were considered, when the number of nodal diameter \(m = 0\) (symmetric case, even number) and while \(m = 1\) (axisymmetric case, odd numbers). The physical properties of the material used for the analysis are as follows:
Young's modulus = 210.0 GPa, Poisson's ratio = 0.3, and mass density = 7850 kg/m3 and plate thickness of 3 mm. The amplitude of vibration considered is \(Q_{o} = 0.1\).
4.1 Convergence Criteria
The convergence criteria are illustrated along with the computational time in Table 2. It is shown that the iteration converges at n = 4; therefore, extending the iterations beyond n = 4 only further increases the computational time without substantial difference in the solution (Table 3).
4.2 Effect of Foundation Parameters
The variation of the amplitude with nonlinear frequency ratio is shown in Figs. 4, 5, 6 and 7. The frequencies are obtained taking into consideration the physical geometry properties of the plate and also taking into consideration non-dimensional analysis. Invariably, the results are effective for any thickness-to-radius ratios. It is shown in Fig. 4 that increase in the value of the nonlinear Winkler foundation parameter results in a reduction in the frequency ratio. This is a case of softening nonlinearity properties.
In Figs. 5, 6 and 7, the nonlinear frequency against the amplitude curve of the isotropic circular plate is shown for linear foundation parameter variation. From the results, it is observed that nonlinear frequency of the circular plate increases with the increase in elastic linear foundation parameters. The Pasternak parameter has a pronounced effect on the nonlinear frequency amplitude curve of the circular plate. The values of nonlinear frequency has a direct relationship with the Winkler and Pasternak values. The parameters can be used to control the nonlinearity of structures. Same scenario is observed for symmetric and axisymmetric cases likewise under the two boundary conditions considered.
4.3 Effect of Radial Force
Figures 8 and 9 show the influence of outer edge radial force consequent on nonlinear frequency ratio. Figure 8 illustrates the results obtained for tensile force, while Fig 9 depicts that of compressive force. It is observed clearly from the figures that nonlinear frequency ratio increases for tensile force with an increase in the value of N, while the contrary is observed for compressive force. The effect of a compressive force is more pronounced than that of a tensile force. This is attributed to the fact that variation of radial force N may affect the stiffness of the isotropic circular plate.
4.4 Effect of Viscoelastic Foundation
The influence of the viscoelastic foundation is presented in Figs. 10 and 11. As the viscoelastic parameter increases, the deflection on the plate decreases. The excitation of the vibration decays with time due to the presence of damper. Attenuation of the deflection of the circular plate is observed meaning that damages in the system can be reduced with the presence of viscoelastic foundation.
Figure 12 shows the comparison of linear with nonlinear vibration of the isotropic circular plate, and it is observed that the difference is more significant with an increase in value of maximum vibration of the structure, while Fig. 13 shows the relationship between results obtained with DTM and MDTM. The advantage of MDTM is illustrated by extending the domain of the results.
4.5 Effect of Symmetric and Antisymmetric Cases
To illustrate the study of symmetric and axisymmetric case considered. Results obtained from the analysis are shown graphically in Fig. 14. From the result, axisymmetric case is shown to possess better results than the symmetric case. The frequency ratio is lower for axisymmetric case compared to symmetric case due to higher stiffness possessed by axisymmetric case. This shows that spatial property of the circular plate has an impact on vibration of the circular plate.
4.6 Primary Resonance Response
Figure 15 shows the primary resonance response of the isotropic circular plate. From the results, it is observed that vibration amplitude is lower than the thickness of the plate meaning that the result is reliable. It is also inferred from the figure that the nonlinear frequency is a function of amplitude. Increasing the forcing term increases function amplitude of vibration.
4.7 Effect of Boundary Condition
Figures 16 and 17 depict the effect of boundary conditions on the nonlinear amplitude frequency response curve of the isotropic circular plate. From the results, case of softening nonlinearity is observed.
5 Conclusions
In this study, the forced vibration analysis of isotropic circular plate resting on nonlinear viscoelastic foundation is investigated. The governing coupled partial differential equation is transformed into nonlinear ordinary differential equation using Galerkin decomposition method. The ODE is solved analytically using DTM with Padè Laplace approximant technique. Symmetric and axisymmetric cases are considered. The results obtained are verified with results published in the cited literature, and good harmony is observed. The developed analytical solutions are used to investigate the effect of elastic foundations, radial force, damper and varying amplitude on the dynamic behaviour of the isotropic circular plate. Based on the parametric studies, the following were observed.
-
1.
Nonlinear Winkler foundation parameter results in reduction in the frequency ratio, while nonlinear frequency ratio increases with increase linear elastic foundation. Pasternak parameter has a pronounced effect on the nonlinear frequency
-
2.
Nonlinear frequency ratio increases for tensile force, whereas contrariwise is observed for compressive force. The effect of compressive force is more pronounced than that of tensile force.
-
3.
The deflection of the circular plate decreases as the viscoelastic foundation parameters increases.
-
4.
For primary resonance obtained, vibration amplitude is lower than the thickness of the plate and maximum amplitude occurs at \(Q = 0\).
-
5.
Axisymmetric case of vibration gives lower frequency ratio compared to symmetric case.
-
6.
Same softening nonlinearity is observed for both simply supported and clamped edge condition.
The present study reveals major elements controlling the nonlinearity of vibrating thin circular plate under external force. Also, the versality of DTM with Padè-approximant technique has been demonstrated. It is hoped that the present study will improve understanding in theory of vibration of circular plate.
Abbreviations
- h :
-
Plate thickness
- ρ :
-
Mass density
- D :
-
Flexural rigidity of isotropic plate
- Ω:
-
Dimensionless natural frequency
- ν :
-
Poisson’s ratio of isotropic plate
- a, b :
-
Dimension of the plate
- \(\frac{{\text{d}}}{{{\text{d}}r}}\) :
-
First-order differential operator with respect to x
- w :
-
Transverse deflection
- x, y :
-
Rectangular space Cartesian coordinate along the length of thin plate
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The authors acknowledge the support of university of Lagos for providing the material support for the research.
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We appreciate the support of the Herzer Research Group, University of Lagos, Nigeria.
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SA analysed and interpreted the data required for this research; he also put up the manuscript while MG’s contribution was a major one in the writing of the manuscript. All authors read and approved the final manuscript.
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Salawu, S.A., Sobamowo, G.M. & Sadiq, O.M. Forced Vibration Analysis of Isotropic Thin Circular Plate Resting on Nonlinear Viscoelastic Foundation. Iran J Sci Technol Trans Civ Eng 44 (Suppl 1), 277–288 (2020). https://doi.org/10.1007/s40996-020-00368-y
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DOI: https://doi.org/10.1007/s40996-020-00368-y