Modelling on vibration of skew plate with thickness and temperature variation

Bhardwaj, Reeta; Mani, Naveen

doi:10.21595/vp.2019.20544

Vibroengineering Procedia

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Published: 15 March 2019

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Modelling on vibration of skew plate with thickness and temperature variation

Reeta Bhardwaj¹

Naveen Mani²

¹Department of Mathematics, Amity University Haryana, Gurgaon, India

²Department of Mathematics, Sandip University, Nashik, Maharshtra, India

Corresponding Author:

Naveen Mani

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Abstract

The present model describes the vibrational analysis of skew (parallelogram) plate made up of non-homogeneous material with variable thickness and temperature on clamped edges. One dimensional thickness and two-dimensional temperature variation is taken into consideration. The non-homogeneity of the plate varies circular in one dimension. The governing differential equation of motion for vibration analysis is solved by using Rayleigh Ritz technique and time period is calculated for the combination of different variation of plate parameters. The obtained results are presented in tabular form.

1. Introduction

Non-homogeneous plate with variable thickness is widely used in structural applications because of their high strength, light weight, and having higher stiffness. Therefore, in order to make good structural applications, it is required to study vibration characteristics of such plates. Many researchers have been worked in this direction and applied various method to solve vibration problem.

Ritz variational method [1] is applied to solve vibration problems of skew plates on different edge conditions and natural frequencies, modes shape is obtained for side ratio and skew angle. Natural vibration of skew plates [2] is presented on eight edge conditions by using the new version of differential quadrature method (DQM). Vibrational analysis of several laminated composite doubly-curved shells, singly-curved shells and plates with variable thickness is analyzed using generalized differential quadrature (GDQ) method [3]. Differential quadrature method (DQM) is used to study the effects of thickness-to-length ratio, volume fraction index, temperature, geometrical shape, and the boundary conditions on the frequency parameters of the functionally graded (FG) quadrilateral plates [4]. The vibrational characteristics of the functionally graded (FG) quadrilateral microplates [5] are investigated by using modified strain gradient theory (MSGT) on different boundary conditions. Free vibration analysis of functionally graded (FG) rectangular plates [6] on simply supported and clamped edge conditions under temperature field is studied and natural frequencies are obtained by Ritz method. Vibrational analysis of two types of functionally graded material (FGM) sandwich plates [7] with nonlinear temperature variation along with thickness is presented by using finite element (layer wise) formulation. Vibration of skew plates [8] with large skew angle is studied by using moving least square Ritz (MLS-Ritz) method and the results are obtained for rhombic plates on various edge conditions. Free vibration analysis of thin laminated skew plates [9] on clamped edges is investigated by using finite strip transition matrix method. Free vibration of rectangular and skew multilayered plate [10] are presented by using variable-kinematic Ritz method on different boundary conditions and evaluated convergence and accuracy of method. The transverse vibrations of skew plates [11] with variable thickness on different combinations of boundary conditions is presented by using Rayleigh Ritz method. The finite strip method [12] is employed to study the free vibration of skew orthotropic plates, with two opposite edges simply supported and the other two edges are free. Vibrational of non-homogeneous skew plate [13] with varying thicknesses and temperature is analyzed by using Rayleigh Ritz technique. Natural frequency of skew plate [14] with variation in thickness and Poisson’s ratio is studied by using Rayleigh Ritz method. A model is analyzed to study the vibration of tapered skew plate [15] on clamped edges using Rayleigh Ritz method. Free vibrational analysis of non-homogeneous parallelogram plate [16] with two dimensional circular variations in thickness along with temperature is studied using classical plate theory (CPT). Vibrational analysis of tapered square plate [17] with linear variation in density and bi linear variation in temperature is described using Rayleigh Ritz technique. Effect of plate parameters on time period of rectangular plate is studied in [18] using Rayleigh Ritz technique.

In this study, we computed time period of skew plate on clamped edges under different variation of parameters and results are presented in tabular form.

2. Analysis

Consider a thin parallelogram plate made up of non-homogeneous material with skew angle $θ$ as shown in Fig. 1 referred to skew coordinates $ζ' = ζ - ψ t a n θ$ , $ψ' = ψ s e c θ .$

Fig. 1Skew plate with angle θ

The expression for maximum kinetic energy $T_{s}$ and strain energy $V_{s}$ in skew coordinates is:

1

T_{s} = \frac{1}{2} ω^{2} c o s θ \int ‍ \int ‍ ρ l Φ^{2} d ψ' d ζ',

2

V_{s} = \frac{1}{2 c o s^{3} θ} \int ‍ \int ‍ D_{1} [\begin{array}{l} {(\frac{\partial^{2} Φ}{\partial ζ^{' 2}})}^{2} - 4 s i n θ (\frac{\partial^{2} Φ}{\partial ζ^{' 2}}) (\frac{\partial^{2} Φ}{\partial ζ^{'} \partial ψ^{'}}) \\ + 2 (s i n^{2} θ + ν c o s^{2} θ) (\frac{\partial^{2} Φ}{\partial ζ^{' 2}}) (\frac{\partial^{2} Φ}{\partial ψ^{' 2}}) \\ + 2 (1 + s i n^{2} θ - ν c o s^{2} θ) {(\frac{\partial^{2} Φ}{\partial ζ^{'} \partial ψ^{'}})}^{2} \\ - 4 s i n θ (\frac{\partial^{2} Φ}{\partial ζ^{'} \partial ψ^{'}}) (\frac{\partial^{2} Φ}{\partial ψ^{' 2}}) + {(\frac{\partial^{2} Φ}{\partial ψ^{' 2}})}^{2} \end{array}] d ψ' d ζ',

where, $D_{1} = E l^{3} / 12 (1 - ν)$ is flexural rigidity, here $E$ , $l$ and $ν$ are Young’s modulus, thickness and Poisson’s ratio of the plate.

3. Construction of problem

Consider a parallelogram plate of length $a$ and breadth $b$ with linear variation in thickness and circular variation in density and Poisson’s ratio as:

3

l = l_{0} (1 + β \frac{ζ^{'}}{a}), ρ = ρ_{0} [1 - m_{1} (1 - \sqrt{1 - \frac{ζ^{' 2}}{a^{2}}})],

ν = ν_{0} [1 - m_{2} (1 - \sqrt{1 - \frac{ζ^{' 2}}{a^{2}}})],

where $β$ , (0 ≤ $β$ ≤ 1) is tapering parameter of the plate and $m_{1}$ , $m_{2}$ (0 ≤ $m_{1}$ , $m_{2}$ < 1) is non-homogeneity parameters.

The two-dimensional steady temperature variation is considered as:

4

τ = τ_{0} (1 - \frac{ζ'}{a}) (1 - \frac{ψ'}{b}),

where $τ$ and $τ_{0}$ are the temperature on the plate at any point and at the origin respectively. The temperature dependent modulus of elasticity is:

5

E = E_{0} (1 - γ τ),

where $E_{0}$ is the Young’s modulus at $τ =$ 0 and $γ$ is slope of variation.

Substituting Eq. (4) in Eq. (5) we get:

6

E = E_{0} [1 - α (1 - \frac{ζ'}{a}) (1 - \frac{ψ'}{b})],

where $α$ , $(0 \leq α < 1)$ is called thermal gradient. On using Eqs. (3) and (6), Eqs. (1) and (2), becomes:

7

T_{s} = \frac{1}{2} ω^{2} ρ_{0} l_{0} \int_{0}^{a} ‍ \int_{0}^{b} ‍ [(1 - m_{1} Λ) (1 + β \frac{ζ^{'}}{a})] Φ^{2} d ψ^{'} d ζ^{'},

8

\begin{array}{l} V_{s} = \frac{E_{0} l_{0}^{3}}{24 c o s^{4} θ} \int_{0}^{a} ‍ \int_{0}^{b} ‍ [\frac{\{1 - α (1 - \frac{ζ^{' 2}}{a^{2}}) (1 - \frac{ψ^{' 2}}{b^{2}})\} {(1 + β \frac{ζ'}{a})}^{3}}{[1 - ν_{0}^{2} {(1 - m_{2} Λ)}^{2}]}] \\ \cdot [\begin{array}{l} {(\frac{\partial^{2} Φ}{\partial ζ^{' 2}})}^{2} - 4 Υ s i n θ (\frac{\partial^{2} Φ}{\partial ζ^{' 2}}) (\frac{\partial^{2} Φ}{\partial ζ' \partial ψ'}) \\ + 2 Υ^{2} [s i n^{2} θ + ν_{0} (1 - m_{2} Λ) c o s^{2} θ] (\frac{\partial^{2} Φ}{\partial ζ^{' 2}}) (\frac{\partial^{2} Φ}{\partial ψ^{' 2}}) \\ + 2 Υ^{2} [1 + s i n^{2} θ - ν_{0} (1 - m_{2} Λ) c o s^{2} θ] {(\frac{\partial^{2} Φ}{\partial ζ' \partial ψ'})}^{2} \\ - 4 Υ^{3} s i n θ (\frac{\partial^{2} Φ}{\partial ζ^{'} \partial ψ^{'}}) (\frac{\partial^{2} Φ}{\partial ψ^{' 2}}) + Υ^{4} {(\frac{\partial^{2} Φ}{\partial ψ^{' 2}})}^{2} \end{array}] d ψ' d ζ', \end{array}

where $Λ = (1 - \sqrt{1 - \frac{ζ^{' 2}}{a^{2}}})$ and $Υ = \frac{a}{b}$ .

It is also considered that parallelogram plate is clamped along all the four edges. Therefore, boundary conditions are:

9

Φ = \frac{\partial Φ}{\partial ζ'} = 0, ζ^{'} = 0, a, Φ = \frac{\partial Φ}{\partial ψ^{'}} = 0, ψ' = 0, b .

The deflection function which satisfy Eq. (9) is represented by:

10

Φ (ζ', ψ') = [\begin{matrix} [{(\frac{ζ^{'}}{a})}^{2} {(\frac{ψ^{'}}{b})}^{2} {(1 - \frac{ζ^{'}}{a})}^{2} {(1 - \frac{ψ^{'}}{b})}^{2}] \\ [Ω_{1} + Ω_{2} (\frac{ζ'}{a}) (\frac{ψ'}{b}) (1 - \frac{ζ'}{a}) (1 - \frac{ψ'}{b})] \end{matrix}],

where $Ω_{1}$ and $Ω_{2}$ are arbitrary constants.

4. Solution of model for time period

Rayleigh Ritz technique (i.e., maximum strain energy $V_{s}$ must equal to maximum kinetic energy $T_{s}$ ) is applied to obtain solution of the model. Therefore, we must have:

11

δ (V_{s} - T_{s}) = 0 .

Using Eqs. (7) and (8), Eq. (11) becomes:

12

δ (V_{s}^{*} - λ^{2} T_{s}^{*}) = 0,

where:

\begin{array}{l} V_{s}^{*} = \frac{1}{c o s^{4} θ} \int_{0}^{a} ‍ \int_{0}^{b} ‍ [\frac{\{1 - α (1 - \frac{ζ^{' 2}}{a^{2}}) (1 - \frac{ψ^{' 2}}{b^{2}})\} {(1 + β \frac{ζ^{'}}{a})}^{3}}{[1 - ν_{0}^{2} {(1 - m_{2} Λ)}^{2}]}] \\ \cdot [\begin{array}{l} {(\frac{\partial^{2} Φ}{\partial ζ^{' 2}})}^{2} - 4 Υ s i n θ (\frac{\partial^{2} Φ}{\partial ζ^{' 2}}) (\frac{\partial^{2} Φ}{\partial ζ^{'} \partial ψ^{'}}) \\ + 2 Υ^{2} [s i n^{2} θ + ν_{0} (1 - m_{2} Λ) c o s^{2} θ] (\frac{\partial^{2} Φ}{\partial ζ^{' 2}}) (\frac{\partial^{2} Φ}{\partial ψ^{' 2}}) \\ + 2 Υ^{2} [1 + s i n^{2} θ - ν_{0} (1 - m_{2} Λ) c o s^{2} θ] {(\frac{\partial^{2} Φ}{\partial ζ^{'} \partial ψ^{'}})}^{2} \\ - 4 Υ^{3} s i n θ (\frac{\partial^{2} Φ}{\partial ζ^{'} \partial ψ^{'}}) (\frac{\partial^{2} Φ}{\partial ψ^{' 2}}) + Υ^{4} {(\frac{\partial^{2} Φ}{\partial ψ^{' 2}})}^{2} \end{array}] d ψ^{'} d ζ^{'}, \end{array}

T_{s}^{*} = \int_{0}^{a} ‍ \int_{0}^{b} ‍ [(1 - m_{1} Λ) (1 + β \frac{ζ'}{a})] Φ^{2} d ψ' d ζ' .

here $λ^{2} = 12 ρ_{0} ω^{2} a^{4} / E_{0} l_{0}^{2}$ is frequency parameter. Eq. (12) consists of two unknown constants $Ω_{1}$ and $Ω_{2}$ . These two unknowns could be calculated as:

13

\frac{\partial}{\partial Ω_{n}} (V_{s}^{*} - λ^{2} T_{s}^{*}) = 0, n = 1,2 .

After simplifying Eq. (13) we get:

14

r_{n 1} Ω_{1} + r_{n 2} Ω_{2} = 0, n = 1,2 .

To obtain frequency equation, the determinant of coefficient matrix of Eq. (14) must zero:

15

|\begin{array}{l} r_{11} & r_{12} \\ r_{21} & r_{22} \end{array}| = 0,

where coefficients $r_{11}$ , $r_{12} = r_{21}$ , $r_{22}$ comprises plate parameters and frequency parameter $(λ)$ .

Time period of vibration is calculated as:

K = \frac{2 π}{λ},

where $λ$ is frequency obtained from Eq. (15).

5. Results and discussion

Time period (in seconds) for vibrational frequency of non-homogeneous and non-uniform parallelogram plate is calculated on different variation of plate parameters (taper constant $β$ , thermal gradient $α$ , non-homogeneity constants $m_{1}$ , $m_{2}$ and skew angle $θ$ ) and presented with the help of tables.

Time period for three different values of thermal gradient $α$ and non homogeneity constants $m_{1}$ , $m_{2}$ i.e., $α = m_{1} = m_{2} =$ 0.2,0.4,0.6 is presented in Table 1, corresponding to taper constant $β$ . Table 1 conclude that increasing in taper constant $β$ results the decreasing in time period for all the three cases mentioned in Table 1. On the other aspect, increasing in combined value of thermal gradient $α$ and non-homogeneity constants $m_{1}$ , $m_{2}$ results the increasing in time period.

Time period for three different value of taper constant $β$ and non homogeneity constants $m_{1}$ , $m_{2}$ i.e., $β = m_{1} = m_{2} =$ 0.2,0.4,0.6 tabulated in Table 2 with respect to thermal gradient $α$ . Here, increasing in thermal gradient $α$ implies the increasing in time period and increasing in combined value of taper constant $β$ and non homogeneity constants $m_{1}$ , $m_{2}$ results the decreasing in time period.

Table 1Time period K[s] vs taper constant β for θ=45°, a/b= 1.5

$β$	$α = m_{1} = m_{2} =$ 0.2		$α = m_{1} = m_{2} =$ 0.4		$α = m_{1} = m_{2} =$ 0.6
$β$	$K_{1}$	$K_{2}$	$K_{1}$	$K_{2}$	$K_{1}$	$K_{2}$
0.0	0.013660	0.053844	0.014189	0.055826	0.014746	0.057922
0.2	0.012400	0.048836	0.012875	0.050595	0.013374	0.052443
0.4	0.011330	0.044576	0.011761	0.046147	0.012212	0.047796
0.6	0.010415	0.040932	0.010809	0.042352	0.011220	0.043835
0.8	0.009628	0.037793	0.009989	0.039085	0.010367	0.040432
1.0	0.008945	0.035073	0.009279	0.036257	0.009627	0.037489

Table 2Time period K[s] vs thermal gradient α for θ= 45°, a/b= 1.5

$α$	$β = m_{1} = m_{2} =$ 0.2		$β = m_{1} = m_{2} =$ 0.4		$β = m_{1} = m_{2} =$ 0.6
$α$	$K_{1}$	$K_{2}$	$K_{1}$	$K_{2}$	$K_{1}$	$K_{2}$
0.0	0.012103	0.047671	0.011202	0.043976	0.010424	0.040772
0.2	0.012400	0.048836	0.011471	0.045022	0.010670	0.041720
0.4	0.012719	0.050093	0.011761	0.046147	0.010935	0.042738
0.6	0.013065	0.051450	0.012073	0.047363	0.011220	0.043835
0.8	0.013440	0.052993	0.012412	0.048679	0.011529	0.045019

Time period for three different value of thermal gradient $α$ and tapering constant $β$ i.e., $α = β =$ 0.2,0.4,0.6 is tabulated in Table 3 corresponding to simultaneous variation in non-homogeneity constants $m_{1}$ , $m_{2}$ . Here also increasing in non-homogeneity constants $m_{1}$ , $m_{2}$ results the increase in time period for all the three value of thermal gradient $α$ and tapering constant $β$ but wih less rate of increment. Also increasing in combined value of thermal gradient $α$ and tapering constant $β$ results the decrease in the time period.

Time period for three different values of thermal gradient $α$ , taper constant $β$ and non-homogeneity constants $m_{1}$ , $m_{2}$ i.e., $α = β = m_{1} = m_{2} =$ 0.2,0.4,0.6 is accommodated in Table 4 corresponding to skew angle $θ$ . Increasing in skew angle as well as in the combined value of thermal gradient $α$ , taper constant $β$ and non-homogeneity constants $m_{1}$ , $m_{2}$ , results the decrease in time period. The rate of decrement with increasing value of skew angle $θ$ is very high in comparison to rate of decrement with the combined increasing value of other plate parameters.

Table 3Time period K[s] vs non-homogeneity m1, m2 for θ= 45°,a/b= 1.5

$m_{1}$ , $m_{2}$	$α = β =$ 0.2		$α = β =$ 0.4		$α = β =$ 0.6
$m_{1}$ , $m_{2}$	$K_{1}$	$K_{2}$	$K_{1}$	$K_{2}$	$K_{1}$	$K_{2}$
0.0	0.012238	0.048318	0.011463	0.045208	0.010808	0.042559
0.2	0.012400	0.048839	0.011616	0.045691	0.010954	0.043015
0.4	0.012552	0.049329	0.011761	0.046150	0.011091	0.043439
0.6	0.012696	0.049791	0.011897	0.046577	0.011220	0.043835
0.8	0.012832	0.050222	0.012024	0.046970	0.011340	0.044199

Table 4Time period K[s] vs skew angle θ for a/b= 1.5

$θ$	$α = β = m_{1} = m_{2} =$ 0.4		$α = β = m_{1} = m_{2} =$ 0.4		$α = β = m_{1} = m_{2} =$ 0.6
$θ$	$K_{1}$	$K_{2}$	$K_{1}$	$K_{2}$	$K_{1}$	$K_{2}$
0	0.025592	0.102547	0.024292	0.097031	0.023189	0.092310
15	0.023771	0.095011	0.022559	0.089878	0.021533	0.085483
30	0.018887	0.074999	0.017919	0.070912	0.017101	0.067406
45	0.012400	0.048836	0.011761	0.046147	0.011220	0.043835
60	0.006108	0.023881	0.005791	0.022555	0.005524	0.021409

6. Conclusions

Present model provides time period of parallelogram plate on different variation of plate parameters. From the results discussion, we conclude that increasing in taper constant $β$ and skew angle $θ$ , results the decrease in time period as shown in Tables 1 and Table 4. But increasing in thermal gradient $α$ and non-homogeneity constants (simultaneous variation) $m_{1}$ , $m_{2}$ , results the increase in time period as shown in Tables 2 and Table 3. The present model provides a good appropriate data for time period of frequency which will be helpful for structural design.

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About this article

Received

14 January 2019

Accepted

26 January 2019

Published

15 March 2019

SUBJECTS

Mechanical vibrations and applications

DOI

https://doi.org/10.21595/vp.2019.20544

Keywords

vibration

linear variation

circular variation

thickness

This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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R. Bhardwaj and N. Mani, “Modelling on vibration of skew plate with thickness and temperature variation,” Vibroengineering PROCEDIA, Vol. 22, pp. 6–12, Mar. 2019, https://doi.org/10.21595/vp.2019.20544

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TY  - JOUR
DO  - 10.21595/vp.2019.20544
UR  - https://doi.org/10.21595/vp.2019.20544
TI  - Modelling on vibration of skew plate with thickness and temperature variation
T2  - Vibroengineering PROCEDIA
AU  - Mani, Naveen
AU  - Bhardwaj, Reeta
PY  - 2019
DA  - 2019/03/15
PB  - JVE International Ltd.
SP  - 6-12
VL  - 22
SN  - 2345-0533
SN  - 2538-8479
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@article{Mani_2019,
	doi = {10.21595/vp.2019.20544},
	url = {https://doi.org/10.21595/vp.2019.20544},
	year = 2019,
	month = {mar},
	publisher = {{JVE} International Ltd.},
	volume = {22},
	pages = {6--12},
	author = {Naveen Mani and Reeta Bhardwaj},
	title = {Modelling on vibration of skew plate with thickness and temperature variation},
	journal = {Vibroengineering {PROCEDIA}}
}

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[1]N. Mani and R. Bhardwaj, “Modelling on vibration of skew plate with thickness and temperature variation,” Vibroengineering PROCEDIA, vol. 22, pp. 6–12, Mar. 2019, doi: 10.21595/vp.2019.20544.

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Mani, Naveen, and Reeta Bhardwaj. “Modelling on Vibration of Skew Plate with Thickness and Temperature Variation.” Vibroengineering PROCEDIA 22 (March 15, 2019): 6–12. https://doi.org/10.21595/vp.2019.20544.

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Modelling on vibration of skew plate with thickness and temperature variation

Abstract

1. Introduction

2. Analysis

3. Construction of problem

4. Solution of model for time period

5. Results and discussion

6. Conclusions

References

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