This document presents research on the vibration characteristics of a non-homogeneous visco-elastic square plate with variations in thickness and temperature. A mathematical model is developed to analyze the effects of thermal gradients and taper parameters on the fundamental frequencies of the plate. The frequencies of the first two vibration modes are calculated for different values of the parameters using MATLAB. The results show that the frequencies decrease with increasing thermal gradient but increase with rising taper constants. The study aims to provide engineers and researchers a theoretical model to analyze thermally induced vibrations in non-homogeneous plates.
The International Institute for Science, Technology and Education (IISTE) , International JoThe International Institute for Science, Technology and Education (IISTE) , International Journals Call for papaers: http://www.iiste.org/Journalsurnals Call for papaers: http://www.iiste.org/Journals
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IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
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The proposed numerical method employs a special interface parameterization that enables the use of an efficient implicit time-integration method via a small-scale decomposition. This approach allows one to capture the nonlinear growth of normal modes for the case of Rayleigh-Taylor instability with the heavier fluid on top.
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UiPath Test Automation using UiPath Test Suite series, part 3
11.vibration characteristics of non homogeneous visco-elastic square plate
1. Advances in Physics Theories and Applications www.iiste.org
ISSN 2224-719X (Paper) ISSN 2225-0638 (Online)
Vol 2, 2011
Vibration Characteristics of Non-Homogeneous Visco-
Elastic Square Plate
Anupam Khanna1* Ashish Kumar Sharma1
1
Dept. Of Mathematics, M.M.Engg. College., M.M.University (Mullana), Ambala, Haryana, India
*rajieanupam@gmail.com
The research is financed by Asian Development Bank. No. 2006-A171(Sponsoring information)
Abstract
A mathematical model is presented for the use of engineers, technocrats and research workers in space
technology, mechanical Sciences have to operate under elevated temperatures. Two dimensional
thermal effects on frequency of free vibrations of a visco-elastic square plate is considered. In this
paper, the thickness varies parabolic in X- direction and thermal effect is vary linearly in one direction
and parabolic in another direction. Rayleigh Ritz method is used to evaluate the fundamental
frequencies. Both the modes of the frequency are calculated by the latest computational technique,
MATLAB, for the various values of taper parameters and temperature gradient.
Keywords: visco-elastic, Square plate, vibration, Thermal gradient, Taper constant, non-homogeneous.
1 Introduction
In the engineering we cannot move without considering the effect of vibration because almost
machines and engineering structures experiences vibrations. Structures of plates have wide applications
in ships, bridges, etc. In the aeronautical field, analysis of thermally induced vibrations in non-
homogeneous plates of variable thickness has a great interest due to their utility in aircraft wings.
As technology develops new discoveries have intensified the need for solution of various problems of
vibrations of plates with elastic or visco-elastic medium. Since new materials and alloys are in great
use in the construction of technically designed structures therefore the application of visco-elasticity is
the need of the hour. Tapered plates are generally used to model the structures. Plates with thickness
variability are of great importance in a wide variety of engineering applications.
The aim of present investigation is to study two dimensional thermal effect on the vibration of visco-
elastic square plate whose thickness varies parabolic in X-direction and temperature varies linearly in
one direction and parabolic in another direction. It is assumed that the plate is clamped on all the four
edges and its temperature varies linearly in both the directions. Assume that non homogeneity occurs in
Modulus of Elasticity. For various numerical values of thermal gradient and taper constants; frequency
for the first two modes of vibration are calculated with the help of latest software. All results are shown
in Graphs.
2 Equation Of Motion
Differential equation of motion for visco-elastic square plate of variable thickness in Cartesian
coordinate [1]:
[D1 ( W,xxxx +2W,xxyy +W,yyyy ) + 2D1,x ( W,xxx +W,xyy ) + 2D1,y ( W,yyy +W,yxx ) +
D1,xx牋 xx +ν W,yy ) + D1,yy (W,yy +ν W,xx ) + 2(1−ν )D1,xy W,xy ] − ρhp2W =
0(W,
?
(1)
which is a differential equation of transverse motion for non-homogeneous plate of variable thickness.
Here, D1 is the flexural rigidity of plate i.e.
D1 = Eh 3 / 12(1 − v 2 ) (2)
and corresponding two-term deflection function is taken as [5]
W = [(x / a)( y / a)(1− x / a)(1− y / a)]2[ A + A2 (x / a)( y / a)(1− x / a)(1− y / a)]
1 (3)
Assuming that the square plate of engineering material has a steady two dimensional, one is linear and
another is parabolic temperature distribution i.e.
1
2. Advances in Physics Theories and Applications www.iiste.org
ISSN 2224-719X (Paper) ISSN 2225-0638 (Online)
Vol 2, 2011
τ = τ 0 (1 − x / a )(1 − y 2 / a 2 ) (4)
where, τ denotes the temperature excess above the reference temperature at any point on the plate and
τ 0 denotes the temperature at any point on the boundary of plate and “a” is the length of a side of
square plate. The temperature dependence of the modulus of elasticity for most of engineering
materials can be expressed in this
E = E0 (1 - γτ) (5)
where , E0 is the value of the Young's modulus at reference temperature i.e. τ = 0 and γ is the slope
of the variation of E with τ . The modulus variation (2.5) become
E = E0 [1 − α (1 − x / a)(1 − y 2 / a 2 )] (6)
where, α = γτ 0 (0 ≤ α < 1) thermal gradient.
It is assumed that thickness also varies parabolically in one direction as shown below:
h = h0 (1 + β1 x 2 / a 2 ) (7)
where, β1 & β2 are taper parameters in x- & y- directions respectively and h=h0 at x=y=0.
Put the value of E & h from equation (6) & (7) in the equation (2), one obtain
D1 = [E0[1−α (1− x / a)(1− y2 / a2 )]h03 (1+ β1x2 / a2 )3 ]/12(1− v2 ) (8)
Rayleigh-Ritz technique is applied to solve the frequency equation. In this method, one requires
maximum strain energy must be equal to the maximum kinetic energy. So it is necessary for the
problem under consideration that
δ (V *
− T *) = 0 (9)
for arbitrary variations of W satisfying relevant geometrical boundary conditions.
Since the plate is assumed as clamped at all the four edges, so the boundary conditions are
W = W ,x = 0 , x = 0, a
W = W, y = 0 y = 0 , a (10)
,
Now assuming the non-dimensional variables as
X = x / a, Y = y / a,W = W / a, h = h / a (11)
The kinetic energy T* and strain energy V* are [2]
1 1
T *
= (1 / 2 ) ρ p 2 h 0 a 5 ∫ ∫ [(1 + β 1 X 2 )W 2 ]d Y d X (12)
0 0
and
1 1
V * = Q∫ ∫ [1 − α (1 − X )(1 − Y )](1 + β1 X 2 ) 3 {(W , XX ) 2 + (W ,YY ) 2
2
0 0
(13)
+ 2 vW , XX W ,YY + 2(1 − v )(W , XY ) 2 }dYdX
Using equations (12) & (13) in equation (9), one get
(V** − λ2T**) = 0 (14)
where,
1 1
V ** = ∫ ∫ [1 − α (1 − X )(1 − Y )](1 + β1 X 2 )3{(W , XX ) 2 + (W ,YY ) 2
2
0 0
(15)
+2vW , XX W ,YY +2(1 − v )(W , XY ) 2 }dYdX
and
1 1
T ** = ∫ ∫ [(1 + β X )W
2
1 ]dYdX (16)
0 0
Here, λ =12ρ(1− v2 )a2 / E0h02 is a frequency parameter.
2
2
3. Advances in Physics Theories and Applications www.iiste.org
ISSN 2224-719X (Paper) ISSN 2225-0638 (Online)
Vol 2, 2011
Equation (16) consists two unknown constants i.e. A1 & A2 arising due to the substitution of W. These
two constants are to be determined as follows
∂ (V ** − λ 2T ** ) / ∂An , n = 1, 2 (17)
On simplifying (17), one gets
bn1 A1 + bn2 A2 = 0 , n =1, 2 (18)
where, bn1, bn2 (n=1,2) involve parametric constant and the frequency parameter.
For a non-trivial solution, the determinant of the coefficient of equation (18) must be zero. So one gets,
the frequency equation as
b1 1 b1 2
= 0 (19)
b 21b 22
With the help of equation (19), one can obtains a quadratic equation in λ2 from which the two values of
λ 2 can found. These two values represent the two modes of vibration of frequency i.e. λ1(Mode1) &
λ2(Mode2) for different values of taper constant and thermal gradient for a clamped plate.
3 Results and Discussion
All calculations are carried out with the help of latest Matrix Laboratory computer software.
Computation has been done for frequency of visco-elastic square plate for different values of taper
constants β1 and β2, thermal gradient α, at different points for first two modes of vibrations have been
calculated numerically.
In Fig I: - It is clearly seen that value of frequency decreases as value of thermal gradient increases
from 0.0 to 1.0 for β1 = β2 =0.0 for both modes of vibrations.
In Fig II: - Also it is obvious to understand the decrement in frequency for β1= β2=0.6. But it is also
noticed that value of frequency is increased with the increment in β1 and β2
In Fig III: - It is evident that frequency decreases continuously as thermal gradient increases, β1=0.2,
β2=0.4 respectively with the two modes of vibration.
In Fig IV :- Increasing value of frequency for both of the modes of vibration is shown for increasing
value of taper constant β2 from 0.0 to 1.0 and β1=0.2, α=0.4 respectively. Note that value of frequency
increased.
3
4. Advances in Physics Theories and Applications www.iiste.org
ISSN 2224-719X (Paper) ISSN 2225-0638 (Online)
Vol 2, 2011
Frequency Vs Thermal gradient
150
120
β1=β2=0.0
Mode1
90
λ
60
Mode2
30
0
0 0.2 0.4 0.6 0.8 1
α
Fig I:- Frequency vs. thermal gradient at β1= β2=0.0
Frequency Vs Thermal gradient
300
250
200 β1=β2=0.6
Mode1
150
λ
100 Mode2
50
0
0 0.2 0.4 0.6 0.8 1
α
Fig II:- Frequency vs. thermal gradient at β1= β2=0.6
4
5. Advances in Physics Theories and Applications www.iiste.org
ISSN 2224-719X (Paper) ISSN 2225-0638 (Online)
Vol 2, 2011
Frequency Vs Thermal gradient
210
180
β1=0.2, β2=0.4
150 Mode1
120
λ
90
Mode2
60
30
0
0 0.2 0.4 0.6 0.8 1
α
Fig III:- Frequency vs. thermal gradient at β1=0.2, β2=0.4
Frequency Vs Taper parameter
300
250 β1=0.4, α=0.2
200 Mode1
150
λ
100 Mode2
50
0
0 0.2 0.4 0.6 0.8 1
β2
Fig IV:- Frequency vs. Taper constant at β1=0.2, α=0.2
5
6. Advances in Physics Theories and Applications www.iiste.org
ISSN 2224-719X (Paper) ISSN 2225-0638 (Online)
Vol 2, 2011
4. Conclusion
Results of the present paper are compared with [5] and it is found close agreement between the
values of frequency for the corresponding values of parameters. Main aim for this research is to
develop a theoretical mathematical model for scientists and design engineers so that they can
make a use of it with a practical approach for the welfare of entire planet.
Acknowledgement
It is with a feeling of great pleasure that we would like to express my most sincere heartfelt gratitude to
Sh. Tarsam Garg, Chancellor of MM University, Haryana (INDIA) and Head of the Mathematics Dept.
Prof. (Dr.) Deepak Gupta for providing us the necessary facilities in the department.
5. References
1. A.K. Gupta and Lalit Kumar. (2008). “Thermal effects on vibration of non-homogeneous
visco-elastic rectangular plate of linearly varying thickness in two directions”, Meccanica,
Vol.43, pp. 47-54.
2. A.K. Gupta and Anupam Khanna.(2010). “Thermal Effect On Vibrations Of Parallelogram
Plate Of Linearly Varying Thickness”, Advanced Studies Of Theoretical Physics, Vol.4, No.17,
pp. 817-826.
3. A.K.Gupta and Harvinder Kaur. (2008). “Study of the effect of thermal gradient on free
vibration of clamped visco-elastic rectangular plates with linearly thickness variations in both
directions”, Meccanica , Vol. 43(4), pp. 449-458.
4. A. Khanna, Ashish Kumar Sharma and Meenu Bhatia . (2011). “Vibration of Non-homogenous
Visco-Elastic Square Plate of Variable Thickness in Both Directions”, Innovative System
Design and Engineering, U.S.A. ,Vol.2. No.3, pp. 128-134.
5. A. Khanna, A. Kumar and M. Bhatia.( 2011). “A Computational Prediction on Two
Dimensional Thermal Effect on Vibration of Visco-elastic Square Plate of Variable Thickness”,
Presented and Published in Proceeding of CONIAPS XIII, held in UPES, Deharadun.
6. A. Khanna, Ashish Kumar Sharma. (2011). “Study of free Vibration of Visco-Elastic Square
Plate of Variable Thickness with Thermal Effect”, Innovative System Design and Engineering,
U.S.A., Vol.2. No. 3, pp. 108-114..
6
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Public Policy and Administration Research PPAR@iiste.org Zeitschriftenbibliothek EZB, Open J-Gate,
International Affairs and Global Strategy IAGS@iiste.org OCLC WorldCat, Universe Digtial Library ,
Research on Humanities and Social Sciences RHSS@iiste.org NewJour, Google Scholar.
Developing Country Studies DCS@iiste.org IISTE is member of CrossRef. All journals
Arts and Design Studies ADS@iiste.org have high IC Impact Factor Values (ICV).