American Journal of Applied Mathematics
Volume 5, Issue 1, February 2017, Pages: 14-18

Application of the Differential Transform Method for the Nonlinear Differential Equations

Mohand M. Abdelrahim Mahgoub1, 3, Abdelbagy A. Alshikh2, 3

1Department of Mathematics, Faculty of Science & Technology, Omdurman Islamic University, Khartoum, Sudan

2Mathematics Department Faculty of Education-Alzaeim Alazhari University, Khartoum, Sudan

3Mathematics Department Faculty of Sciences and Arts-Almikwah-Albaha University, Albaha, Saudi Arabia

(M. M. A. Mahgoub)
(A. A. Alshikh)

Mohand M. Abdelrahim Mahgoub, Abdelbagy A. Alshikh. Application of the Differential Transform Method for the Nonlinear Differential Equations. American Journal of Applied Mathematics. Vol. 5, No. 1, 2017, pp. 14-18. doi: 10.11648/j.ajam.20170501.12

Received: October 15, 2016; Accepted: October 28, 2016; Published: January 18, 2017

Abstract: This paper aims to find analytical solutions of some analytical solutions of some non-linear differential equations using a new integral transform ''Aboodh transform'' with the differential transform method. The nonlinear terms can be easily handled by the use of differential transform method. This method is more efficient and easy to handle such differential equations in comparison to other methods. The results reveal that this method is very efficient, simple and can be applied to other nonlinear problems

Keywords: Aboodh Transform, Differential Transform Method, Nonlinear Differential Equations

Contents

1. Introduction

Many physical problems can be described by mathematical models that involve ordinary or partial differential equations. A mathematical model is a simplified description of physical reality expressed in mathematical terms. Thus, the investigation of the exact or approximation solution helps us to understand the means of these mathematical models. Several numerical methods were developed for solving ordinary or partial differential equations. In recent years, some researchers used many powerful methods for obtaining exact solutions of nonlinear partial differential equations, such as homotopy perturbation method [1-2], modified variational iteration method [3], non-perturbative methods [4], Adomian Decomposition Method (ADM) [5-6], and reduced differential transform method [7]. the differential transform method has been developed for solving the differential and integral equations. For example in [8] this method is used for solving a system of differential equations and in [9] for differential-algebraic equations. In [10-13] this method is applied to partial differential equations and in [14-16] to one- dimensional Volterra integral and integro-differential equations.

New integral transform "Aboodh transform" [17-23] is particularly useful for finding solutions for these problems. Aboodh transform is a useful technique for solving linear Differential equations but this transform is totally incapable of handling nonlinear equations because of the difficulties that are caused by the nonlinear terms. This paper is using differential transforms method to decompose the nonlinear term, so that the solution can be obtained by iteration procedure. This means that we can use both Aboodh transform and differential transform methods to solve many nonlinear problems.

2. Aboodh Transform

Definition:

A new transform called the Aboodh transform defined for function of exponential order we consider functions in the set A, defined by:

(1)

For a given function in the set M must be finite number, may be finite or infinite. Aboodh transform which is defined by the integral equation

(2)

Theorem (1)

Let  be Aboodh transform of  then:

(i) ,

(ii)

(iii) (3)

Proof

By the definition we have:

,

Integrating by parts, we get

3. Differential Transform

Differential transform of the function  for the k-derivative is defined as follows:

(4)

Where  is original function and  is the transformed function.

And the inverse differential transform of Y (k) is defined as:

The main theorems of the one – dimensional differential transform are.

Theorem (2): If , then

Theorem (3): If, Then

Theorem (4): If    then

Theorem (5): If     = then

Theorem (6): If w (x ) = y (x ) z (x ), then

Theorem (7): If  then

Note that c is a constant and n is a nonnegative integer.

4. Analysis of Differential Transform

In this section, we will introduce a reliable and efficient algorithm to calculate the differential transform of nonlinear functions.

I / Exponential nonlinearity:

From the definition of transform

(5)

Taking a differential of  with respect to x, we get:

(6)

Application of the differential transform to Eq (6) gives:

(7)

Replacing k +1 by k gives

(8)

Then from Eqs (5) and (8), we obtain the recursive relation

(9)

II / Logarithmic nonlinearity: , a +by > 0.

Differentiating , with respect to x, we get:

, or (10)

By the definition of transform:

(11)

Take the differential transform of Eq.(10) to get:

(12)

Replacing k +1 by k yields:

(13)

Put k =1 into Eq.(13) to get:

(14)

For k ³ 2, Eq. (13) can be rewritten as

(15)

Thus the recursive relation is:

5. Application

In this section we solve some nonlinear differential equation by combine Aboodh transform and differential transform method

Example (1)

Consider the simple nonlinear first order differential equation.

(16)

First applying Aboodh transform on both sides to find:

(17)

is the Aboodh transform of y(t ) ,

The standard Aboodh transformation method defines the solution  by the series.

(18)

Operating with Aboodh inverse on both sides of Eq (17) gives:

(19)

Substituting Eq (18) into Eq (19) we find:

(20)

Where , , and

For n = 0, we have:

For n =1, we have:

and

For n = 2, we haves:

and

The solution in a series form is given by.

Example (2)

We consider the following nonlinear differential equation.

(21)

In a similar way we have:

(22)

The inverse of Aboodh transform implies that:

(23)

The recursive relation is given by:

(24)

Where , and

The first few components of  are

,  ,   ,

,.....

From the recursive relation we have:

,

Then we have the following approximate solution to the initial problem.

Example (3)

Consider the nonlinear initial – value Problem

(25)

Applying Aboodh transform to Eq (25) and using the initial conditions, we obtain.

(26)

Take the inverse of Eq (26) to find:

(27)

The recursive relation is given by:

(28)

Whereand (29)

And

(30)

Then we have:

, and

, and

, and

Then the exact solution is:

Example (4)

Consider the initial –value problem of Bratu-type.

(31)

Take Aboodh transform of this equation and use the initial condition to obtain:

(32)

Take the inverse to obtain:

Then the recursive relation is given by:

(33)

Where and

(34)

Then from Eqs (33) and (34) we have

and

, , and

, , and

Then the series solution is

6. Conclusions

In this paper, the exact solutions of nonlinear differential equations are obtained by using Aboodh transform and differential transform methods. This method is more efficient and easy to handle such differential equations in comparison to other methods. the results reveal that this method is very efficient, simple and can be applied to other nonlinear problems.

Appendix

Table A1. Aboodh transform of some functions.

References

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