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Dumitru Baleanu, Mohsen Alipour, Hossein Jafari, "The Bernstein Operational Matrices for Solving the Fractional Quadratic Riccati Differential Equations with the Riemann-Liouville Derivative", Abstract and Applied Analysis, vol. 2013, Article ID 461970, 7 pages, 2013. https://doi.org/10.1155/2013/461970
The Bernstein Operational Matrices for Solving the Fractional Quadratic Riccati Differential Equations with the Riemann-Liouville Derivative
We obtain the approximate analytical solution for the fractional quadratic Riccati differential equation with the Riemann-Liouville derivative by using the Bernstein polynomials (BPs) operational matrices. In this method, we use the operational matrix for fractional integration in the Riemann-Liouville sense. Then by using this matrix and operational matrix of product, we reduce the problem to a system of algebraic equations that can be solved easily. The efficiency and accuracy of the proposed method are illustrated by several examples.
The Riccati differential equation is named after the Italian Nobleman Count Jacopo Francesco Riccati (1676–1754). The book of Reid  contains the fundamental theories of the Riccati equation, with applications to random processes, optimal control, and diffusion problems. Moreover, it is well known that the one-dimensional static Schrödinger equation is closely related to a Riccati differential equation . Solitary wave solution of a nonlinear partial differential equation can be represented as a polynomial in two elementary functions satisfying a projective Riccati equation .
In this paper, we are dealing with the fractional quadratic Riccati differential equation as follows: subject to the initial conditions where ?? = are constants and , , and are known functions. We can see  to guarantee the existence and uniqueness of the solution of (1) with initial conditions (2).
The general response expression (1) contains a parameter , the order of the fractional derivative that can be varied to obtain various responses. In the case that is integer, then (1) is reduced to the classical Riccati differential equation.
This problem to develop the analytical and numerical method to solve the Riccati differential equation with standard derivative, the Caputo fractional derivative and the Riemann-Liouville fractional derivative, has attracted much attention and has been studied by many authors [5–18].
The aim of this work is using the Bernstein polynomials for solving the problem (1) and (2). We notice that the problem presented  was in the Caputo sense but in our work, the problem is with the Riemann-Liouville derivative; therefore we considered a more general space of functions. Also, in , the authors used the polynomials in the form of = ?? = that is different from the standard Bernstein polynomials. So, the operational matrices in this work are different from those in .
The organization of this paper is as follows. In Section 2, the Bernstein polynomials are introduced. Some basic definitions and properties of the fractional calculus and also the BPs operational matrix for the Riemann-Liouville fractional integration are presented in Section 3. In Section 4, by BPs operational matrices, we solve the fractional quadratic Riccati differential equation. In Section 5, we discuss the convergence of the proposed method. In Section 6, several examples are considered to evaluate the power and effectiveness of the presented method. Some conclusions are summarized in the last section.
2. The Bernstein Polynomials and Their Properties
As a result, any polynomial of degree can be expanded in terms of linear combination of ?? as given below: where The approximation of functions within the Bernstein polynomials and convergence analysis can be found in [20, 21].
3. BPs Operational Matrix for the Riemann-Liouville Fractional Integration
In this section, firstly, we give some basic definitions and properties of the fractional calculus which are used further in this paper.
Lemma 4. If , , and , then
Theorem 5. One can get BPs operational matrix from order for the Riemann-Liouville fractional integral as
Proof. See .
4. BPs for Solving the Fractional Quadratic Riccati Differential Equation
Firstly, we use the initial conditions to reduce a given initial-value problem to a problem with zero initial conditions.
So, we define where is some known function that satisfied the initial conditions (2) and is a new unknown function.
Substituting (13) in (1) and (2), we have an initial-value problem as follows: subject to the initial conditions On the other hand, by (11) in Lemma 4 we can write Also, by using Lemma 3.3 in  the inputs , , , and can be approximated as follows: where , , and are known column vectors and is an unknown column vector.
Now, by substituting (17)–(21) into (14), we obtain Then, from Lemma??3.5 in  we have Therefore we can reduce (22) by (23)–(25) as Finally, we obtain the following nonlinear system of algebraic equation: such that by solving this system we can obtain the vector . Then, we can get
5. Convergence Analysis
In this section, we investigate the convergence analysis for the method presented in Section 4.
The problem (14) changes to the following problems since By taking we obtain the following fractional integral equation: If we use the approximation , then the problem (31) from space reduces to the following problem in space : Now, similar to Theorem??6.1 in , we propose the next theorem.
Theorem 6. Suppose that is the exact solution of (31) and , where Then one has as (i.e.,?? as ).
Proof. Substituting (17), (19), (20), and (12) in (32) we have
From Lemmas 2.3 and??4.1 in , we have as . So we can observe that as increases, (34) gets close to (32). Now, by taking we propose the following problem that gets close to (32) as increases:
Then by (23) and (25), (35) reduces to the following equation:
Equation (36) gets to (35) as , because from Lemma??3.1 in  as . Then by deleting , , taking , and using (24) in (36), we have
where, from Lemma??3.1 in , as . Now, by taking and deleting in (37), we get (26). Obviously, if is solution of (32), then we have ?? as .
On the other hand, from Theorem 6 we obtained as . Therefore we can write as and the proof is complete.
6. Illustrative Numerical Examples
In this section, we apply our method with (BPs of degree ) to solve the following examples. We define and for the approximate solution and the exact solution, respectively.
Example 1. Consider the nonlinear Riccati differential equation : subject to the initial condition as . The exact solution of the equation for is given as Numerical results compared to  are given in Table 1 and also Figure 1 shows the absolute error for our method for and Figure 2 shows behavior for different values of .
Example 2. Consider the following quadratic Riccati differential equation of fractional order  subject to the initial condition as . The exact solution of the equation for is given as Numerical results compared to  are given in Table 2 and also, Figure 3 shows the absolute error for our method for and Figure 4 shows behavior for different values of .
Example 3. Consider the nonlinear fractional differential equation: with the initial conditions This problem has been studied by using ADM , FDTM , and BPFs . Our results with , are compared to [25–27] in Tables 3 and 4. Therefore, we see that our method is very effective and obtained solutions that are in good agreement with the results in [25–27]. Also, Figure 5 shows behavior for different values of .
In this paper, we proposed a numerical method for solving the fractional quadratic Riccati differential equations by the operational matrices of the Bernstein polynomials. We applied operational matrix for fractional integration in the Riemann-Liouville sense. Then by using this matrix and operational matrix of product, we reduced the fractional quadratic Riccati differential equation to a system of algebraic equations that can be solved easily. Finally, examples have been simulated to demonstrate the high performance of the proposed method. We saw that the results were in good agreement with the analytical solutions and the solutions in the open literatures. Also, we observed that the solutions approach to classical solutions as the order of the fractional derivatives approaches 1, for fixed .
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