Differential Equation Essay

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Differential equation has its application in different area of knowledge of mankind. A few such examples are: the motion of a projectile, rocket, planet or satellite, the charge or current in an electric circuit, the reactions of chemicals, the rate of growth of a population, spring mass systems, bending of beams, the conduction of heat in a rod or in a slab etc. The mathematical formulations of all of the problems give rise to differential equations. Basically, most of the differential equations involving physical phenomena are nonlinear. It is simple to solve the differential equations which are linear but the solution of nonlinear equations are laborious and in some cases it is impossible to solve them analytically. In such circumstances …show more content…

But sometimes, such a linearization may lead to real errors not only of a quantitative but also of a qualitative nature. And when the linearization is not possible, the original nonlinear equation itself must be treated. With the discovery of numerous phenomena of self-excitation of circuits containing nonlinear capacitor of electricity, like electron tubes, gaseous discharge etc. and in many cases of nonlinear mechanical vibrations of special types, the method of small oscillations becomes inadequate for their analytical treatment[*]. To this end, a number of methods are developed, such as straight forward expansion method, Lindtsteadt-Poincare (LP) method, Modified LP method, Struble technique, Harmonic balance method, the Krylov-Bogoliubov-Mitropolskii (KBM) perturbation method …show more content…

At present the method is used to obtain oscillatory as well as damped oscillatory, critically damped, over damped, near critically damped, more critically damped solutions of second, third, fourth etc. order nonlinear differential equations by imposing some precise conditions to make the solutions uniformly valid. The method of Krylov and Bogoliubov is called an asymptotic method in the sense An asymptotic series itself may not be convergent but for a fixed number of terms, the approximate solution tends to the exact solution as is very near to zero. Perturbation methods have recently been received much attention for investigating solutions of dynamic, stochastic and economic equilibrium models, both single-agent or rational-expectations models and multi-agent or game-theoretic models. A perturbation method is based on the attribute that the equations to be solved are sufficiently “smooth” or sufficiently differentiable in the required regions of variables and parameters. First of all, Van der Pol concentrated to the self-excited oscillations and indicated that their existence is natural and the systems are governed by nonlinear differential equations. This nonlinearity appears, thus as the very essence of these phenomena and by linearizing the differential equation in the sense of the method of small oscillations, one simply eliminates

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