Download e-book for kindle: Advances in the Applications of Nonstandard Finite by Ronald E. Mickens

By Ronald E. Mickens

ISBN-10: 9812564047

ISBN-13: 9789812564047

ISBN-10: 9812703314

ISBN-13: 9789812703316

This quantity offers a concise creation to the technique of nonstandard finite distinction (NSFD) schemes development and indicates how they are often utilized to the numerical integration of differential equations happening within the normal, biomedical, and engineering sciences. those equipment had their genesis within the paintings of Mickens within the 1990's and at the moment are starting to be extensively studied and utilized by way of different researchers. the significance of the publication derives from its transparent and direct rationalization of NSFD within the introductory bankruptcy besides a huge dialogue of the long run instructions had to develop the subject.

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Extra resources for Advances in the Applications of Nonstandard Finite Difference Schemes

Example text

Wu Fig. 15. 001s). 15L 0 2 3 4 5 6 7 8 9 10 Time (s) Fig. 16. Tracking errors using nonstandard scheme I with step-size h = 10s. 40 R . F. Abo-Shanab, N . Sepehri and C. Q. Wu Fig. 17. Changes in the effective step-size, y, using nonstandard scheme I (step-size h = 10s). S i m u l a t i o n S t u d i e s of Robotic S y s t e m s Fig. 18. 001s. 41 42 R. Abo-Shanab, N . Sepehri and C. Q. Wu Time (s) Fig. 19. 001s). (o, using nonstandard scheme I1 (step--size Simulation Studies of Robotic Systems 43 Time (s) 0 1 2 3 4 5 6 7 8 9 10 Time (s) Fig.

Rj < . . < 7-N = 1. (4) In the subsequent subsections the derivation of the Buckmire MFD scheme for the cylindrical and spherical cases will be given. 1. T h e cylindrical case Consider B ( r ) which is defined as rdu dr where u = u ( r ) is an unknown function (the solution) the operator 721 acts on. The problem a t hand requires determining a numerical discretization or approximation for R1. There are several choices for discretizing B ( r ) ,the radial derivatives in cylindrical coordinates, but the standard forward-difference approximation method and the new nonstandard scheme were selected and will be compared with each other.

Q. 2. 1. Description of the Case In this case study, the manipulator is programmed to follow a desired trajectory using a proportional-derivative controller with gravity compensation. Thus, control torques IT^ (i = 1 , 2 ) are defined as follows: (37) where ei = (4%- q 2 d ) and 6%= (qi - q , d ) are the error and error derivative a t the manipulator joints, respectively. q i d and @id denote the desired joint angles and velocities. k z l and ki2 are the control gains, and Gi(i=l,2)are defined in ( 3 5 ) and (36).

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Advances in the Applications of Nonstandard Finite Difference Schemes by Ronald E. Mickens

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