Derivation Of Moving Least-Squares Approximation Shape Functions And Its Derivatives Using The Exponential Weight FunctionAuthor(s): Effendy Tanojo
Journal: Civil Engineering Dimension ISSN 1410-9530
Volume: 9; Issue: 1; Start page: 19; Date: 2007;
Keywords: meshless methods | moving least-squares | weight function.
In recent years, meshless methods have gained their popularity, mainly due to the fact that absolutely no elements are required to discretize the problem domain. This is possible due to the nature of the approximation functions used in this method. Approximation functions used to form the shape functions use only the so-called ânodal selectionâ procedure without the need of elements definition. The most popular approximation function used is the moving least-squares shape functions. Published works in meshless methods, however, present only the basic formulas of the moving least-squares shape functions. This paper presents the complete and detailed derivations of not only the moving least-squares shape functions, but also their derivatives (up to the second order derivatives), using the exponential weight function. The derivations are then programmed and verified.