Shape parameter selection for multi-quadrics function method in solving electromagnetic boundary value problems
ISSN: 0332-1649
Article publication date: 4 January 2016
Abstract
Purpose
The multi-quadrics (MQ) function is a kind of radial basis function. And the MQ method has been successfully adopted as a type of meshless method in solving electromagnetic boundary value problems. However, the accuracy of MQ interpolation or solving equations is severely influenced by shape parameter. Thus the purpose of this paper is to propose a case-independent shape parameter selection strategy from the aspect of coefficient matrix condition number analysis.
Design/methodology/approach
The condition number of coefficient matrix is investigated. It is shown that the condition number is only a function of shape parameter and MQ node number, and is irrelevant to the interpolated function which means case-independent. The effective condition number which takes into account the interpolated function is introduced. Then, the relation between the relative root mean square error and condition number is analyzed. Three numerical experiments as transmission line, cable channel and grounding metal box model were carried out.
Findings
In the numerical experiments, there is an approximate linear relationship between the logarithm of the condition number and shape parameter, an approximate quadratic relationship with node number. And the optimal shape parameter is corresponding to the early stage of condition number oscillation.
Originality/value
This paper proposed a case-independent shape parameter selection strategy. For a finite precision computation, the upper limit of the condition number is predetermined. Therefore, the shape parameter can be chosen where condition number oscillates in early stage.
Keywords
Acknowledgements
This work was supported by the National Natural Science Foundation of China (No. 51377174).
Citation
Zhang, H., Guo, C., Su, X. and Chen, L. (2016), "Shape parameter selection for multi-quadrics function method in solving electromagnetic boundary value problems", COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, Vol. 35 No. 1, pp. 64-79. https://doi.org/10.1108/COMPEL-12-2014-0350
Publisher
:Emerald Group Publishing Limited
Copyright © 2016, Emerald Group Publishing Limited