A Laplace domain finite element method (LDFEM) applied to diffusion and propagation problems in electrical engineering

✍ Scribed by X.-D. Cai; G. I. Costache

• Publisher: John Wiley and Sons
• Year: 1994
• Tongue: English
• Weight: 811 KB
• Volume: 7
• Category: Article
• ISSN: 0894-3370
• DOI: 10.1002/jnm.1660070606

✦ Synopsis

This paper presents a new finite element formulation in the Laplace domain for both diffusion and wave equations with applications in the field of electrical engineering. With the aid of congruence transformation of matrices, the finite element equations in the Laplace domain are solved and time-domain results can be obtained through the inverse Laplace transform. In a test problem, good agreement between the numerical results derived with :he present method and the analytical solutions has been found. For applications in which only Dirichlet and Neumann boundary conditions are involved, this new finite element approach can be applied and provide both frequency-domain and time-domain results in one run without any timestepping scheme. The limitations of using the congruence transformation in solving propagation problems are also addressed in this paper.