ANSYS varification manual 9

# Uniform and dissimilar mass fractions are specified

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Unformatted text preview: d. An AC (harmonic) analysis is run to simulate an RL circuit response with an applied excitation of 12 volts at 60 Hz. The complex coil current is calculated. Figure 206.1 Stranded Coil Problem Sketch Material Properties µr = 1.0 (coil) µr = 1.0 (air) ρ = 3 x 10-8 ohm-m (coil) Geometric Properties n = 500 turns s = .02 (coil winding width and depth) m r = (3 x s )/2 m Loading Vo = 12 volts (static) V = Vo cos ωt (harmonic) where Vo = 12 volts ω = 60 Hz ANSYS Verification Manual . ANSYS Release 9.0 . 002114 . © SAS IP, Inc. 1–468 VM206 Analysis Assumptions and Modeling Notes Due to symmetry only 1/4 of the problem domain is required. The open boundary is modeled with infinite elements to accurately represent the decaying field. The infinite element region is set to a depth (6xs) equal to the problem domain (6xs) for optimal performance. The coil is characterized through the real constant table. A direct voltage load is applied to the coil region. Nodes in the coil region are coupled in the CURR degree of freedom to solve for a single valued coil current (per turn). The coil resistance and inductance are calculated by summing element values in POST1. The real and imaginary current are extracted from the AC solution. From these calculated currents, and the applied voltage, the coil impedance can be calculated. Results Comparison Target Inductance, H .01274 .01275 1.00 3.534 3.534 1.00 Coil current, Amps Harmonic Analysis Ratio Resistance, Ohm Static Analysis ANSYS 3.3...
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