Then the design methods of the parallel coupling SIR band-pass filter has been discussed, and analysed the different characteristic of the SIR resonator with the different impedance rate.

This model USES new coupling correction alternation direction implicit iterative solution, parallel calculation program design, alternative direction grid delineation and parallel data transference.

While with a composite patch, there exists coupling effect between the normal stress parallel to crack and the SIF, and the coupling effect is significantly dependent on ply orientation of the patch.