6、craftduringtherelativemotionbetweenthewater. EventuallywesolvethelandingwhentheplaneofA320inthebestpitchangleof9degrees. ModelIIusingthefluid/structurecoupledmethodsFSImodeltostudylawsoftheimpactofthepitchesangletowardthewatersurfaceimpactpressure,andforcedtolandduringthechangesofwater. A