On deep-sea risers' modal research, based on classicaltheory, Matlab code is utilized to calculate modal result which will be compared withANSYS result. Besides, in ANSYS analyzing process, preprocessing andpostprocessing will be done with APDL code.
Deep sea risers are flexible with relatively largevalue of L/D. In different ranges of L/D, vibration characteristic of risers has not yetbeen dicussed up to now inland.