Ansys APDL MODOPT 관해서...

MODOPT

 

MODOPT, Method, NMODE, FREQB, FREQE, Cpxmod, Nrmkey, ModType, BlockSize, --, --, --, FREQMOD

Specifies modal analysis options. =  고유진동수 구하기 

 

damped = 감쇠 = 마찰고려

undamped = 비감쇠  = 마찰 고려 x 

 

Method

- Mode-extraction method to be used for the modal analysis.

LANB	Block Lanczos
LANPCG	PCG Lanczos
SNODE	Supernode modal solver
SUBSP	Subspace algorithm
UNSYM	Unsymmetric matrix
DAMP	Damped system
QRDAMP	Damped system using QR algorithm
VT	Variational Technology

 

1. Block Lanczos

- 100차까지밖에 실행 안됨 

 

2. PCG Lanczos

- 100차까지밖에 실행 안됨 

 

 

3. Supernode modal solver

- When Method = SNODE, NMODE should be greater than 100 for 2-D plane or 3-D shell/beam models and greater than 250 for 3-D solid elements to be computationally efficient.

 

4.Subspace algorithm

5.Unsymmetric matrix

6. Damped system

7. Damped system using QR algorithm

8. Variational Technology