Citation
Abstract
The conventional procedure used to condense the solution of eigenvalue problems for recovery of the lowest modes is tested by application to practical example structures. Evaluations are made of eigenvalue accuracy with respect to numbers of retained solution vectors. It is shown that solutions are likely to be inaccurate except in the special case of when prior knowledge of the mode shapes is available. One improvement for recovering the lowest modes is to supplement the retained vectors with static loading displacement functions. A further remedy is to perform iterative repetitions of the solution procedure. Great improvements in accuracy can be achieved with only a few iterative cycles. These improvements are effective in the typical case of when only a few valid lowest-mode solutions are required and the order of the problem is large so that it becomes important to minimize the computational time by means of solution condensation.
Details
- Volume
- VII
- Published
- February 15, 1972
- Pages
- 142–153
- File Size
- 1.1 MB