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What is CDH/AMLS? 
CDH/AMLS is a revolutionary new software that dramatically reduces the cost of frequency response and eigenvalue analysis for large finite element models. In Automated MultiLevel Substructuring, a finite element model with millions of degrees of freedom is automatically divided into about 10,000 substructures arranged in a tree that has about 20 levels. The model is transformed to a very efficient and accurate representation in termCDs of substructure eigenvectors. This method reduces the analysis burden greatly by reducing the computation required thus enabling workstations and multiprocessor computing platforms to be used and reducing disk space requirements and job turnaround time.  NASTRAN Implementation
CDH/AMLS has been implemented with an interface to MSC Nastran, MD NASTRAN, NX-NASTRAN and OPTISTRUCT software so that it can be used in industrial vibration analysis. CDH/AMLS can be used in normal modes (NASTRAN SOL 103), modal frequency response (NASTRAN SOL 111), modal transient response (NASTRAN SOL 112), and structural optimization (NASTRAN SOL 200) solution sequences. Either use requires a minimum of effort on the part of the user; the user must add only two lines to an input data file to convert a standard Nastran job into one that uses CDH/AMLS. Once the system matrices have been assembled by Nastran, the Nastran job calls CDH/AMLS software for the compute-intensive portions of the analysis, and results are returned to Nastran for postprocessing if necessary. Alternatively, the analysis may be continued in CDH/VAO, a state-of-the-art interactive dynamics analysis program. Performance
Accuracy
Summary
MSC NASTRAN is a proprietary product of MSC.Software Corporation MD NASTRAN is a proprietary product of MSC.Software Corporation NX-NASTRAN is a proprietary product of UGS Corporation RADIOSS and OPTISTRUCT are proprietary products of ALTAIR Corporation |
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