CDH/AMLS - CDH-AG

CDH/AMLS is a revolutionary 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 terms 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.

CDH/AMLS has been implemented with an interface to MSC.NATRAN, MD NASTRAN, NX NASTRAN and ALTAIR RADIOSS software so that it can be used in industrial vibration analysis.

CDH/AMLS can be used in normal modes (SOL 103), modal frequency response (SOL 111), modal transient response (SOL 112), and structural optimization (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 stateof- the-art interactive dynamics analysis program.

Modified NASTRAN solution sequence

CDH/AMLS execution workflow

CPU

CDH/AMLS typically reduces the amount of CPU time required by a minimum factor of about 3 to 5.

I/O

A more important reduction, in many cases, is the reduction in data transferred (I/O) by a factor of about 40 to 50.

AMLS produces an approximation whose accuracy is more than adequate for engineering purposes.

0-50 Hz:	< 0.003% error
50-100 Hz:	< 0.015% error
100-200 Hz:	< 0.05% error
200-300 Hz:	< 0.13% error
300-400 Hz:	< 0.30% error

Comfortable and easy usage
Compatible to standard Nastran and RADIOSS software
High Accuracy
Drastic Reduction in computer and hardware cost
Impressive Performance leads to shorter elapsed time and higher productivity

Reduction of FE-modeling cost by using one master model for multiple analysis disciplines e.g. Crash-, Static- and NVH-Analysis
Make higher frequency range analysis feasible

OPERATING SYSTEM

Linux64 (x86_64)

SUPPORTED SOLVERS / SOFTWARE

MSC.NASTRAN
NX NASTRAN
Altair RADIOSS
Altair OPTISTRUCT
ESI VPS

Note:
MSC.NASTRAN is a proprietary product of MSC.Software Corporation. NX NASTRAN is a proprietary product of Siemens Product Lifecycle Management Software Inc.. Altair RADIOSS and Altair OPTISTRUCT are proprietary products of Altair Engineering, Inc.. ESI VPS is a proprietary product of the ESI Group.

You can try this product free of charge for 30 days.

Request trial license

CDH/AMLS Brochure
CDH Success Story AMLS/FastFRS