CDH/AMLS
"Impressive Accuracy and Performance to Support Detailed Modeling and High Frequency Analysis"
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 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.
CPU
CDH/AMLS typically reduces the amount of CPU time required by a minimum factor of about three to five.
I / O
A more important reduction, in many cases, is the reduction in data transferred (I/O) by a factor of about forty to fifty.
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.
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
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.
- 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
Software-Hardware Support:
| Supported Software: | Supported Hardware: | |
|---|---|---|
| MSC.NASTRAN | Linux64 (x86_64) | MSC.NASTRAN is a proprietary product of MSC.Software Corporation. |
| NX NASTRAN | Linux64 (x86_64) | NX NASTRAN is a proprietary product of Siemens Product Lifecycle Management Software Inc. |
| Altair RADIOSS | Linux64 (x86_64) | Altair RADIOSS is a proprietary product of Altair Engineering, Inc. |
| Altair OPTISTRUCT | Linux64 (x86_64) | Altair OPTISTRUCT is a proprietary product of Altair Engineering, Inc. |
| ESI VPS | Linux64 (x86_64) | ESI VPS is a proprietary product of the ESI Group |
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At Volvo Cars, we have been using CDH/AMLS for some 10 years now and it has helped us reduce time of our NVH/CAE simulations by nearly an order of magnitude with respect to standard Lanczos. The newest v5 offers another 30% improvement over v4. The possibility to run AMLS even for fluid domain makes very fine fluid meshes easy to incorporate in analyses."
Having been using CDH/AMLS at PSA for more than 10 years, we experienced CDH/FastFRS V2 with CDH/AMLS V5. Thus, on the biggest vibroacoustical analysis cases we have improved user time up to 90% over V4, thanks to our new CDH solvers configuration. As a result for NVH project design, faster computations are available and wider frequency range studies are allowed."
