MORPACK - Overview

Model order reduction with conventional FE-software

• 2 available reduction methods: Guyan-reduction and Component-Mode-Synthesis (CMS), e.g. in ANSYS
• no elaborate validation
• no user feedback
• no automatization

Advantages of MORPACK compared to conventional FE-software

• qualitatively better reduced and smaller models compared to standard techniques by using sophisticated reduction methods
• reduction quality independent from choice of master-nodes
• efficient data handling
• large variety of methods and selections for advanced users
• standard selections for beginners, which were determined by numerous tests

Further features of MORPACK

• modular concept for individual solutions
• implemented in MATLAB with comfortable GUI and batch-modus
• interactive help and user feedback including plausibility check
• models with a degree of freedom larger 1 Mio. can be handled on conventional desktop PCs
• for larger models an out-of-core library can be used

Module overview of MORPACK

Import-Module:  interfaces for different software packages available (ABAQUS, ANSYS, NASTRAN and SIMPACK) as well as import of measurement data from experimental modal analyses Connection-Module:  automated definition of interface connections (rigid/elastic) Additional-Nodes-Module:  automated and optimal selection of additional master-nodes (for correlation and reduction purposes) Reduction-Module:  numerous combined reduction methods for generation of minimal models (including back-transformation as well as generation of additional modes) Correlation-Module:  numerous correlation methods for validation of interface connections and reduction quality (based upon modal data, frequency response function and system matrices) Export-Module:  model export to SIMPACK, ANSYS and NASTRAN EMBS-Module:  simplified and 3-dimensional EMBS-algorithm in MATLAB for validation of elastic bodies and consideration of boundary conditions under inset-conditions (EMBS-assembly)

Reference models and benchmarks

• Gear box housing, DoF approx. 300,000  
• Bogie frame, DoF approx. 100,000 and 1,000,000  ,
• Vehicle frame, DoF approx. 1,200,000
• Crank shaft, DoF approx. 100,000 and 500,000
• Car body, DoF approx. 100,000 and 1,000,000