MODENT

 

Modal analysis – OMA  –  Modal analysis quality check  –   Mode indicator functions  

 Principal response functions  –  Noise filtering

 

·       Generates frequency response function (FRF) files from modal, spatial and eigen data.

·       Eliminates  noise from measured FRFs

·       Computes SIMO & MIMO mode indicator functions

·        Computes principal response functions.

·       Performs modal analysis of SIMO & MIMO FRF data to extract the modal properties

·       Performs time- and frequency-domain OMA (Output-only or operational modal analysis)

·       Has special routines to detect non-linear behaviour

·       Collates results from individually-analyzed FRFs into a consistent modal data base

·       Checks the quality of modal analysis using the reciprocal vector method.

 

 

 

 

MODESH

 

Response overlay – Time- & frequency-domain animation –  FE-MA correlation

Structural modification – Complex-to-real modeshape conversion

 

·       Overlays several FRF plots from various origins: measurements, FE calculations, predictions via FRF coupling.

·       Animates measured/predicted mode shapes, producing operating deflection shapes and predicting forced response under arbitrary load.

·       Correlates experimental results with FE predictions using techniques such as 45o plots for frequencies and mode shapes, MAC, COMAC, SCO, mass and stiffness error matrix.

·       Performs structural modification, by adding mass, spring, damping elements, tuned absorbers and general mass, stiffness and damping matrices.

·       Converts complex mode shapes into equivalent real mode shapes.

 

 

 

 

 

MESHGEN

 

Mesh generation & editing – FINES data preparation – Co-ordinate transformation

 

·       Generates a mesh for

o     The animation of measured FRF data

o     Finite element module FINES

·       Modifies and existing mesh

·       Converts measurements made in a local co-ordinate system into a consistent global co-ordinate system.

·       Processes a .DSP file to prepare FINES input data

 

 

MODPLAN

 

Vibration test planning

 

 

 

·       Various test planning tools such as ODP, NODP, ADDOF. EI, etc.

·       Selection of optimum excitation, suspension and measurement points

·       Iteration for  best response points,

·        Computes the auto MAC of the selected measurement points.

A finite element model of the structure is needed.

 

 

 

 

 

 

MODIFY

 

Structural modification and sub-structuring analysis

 

It is often convenient to be able to consider a complex engineering structure as an assembly of substructures whose individual analysis is more efficient.

One particularly powerful application of the substructure approach is to a range of problems where it is required to combine subsystem or component models derived from different sources - perhaps from quite disparate analyses but often from a mixture of analytical and experimental studies. Thus one may seek to combine component models from theoretical analysis with others from modal tests. MODIFY provides the ideal platform for conducting such studies.

·    Support for various substructures: spatial, modal and response 3D uniform beams, damped multi-layer sandwich beams, gyroscopic rotors

·    Sub-system duplication

·    Fully damped analysis with viscous and structural damping models PROVISION for frequency-dependent properties

·    Real and complex eigensolutions GENERAL force input, including multi load cases

·    Calculation of response and transmissibility

·    Calculation of internally-transmitted forces and forces transmitted to ground option to include residuals in coupling

·    Compatibility with ICATS and Universal File formats

·    MODESH-compatible output for plotting

·    Extensive documentation and worked examples

 

 

 

FINES

 

Finite element analysis

 

 

FINES is the finite element solver of the ICATS suite of programs.

 

FINES is optimized for structural analysis and offers a number of features that are not found in standard commercial packages.

 

MESHGEN is the FINES pre-processor while MODESH is the  post-processor.

·       A 4-node, 6-DOF shell element that is specifically developed for vibration analysis

·       Multi-layer sandwich elements for vibration analysis

·       Ability to define complex elastic moduli to simulate non-proportionally damped systems

·       Complex eigensolution capability

 


 

 

Element Name

Element Shape

Order of Interpolation

Actual DOFs

3SLD06

1

1, 2, 3

3SLD08

1

1, 2, 3

3SLD10

2

1, 2, 3



3SLD15

2

1, 2, 3

3SLD20

2

1, 2, 3

 



3TRI03

1

1, 2, 3

3TRI06

2

1, 2, 3

3QUA04

1

1, 2, 3

3QUA08

2

1, 2, 3

3QUA09

2

1, 2, 3

 

 



UTILITIES

 

Auxiliary programs for specific tasks