Product Announcement from Vibrant Technology, Inc.
VT-540 Visual SDM includes all of the features of Visual Modal, plus VES-5000 Structural Modifications. VT-560 Visual SDM Pro includes all of the features of Visual Modal Pro, plus VES-5000 Structural Modifications.
Once you've determined that there is a resonance problem in your machine or structure, the next question is, "How can the problem be fixed?"
Visual SDM & Visual SDM Pro help you investigate alternative solutions to resonance problems. Visual SDM & Visual SDM Pro adds additional tools for investigating structural modifications to all of the ODS and modal analysis features of either Visual Modal or Visual Modal Pro. The Structural Dynamics Modification (SDM) method lets you simulate the effects that a variety of potential modifications will have on the resonances of a structure without having to actually make them.
The resonances (modes) of a machine or structure depend on its physical properties (geometry, density, elasticity, boundary conditions, etc.). Changing the physical properties by adding brackets, stiffeners, tuned absorbers or other modifications, will affect the modes. Using Visual SDM or Visual SDM Pro, modifications are modeled using standard finite elements such as springs, masses, bars and plates. Then, using the mode shapes of the original (unmodified) structure, SDM calculates a new set of mode shapes for the modified structure.
For example, a stiffener was added across the bottom of an aluminum panel. Adding the stiffener replaces the first mode of the structure (a bending mode at 73Hz) with a torsional mode at 94Hz. The torsional mode was the second mode of the unmodified structure but was not affected by the rib stiffener. Without the stiffener, machinery operating at 4000-4500 RPM would excite the first bending mode of this panel causing it to resonate. Adding the stiffener not only eliminated the first mode at 73Hz, but also removed another mode at 143Hz, thus removing a potential resonance problem at 2X RPM as well.
- Interactive graphical addition of modification elements to a structure model.
- Displays modification elements on the structure model.
- Point mass, linear spring & linear damper elements.
- Rod & beam elements.
- Triangular & quadrilateral plate elements.
- Tetrahedron, prism & brick solid elements.
- Spreadsheets for finite element properties.
- Modal sensitivity analysis.
- Substructuring (connecting together two or more structures using finite elements).
- Tuned absorber (mass, spring, damper element).
- Scaling of operating modes.