MEscope Visual SDM

What is MEscope Visual SDM?

Visual SDM helps you quickly evaluate workarounds for resonance problems by adding additional tools to the modal analysis capabilities of a Visual Modal package. The Structural Dynamics Modification (SDM) method allows you to examine the effects of a variety of potential structural modifications on the resonances of a structure without actually having to make the physical modifications.

The VT-540 Visual SDM calculates the effects of making physical modifications to a structure in its vibration modes. With SDM, FEA elements can be added to (or subtracted from) a structure model, and new structure modes are calculated. SDM commands use industry-standard finite elements. Finite elements are called FEA Objects in The MEscope.

Visual SDM key points:

1.     Count the number of modes using a Mode Indicator function

2.     New modes are calculated quickly that show the effects of various modifications

3.     Eat a modal residual (a modal shape component) for each mode and each measurement. Industry standard FEA elements. Physical modifications are modeled using industry-standard FEA elements

4.     Many cases "what if" rapid calculation allows many potential modifications to be explored

Visual SDM Features

Modifications modeled with SDM

• Masses Point Masses modeling translational or rotational inertia
• Springs and shock absorbers Translational springs and shockabsorbers that model axial forces, 3 DOF or 6 DOF
• Sticks the properties of the cross section of the model
• See the properties of the cross section and the inertias of the model
• Triangular and quadrilateral plates modeling translational and rotational properties
• Solid elements of tetrahedron, prism and brick
• Tuned absorber (model a bulk spring damper to reduce vibration levels)
• Substructure Couple multiple structures
• Modal sensitivity, find the best solution among 1000 potential modifications

Modal Sensitivity Analysis

• Answers the question "How much stiffness does it take to change a mode to a higher frequency?"
• Answers the question "How much mass can be added without changing a very low frequency mode?"
• Answers the question "How much joint stiffness is required to match multiple target EMA frequencies?"
• Solution classifies 1000 modifications based on the difference between modified and target modal frequencies and damping
• Modified and target modes, modified and target mode pairs can be selected for sorting solutions

Finite Element Analysis (FEA) at ME'scope

• Element Library Uses an Industry Standard FEA Element Library
• FEA Assistant fills the 3D model with FEA elements
• Element Library Uses an Industry Standard FEA Element Library
• Material and element properties, material properties, and user-defined elements saved with each project
• FEA modes Normal modes (without damping) or complex modes (with damping) are calculated
• Shape expansion FEA mode shapes can be used to expand DOFS in ODS and EMA mode shapes
• Import and export FEA models and FEA modes imported and exported to NASTRAN, Ansys and other popular formats

FEA model update

• FEA model the physical properties in an FEA model are updated so that your FEA modes more match EMA modes
• Updated FEA properties: (Point mass, spring stiffness, viscous damping / Cross-section area of the rod and beam and inertias / Area of the cross-section of the rod and beam and inertias / elasticity of the material, density, poissons ratio)
• Exhaustive search evaluates thousands of SDM solutions for closer matching of modal shapes
• The local regions of a structure can be selected for FEA property update
• Pairs in FEA and EMA mode are selected to sort the closest matches
• Export of updated FEA model in popular FEA formats

System requirements:

CPU: 1.8 GHz dual core processor

RAM: 2 GB

HDD / SSD: 50 GB of free space on the main drive

Operating system: Microsoft Windows 8 32-bit, Microsoft Windows 7 32-bit and Microsoft Windows Vista 32-bit

Resolution: 1024×768