nTop 4.20 - What's New?

nTop 4.20 is here! This release features a Natural Frequency Constraint block, making constraining the Topology Optimization in the defined frequency range easier. As with every release, nTop's dedicated support team is ready to answer your questions. Please visit support.ntop.com to gain access to helpful tutorials and support articles.

Natural Frequency Constraint

  • The Natural Frequency Constraint combines design response constraint and natural frequency response. This block makes it easier for you to constrain the topology optimization to generate shapes with natural frequencies inside or outside the specified range.
  • Block Name: Natural Frequency Constraint
  • Location: Optimization > Constraints
  • Description: Define a natural frequency constraint for optimization to generate shapes with natural frequencies inside or outside the specified range.
    • Number of Modes: Number of modes that will be searched for and included in the constraint computation.
    • Band Type: This defines whether the natural frequency of the optimized shape lies inside or outside the range defined by the Min Frequency and Max Frequency inputs.
    • Min Frequency: The lower bound of the natural frequency range.
    • Max Frequency: The upper bound of the natural frequency range.
    • Load Case: Load case for the constraint.
    • Output: Optimization Constraint

The image below shows an example of avoiding any modes from 7500Hz (Lower Bound) to 25000Hz (Upper Bound)Natural Frequency Constraint

Usage Improvements

  • We added a new Recent Files tab in the Welcome Screen.Recent Files

Block Updates

  • We have updated the FE Region and FE Boundary types to include "fe mesh" in the properties panel to access the selected mesh region and "parent mesh" to access the entire mesh used to select the boundary.Natural Frequency Constraint
  • We have updated the Point Force and Point Moment blocks to include the Rigid (RBE2) or Flexible (RBE3) Connector input.
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