Structural Dynamics

Structural Dynamics

  1. All Categories
  2. Structures - Structural Dynamics
  3. Why might a Modal analysis performed on unconstrained assembly not produce six rigid body modes with zero frequency?

Why might a Modal analysis performed on unconstrained assembly not produce six rigid body modes with zero frequency?

Tagged: 18.2, mechanical, Modal/Harmonic Response, structural-dynamics, structural-mechanics
    • January 25, 2023 at 7:34 am
      FAQFAQ
      Participant

      If penalty based contacts are used to tie the parts together, this could introduce artificial stiffness that can affect the free modes. In particular this could affect the three rotational modes. To avoid this try changing the contact formulation to MPC. This should result in six rigid body modes with zero frequency

Featured Articles

Introducing Ansys Electronics Desktop on Ansys Cloud

The Watch & Learn video article provides an overview of cloud computing from Electronics Desktop and details the product licenses and subscriptions to ANSYS Cloud Service that are...

How to Create a Reflector for a Center High-Mounted Stop Lamp (CHMSL)

This video article demonstrates how to create a reflector for a center high-mounted stop lamp. Optical Part design in Ansys SPEOS enables the design and validation of multiple...

Introducing the GEKO Turbulence Model in Ansys Fluent

The GEKO (GEneralized K-Omega) turbulence model offers a flexible, robust, general-purpose approach to RANS turbulence modeling. Introducing 2 videos: Part 1 provides background information on the model and a...

Postprocessing on Ansys EnSight

This video demonstrates exporting data from Fluent in EnSight Case Gold format, and it reviews the basic postprocessing capabilities of EnSight.

© 2023 Copyright ANSYS, Inc. All rights reserved.