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Roger Dale Carter Boulevard
Kannapolis, NC, 28027
(980) 556-7081
Sentek Dynamics - Total Solution Provider for Turn-Key Vibration Test Systems

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 * Shakers
    * Systems Available for Immediate Shipment
    * Electro-Dynamic Shakers
    * Dual Excitation Shaker Systems
    * Three-Axis Shakers
    * MESA Shaker Systems
    * Power Amplifiers
    * Slip Tables
    * Head Expanders & Fixtures
    * Vibration Control System

 * Chambers
    * Systems Available for Immediate Shipment
    * Temperature/Humidity Chambers
    * Combined Environmental Test Systems
    * Combined System Controller Software
    * Chamber Controller Software
    * EDM Cloud - Remote Monitoring for Chambers

 * Contract Testing & Service
    * Testing & Evaluation Services
    * Electric Battery Testing with CAN bus
    * Installation & Service
    * Demo, Service, & Assembly
    * Testing Lab Photos

 * Resources
    * Reference Materials
    * Common Testing Standards
    * Introduction to Vibration Testing Systems
    * Modal Testing Excitation Consideration
    * What's Required To Bring Vibration Testing In-House?
    * How to Select a Vibration Testing System
    * Sentek Dynamics’ THV Series Environmental Test Systems
    * Selection and Installation of Sentek Dynamics' THV Series Environmental
      Test Systems
    * FEA Animations
    * Installed Systems Gallery
    * Videos

 * About Us
    * News & Activities
    * Trade Shows & Conferences
    * Webinars & Seminars
    * Company
    * Careers
    * Clients
    * Contact Us





SENTEK DYNAMICS NEWS




PREDICTING MODES SHAPES USING FINITE ELEMENT ANALYSIS (FEA)

December 6, 2022 Mark Holland - Application Engineer

Finite Element Analysis (FEA) frequency simulation allows the user to perform
predictive analysis in the design phase and make alterations to the design if
any major issues in the design are encountered in the simulation. However, it
should be noted that real-world test data of the device should always be used to
verify FEA results. A device’s resonant frequencies and mode shapes at those
frequencies can be predicted using FEA. In this article, the resonant
frequencies of a flat plate will be analyzed.  

 

Figure 1. Flat Plate 3D model ready for FEA

 

Below are the results of the FEA used to predict the first 7 mode shapes of a
24” x 24” x 0.125” flat plate.

Figure 2. First Resonant Frequency @ 15.9 Hz

Figure 3. Second Natural Frequency 16.1 Hz

Figure 4. Third Natural Frequency @ 23.7 Hz

Figure 5. Fourth Natural Frequency @ 31.1 Hz

Figure 6. Fifth Natural Frequency @ 40.5 Hz

Figure 7. Sixth Natural Frequency @ 61.7 Hz

Figure 8. Seventh Natural Frequency @ 75.9 Hz

Figure 9. Animation of Seventh Natural Frequency Mode Shape Deflection

This analysis provides an initial understanding of where the first 6 resonant
frequencies could occur as well as what the mode shapes could look like. If the
results raise concerns about the product’s performance, changes to the design
can be made before any prototype is constructed, reducing production time and
cost.

If a fixture is being designed for use in a vibration test, it is important to
design it in a 3D modeling software and perform FEA on the model to understand
the resonant frequencies and mode shapes of the fixture and how they could
affect the results of the vibration test.

This analysis was performed at Sentek Dynamics’ Charlotte, North Carolina test,
demo, service, and assembly facility. Keep an eye on this webpage for a future
video where this plate is tested on an electrodynamic shaker showing the
resonant frequencies of the plate when tested on a shaker.

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A continuously developing technological field calls for constantly innovating
vibration testing systems. Sentek Dynamics is committed to providing powerful
and efficient solutions for all your vibration testing needs.

For testing inquiries or to schedule a product demo day contact Sentek Dynamics
at https://www.sentekdynamics.com/testing-evaluation-services.

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