Modal Analysis

Understanding the natural frequencies and mode shapes of a component or structure are key requirements to the efficient design of mechanical systems.  Used as a tool for initial concept design, modal analysis allows DJHEC to produce designs that avoid the frequencies generated by tracked or wheeled mobile equipment during their operation. Additionally, higher frequency requirements generated by internal components such as engines or transmissions are considered when designing components that may be effected by their vibration. Considering this important design requirement allows for the avoidance of premature component failure.

Utilizing time history data of a physical tested product, DJHEC has the ability to generate Power Spectrum Density (PSD) plots through nCode to identify critical frequencies during the machine operation. By understanding the frequencies and mode shapes produced from modal analysis, accuracy of test results and analysis can be verified and the component stiffness can be adapted to avoid failure at these critical frequencies.

Additionally, the modal response of a structure is required for modal dynamic superposition. For more information related to this subject, refer to the Dynamic Modal Superposition page.

While relatively easily to perform, understanding the the broad capabilities of modal analysis along with interpreting how mode shapes and frequency response impact a design are key to project success. DJHEC has the tools and experience required to determine if your product may be prone to frequency response issues.

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     Mode Shape and Frequency Response of Bracket                  PSD Plot of Bracket Illustrating Critical Frequencies