Determining harmonic response, part II

Dec. 13, 2001
The Finite-Element Update column in the November 8 issue of MACHINE DESIGN outlined a method for finding stresses and deflections induced by a vibration load.

The Finite-Element Update column in the November 8 issue of MACHINE DESIGN outlined a method for finding stresses and deflections induced by a vibration load. The accompanying flowchart further details the process.

For those readers who would like to try the analysis of the beam, David Dearth, president of Applied Analysis & Technology has provided detailed hand calculations. Readers can request them from [email protected].

In addition, a Word document titled Run Notes & Keystroke Summary and a MSC.Nastran model, also provided, show how to perform the analysis in MSC.Nastran. The model is small enough to process using the limited node or apprentice version of MSC.Nastran V4.6. This software is available from MSC. Software at (714) 444-5188 or from http://vn4w.mscsoftware.com/

The simply supported 36-in. beam has a constant cross section and carries the loads listed.

The flowchart shows how to get from an FEA model to accurate deflections and stress caused by input vibrations. A detailed discussion appeared in last month's Finite-Element Update.

The illustration shows peak deflections and stresses for Case A (neglect beam weight) after being processed using Dynamic Response Analyses to Harmonic Excitation software in MSC.Nastran.

 

About the Author

Paul Dvorak

Paul Dvorak - Senior Editor
21 years of service. BS Mechanical Engineering, BS Secondary Education, Cleveland State University. Work experience: Highschool mathematics and physics teacher; design engineer, Primary editor for CAD/CAM technology. He isno longer with Machine Design.

Email: [email protected]

"

Paul Dvorak - Senior Editor
21 years of service. BS Mechanical Engineering, BS Secondary Education, Cleveland State University. Work experience: Highschool mathematics and physics teacher; design engineer, U.S. Air Force. Primary editor for CAD/CAM technology. He isno longer with Machine Design.

Email:=

Sponsored Recommendations

April 16, 2025
Clean. Compact. Less heat.
April 16, 2025
SEW-EURODRIVE Introduces DR2C motor, IE5 Ultra-Premium Efficiency Motor
March 31, 2025
Unlike passive products - made of simple carbon springs - the bionic prostheses developed by Revival Bionics are propulsive, equipped with a motor and an artificial Achilles tendon...
March 31, 2025
Electric drives are a key technology for the performance of machines, robots, and power tools. Download this guide for an introduction to high-quality mechatronic drive systems...

Voice your opinion!

To join the conversation, and become an exclusive member of Machine Design, create an account today!