Shock and vibration analysis can be performed either in the frequency or time domain The time domain method requires more computation time but is much better suited for transient and nonstationary excitation Time domain methods are also better for rainflow … Continue reading
The punch file method may be used to extract the mass & stiffness matrices from Nastran models. The format is awkward since zero terms are not stored. Also the matrices are assumed to be symmetric, and the upper triangular portion … Continue reading
Here is a Matlab script that converts a time history to a format which can be input to Femap or some other preprocesser for Nastran analysis. time_history_nastran.m with supporting function: datafix.m It can be used for force, pressure, acceleration or … Continue reading
Here are some edited notes given to me by a colleague who is writing software programs to import Nastran data into Matlab. DMAP DMAP (Direct Matrix Abstraction Programming) is the language running under the hood in the various nastran solution sequences. … Continue reading
We will meet via Zoom on January 20, 2024 from 7:00 AM to 8:30 PM US Central Time. Attendees may “come and go.” The link is given below. This will be a good opportunity for university students to present their research. Professional … Continue reading
This post is mostly for my university professor and graduate student friends. But everyone is welcome to respond. I have an idea for a master thesis research project which would be of great service to industry. I want to do this … Continue reading
For the past eight years, I have written a required monthly status report to another organization for my NASA contractor work. I have written my accomplishments and planned work in short, concise sentences, usually in numbered list format. I was … Continue reading
Structural Analysis Engineer – Loads & Dynamics 3/4 ApplyJob ID 1600001438Date posted 01/29/2016 Location Huntsville, Alabama, United States Job Description The Space Launch System (SLS) program with NASA will restore the nation’s capability in manned access to space, including destinations beyond Earth … Continue reading
Please send me an Email if you are going to use this package. Also, you are welcome to participate in the Shock & Vibration courses. Thank you,Tom IrvineEmail: tom@irvinemail.org * * * License information: The software packages on the following … Continue reading
Vibrationdata 