Le Dung

5 Questions 22 Answers 0 Followers

Questions related from Le Dung

How can i use "resample" command in matlab to change Bandwidth of a measured signal ?

Hi everyone! Now, i'm reading a book "Noise and vibration analysis" by Anders Brandt. And in this book, the author wrote that we can change bandwidth of a measured signal using resample...

31 October 2017 1,256 6 View

How can we calculate damping loss factor (netar) ?

Now, i'm reading the book " Modal testing theory and practice" by D.J. Ewins. And i have a problem to non-proportional structural damping. With proportional structural damping ([D] = beta*[M] +...

08 July 2017 1,437 16 View

What does locations and number of measurement points on structures depend on?

Hi. When i do a modal test on any structures. So, How many can i select number of measurement points? How can i select locations to put sensors? And, the end, what does they depend on? Thank you.

24 June 2017 6,152 2 View

How is effect of using different damping models in output of a modal analysis ?

Hi. If i do a modal analysis for a structure. And, I use different damping models (such as: viscous damping model, structural damping, and so on.). So, How is effect of using different damping...

16 June 2017 2,400 6 View

How a structure will vibrate when excited at a frequency that isn't anything among natural frequencies of the structure?

When i solve an eigenvalues and eigenvectors (or frequencies and mode shapes) problem of a multiply degrees of free system. I found frequencies of the system: omega1, ơega2, omega3,....,omega n...

24 January 2017 6,938 3 View