Random Vibration Tests and Screens

Have you been seeking a random vibration test standard to follow? Worldwide, the most widely used has been MIL-STD-810. I mentioned its history in ebook 18. The “G” version was finally released in October 2008. It can be downloaded from the Internet.
Future USA military use of USA MIL standards is not clear. In commercial work, 810 is being replaced by commercial standards. Increasingly, the International Electrotechnical Commission (IEC) standards are being used. For wideband random vibration testing, see IEC 68-2-34 and -36.
Ebook 23 discusses the terminology and how we interpret standards and test plans. Now let’s examine how we (or rather our computers) perform random vibration tests. Let’s also consider intense noise testing.
Ebook 23 is not quite complete. Section 23.6 awaits video clips from controller manufacturers, showing the ease of starting a random vibration test on their controllers.

TABLE OF CONTENTS:

23.1 Random vibration test practice
23.2 What are the control tasks?
23.3 Analog control
23.4 Why study old analog technology?
23.5 Commonality amongst digital shaker controllers
23.6 Differences between digital shaker controllers
23.7 Time history replication
23.8 Data acquisition
23.9 Test spectrum based upon field data
23.10 Averaging over time
23.11 “Real world” data not stationary
23.12 Much realism is lost
23.13 Time history replication further promoted
23.14 Shaker compensation
23.15 Forget about PSD
23.16 Can shaker motion match field experience?
23.17 Varying intensity
23.18 What if I must test to a spectrum?
23.19 Sine-on-Random (SoR) tests
23.20 Narrowband Random-on-Random (RoR)
23.21 Unwanted high-frequency vibration
23.22 Remote shaker control
23.23 Gunfire testing