I had the opportunity to donate blood recently inside this diesel bloodmobile. The vehicle had an onboard generator to provide electrical power for the lights, refrigerator, and other equipment. The generator produced vibration spectra mainly at ~ 60 and 120 Hz which could be both heard and felt inside the vehicle. I measured both the sound and vibration with my Smartphone.
Here is the Fourier spectrum for the audio calculated over a 20 second window:
The audio recording was made outside the vehicle.
Here is the accelerometer time history set for a brief window as measured inside the vehicle with the Smartphone placed on a console table. The 60 and 120 Hz components are again present.
This prompted me to have a thought that maybe blood donations chairs should have built-in massage vibrators to help the donors relax. Perhaps the vibration would even enhance the blood flow to make the extraction process more efficient.
Whole–body vibration (WBV) as a therapy increases blood circulation in humans, among other beneficial health affects.
– Tom Irvine
Hello, Tom!
Great to hear from you, as always!
I am working at Honeywell in Deer Valley, and am the Principal Mechanical Engineer supporting Military Avionics as well as Commercial Avionics.
I have recently been involved in a number of investigations, qualifications, etc. and continue to spread the word about your awesome tutorials, software, etc.
I am gaining traction in developing a number of mechanical engineers becoming interested in vibration and shock analysis, testing, etc.
I have been actively involved in vibration, shock, data acquisition, troubleshooting, etc. since I took your class around the 2001-2003 timeframe. I have the course material upstairs.
Anyway, a number of my colleagues have a great respect for you and your efforts/products, and our Deer Valley crew is closely tied to the Clearwater Florida site, among others.
I have taken over the Military Avionics site from ABQ, NM and brought the factory, products, test and manufacturing equipment, etc. to Deer Valley.
I believe I have a few ‘project’ ideas you may be interested in supporting, but I would also like to get your thoughts on an online or on-site course series for my junior engineers or engineers who are looking to migrate from their thermal, etc. backgrounds and getting into statics, dynamics and shock analysis and testing.
God Bless you and your family!
Doug 505-310-3620 cell
Doug, Good to hear from you again! I currently live in Kent, WA and am working at Blue Origin. I am unable to provide training or consulting at this time. But you and your colleagues are welcome to browse through the Matlab scripts and training materials posted throughout this blog, especially:
https://vibrationdata.wordpress.com/2013/05/29/vibrationdata-matlab-signal-analysis-package/
Best wishes, Tom