I am trying to understand a ventilation module here. It contains six fans, and it is attached through anti-vibration mounts. The fans are capable of disturbing the system that is being cooled. I am assuming that the fans all do not run at exactly the same speed, so there should some sort of beat frequency. I have modeled and graphed this in Excel and I can see beat amplitudes varying at somewhere between around 5Hz to around 1/10Hz. The actual vibration is at about 50Hz. I am accounting for centrifugal force. If the vibrations are at the frequency of the impeller blades, things are way more complicated.
Are these beat amplitudes equivalent to vibrations, or is this just a 50Hz system with varying amplitude?
Red Flag Submitted
Thank you for helping keep Eng-Tips Forums free from inappropriate posts. The Eng-Tips staff will check this out and take appropriate action.
Reply To This Thread
Posting in the Eng-Tips forums is a member-only feature.
PCB design is a purposeful process. In essence, every PCB design is a complex puzzle that requires a designer to incorporate critical components and tight schematics into a piece of technology that is governed by rules, constraints and industry standards. Download Now