Reaction Vibration Forces 2

[static12]

We are multi-discipline manufacturing company of chiller and pump packages. We typically do not do foundation design – we just provide reaction table (dead, live, wind, snow and earthquake load) for our packages. Customer on our last project is asking us to provide reaction vibration forces. Any idea how to accomplish this would be greatly appreciated.

 

[swearingen]

You have to make assumptions on what the foundation is to give reaction forces. Since you don't have control over the foundation, you should provide some basic vibration information and let the foundation engineer incorporate that into his design.

In the industrial structures industry I work in, one of the biggest gripes we get from clients is excessive vibration of a foundation or structure from a piece of rotating or reciprocating equipment.

It's rare that we get this data, but you could alleviate some of the heat from your company when the client complains about vibration by providing the following to the foundation engineer: operating frequencies, mass, center of mass, center of rotating mass, 3-axis phase angles of the vibrations, and accurately dimensioned bolt hole size and spacing.

As a Value-Added item, you could sell the option of vibration isolators mounted to your machines. The data above is still required, but also include the damping of your isolators.

 

[SlideRuleEra]

For general information go to my web page, at the link below, and look in the "Foundation Design" section of the homepage - there are three documents that may be of interest.

http://www.SlideRuleEra.net