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Re: ODS Analysis

From: Arne
Remote Name: 217.210.179.50

Comments

I am sure with you, Skip, but maybe it is much easier to just let the sensor stand on the floor using some simple adhesive. For instance double sided tape for carpets. Or the sticky clay used to attach posters to a wall or door. The primary goal is to ensure that the sensor will move in full with the floor under test for all the range of frequency you want to cover plus -my suggestion- at least 50 percent. I have bumped a rather large floor for CNC machines using a 10 kg steel scrap block with three welding dots as feet (approx. distance 5 inches in triangle) and the sensor standing on top with a magnet foot. That worked fine to the intended 80 Hz. Most concrete floors have steel reinforcement near to the surface and a fat magnet can give enough force to allow a simple magnet foot to avoid rocking. A stinger, a rod extension to a sensor, is normally so stiff in the axial direction that it has resonances well above any mode of interest of a fat floor. But pay attention to the contact point to the floor. A sharp point is softer than you think. A rounded is better. You should always test the system you want to use on a point that is very very stiff and large and gently tap the sensor top and study the resonances that you get. All should be well above the range of interest. Good luck, regards Arne

Last changed: October 16, 2007