Vibration Experiment. Equipment and Setup

[D678]

I am trying to set-up an experiment to measure vibrations on different surfaces and how connected surfaces react; I need some advice on the correct equipment and how to set-up the experiment.

I need between 3 and 5 vibrating pads, these need to be approximately 10 to 30 mm diameter and be able to vibrate at different frequencies. These all need to be linked to a signal generator of some sort, I would like to use an oscilloscope but this may be too expensive.

I need help sourcing the equipment and how to link everything together. I have a small budget. I have attached a very basic drawing of the equipment needed.

Thank you

 

[CWatters]

Perhaps use loudspeakers? or do you need to be able to measure the vibration?