current technology developed using a test rig such as the one introduced, proved to be correct when used for testing lightly damped materials, which require relatively small excitation forces. When the damping is higher, as for composite materials, the excitation force must be increased. A tuneable test rig is an excellent mechanical amplificator of vibrations but, when wrongly implemented, it can result shaker underperforming or performing outside its specifications. A mechanical amplificator should be connected to a shaker using a mechanism with high impedance so that the armature REFERENCES [1] B A Cowles, High cycle fatigue in aircraft gas turbines- an industry perspective. International Journal of Fracture 80:147-163, 1996 512
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