Abstract
This report introduces a new concept in complex modulus measurements of highly rigid and damped specimens. The technique exploits this very undesirable feature to create ideal test conditions, namely uncoupled modes of vibration without having to pre-empt a particular regime of energy dissipation for data deduction purposes. A completely symmetric two degrees of freedom system results in orthogonal principal coordinates hence fulfilling this condition. Acting as a mechanical amplifier it dynamically isolates the rig from the surroundings whilst considerably reducing the size of the shakers. The first mode is employed for measuring the extraneous effects as well as calibrating the instruments whilst the second mode is used for the actual measurements. A brief description of design features of the apparatus capable of both free and forced vibration measurements, together with an account of its effectiveness in a real life situation is also presented.
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