The purpose of this paper is to introduce a systematic method of designing a beam-type vibration absorber that attenuates vibration at multiple frequencies. This vibration absorber is a non-uniform beam with natural frequencies intentionally designed to coincide with or close to the frequencies of excitation, e.g. the rotating speed of a rotary machine and its harmonic orders. Therefore it can reduce the vibration response due to rotor eccentric, rotor shaft bending, mechanical looseness, etc. The thickness profile of the non-uniform beam can be determined systematically using the impedance technique proposed in this paper. A design is given to demonstrate the methodology and the result is experimentally validated.
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