Inverse structural modifications of a geared rotor-bearing system for frequency assignment using measured receptances

To address the lack of experimental validation to inverse structural modification problems in published papers, a geared rotor-bearing system is manufactured and tested to validate the method and provide experimental insights. Experimental results show that more than one natural frequency or antiresonant frequency can be assigned within acceptable accuracy and the sensitivity of modifications is crucial for the solutions of modifications cast as an optimization problem. An additional application for determining the optimal locations for given modifications to achieve the highest first natural frequency is also presented. The experimental results obtained prove the effectiveness and the ease of use of this proposed method. This work should help make inverse structural modification a popular means of passive vibration control to improve the dynamical behaviour of real structures.