Multi shaker modal testing using a modified transient random excitation

A modal testing method which includes multishaker and transient random modal testing procedures is described. The force and response functions of the testing method are improved with digital-to-analog-converter-driver software and a modified excitation function. The method is applied to a model of a fighter aircraft being tested under transient random single and dual point excitations, true random dual point excitation, and modified transient random dual point excitation conditions. The frequency response and coherence functions are evaluated. It is noted that this method provides improvements in the transfer function and coherence.