The purpose of this study is to experimentally determine the behavior of structural plates with elastically suspended vibration absorbing plates attached. Three major factors under study are mass of the vibration absorber, stiffness of the elastic connectors, and flexural rigidity of the vibration absorbing plate.
The single panel simply supported square plate is tested to determine the vibration attenuation effects of three different vibration absorbers. These vibration absorbers are also square plates and are suspended by springs at the four corners.
The tests were conducted with a custom designed and con- structed model and testing frame and standard structural dynamics laboratory equipment. A data acquisition system consisting of a personal computer with an analog-to-digital converter was used. The experimental results were compared to theoretical and numerical analyses and experimental modeshapes were determined.
The results show that heavy vibration absorbers, i.e., weight of the secondary plate greater than one-half the pri- mary plate weight, shift the fundamental and lower order primary plate natural frequencies. Absorber plates about one half the weight of the primary plate tend to have a wide range effect. Lightweight absorbers, i.e., less than one- half the primary plate weight, affect higher order primary plate frequencies. The elastic connectors serve to fine tune the system to a desired effect. Secondary plate flex- ion has little affect on the behavior.