Effects of shaker, stinger and transducer mounting on measured frequency response functions

摘要

Electrodynamic shakers are utilized in many experimental modal tests and general structural dynamic testing. The physical aspects of shaker, stinger and transducer setup can result in anomalies that are often misunderstood. Many times measurement artifacts related to mounting and dynamic coupling between shaker, stinger and test object can appear, affecting test results. This paper overviews some of the common problems that are typically encountered. Measurements are made on several structures to better demonstrate the effects of these issues. These include shaker alignment, stinger selection, reciprocity and other practical concerns that must be clearly understood in order to make the best possible overall measurements.