Development in Ground Vibration Test and Data Analysis Techniques for Airframe Structures

A review is given of recent developments in airframe ground vibration test and data analysis methods. Technological advancements in data acquisition and processing which have resulted in greatly improved data quality and quantity are discussed. Data analysis methods are shown to accurately identify complex (i. e. nonproportionally damped) modal parameters from frequency response data. Applications of modal models identified through the testing process are presented, including an example of the Structural Dynamic Modification method. applied to UH-60A ground vibration data.