THE MECHANICAL IMPEDANCE CONCEPT IN VIBRATION DESIGN OF MISSILE ELECTRONIC EQUIPMENT,

A realistic description of the vibration environment seen by missile and satellite electronic equipment can be obtained by performing structural impedance measurements. Present engineering methods assume that the electronic packages are mounted on an infinite impedance source. This approach, however, often leads to misinterpretation of telemetry data and unrealistic testing by environmental specifications. Recommendation for the development of a structural impedance measuring system which can be employed on lightweight missile structures is made on the basis of a state-of-the-art survey of present day equipment and measurement methods. The significance of mechanical impedance measurements is presented with respect to development of realistic environmental specifications and the design and qualification of missile electronic equipment and equipment support structure. Author