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Vibration transmission in electronic packages having structurally complex design

The paper demonstrates that vibration sustained by electronic packages while their operation or tests cannot be characterized by vibration measured either on their supporting base or on the shaker transmitting this vibration. The theoretical model of the oscillating system representing electronic unit installed on the support subjected to vibration is described. Vibration transmission from the shaker to the tested electronic unit is explained as the complex problem to solve. The experimental measurement of vibration conducted inside of tested electronic units verified significant difference in amplitude of vibrations transmitted inside the units and external vibrations that units are exposed to.