Intelligent active damping for vibration control

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Vibrations in engineering structures in either a terrestrial or a space environment are generally undesirable because they undermine the performance of the structure and could result in structural failure. The traditional method of suppressing structural vibrations is by overlaying the structure with a polymer (rubbery material) that has the ability to dissipate energy. Further improvements in the degree of vibration suppression occurred in the late 1950s when the polymer was sandwiched between the structure and another layer of material called the constraining layer. The means by which these techniques work are generally referred to as passive vibration damping (PD) and passive constrained layer vibration damping (PCLD), respectively.