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SOUND DEPERVATION IN ADVANCED COMPOSITE STRUCTURES

ideally suited to the retrofit markets for the following reasons: Very lightweight  Thin  Broad B and performance  Affordable  Easy to apply  Easily field repairable  Increased structural integrity and increased environmentally durability  Multiple loss mechanisms (magnetic and eddy current) PIFRAM absorbers are a series of thin, flexible, broadband absorbers, which reflect 10 dB or more over an 8 GHz bandwidth, and 15 dB or more over a 6 GHz bandwidth in the 2 – 18 GHz range. The material is comprised of a matrix of urethane rubber filled with a novel absorber type known as PIFRAM. PIFRAM absorbers will withstand temperatures from -50- 265 F (-68 C - 130 C). It can be bonded to flat or curved metal surfaces to reduce the reflectivity in a broad band of frequencies. Proper use of PIFRAM absorbers requires that it be backed by a metal surface. They are ideally suited to applications requiring a very thin lightweight microwave absorber where broadband performance is essential.PIFRAM absorbers are available in sheets from 30 cm x 30 cm, to, 1 meter x 20 meters with varying weights depending on the desired frequencies covered. The exterior face can be painted with standard aircraft qualified paints. Material can also be supplied in other sizes, custom shapes and with pressure sensitive adhesive tape.The life span for a current platform, from design to retirement, may reach 35 years. During these years, the platform will be significantly upgraded 2 or 3 times.Plans for the second generation PIFRAM included that the ideal absorber would be of negligible weight and thickness, easily applicable to any complex structure and attenuate electromagnetic energy over a broad range of frequencies. New PIFRAM markets are few and far between. The life-span for a current platform, from design to retirement, may reach 35 years. During these years, the platform will be significantl...

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