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首页> 外文会议>Conference on Active and passive smart structures and integrated systems; 20090309-12; San Diego, CA(US) >Light weight polarized polypropylene foam for noise shielding
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Light weight polarized polypropylene foam for noise shielding

机译：轻质偏光聚丙烯泡沫，可屏蔽噪音

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摘要

The high levels of noise generated during launch can destroy sensitive equipment on space craft. Passive damping systems, like acoustic blankets, work to reduce the high frequency noise but do little to the low frequency noise (<400 Hz). While wall mounted transducers can reduce the low frequency noise during a launch, they also can create areas of higher increased sound pressure in the payload fairings. Ferroelectret cellular polymer foams with high piezoelectric coupling constants are being used as new types of actuators and sensors. Further impedance control through the inverse piezoelectric effect will lead to a new "semi-active" approach that will reduce low frequency noise levels. Combining layers of conventional nonpiezoelectric foam and ferroelectret materials with a multiple loop feedback system will give a total damping effect that is adaptable over a wide band of low frequencies. This paper covers the manufacturing methods that were used to make polarized polypropylene foam, to test the foam for its polarized response and its noise shielding ability.
机译：发射过程中产生的大量噪声会破坏航天器上的敏感设备。被动阻尼系统（如隔音毯）可减少高频噪声，但对低频噪声（<400 Hz）影响很小。壁装式换能器可以降低发射过程中的低频噪声，但它们也可以在有效载荷整流罩中产生更高声压的区域。具有高压电耦合常数的铁电驻极体多孔聚合物泡沫被用作新型的执行器和传感器。通过逆压电效应进行的进一步阻抗控制将导致一种新的“半主动”方法，该方法将降低低频噪声水平。将传统的非压电泡沫材料和铁电驻极体材料层与多回路反馈系统结合使用，将产生总的阻尼效果，可在宽范围的低频范围内适应。本文介绍了用于制造偏光聚丙烯泡沫的制造方法，以测试该泡沫的极化响应和噪声屏蔽能力。

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