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首页> 外文会议>Smart Structures and Materials 1997: Mathematics and Control in Smart Structures >Control of sound radiation from a plate into an acoustic cavity using active piezoelectric-damping composites
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Control of sound radiation from a plate into an acoustic cavity using active piezoelectric-damping composites

机译：使用有源压电阻尼复合材料控制从板到声腔的声辐射

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Abstract: Sound radiation from a plate into an acoustic cavity is controlled using patches of active piezoelectric-damping composites (APDC). The APDC, under consideration, consists of piezoelectric fibers embedded across the thickness of a visco-elastic matrix in order to control the compressional damping characteristics of the composite. The effectiveness of the APDC treatments in attenuating the sound radiation from thin plates into cavities is demonstrated theoretically and experimentally. A finite element model (FEM) is developed to describe the dynamic interaction between the plate, the APDC patches and the acoustic cavity. The FEM is used to predict the dynamics of the plate/acoustic cavity and the sound pressure distribution for different control strategies. The predictions of the FEM are validated experimentally using a square aluminum plate whose sides are 29.8 cm and thickness of 0.04 cm. The plate is mounted on a 29.8 cm $ MUL 29.8 cm $MUL 75 cm cavity. The test plate is treated with a single APDC patch placed at the plate center. The patch is 5 cm $MUL 5 cm $MUL 0.03125 cm which is made of 15-25 percent lead zirconate titanate fibers embedded in soft and hard polymeric resin matrices and provided with silver-epoxy electrodes. Vibration and sound pressure level attenuations of about 70 percent are obtained a the plate/cavity first mode of vibration, with a maximum control voltage of 330 volts using a derivative feedback controller. Such attenuations are attributed to the effectiveness of the APDC treatment in increasing the modal damping ratios by about a factor of four over those of conventional passive constrained layer damping treatments. Comparisons between the theoretical predictions of the FEM with the experimental results indicate close agreement between theory and experiments. The obtained results suggest the potential of the APDC treatments in controlling the sound radiation from plates into acoustic cavities. Such potential can be exploited in many critical applications such as cabins of aircrafts and automobiles to ensure quiet environment for the occupants. !24
机译：摘要：使用主动压电阻尼复合材料（APDC）的贴片控制从板到声腔的声音辐射。考虑中的APDC由嵌入在粘弹性基质厚度上的压电纤维组成，以控制复合材料的压缩阻尼特性。从理论上和实验上证明了APDC处理在减弱从薄板到腔中的声辐射方面的有效性。建立了有限元模型（FEM）来描述板，APDC贴片和声腔之间的动态相互作用。有限元法用于预测板/声腔的动力学以及不同控制策略下的声压分布。 FEM的预测通过使用方形铝板进行了实验验证，该铝板的侧面为29.8厘米，厚度为0.04厘米。将该板安装在29.8 cm MUL 29.8 cm MUL 75 cm的腔体上。用放置在板中心的单个APDC贴片处理测试板。贴片为5厘米$ MUL 5厘米$ MUL 0.03125厘米，由15％至25％的锆酸钛酸铅纤维嵌入软，硬聚合物树脂基体中制成，并配有环氧银电极。板/腔第一振动模式可获得约70％的振动和声压级衰减，使用微分反馈控制器具有330伏的最大控制电压。此类衰减归因于APDC处理在将模态阻尼比提高到比常规被动约束层阻尼处理高大约四倍的情况下的有效性。 FEM的理论预测与实验结果之间的比较表明理论与实验之间有着紧密的一致性。获得的结果表明，APDC处理在控制从板到声腔的声辐射方面的潜力。可以在许多关键应用中利用这种潜力，例如飞机和汽车的机舱，以确保乘员的安静环境。 ！24

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