Abstract The black hole equipment or concentrator plays an important role in harnessing the wave energy, which has the potential application in the energy collecting engineering. In this work, we propose a broadband flexural wave black hole equipment or concentrator which is designed by the coordinate transformation method and active control systems. The concentrator with 48 alternative sectorial layers has a good concentrating performance. The polydimethylsiloxane (PDMS) and piezoelectric transducer (PZT) patches connected by external electrical circuits are used as the active components of the flexural wave concentrating configuration. By finite element simulations and experiments, the results show that the effective frequency region of the flexural wave concentrator without the active control systems is from 800 Hz to 1500 Hz. In addition, a wider frequency region of the concentrating performance from 800 Hz to 2000 Hz can be obtained by the active control system connected with external resistors and negative capacitor circuits. Furthermore, experiments are performed to show the excellent agreement with the numerical predictions.

中文翻译：

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弹性超材料板中弯曲波的黑洞或集中器的主动控制

摘要 黑洞设备或集中器在利用波浪能方面发挥着重要作用，在能量收集工程中具有潜在的应用价值。在这项工作中，我们提出了一种通过坐标变换方法和主动控制系统设计的宽带弯曲波黑洞设备或集中器。具有48个交替扇形层的聚光器具有良好的聚光性能。通过外部电路连接的聚二甲基硅氧烷 (PDMS) 和压电换能器 (PZT) 贴片用作弯曲波集中配置的有源组件。通过有限元仿真和实验，结果表明，没有主动控制系统的弯曲聚波器的有效频率范围为800 Hz至1500 Hz。此外，通过外接电阻和负电容电路的主动控制系统可以获得800Hz到2000Hz的较宽的集中性能频率范围。此外，进行了实验以显示与数值预测的极好一致性。