Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Daejeon, 34141, Korea.
Sci Rep. 2023 Apr 3;13(1):5453. doi: 10.1038/s41598-023-32261-9.
Conventional active noise control (ANC) systems in enclosed spaces are not easy to implement experimentally because they require a large number of microphones to measure sound pressure in global areas. Even if such systems are possible, if there are any changes in the locations of noise sources or surrounding objects, or if ANC system moves to another enclosed space, an expensive and time-consuming experimental calibration is again required. Implementation of global ANC in enclosed spaces is thus difficult. Therefore, we designed a global ANC system that can be used in various acoustic environments. The main idea involves suboptimal open-loop controller design in the free field. By using an open-loop controller, a controller calibrated once can be used in various acoustic environments. A controller designed in the free field derive a suboptimal solution without bias toward a specific acoustic environment. For controller design in the free field, we propose an experimental calibration approach in which the arrangement and the number of control speakers and microphones are determined by the frequency range and radiation pattern of the noise source. We conducted simulations and experiments to show that the designed controller in the free field is sufficiently effective in other enclosed spaces.
传统的封闭空间中的有源噪声控制 (ANC) 系统不易在实验中实现，因为它们需要大量麦克风来测量全局区域的声压。即使这些系统是可能的，如果噪声源或周围物体的位置发生任何变化，或者 ANC 系统移动到另一个封闭空间，仍然需要昂贵且耗时的实验校准。因此，在封闭空间中实现全局 ANC 是困难的。因此，我们设计了一种可以在各种声学环境中使用的全局 ANC 系统。主要思想涉及在自由场中进行次优开环控制器设计。通过使用开环控制器，一次校准的控制器可以在各种声学环境中使用。在自由场中设计的控制器在没有偏向特定声学环境的情况下得出次优解。对于自由场中的控制器设计，我们提出了一种实验校准方法，其中控制扬声器和麦克风的布置和数量由噪声源的频率范围和辐射模式决定。我们进行了模拟和实验，以表明在其他封闭空间中设计的自由场控制器是足够有效的。
