Huh Jong-Hoon, Higashi Takumu, Sato Yuki
Department of Physics and Information Technology, Faculty of Computer Science and Systems Engineering, Kyushu Institute of Technology, Fukuoka, 820-8502, Japan.
Sci Rep. 2024 Sep 18;14(1):21821. doi: 10.1038/s41598-024-71897-z.
Noise can play a constructive role in nature and various engineering systems. Over the past four decades, noise-induced stochastic resonances (SRs) have been extensively documented, showing enhancement in system performance. Additionally, inverse SR has been observed in various systems. Typically, these resonances were studied independently. A transition between these resonances was recently observed in an alternating current-driven liquid-crystal electroconvection (EC) system using combined amplitude and phase noises. This study uses internal (material) and external (noise) parameters to demonstrate the control of this transition. Specifically, the nonmonotonic threshold voltage behavior of the EC system, indicative of the resonances, was numerically examined using additional parameters. Experimental tests were conducted to confirm the effects of these parameters. The findings reveal that the transition between these resonances can be systematically controlled to meet specific needs, whether desirable or undesirable system performances. Notably, this study illustrates how to modify the behavior of both resonances in colored noise by adjusting its cutoff frequency and steepness and phase noise, which is often overlooked. Moreover, this study provides valuable insights for various noise-related applications.
噪声在自然界和各种工程系统中可以发挥建设性作用。在过去的四十年里，噪声诱导的随机共振（SRs）已被广泛记录，表明系统性能得到了增强。此外，在各种系统中也观察到了逆SR。通常，这些共振是独立研究的。最近，在一个使用组合幅度和相位噪声的交流驱动液晶电对流（EC）系统中观察到了这些共振之间的转变。本研究使用内部（材料）和外部（噪声）参数来证明对这种转变的控制。具体而言，使用额外的参数对EC系统的非单调阈值电压行为（表明共振）进行了数值研究。进行了实验测试以确认这些参数的影响。研究结果表明，这些共振之间的转变可以被系统地控制，以满足特定需求，无论是期望的还是不期望的系统性能。值得注意的是，本研究说明了如何通过调整有色噪声的截止频率、陡度和相位噪声（这一点常常被忽视）来改变两种共振的行为。此外，本研究为各种与噪声相关的应用提供了有价值的见解。
