Ge Dali, Hong Qingrui, Liu Xin, Liang Haiyi
School of Civil Engineering, Anhui Jianzhu University, Hefei 230601, China.
IAT-Chungu Joint Laboratory for Additive Manufacturing, Institute of Advanced Technology, University of Science and Technology of China, Hefei 241200, China.
Polymers (Basel). 2024 Nov 26;16(23):3298. doi: 10.3390/polym16233298.
Self-oscillation, a control approach inspired by biological systems, demonstrates an autonomous, continuous, and regular response to constant external environmental stimuli. Until now, most self-oscillation systems have relied on a static external environment that continuously supplies energy, while materials typically absorb ambient energy only intermittently. In this article, we propose an innovative self-oscillation of liquid crystal elastomer (LCE) fiber-slide system driven by a self-flickering light source, which can efficiently regulate the energy input in sync with the self-oscillating behavior under constant voltage. This system primarily consists of a photo-responsive LCE fiber, a slider that includes a conductive segment and an insulating segment, a light source, and a conductive track. Using the dynamic LCE model, we derive the governing equation for the motion of the LCE fiber-slider system. Numerical simulations show that the LCE fiber-slide system under constant voltage exhibits two distinct motion phases, namely the stationary phase and the self-oscillation phase. The self-oscillation occurs due to the photo-induced contraction of the LCE fiber when the light source is activated. We also investigate the critical conditions required to initiate self-oscillation, and examine key system parameters influencing its frequency and amplitude. Unlike the continuous energy release from the static environmental field in most self-oscillation systems, our LCE fiber-slide self-oscillation system is driven by a self-flickering light source, which dynamically adjusts the energy input under a constant voltage to synchronize with the self-oscillating behavior. Our design features advantages such as spontaneous periodic lighting, a simple structure, energy efficiency, and ease of operation. It shows significant promise for dynamic circuit systems, monitoring devices, and optical applications.
自振荡是一种受生物系统启发的控制方法，它对恒定的外部环境刺激表现出自主、持续且规律的响应。到目前为止，大多数自振荡系统依赖于持续供应能量的静态外部环境，而材料通常仅间歇性地吸收环境能量。在本文中，我们提出了一种由自闪烁光源驱动的液晶弹性体（LCE）纤维 - 滑块系统的创新自振荡，该系统能够在恒定电压下与自振荡行为同步有效地调节能量输入。该系统主要由光响应性LCE纤维、包含导电段和绝缘段的滑块、光源以及导电轨道组成。使用动态LCE模型，我们推导了LCE纤维 - 滑块系统运动的控制方程。数值模拟表明，恒定电压下的LCE纤维 - 滑块系统呈现出两个不同的运动阶段，即静止阶段和自振荡阶段。自振荡是由于光源激活时LCE纤维的光致收缩而发生的。我们还研究了启动自振荡所需的临界条件，并考察了影响其频率和振幅的关键系统参数。与大多数自振荡系统中静态环境场的持续能量释放不同，我们的LCE纤维 - 滑块自振荡系统由自闪烁光源驱动，该光源在恒定电压下动态调整能量输入以与自振荡行为同步。我们的设计具有自发周期性照明、结构简单、能源效率高和操作简便等优点。它在动态电路系统、监测设备和光学应用方面显示出巨大的潜力。
