论文标题
阻尼驱动系统的通用动力学:逻辑图作为能量平衡的正常形式
Universal Dynamics of Damped-Driven Systems: The Logistic Map as a Normal Form for Energy Balance
论文作者
论文摘要
阻尼驱动的系统在工程和科学方面无处不在。尽管在广泛的应用中观察到的物理过程多种多样,但实际上在实践中观察到的潜在不稳定性具有普遍的特征,这取决于给定系统的总体增益和损失曲线。抑制驱动系统的普遍行为可以从对能量平衡的几何描述中以最少的假设来理解。能量动力学的假设如下:能量随着增益的增加而单调增加,并且随着能量的增加而损失越来越大,即系统中有许多耗散途径,用于大型输入能量。增益曲线的交点定义了能量平衡的解决方案。通过在损耗和增益曲线之间构造迭代图,可以证明该动力学是对逻辑图的同构,该图表表现出将级联变成混乱的时期。实际上,损耗和增益曲线允许通过简单的Verhulst图(蜘蛛网图)对动力学进行几何描述。因此,无论物理学及其复杂性如何,这种简单的几何描述决定了在复杂的阻尼驱动系统中出现的逻辑图不稳定性集。更广泛的是,阻尼驱动的系统是一类非平衡模式形成系统,这些系统具有一组规范的不稳定性,这些系统在实践中显现出来。
Damped-driven systems are ubiquitous in engineering and science. Despite the diversity of physical processes observed in a broad range of applications, the underlying instabilities observed in practice have a universal characterization which is determined by the overall gain and loss curves of a given system. The universal behavior of damped-driven systems can be understood from a geometrical description of the energy balance with a minimal number of assumptions. The assumptions on the energy dynamics are as follows: the energy increases monotonically as a function of increasing gain, and the losses become increasingly larger with increasing energy, i.e. there are many routes for dissipation in the system for large input energy. The intersection of the gain and loss curves define an energy balanced solution. By constructing an iterative map between the loss and gain curves, the dynamics can be shown to be homeomorphic to the logistic map, which exhibits a period doubling cascade to chaos. Indeed, the loss and gain curves allow for a geometrical description of the dynamics through a simple Verhulst diagram (cobweb plot). Thus irrespective of the physics and its complexities, this simple geometrical description dictates the universal set of logistic map instabilities that arise in complex damped-driven systems. More broadly, damped-driven systems are a class of non-equilibrium pattern forming systems which have a canonical set of instabilities that are manifest in practice.