Damping of Dynamic Systems by Means of Thin Fluid Layers and Jet Flow Impingement.

本文研究了薄流体层和射流冲击对动力系统阻尼的影响。在追求更高的效率和生产力的过程中，机械系统中的振动日益成为一个抑制因素，这些因素通常转化为速度的增加和重量轻的移动部件。在早期的工作中，首席研究员已经证明，通过使用流体层获得的阻尼在低频时特别有效。本项目在早期工作的基础上进行扩展，并试图增强其所达到的阻尼效果。这里研究了两个主题，包括边缘效应和自由射流冲击效应。对于第一个主题，将努力使边缘效应（稳定涡和射流）成为阻尼的主要贡献者。对于第二个主题，计划是研究振动表面与撞击其上的自由射流相互作用所产生的阻尼。该项目包含一个实验部分，以验证研究的分析方面。

This research deals with damping of dynamic systems by means of thin fluid layers and jet flow impingement. Vibration in mechanical systems is an increasingly inhibiting factor in the quest for higher efficiency and productivity, factors which often translate as increased speed and light weight moving components. In earlier work, the principal investigator has demonstrated that damping obtained through the use of fluid layers is particularly effective at low frequencies. This project expands on that earlier work and attempts to enhance the damping effects achieved therein. Two topics are investigated here, comprising edge effects and free jet impingement effects. For the first topic, an effort will be made to make the edge effects (steady vortex and jetting) a dominant contributor to the damping. For the second topic, the plan is to study the damping resulting from the interaction of a vibrating surface with free jets impinging on it. The project contains an experimental component to verify the analytical aspects of the research.