Vibration Control of Rotating Plates and Translating Bands

这个项目解决了机器中的三个基本问题 动力学，其解决方案在设计高 材料加工和计算机的生产力机器 行业 三个研究课题是（1）超临界转速 旋转板，（2）阻尼，非对称，高速， 承受固定滑动轴承的旋转圆板 系统，以及（3）高速带（带， 纤维、带和锯）。 第一个主题的影响将在计算机磁盘驱动器和 圆锯机 目前的系统使用亚临界速度 以避免低频激励引起的振动波共振。 超临界速度板受到气动弹性颤振的影响， 从而限制了它们的使用。 超临界速度板将 这意味着生产力的提高，这项研究旨在确定 转盘的最大运行速度。 第二个问题涉及一类系统，包括 计算机磁盘驱动器、圆锯机和盘式制动器转子。 板/滑块系统在亚临界和临界温度下可能是不稳定的。 超临界速度 这项研究开发了一个完整的 对轴对称板/滑块稳定性的理解 系统. 第三个研究问题涉及一类系统， 包括数字存储磁带、传动带、带锯、有轨电车 电缆、纺织品、纸卷和新闻纸。 增强 生产率可能与更高的运输速度，但更高 速度还导致横向振动，这可导致降低的 准确性甚至系统故障。 这项研究提供了 通过开发分布式线性振动控制， 利用横向力使材料轴向移动 执行器和张力控制。

This project addresses three fundamental problems in machine dynamics whose solutions are important in the design of high productivity machines in the material processing and computer industries. The three research topics are (1) supercritical speed rotating plates, (2) vibration of damped, asymmetric, high speed, rotating circular plates subjected to a stationary slider bearing system, and (3) vibration and stability of high speed bands (tapes, fibers, belts, and saws). The first topic's impact will be in computer disk drives and circular sawing machines. Current systems use subcritical speed to avoid resonance of vibration waves by low frequency excitations. Supercritical speed plates are subject to aeroelastic flutter and thereby limited in their use. Supercritical speed plates would imply gains in productivity, and this research seeks to determine the maximum operating speed of a rotating plate. The second problem addresses a class of systems which includes computer disk drives, circular sawing rigs, and disk brake rotors. The plate/slider system can be unstable at subcritical and supercritical speed. This research develops a complete understanding of the stability of axisymmetric plate/slider systems. The third research problem addresses the class of systems which includes digital memory tapes, drive belts, band saws, tramway cables, textiles, paper rolls, and newsprint. Enhanced productivity is possible with higher transport speed, but higher speed also leads to transverse vibration which can lead to reduced accuracy and even system failure. This research provides for higher speeds by developing linear vibration control of distributed axially moving materials through the use of transverse force actuators and of tension control.