Vibration Control of Rotating Plates and Translating Bands

该项目研究了三个重要的基本问题， 机器动力学和高生产率机器的设计 材料加工和计算机工业。 它们是：1） 自由中心高速旋转圆板的振动 2)超临界转速旋转板; 3）高转速下的振动 速度带：磁带，驱动带和锯。 问题1的自由中心盘沿沿着定位， 通过作用在板的表面上的流体轴承来驱动主轴。 它对产品尺寸实现了出色的控制， 大大减少了切割残留物。 的机制 机器是未知的。 观测到灾难性的不稳定， 陀螺仪进动，以及控制板块在 主轴在运转过程中所受的驱动与轴承有一些 的重要问题， 都得到了解决。 在问题2中，超临界速度旋转圆板 以比不稳定时预期的速度更高的速度旋转，即， 临界速度。 磁盘驱动器和圆形磁盘驱动器的设计师 锯床目前将运行速度设置为 远低于临界速度。 的限制 限制了潜在的巨大机会， 生产效率高，速度快。 这个问题必须 以足够的精度和深度接近， 确定了不稳定的原因，稳定的速度窗口 操作进行了观察，并提出了可能的技术解决方案， 的不稳定性问题进行了评估。 问题3中的平移带切割材料， 人和产品，并传递信息。 高功率运行 高精度的速度需要了解 系统的力学和振动控制的实施。 本文建立了一个纵向和横向耦合振动的模型， 在没有耗散的情况下，现在必须 扩展到包括耗散。 它可以用来预测 振动的被动和实时控制。

The project investigates three fundamental problems important to machine dynamics and the design of high productivity machines in material processing and computer industries. They are: 1) Vibration of Free Center, High Speed Rotating Circular Plates; 2) Supercritical Speed Rotating Plates; and 3) Vibration of High Speed Bands: Tapes, Drive Belts, and Saws. The free center plate of Problem 1 is positioned along a splined drive spindle by fluid bearings acting on the faces of the plate. It achieves remarkable control over product dimension and dramatically reduces cutting residual. The mechanics of the machine is not known. Observed catastrophic instabilities, gyroscopic precessions, and control of the plate position on the spindle during operation by driving with the bearings are some of the important issues which are addressed. In Problem 2, the supercritical speed rotating circular plate spins at a higher speed than that expected at instability, i.e., the critical speed. Designers of disk drives and circular sawing machines currently set the operating speed to substantially less than the critical speed. The restriction limits the potentially enormous opportunities for increased productivity from high speed on both. The problem must be approached with sufficient precision and depth so that the causes of instability are identified, speed windows for stable operation are observed, and possible technological solutions to the instability problem are evaluated. The translating bands in Problem 3 cut materials, transport people and products, and transmit information. Operation at high speeds with high precision requires understanding of the mechanics of the system and implementation of vibration control. A model of the coupled longitudinal and transverse vibration of a band and wheel system in the absence of dissipation must now be extended to include dissipation. It can be used to predict passive and real-time control for vibration.