Analytical Methods for Modeling of Vibration and Noise of Ultra High Performance Machine Systems

目前，对机器系统动态行为建模能力的限制常常导致性能降低。该项目解决了这一限制，并专注于高性能、高生产率机器系统的动力学和振动的分析设计模型的开发。它将以前开发的建模技术扩展到更一般的机器配置，包括支撑结构，机器外壳和几种类型的间隙连接。将制定动态模型，以便将来与预测机器噪声的声学分析技术相结合。本研究考察了简单和复杂的动态模型，并对模型进行了实验评价。挡板冲击梁是一个简单模型的例子。它包括一个梁状元件（代表机器连杆），安装在连接到底板（代表机器支撑结构）的间隙连接中。钢板由弹性构件支撑，弹性构件代表机器的隔振支撑。该系统是由通过底板施加在梁上的力激发的。这个简化的模型，虽然是一种简化，但它包含了在一大类机器系统中发现的所有基本元素的表示。该系统的动力学建模基于有限元方法。其有效性将通过实验进行验证。复杂的建模工作类似于与简单模型相关的工作，但将集中在更能代表现实机器系统的模型上。

Currently, limitations on the ability to model the dynamic behavior of machine systems often result in performance reducing dynamic behavior. This project addresses that limitation and focuses on the development of analytical design models of the dynamics and vibration of high performance, high productivity machine systems. It extends previously developed modeling techniques to more general machine configurations that include supporting structures, machine enclosures, and several types of clearance connections. The dynamic models will be formulated to permit the future integration with acoustic analysis techniques for predicting machine noise. The research examines both simple and complex dynamic models and concludes with an experimental evaluation of the models. The baffled impact beam is an example of a simple model. It comprises a beam like element (representative of a machine link) mounted in clearance connections attached to a base plate (representing a machine supporting structure). The plate is supported by elastic members which represent a machine's vibration isolation supports. The system is excited by forces applied to the beam through the base plate. This simplified model, although a simplification, contains representations of all of the essential elements found in a large class of machine systems. Dynamics modeling of this system is based on the finite element approach. Its validity will be tested experimentally. The complex modeling effort is similar to that associated with the simple models but will concentrate on models which are more representative of realistic machine systems.