Engineering Research Equipment Grant: Multichannel Data Acquisition System for Structural Dynamic Research

该项目提供设备，MASSCOMP数据采集和 支持结构动力学的信号处理系统 research. 两个项目，题为机械系统中的能量流， 和波数处理技术将利用该设备。 的 第一个项目解决了一系列未解决的结构动力学问题 问题. 这些包括能够对结构进行建模， 其谐振带宽在频率上重叠的间隔模式 域和结构界面处的阻尼机制。 这 项目使用三维空间桁架和板或 支撑在网格或桁架系统上的壳状结构。 固定 有用的数据需要将12个加速度计的阵列放置在两个 结构上的位置。 24个同步通道， 由此，可以通过MASSCOMP系统获取和处理数据。 第二个项目的重点是开发实用的实验 研究模式转换现象的技术。 这 当弯曲运动与一个模式在一个部分， 结构与纵向运动耦合， 在结构的邻接部分中的不同模式。 述的方法 这里使用的是空间频率或波数处理 法 它还要求同时采集 结构变形数据从一个阵列的加速度计， 通过MASSCOMP系统处理数据。

This project provides equipment, the MASSCOMP data acquisition and signal processing system, for support of structural dynamics research. Two projects, entitled Energy Flow in Mechanical Systems, and Wavenumber Processing Techniques will utilize the equipment. The first project addresses a set of unresolved structural dynamics issues. These include the ability to model structures with closely spaced modes whose resonant bandwidths overlap in the frequency domain, and damping mechanisms at structural interfaces. This project uses both a three dimensional space truss and a plate or shell like structure supported on a grid or truss system. Securing useful data requires placing arrays of twelve accelerometers at two locations on the structure. Twenty four simultaneous channels of data can thereby be acquired and processed by the MASSCOMP system. The second project focuses on developing practical experimental techniques for studying the phenomenon of mode conversion. This occurs when flexural motion associated with one mode in one part of a structure couples with longitudinal motion associated with a different mode in an adjoining part of the structure. The method used here is the spatial frequency or wavenumber processing technique. It also requires taking simultaneous samples of structural deformation data from an array of accelerometers and then processing the data through the MASSCOMP system.