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

该项目提供设备，MASSCOMP数据采集和信号处理系统，以支持结构动力学研究。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。第一个项目解决了一系列未解决的结构动力学问题。这些包括对结构进行紧密间隔模式建模的能力，这些模式的谐振带宽在频域重叠，以及结构界面的阻尼机制。该项目使用了三维空间桁架和网格或桁架系统支撑的板壳结构。保护有用的数据需要在结构上的两个位置放置12个加速度计阵列。因此，MASSCOMP系统可以同时获取和处理24个数据通道。第二个项目的重点是开发实用的实验技术来研究模式转换现象。当结构的一部分中与一个模态相关的弯曲运动与相邻结构部分中与不同模态相关的纵向运动耦合时，就会发生这种情况。这里使用的方法是空间频率或波数处理技术。它还需要同时从一系列加速度计中采集结构变形数据样本，然后通过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.