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本文叙述为满足振动、冲击、撞冲和模态评定试验以及为适应一般外场试验要求而设计的数字数据采集与分析系统。该系统具有把买来的和自己研制的部件组合起来的特点。有两个多通道的数据采集系统:一个是安装在环境试验室的系统,它有12个用于一般类型信号的并联输入通道,120个用于经模拟式同相一正交分析器预处理的正弦信号输入通道;另一个系统是模态评定试验系统的一部分,它设计有448个输入通道,能同时处理几个有64个通道的数据组。变形图形以及总的指示器值的实时显示有效地保证了手动模态调节。现有可用的模态分析软件的扩展,可把模态参数选择为待求的,或者也可指定为已知的。这一特点增加了系统的分辩能力。并且避免了不完善数据的错误解释。另一扩展是能够根据局部测量的响应函数计算单个刚体自由度的响应函数。这就给深入地了解刚体结构部件的动力特性提供了手段,而且使振型数据更加完善。在数据处理系统中还有一个分析子结构耦合程序,它有助于扩展试验能力以及获得最佳化试验特性。
This article describes digital data acquisition and analysis systems designed to meet vibration, shock, impact and modal qualification tests, and to meet the requirements of general field testing. The system has the characteristics of a combination of components purchased and self-developed. There are two multichannel data acquisition systems: one is a system installed in an environmental lab, which has 12 parallel input channels for signals of a generic type and 120 for pre-processing with an analog in-phase and quadrature analyzer Sinusoidal signal input channels; the other is part of the modal qualification test system, which is designed with 448 input channels and can process several 64-channel data sets simultaneously. Real-time display of deformation patterns and total indicator values effectively ensures manual mode adjustment. Extensions to available modal analysis software may be to select modal parameters as desired or may also be designated as known. This feature increases the system’s ability to distinguish. And to avoid the wrong interpretation of the imperfect data. Another extension is the ability to calculate the response of a single rigid body to a locally measured response function. This provides insight into the dynamic behavior of rigid structural components and provides more complete modal data. There is also an analytic substructure coupling program in the data processing system that helps to extend the test capabilities and optimize test features.