A Structured Approach to Identifying SEA Parameters from Measured Data

PI: Richard F. Keltie, ph . d .北卡罗莱纳州立大学摘要：本研究项目涉及从测量系统数据中提取有效的统计能量分析（SEA）参数所需的分析技术的开发和改进。SEA是一种方法，允许在有限元方法不可行的频率范围内预测系统结构动力和结构声学响应。如果能够高效、准确地获取所需的SEA参数，将大大提高SEA在工程设计中的应用。这项研究的目标是开发系统识别技术和数据采集方法，以确定这些所需的参数，如耦合损失因素。这一目标将通过实际工程系统的广泛测试来实现。在时域和频域应用的特征系统识别方法将用于估计SEA参数作为空间平均和空间范围的函数。将研究稳态能量耦合矩阵的直接反演和瞬态响应能量的状态空间实现。这项研究的结果将确定获得必要的环境影响评估参数所需的数据采集和分析技术。这些结果将使设计人员和分析人员更容易、更有信心地实施该技术，从而使该方法在工程设计实践中得到显著扩展。

PI: Richard F. Keltie, Ph.D.North Carolina State UniversityProposal No.: CMS-9908326Title: A Structured Approach to Identifying SEA Parameters From Measured DataAbstract:This research project deals with the development and refinement of analysis techniques necessary to extract valid Statistical Energy Analysis (SEA) parameters from measured system data. SEA is a methodology that permits prediction of system structural dynamic and structural acoustic response in frequency regimes where the finite element method is not feasible. The use of SEA in engineering design could be significantly increased if the necessary SEA parameters can be obtained efficiently and accurately. The goal of this research is to develop system identification techniques and data acquisition methods that will allow for the determination of these required parameters, such as coupling loss factors. This goal will be accomplished through extensive testing using realistic engineering systems. Eigensystem identification methods, applied both in the time domain and in the frequency domain, will be used to estimate SEA parameters as a function of spatial averaging and spatial extent. Both direct inversion of the steady-state energy coupling matrix and a state space realization of the transient response energy will be examined. The results of this research will define the data acquisition and analysis techniques required for obtaining necessary SEA parameters. These results will permit the technique to be implemented more easily and with more confidence by designers and analysts, allowing for a significant expansion of the method in engineering design practice.