“系统识别”是利用系统的试验或运行数据,构造数学模型和估计参数的理论和方法。通常,利用试验数据来构造模型,称为“识别”,而利用试验数据来确定已知模型的某些参数,称为“参数估计”,也称为“参数识别”。结构动力学中的参数识别,是由测得的响应,反求系统的结构参数,包括模态参数(频率、模态等)和物理参数(质量、阻尼、刚度等)。例如,利用高层建筑物在地震中的记录来推算结构的振动特性,利用飞行器的遥测数据来推算结构特性和予测颤振边界,利用旋转机械在运行中的振动数据来推算机器的振动特性并进行故障监测和诊断等等。通常的结构动力分析,是已知结构 “System identification” is the theory and method of constructing mathematical models and estimating parameters by using the system’s experimental or operational data. Typically, the test data is used to construct the model, called “recognition,” and the test data is used to determine some of the parameters of the known model, called “parameter estimation,” also known as “parameter identification.” The parameter identification in structural dynamics is based on the measured responses and the inverse structural parameters of the system, including modal parameters (frequency, modal, etc.) and physical parameters (mass, damping, stiffness, etc.). For example, the vibration characteristics of a structure can be estimated by using records of high-rise buildings in an earthquake. The telemetry data of the aircraft can be used to calculate the structural characteristics and predict the flutter boundary. The vibration characteristics of a rotating machine can be used to calculate the vibration characteristics of the machine. Fault monitoring and diagnosis and so on. The usual structural dynamics analysis is a known structure