论文部分内容阅读
上节介绍的两种模态分析方法建立在主导模态基础上。尽管其精度比经典的共振法有较大提高,但仍属近似分析方法。为了进一步提高模态分析的精度,用于建立复杂结构的动态数学模型,近十年来计算机化的模态参数识别技术蓬勃发展,复杂结构的模态分析进入新的阶段。所谓计算机化模态参数识别,即根椐振动测试数据(在频域中即单点激振、多点测量的机械阻抗数据),通过一定算法,由计算机求出某种意义下是最优的振动模态参数。
The two modal analysis methods introduced in the previous section are based on the dominant modes. Although its accuracy is better than the classical resonance method, it is still an approximate analysis method. In order to further improve the accuracy of modal analysis and to establish a dynamic mathematical model of complex structure, computerized modal parameter identification technology has flourished in recent ten years and modal analysis of complex structures has entered a new phase. The so-called computerized modal parameter identification, that is, the root vibration test data (in the frequency domain that single-point excitation, multi-point measurement of mechanical impedance data), by a certain algorithm, calculated by the computer in some sense is the best Vibration modal parameters.