一、前言最近上海航天局801所引进美国STI公司的振动分析和测量处理系统STI11/23,作者参加了该系统的验收工作。为了考验系统的性能和工作状态,我们用自由——自由梁作为典型试件,除了由STI11/23采用随机激励,快速正弦激励和稳态正弦激励三种方法识别模态参数外,还由BK2034分析仪,SD375动态分析仪采用锤击法和随机激励方法以及用传统的正弦 I. INTRODUCTION Recently, STI11 / 23, the vibration analysis and measurement processing system introduced by Shanghai STI 801, was introduced by Shanghai Aerospace Bureau. The author participated in the acceptance of this system. In order to test the system performance and working condition, we use free-free beam as a typical specimen, in addition to STI11 / 23 using random excitation, fast sinusoidal excitation and steady-state sinusoidal excitation three kinds of methods to identify modal parameters, but also by the BK2034 Analyzer, SD375 dynamic analyzer using hammering method and random excitation method and the traditional sine