本文说明目前正在进行的巴西卫星运载火箭的模态分析计划。对一个固体推进的四级运载火箭全尺寸模型按5种不同的构型进行试验。为模拟自由-自由边界条件,研制了一个摆式悬挂系统,研究了它对组装结构振动特性的影响。本文给有有限元法(FEM)模型理论分析结果和模态试验的初步结果,并讨论了理论分析/实验结果的相关性。 This article describes the ongoing modal analysis of the Brazilian satellite launch vehicle. A solid-propelled four-stage launch vehicle full-scale model was tested in five different configurations. To simulate the free-free boundary conditions, a pendulum suspension system was developed and its influence on the vibration characteristics of the assembly structure was studied. In this paper, the finite element method (FEM) model theoretical analysis results and preliminary results of modal tests are given, and the theoretical analysis / experimental results are discussed.