有效载荷约束边界的试验模态分析

摘要

The test modal analysis of rocket's payload with restriction boundary is lucubrated by move-base testing. The mode analysis method by move-base drive of carrier is indicated. The obvious advantage is detected for the mode analysis method by multi-shaker base-drive upon transmissibility matrix of frequency response function ratio. The physics testing result of a representative payload illustrate the consistency between the 6DOF move-base excite and in-service state of payload, the non-linearity of mode frequency, damping ratio as the change of base vector acceleration is reflected.%深入研究了火箭有效载荷约束边界模态分析的运动基础试验方法,提出了载体运动基础激励试验模态分析方法,发现基于频响比的传递矩阵估计的多维振动台基础激励试验模态分析有明显优点.典型有效载荷物理试验结果表明六自由度运动基础激励与有效载荷使用状态一致,基础运动矢量加速度的变化明显反映出结构模态频率和阻尼比的非线性特征.