中文摘要：

试验模态分析的数字信号采样环节存在频率混叠现象，针对无限长连续信号进行采样得到离散信号过程中所带来的混叠误差进行分析，提出抑制频混的采样改进措施。

英文摘要：

In experimental modal analysis, the digital signal sampling exists frequency aliasing Phenomenon. In this paper, the aliasing errors by discrete sampling are analyzed and the improvements to reduce the aliasing errors are proposed.