cxd

According to the excellent time-frequency localization analysis properties of the wavelet packet , this thesis describes the distribution of the transient signal quantitatively in time-frequency space by introducing the cxD - norm .

基于小波包变换的优良时频分析特性，通过引入子频带的∞&范数来定量地描述瞬态信号在时频空间中的分布，提出了瞬态信号阈值去噪和频谱分析的新方法。

Technical improvements on CXD 0.5-5.5 type narrow aisle front and lateral stacker are made . Harmonic gear reducers in revolving mechanism and side-shifting mechanism are replaced by planetary gear reducers with fewer difference in tooth numbers . The ability of the mechanisms against impact load is raised .

对CXD0.5-5.5型巷道堆垛叉车作了技术改进，回转机构减速器和侧移机构减速器由原谐波齿轮传动改用少齿差行星传动，提高了承受冲击载荷的能力；