排序方式: 共有19条查询结果,搜索用时 828 毫秒
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Hilbert-Huang变换方法能自适应地提取非平稳数据的局部均值曲线,将复杂的叠加信号分解成有限数量的、且有物理意义的内蕴模式分量函数,从而得到有意义的瞬时频率和希尔伯特时频谱.它是一种局域波分析方法.其特点是比小波分析有更高的时频分辨率,没有Wigner-Ville分布的交叉项,特别适合分析非平稳数据.本文根据Hilbert-Huang变换的原理,推导出内蕴模式函数的递推表达式,给出了希尔伯特谱的最高频率分辨率,首次提出了一种新的的自适应频率多分辨分析原理和方法,从而完善了局域波分析的理论. 相似文献
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介绍密炼机的安装和调试,对各分项工程主要流程和工序提出明确要求。密炼机安装前需要进行技术资料和现场施工条件准备。密炼机安装过程如下:确定安装计划和安装工序,按作业工序进行安装,注意安装垫铁尺寸和垫铁安放方式、设备找正、正确使用地脚螺栓及设备找水平。密炼机调试顺序如下:高压润滑泵启动、减速机润滑系统启动、液压站系统启动、温控系统启功和主电动机启动,调试中对现场检查项目进行肉眼或仪器检查,详细填写检查记录表,确保密炼机试运转达到投产条件。有效安装和调试密炼机可提高工作质量和效率,节约时间和成本。 相似文献
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Due to the fact that in ship maintena n ce process,the method of determining the number of spare parts is not scientific and the actual operation is complicated,this paper analyzes four major facto rs affecting the number of ship spare parts,including number of main planned op eration s,total times of disassembling in maintenance,accumulated working time and mea n t ime between failures.It also establishes a spare parts demand forecast model b ased on the affecting factors and radial-basis function(RBF) neural network.F inally,the paper provide s forecast examples and makes a comparison between the examples and back propaga tion(BP) neura l network forecast result.The comparison results s how that the forecast based on RBF neural network is simple and the forecast res ult fits the actual situa tion and fitting effect is better than that based on BP. 相似文献
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