首先,基于过程建模方法构建客车订单装配(Assemble to Order,ATO)系统模型。其次,构建面向ATO系统的数据仓库,并进行数据预处理。最后,使用多元统计方法分析ATO系统的基本特征,呈现为装配周期和装配能力数据立方体。采用概率统计方法分...首先,基于过程建模方法构建客车订单装配(Assemble to Order,ATO)系统模型。其次,构建面向ATO系统的数据仓库,并进行数据预处理。最后,使用多元统计方法分析ATO系统的基本特征,呈现为装配周期和装配能力数据立方体。采用概率统计方法分析ATO系统不确性特征,表现为需求、供应环境不确定性和装配线、装配过程系统不确定性。ATO系统特征可为智能决策和生产优化提供基础支持。展开更多
It is important to plan the assembling order automatically in order to reach assembling mechanization, especially intellectualization. The foundation of assembling order is how to understanding assembly drawing automa...It is important to plan the assembling order automatically in order to reach assembling mechanization, especially intellectualization. The foundation of assembling order is how to understanding assembly drawing automatically, namely the capacity of machine “drawing reading”. This paper introduces the general structure of ESUAD(Expert System of Understanding Assembly Drawing) system, its knowledge representation, the automatical understanding of assembly drawing, the plan of assembling order. Finally the paper will give the experiment result.展开更多
Ordered mesoporous silica were synthesized under different conditions:hydrothermal synthesis in basic medium,room temperature synthesis in acid medium and sol gel synthesis in neutral medium,and pore structure,specif...Ordered mesoporous silica were synthesized under different conditions:hydrothermal synthesis in basic medium,room temperature synthesis in acid medium and sol gel synthesis in neutral medium,and pore structure,specific surface area and pore size distribution of samples were studied and compared in detail by means of SAXRD,HRTEM,BET,FT IR.The results show that the mesopores in the samples obtained via above three methods all possess uniform hexagonal arrays in short range.Mesoporous silica obtained in acid medium possesses narrow pore size distribution centered around 1.24nm with specific surface area of 1220 m 2·g -1 ;Mesoporous silica obtained in basic medium by hydrothermal synthesis at 160℃ possesses narrow pore size distribution centered around 1.90nm with specific surface area of 542.8 m 2·g -1 ;and mesoporous silica obtained in neutral medium by sol gel synthesis possesses broader pore size distribution centered around 4.01nm,specific surface area of 485.0 m 2·g -1 .Therefore,ordered mesoporous silicas with different pore sizes can be prepared using various synthetic methods and conditions.After heat treatment,Si O Si bending vibration strengthens and the adsorption peak of asymmetrical Si O Si stretching vibration broadens,and the crosslinking and condensation reaction of silica skeleton strengthen, meanwhile the amount of active centers of hydroxyl group on the surface of mesopores may be influenced,thus chemical assembly activity of mesopores may also be influenced.展开更多
文摘首先,基于过程建模方法构建客车订单装配(Assemble to Order,ATO)系统模型。其次,构建面向ATO系统的数据仓库,并进行数据预处理。最后,使用多元统计方法分析ATO系统的基本特征,呈现为装配周期和装配能力数据立方体。采用概率统计方法分析ATO系统不确性特征,表现为需求、供应环境不确定性和装配线、装配过程系统不确定性。ATO系统特征可为智能决策和生产优化提供基础支持。
文摘It is important to plan the assembling order automatically in order to reach assembling mechanization, especially intellectualization. The foundation of assembling order is how to understanding assembly drawing automatically, namely the capacity of machine “drawing reading”. This paper introduces the general structure of ESUAD(Expert System of Understanding Assembly Drawing) system, its knowledge representation, the automatical understanding of assembly drawing, the plan of assembling order. Finally the paper will give the experiment result.
基金theNationalNaturalScienceFoundationofChina (No .50 2 72048)andtheNaturalScienceFoundationofHubeiProvince (No .2 0 0 1ABB0 76)
文摘Ordered mesoporous silica were synthesized under different conditions:hydrothermal synthesis in basic medium,room temperature synthesis in acid medium and sol gel synthesis in neutral medium,and pore structure,specific surface area and pore size distribution of samples were studied and compared in detail by means of SAXRD,HRTEM,BET,FT IR.The results show that the mesopores in the samples obtained via above three methods all possess uniform hexagonal arrays in short range.Mesoporous silica obtained in acid medium possesses narrow pore size distribution centered around 1.24nm with specific surface area of 1220 m 2·g -1 ;Mesoporous silica obtained in basic medium by hydrothermal synthesis at 160℃ possesses narrow pore size distribution centered around 1.90nm with specific surface area of 542.8 m 2·g -1 ;and mesoporous silica obtained in neutral medium by sol gel synthesis possesses broader pore size distribution centered around 4.01nm,specific surface area of 485.0 m 2·g -1 .Therefore,ordered mesoporous silicas with different pore sizes can be prepared using various synthetic methods and conditions.After heat treatment,Si O Si bending vibration strengthens and the adsorption peak of asymmetrical Si O Si stretching vibration broadens,and the crosslinking and condensation reaction of silica skeleton strengthen, meanwhile the amount of active centers of hydroxyl group on the surface of mesopores may be influenced,thus chemical assembly activity of mesopores may also be influenced.
