人才资源智能管理系统的设计

以冶金工业部人才资源的管理问题为背景,给出了人才资源智能管理系统的具体设计方法.该系统中,广义的管理分析预测模型树用于其知识表达,系统结构由多库结构支持;在其推理机方面,应用元知识推理以协调定性推理、定量推理和人工神经网络推理.将有限的自然语言理解引入人-机界面,用TURBO PROLOG和C语言在IBM/AT微机上对该设计部分实现,表明了其合理性及可行性.     

基于诺西设备的WCDMA接续时长的研究

本文对影响WCDMA接续时长相关参数及信令流程进行详细分析,并通过具体不同参数的设置及现场测试验证,分析其对呼叫建立时长的影响,根据测试结果给出最优的参数值。     

水泥粉喷桩复合地基的工程特性

通过现场原位试验,研究了粉喷桩复合地基受荷作用后的工作性状和桩土应力比的特点,并据此提出了复合地基承载力标准值的取值方法．依据桩身变形破坏特点,分析了粉喷桩复合地基的变形破坏机理,探讨了其变形计算方法．     

多功能测试堵头的研制与应用

针对目前测试堵头在使用过程中存在的弊端 ,研制了多功能测试堵头。该堵头结构简单、方便实用、安全可靠 ,有效解决了钢丝的防腐问题 ,杜绝了测试“冒顶”事故的发生 ,经现场多次试验及应用 ,效果明显。     

Intelligent high-speed cutting database system development

In this paper, the components of a high-speed cutting system are analyzed firstly. The component variables of the high-speed cutting system are classified into four types: uncontrolled variables, process variables, control variables, and output variables. The relationships and interactions of these variables are discussed. Then, by analyzing and comparing intelligent reasoning methods frequently used, the hybrid reasoning is employed to build the high-speed cutting database system. Then, the data structures of high-speed cutting case base and databases are determined. Finally, the component parts and working process of the high-speed cutting database system on the basis of hybrid reasoning are presented. __________ Translated from Computer Integrated Manufacturing Systems, 2006, 12(3): 420–427 [译自: 计算机集成制造系统]     

微陀螺静电力调频的快速收敛算法研究

针对电容式微陀螺谐振结构,研究了静电力对谐振频率的影响规律,提出了一种快速收敛的静电力调频算法,建立了微陀螺调频实验系统,该系统采用扫频方法测量谐振频率,利用计算机控制调频收敛过程,并对微陀螺进行了调频实验,调频过程用时少于5分钟,实验结果表明该调频算法具有较快的收敛速度。     

Analytical modeling and experimental investigation of tool and workpiece temperatures for interrupted cutting 1045 steel by inverse heat conduction method

Cutting temperature is a key factor which directly affects tool wear, workpiece integrity, and machining precision in high speed machining process. The interrupted cutting process consists of several periodical characteristics, such as cutting force and time varying heat source. Induced cutting temperature models with time varying heat flux are developed in this paper to predict temperature distribution at tool inserts and workpiece during interrupted cutting process. A set of interrupted cutting experimental installation is designed to verify the proposed models. The comparison of predicted and measured results for 1045 steel in interrupted cutting processes shows reasonable agreement. The measured temperature of both the tool inserts and workpiece increase firstly and then decrease as the cutting speed increases. The peak temperature of the workpiece appears at 1500 m/min, while the peak tool inserts temperature appears at 1250 m/min approximately. Heat flux is calculated by the inverse heat conduction method. The applicability of Salomon's hypothesis to the temperature of tool inserts and workpiece is discussed during the interrupted cutting process. The dropped temperature at high cutting speed is mainly caused by that heat flux into tool inserts decreases and heat transfer time is not enough after the critical cutting speed.     

金属切削加工热弹塑性大变形有限元理论及关键技术研究

基于有限变形理论、虚功原理和更新的拉格朗日公式建立了热弹塑性本构方程，导出了热弹塑性大变形耦合控制方程。对切削加工有限元模拟中的关键技术，如材料模型，工件和切屑的分离、断裂准则，刀具、切屑间的接触摩擦模型以及切削热进行了探讨，针对这些关键技术建立了正交切削加工铝合金7050T7451有限元模型，对切屑形态、切削力、切削温度以及应力场和应变场等物理量的分布进行了有效预测。     

高速切削锯齿形切屑表征的研究现状综述

研究高速切削形成的锯齿形切屑的表征有利于科学地阐释锯齿形切屑的形成机理.这种表征包括几何表征和物理表征.几何表征是从切屑的几何形状和形成机理上进行表征,几何形状可用切屑的锯齿化程度来表征,形成机理可分别用绝热剪切理论和周期性断裂理论来表征.物理表征包括锯齿形切屑的变形、显微硬度、微观组织结构的表征.切屑变形包括切屑单元...     

通过声音信号判断切削颤振的试验研究

通过建立高速铣削试验台获取高速铣削声音信号,并对数据进行分析,发现切削过程声音信号的幅频域特性与其稳定性有着紧密的联系.该试验为利用声音信号判断切削颤振提供了事实依据,并为切削颤振控制打下了试验基础.