基于DSP的无刷直流电动机实验平台设计

通过对无刷直流电动机调速系统基本原理和控制方法的研究,结合数字信号处理器TMS320LF2407的特点,设计了一种小功率无刷直流电机调速系统实验平台,论述了平台的软、硬件设计,该实验平台能满足对无刷直流电机研究需要。     

国际热核聚变实验堆磁体线圈终端盒的设计

线圈终端盒（CTB）是国际热核聚变实验堆超导磁体系统的重要组成部分，其内部组件的漏热常常是整个磁体系统的主要漏热源之一，在很大程度上决定着低温系统的液氦消耗量。本文从降低热负荷的角度对CTB内部冷屏、超导电流传输线、电流引线、阀及冷却管路、外部盒体的设计进行了详细阐述，为最终结构的确定提供了理论依据。     

基于精度依据准则的图像分割算法评价

在图像处理中,图像分割是一类重要的研究方向。图像分割算法的好坏,影响到分割结果的优劣,因此对分割算法的性能评估十分重要。本文提出了一种图像分割算法性能的评价方法——精度依据准则,该准则是对原始特征量值和实际特征量值做比较,通过对绝对值的大小来判断算法的好坏。通过实验比较,该方法具有不错的算法性能评估准确度。     

EPICS控制系统中的Oracle数据库采集

介绍EPICS(Experimental physics and industrial control system)控制系统中针对Oracle的数据库采集。深入剖析了EPICS通讯协议、Oracle联网协议，详细介绍了采集软件的体系结构和实现方法，最后对EPICS稳定性做了测试。本文给出了采集程序对控制系统影响的测试结果和采集程序运行情况。     

机器人仿真通用试验平台的设计与实现

阐述了建立一种通用的机器人仿真试验平台的方法。首先介绍了VC 6．0，OpenGL和MATLAB三种软件各自的优点；其次把这三者的优点结合起来，建立通用的机器人仿真试验平台；最后通过建立移动操作手的运动仿真系统为例，证明了这种试验平台的优越性和有效性。     

An evaluation of methods for prioritizing software requirements

This article describes an evaluation of six different methods for prioritizing software requirements. Based on the quality requirements for a telephony system, the authors individually used all six methods on separate occasions to prioritize the requirements. The methods were then characterized according to a number of criteria from a user's perspective. We found the analytic hierarchy process to be the most promising method, although it may be problematic to scale-up. In an industrial follow-up study we used the analytic hierarchy process to further investigate its applicability. We found that the process is demanding but worth the effort because of its ability to provide reliable results, promote knowledge transfer and create consensus among project members.     

Experimental design with fuzzy levels

A novel technique is introduced for planning experimental design employing fuzzy rule-based systems. The significant aspect of the proposed experimental design with fuzzy levels (EDFL) is assigning a membership function for each level of variable factors. Consequently, the design matrix and observed responses can be represented in a set of fuzzy rules. Several examples are presented to clarify the proposed idea and the results are compared with the conventional Taguchi methodology. We have specifically planned an L18 orthogonal array EDFL for the solder paste printing stage of surface mount printed circuit board assembly to provide a model for the process and to optimize the selection of variable factors.     

明槽非恒流矩形薄壁堰流量公式的研究

一般在水流试验槽的末端设置量水堰，在河流中则设置水文站，用以率定恒定流的水位Ｈ和流量Ｑ０之间的关系。但在非恒流下，这种关系形成绳套，必须另加变量起涨水位Ｈ′０，和水位Ｈ随时程ｔ和流程ｘ的偏导数Ｈｔ和Ｈｘ，即Ｑ＝Ｑ（Ｈ′０，Ｈ，Ｈｔ，Ｈｘ），才能得出合理的关系。当今对非恒流挪用恒定流Ｑ０＝Ｑ（Ｈ）的关系是不合理的。本项研究对非恒流通过矩形薄壁堰三种堰高Ｐ分别实验，各得出满意的拟合结果。并制定出了非恒流矩形簿壁堰的流量公式，用数值计算成果和实验资料校核验证了公式的正确性，以补充当今水力学手册之不足。本试验设备获清华大学实验技术成果三等奖。     

Experimental investigation of a vapor absorption refrigeration system

An experimental investigation of the performance of a commercially available vapor absorption refrigeration (VAR) system is described. The natural gas-fired VAR system uses aqua-ammonia solution with ammonia as the refrigerant and water as the absorbent and has a rated cooling capacity of 10 kW. The unit was extensively modified to allow fluid pressures and temperatures to be measured at strategic points in the system. The mass flow rates of refrigerant, weak solution, and strong solution were also measured. The system as supplied incorporates air-cooled condenser and absorber units. Water-cooled absorber and condenser units were fitted to extend the VAR unit's range of operating conditions by varying the cooling water inlet temperature and/or flow rates to these units. The response of the refrigeration system to variations in chilled water inlet temperature, chilled water level in the evaporator drum, chilled water flow rate, and variable heat input are presented.     

电磁拓扑分析中的BLT方程及其应用

文章论述了分析复杂系统的电磁干扰问题的电磁拓扑方法，主要介绍了电磁拓扑理论中重要的BLT方程各个参量的含义及工程应用中的计算方法，并结合一种典型的现代通信网络结构进行了简单的举例分析。电磁拓扑方法在分析现代电子系统对复杂电磁环境的响应中具有重要的理论和工程意义。