风冷热泵机组运行测试及分析

风冷热泵机组在我国被广泛用作空调系统的冷热源,尤其是在长江中下游地区.本文对在运行中风冷热泵机组进行测试,并对其性能进行了分析.要充分提高风冷热泵运行的效率,应注意空调系统与机组的匹配,注意机组自控设置等.     

多功能热泵机组的能效评价指标研究

多功能热泵机组评价指标及相关标准的缺失在很大程度上制约了该技术在我国的发展.在介绍多功能热泵机组的工作原理的基础上,依据多功能热泵机组在不同的模式下的对象特性分别对国内外相关标准进行了研究.为了使多功能热泵机组的标准制定更具针对性,还按照热源形式等11个方面对多功能热泵机组进行了类别的划分,并根据我国5个不同的气候区域的特点,按运行模式和温区对多功能热泵机组进行了全年运行过程中各种运行模式的累积时间分布的分析,给出了多功能热泵机组全年运行的能效评定指标APF的计算依据.     

大型火电机组汽流激振故障的诊断与治理

某电厂200 MW机组大修后一年时间内发生过30多次阵发性振动,使机组无法带满负荷运行.经过理论分析与试验研究,认为该200MW机组阵发性振动主要是由于汽流激振引起的.对机组按汽流激振故障进行了治理,消除了该机组存在的阵发性振动,保证了机组的安全运行.该例对高参数大型火电机组有参考价值.     

热电机组轴系热态不对中的振动响应与故障诊断

就某厂热电机组存在的由于轴系热态对中度变化,影响轴系振动与机组运行稳定的问题进行了分析和诊断.并在分析轴系不对中的旋转机械系统的振动机理的基础上,对机组的运行进行实际的考察和调整,得出了机组因轴系热态对中度变化及联轴器连接不良,激励产生的轴承振动响应而状态劣化的结论.     

1000MW燃煤机组高压厂用电互为备用的可行性分析

针对某百万机组的高压厂用电接线形式,结合机组停运的各种工况,对高压厂用电源互为备用的方式进行了论述.重点分析了1台机组停运时,停运机组的辅机设备使用运行机组厂用电的可行性.可为同类机组设计、优化阶段提供借鉴和参考.     

百年电力3号机组异常振动分析处理

百年电力3号机组大修中进行了增容改造后,机组启动、定速和带负荷过程发生异常振动,严重威胁机组的安全运行.通过频谱分析、振动升降特性和机组带负荷的振动特点等特征对机组的振动故障进行了正确的诊断分析,确认了汽轮机中压缸内的动静摩擦和低压转子一阶和二阶不平衡量的存在是造成的机组异常振动的原因.通过调整2号轴承座的标高和低压转子的一次精确加重,成功消除了机组的振动故障,振动达到优良水平,保证了机组的安全投产运行.     

地源热泵间歇运行方式对地温恢复和机组能效的影响研究

优化地源热泵的运行管理策略,降低土壤热不平衡对地源热泵机组性能的影响,是保证地源热泵机组长期稳定高效运行的重要措施.以天津市某办公楼的地源热泵系统为研究对象,对其多年运行之后的土壤温度变化和系统能效变化进行了模拟分析,分析比较了不同间歇运行方案下得到的土壤温度和热泵机组能效的变化.结果表明,地源热泵机组连续运行30年时,土壤温度受热不平衡的影响,呈逐年波动式上升,前15年上升幅度较大,后15年增幅较缓.地源热泵系统间歇运行将有利于地温的恢复,机组的启停比对地源热泵系统土壤温升的累计影响显著大于运行起止时间对土壤温升的影响.研究结果可为地源热泵系统的运营管理提供重要参考与借鉴.     

火力发电厂汽轮机振动故障分析与检修

汽轮机是火力发电机组的核心组成部分,其运行中故障缺陷如不能及时排除,将会危及机组安全稳定运行.本文以某火力发电厂引进罗马尼亚湿冷机组经现代化增容改造至360MW机组为例,对汽轮机组的振动故障进行分析,并针对具体问题提出相应的检修措施.     

一种组合式蒸发冷却空调机组的性能测试与分析

本文简要介绍了蒸发冷却器的冷却原理,尤其是组合式蒸发冷却机组的冷却处理过程.同时对组合式蒸发冷却机组进行测试分析,得出其运行参数情况.经过对比分析,得出机组制冷过程各个不同组合情况下的效果,为机组改良提供一些数据,从而提高其供冷能力.     

非稳态工况下组合式空调机组性能的数值模拟

目前对组合式空调机组性能的研究多为稳态运行工况下机组性能的实验研究,研究具有单一性;另一方面,目前对机组在非稳态运行工况下性能的研究比较少.本文采用数值模拟的方法,较为详细的分析了从开机运行到最终稳定过程中机组的性能参数变化情况,得到一些可用来指导空调机组运行调节的参考数据和研究方法.     

Loading and scheduling for flexible manufacturing systems with controllable processing times

This study addresses the problem of determining the allocation of operations and their tools to machines, the operation processing times and the allocation/sequence of the parts to be processed on each machine for flexible manufacturing systems with controllable processing times. Tool lives, tool copies and tool sharing are also considered. An integer programming model is developed for the objective of minimizing the sum of operation processing and tardiness costs. Then, iterative algorithms are proposed that solve the two subproblems iteratively, where the loading subproblem is solved by a modified bin packing algorithm under initial processing times and the resulting scheduling subproblem is solved by a priority scheduling method while modifying the loading plans and operation processing times iteratively. Computational experiments were carried out, and the results are reported.     

考虑组织学习率-倦怠的SMPEs小组作业模式生产加工周期优化研究

以我国众多中小生产企业人工手工工序作业系统的作业组织模式为研究对象,考虑小组工人在组织学习率-倦怠双因素的影响下,以小组作业模式的生产加工产品批完工时间为目标函数,通过仿真分析得出工人产品批加工生产周期的较优方案。通过例证结果表明：适当休息时间和休息次数,产品批的生产加工周期更优;过长或过短的休息时间和过多或过少的休息次数,都将影响产品批的生产加工周期。     

A multi-nano-dot circuit and structure using thermal-noise-assisted tunneling for stochastic associative processing

The single-electron circuit and nanostructure described in this paper are designed for stochastic associative processing, which is an expanded version of ordinary associative memory processing. In stochastic associative processing, the association probability of each stored pattern depends on the similarity between the stored pattern and the input pattern. Such unique processing is useful for sequential stochastic association and for clustering for vector quantization. Conventional single-electron circuits operate only at very low temperature for practical junction capacitance (i.e., 30 K for 0.1 aF) because the charging energy in these circuits is directly related to the tunnel junction capacitance. Our multi-nano-dot circuit and structure operate at room temperature with a junction capacitance around 0.1 aF through tunneling processes assisted by thermal noise. We analyze the operation of this circuit in detail and propose for it a stochastic associative processing operation, where the detection timing of the electron position controls the association probability distribution.     

基于数学形态学的印品质量在线检测研究

数学形态学以图像形态特征为研究对象,其图像处理算法主要有膨胀运算、腐蚀运算、开运算及闭运算,其应用于图像预处理的方式主要有图像增强、图像分割及噪声滤除等。国内外对数学形态学在印品质量在线检测中的应用进行了广泛而深入的研究,并研制出各种新型自动化印品质量检测设备。印品质量在线检测未来的研究方向主要为:在线检测运动图像采集标准的确立,灰度图像算法在彩色图像处理中的应用,颜色缺陷的分类,图像预处理计算量的减少及实时性的提高等。     

Tabu search for the job-shop scheduling problem with multi-purpose machines

In this paper we study the following generalization of the job-shop scheduling problem. Each operation can be performed by one machine out of a set of machines given for this operation. The processing time does not depend on the machine which has been chosen for processing the operation. This problem arises in the area of flexible manufacturing. As a generalization of the jobshop problem it belongs to the hardest problems in combinatorial optimization. We show that an application of tabu search techniques to this problem yields excellent results for benchmark problems.Supported by Deutsche Forschungsgemeinschaft, Project JoP-TAG     

Joint transform correlator for optical temporal signals

Correlation is considered to be a fundamental operation in the field of signal processing. The fact that this operation can be implemented optically in a relatively simple manner is an important advantage of utilizing optical systems for signal processing. The VanderLugt 4-f system and the joint transform correlator (JTC) are the two most popular configurations for performing a spatial correlation operation optically. So far the JTC architecture has been used for performing correlation between two images, which are illuminated by a quasi-monochromatic light source. We propose a generalization of the JTC that performs a correlation between two temporal optical signals.     

2006年广东省高校数控技能大赛数控车床竞赛评述

文章介绍2006年广东省高校数控技能大赛数控车床竞赛的理论知识、软件应用和操作技能竞赛的内容和过程,重点对操作技能竞赛进行阐述,提出加工的思路和解决方案.     

The Application of Critical Path Method (CPM) in Workflow Schema of Marble Processing Plants

The critical path method (CPM) is a widely applied technique in large-scale industrial project planning and control. Based on a detailed review of the current literature, no references have been found referring to the use of the CPM in marble processing plants and other industrial mineral plants. In this regard, this study proposes a new application area of CPM and suggests the implementation details of mineral processing workflows with particular emphasis on marble production facilities. In the study, the CPM is applied to marble processing plants for selecting an applicable production process and for determining the workflow schema in order to optimize the cost of operation and to effectively manage time. As a consequence of this analysis, a new production plan is proposed for medium-scale marble processing plants. A suitable marble processing plant has been built and taken into operation in accordance with the proposed plant plan. It has been observed that this plant has a higher production rate at a preferable capacity when compared to three other plants studied as a part of this research.     

胶片特性测量误差分析及控制方法

通过对标准片质量、光楔制作、密度计量和胶片冲洗几项条件的分析、研究,归纳总结了胶片特性测量误差来源以及控制并减少其误差的有效方法,提出了加强管理、严格规范操作规程等降低胶片特性测量误差的方法,从而确保胶片的冲洗质量。     

帧频2900Hz的高速实时波前处理机

波前处理机是自适应光学系统波前处理运算的中心 ,其运算延时直接影响系统的控制带宽。在 6 1单元自适应光学系统中 ,我们根据采样频率 2 90 0 Hz的Hartmann波前传感器输出信号的特点 ,采用流水和并行处理技术 ,用 1 2片TMS32 0 C5 0和 5片 TMS32 0 C31处理器 ,研制了我国首台峰值运算速度达 8.5亿次/秒的专用高速实时数字波前处理机 ,满足了系统的实时性要求。