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POWER OPTIMIZATION OF FINITE STATE MACHINE BASED ON GENETIC ALGORITHM 被引量:1
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作者 XiaYinshui A.E.A.Almaini WuXunwei 《Journal of Electronics(China)》 2003年第3期194-201,共8页
Using state assignment to minimize power dissipation and area for finite state ma-chines is computationally hard. Most of published results show that the reduction of switchingactivity often trades with area penalty. ... Using state assignment to minimize power dissipation and area for finite state ma-chines is computationally hard. Most of published results show that the reduction of switchingactivity often trades with area penalty. In this paper, a new approach is proposed. Experimentalresults show a significant reduction of switching activity without area penalty compared withprevious publications. 展开更多
关键词 Finite state machine State assignment Power dissipation Area Genetic algorithm OPTIMIZATION
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Interactions of Two Identical Wave Trains with a Relative Separation Angle of 24?
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作者 MA Yuxiang LIU Dianyong +2 位作者 LIU Wei DONG Guohai PERLIN Marc 《Journal of Ocean University of China》 SCIE CAS CSCD 2017年第4期683-688,共6页
Interactions between two identical monochromatic wave trains with a relative separation angle of 24? were experimentally investigated in a well-designed ‘X' configuration.Wave trains with different amplitudes and... Interactions between two identical monochromatic wave trains with a relative separation angle of 24? were experimentally investigated in a well-designed ‘X' configuration.Wave trains with different amplitudes and frequencies were generated.The results demonstrated that the interaction was strongly dependent on both wave amplitude and frequency.For nonbreaking and lower-frequency cases,the wave trains can approximately reestablish their initial state following the interaction.However,for larger waves,the interaction was enhanced,distorting the surfaces significantly-the wave trains were no longer two-dimensional after the encounter.During the interaction process,there was an obvious increase in wave height,reaching a maximum amplification in the middle of the interaction region that was approximately 1.55 times the initial height.Furthermore,the images captured by high-speed cameras illustrated that two wave trains entered the interaction region at the same time and then merged during the interaction process,resulting in an increase in wave amplitude.The combined wave crest was initially composed of two straight segments with a relative angle of 24? and gradually morphed into a single segment as is evident in the plan view.The wave then broke in the downstream,still within the interaction region,exhibiting a crescent pattern along the crest. 展开更多
关键词 wave-wave interactions wave breaking bidirectional propagation
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发电机定子绝缘状态的评价标准 被引量:2
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作者 Dan ZLATANOVICI 满宇光 《国外大电机》 2014年第2期15-21,共7页
本文介绍了罗马尼亚在大型发电机定子绝缘评定领域的专门技术。在1976年,ICEMENERG开始了监测发电机绝缘状态变化和基于非破坏性的、预防性的介电性能测试诊断方面的研究计划。测试项目包括:介质损耗角因数、局部放电量、直流耐电压... 本文介绍了罗马尼亚在大型发电机定子绝缘评定领域的专门技术。在1976年,ICEMENERG开始了监测发电机绝缘状态变化和基于非破坏性的、预防性的介电性能测试诊断方面的研究计划。测试项目包括:介质损耗角因数、局部放电量、直流耐电压试验(绘制电流与电压关系曲线)、极化指数和放电指数(在测量绝缘电阻过程中确定),最近又增加进行了耐电晕试验(TVA)。总之,在在大量大型汽轮发电机和水轮发电机上进行了系统的介电性能试验。基于该领域的参考文献,测试结果的分析并结合相应线圈的历史数据,制定和完善了定性和定量地评价绝缘整体状态的标准。根据经验,将绝缘状态化分为三个等级:Ⅰ级-缓慢、正常老化;Ⅱ级-加重老化;Ⅲ级-严重老化在此基础上,将良好状态定义为零级老化。定量标准的有效性确认比例约90%,目前这些标准是电机进行维护工作量的决定基础,也是决定绕组是否进行全部重绕的判定依据。如果所做的决策需要付出昂贵的消耗,比如进行重绕,可以进行一套独立的试验对最初的决定进行确认。经过试验,无论绝缘状态的结果是否经过确认,取决于试验结果的概率可以通过贝叶斯公式计算得到。如此确定的机率代表了根据绝缘状态所做决策的置信度。所做的试验越多,置信度水平增加或者降低的越多。一个必要的条件是要有寿命预测的历史数据,包括试验结果。最终,给出了一个根据水轮发电机绝缘状态进行决策的应用案例。 展开更多
关键词 发电机 定子绝缘 介电性能测量 评价标准 状态机率 贝叶斯公式
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