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对冲式止回阀低流量关闭过程动态特性分析 被引量:5
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作者 杨志达 陈炳德 +2 位作者 黄伟 韩伟实 张志明 《哈尔滨工程大学学报》 EI CAS CSCD 北大核心 2014年第3期331-335,共5页
为减小动力装置止回阀切换时的水击和阀头与阀座的撞击,提出了阀头与流体运动方向互逆的对冲式止回阀。将FLUENT的动网格技术引入到止回阀内部流场的模拟中,解决了阀门关闭时内部流场区域瞬时变化的问题。由牛顿运动第二定律的欧拉显式... 为减小动力装置止回阀切换时的水击和阀头与阀座的撞击,提出了阀头与流体运动方向互逆的对冲式止回阀。将FLUENT的动网格技术引入到止回阀内部流场的模拟中,解决了阀门关闭时内部流场区域瞬时变化的问题。由牛顿运动第二定律的欧拉显式格式得出了阀门在关闭过程中的流量变化,阀头、阀座的受力变化和速度变化,通过以上参量判断阀头、阀座的工作状态,最后通过实验来验证理论分析的结果。模拟结果与实验表明,动网格技术能够较好地模拟阀门内部流场的变化,对冲式止回阀能够可靠地在小流量情况下关闭。 展开更多
关键词 止回阀 动态特性 动网格 用户自定义文件 流场 user-defined FUNCTION ( UDF)
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Confidence support vector domain description 被引量:2
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作者 Liu Sanyang Liang Jinjin +1 位作者 Wu De Duan Wei 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2009年第4期852-857,共6页
To accelerate the training of support vector domain description (SVDD), confidence support vector domain description (CSVDD) is proposed based on the observation that the description boundary is determined by a sm... To accelerate the training of support vector domain description (SVDD), confidence support vector domain description (CSVDD) is proposed based on the observation that the description boundary is determined by a small subset of training data called support vectors. Namely, the number of training samples in the userdefined sphere is calculated and taken as the confidence measure, according to which the training samples are ranked in ascending order. Those former ranked ones are selected as the boundary targets for the SVDD training. Simulations on UCI data demonstrate the effectiveness and superiority of CSVDD: the number of training targets and the training time are reduced without any loss of accuracy. 展开更多
关键词 support vector domain description confidence support vector domain description user-defined sphere confidence measure boundary targets.
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