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相对速度测量误差对防空导弹引战配合性能影响 被引量:2
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作者 路宇龙 曹俊 《太赫兹科学与电子信息学报》 2016年第1期46-52,共7页
弹目相对运动速度是引战设计利用的最重要的交会参数,实际工程中使用的相对速度的测量通常都存在误差,误差的大小直接影响引战配合性能。本文基于这一现实问题,通过理论分析和仿真计算,就相对速度测量误差对引战配合性能影响进行研究,... 弹目相对运动速度是引战设计利用的最重要的交会参数,实际工程中使用的相对速度的测量通常都存在误差,误差的大小直接影响引战配合性能。本文基于这一现实问题,通过理论分析和仿真计算,就相对速度测量误差对引战配合性能影响进行研究,建立了引战配合的相对速度误差模型,通过理论分析和数值计算,得出了相关规律和减小其影响的措施,对工程应用有一定借鉴意义。 展开更多
关键词 引战配合 引战配合性能 相对速度误差 防空导弹
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非轴向速度分量对超声波流量计声道速度测量的影响 被引量:2
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作者 卢林冲 赵会军 唐金勇 《常州大学学报(自然科学版)》 CAS 2020年第3期40-46,共7页
为了定量分析输气管道中非轴向速度分量对超声波流量计声道速度测量的影响,建立管道模型,利用FLUENT软件获得管内气体流动情况,以水平布置的Gauss-Jacobi声道布局方案中的四声道和45°声平面布置的声道为例,采取逐个积分声道路径上... 为了定量分析输气管道中非轴向速度分量对超声波流量计声道速度测量的影响,建立管道模型,利用FLUENT软件获得管内气体流动情况,以水平布置的Gauss-Jacobi声道布局方案中的四声道和45°声平面布置的声道为例,采取逐个积分声道路径上每个网格内声波传播时间从而计算声道流速的方法,得到非轴向速度分量引起的速度测量相对误差。结果表明:声道入射角度的改变对非轴向速度分量引起的相对误差无明显影响;随90°弯头和三通下游直管段的增加,非轴向速度分量引起的相对误差不断减小,90°弯头下游25D(D为管径)后相对误差绝对值基本降至0.1%以内,三通下游30D后降至5%以内;水平布置的声道在测量流速时抗非轴向速度分量干扰能力优于45°声平面布置的声道。研究结果可为提升超声波流量计流体扰动耐受性能提供参考。 展开更多
关键词 超声波流量计 非轴向速度分量 速度测量相对误差 FLUENT Gauss-Jacobi声道布局方案
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Comprehensive modeling approach of axial ultrasonic vibration grinding force 被引量:2
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作者 何玉辉 周群 +1 位作者 周剑杰 郎献军 《Journal of Central South University》 SCIE EI CAS CSCD 2016年第3期562-569,共8页
The theoretical model of axial ultrasonic vibration grinding force is built on the basis of a mathematical model of cutting deforming force deduced from the assumptions of thickness of the undeformed debris under Rayl... The theoretical model of axial ultrasonic vibration grinding force is built on the basis of a mathematical model of cutting deforming force deduced from the assumptions of thickness of the undeformed debris under Rayleigh distribution and a mathematical model of friction based on the theoretical analysis of relative sliding velocity of abrasive and workpiece. Then, the coefficients of the ultrasonic vibration grinding force model are calculated through analysis of nonlinear regression of the theoretical model by using MATLAB, and the law of influence of grinding depth, workpiece speed, frequency and amplitude of the mill on the grinding force is summarized after applying the model to analyze the ultrasonic grinding force. The result of the above-mentioned law shows that the grinding force decreases as frequency and amplitude increase, while increases as grinding depth and workpiece speed increase; the maximum relative error of prediction and experimental values of the normal grinding force is 11.47% and its average relative error is 5.41%; the maximum relative error of the tangential grinding force is 10.14% and its average relative error is 4.29%. The result of employing regression equation to predict ultrasonic grinding force approximates to the experimental data, therefore the accuracy and reliability of the model is verified. 展开更多
关键词 cutting deformation force ultrasonic vibration assisted grinding (UVAG) regression equation comprehensive modeling
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Rebound behaviors of droplets impacting on a superhydrophobic surface 被引量:4
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作者 HU HaiBao CHEN LiBin +1 位作者 HUANG SuHe SONG BaoWei 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2013年第5期960-965,共6页
The rebound behaviors of droplets impacting on a self-fabricated superhydrophobic brass surface (WCA=I64.5°) were ob- served and studied by using high-speed-camera. In accordance with energy conversion, theoret... The rebound behaviors of droplets impacting on a self-fabricated superhydrophobic brass surface (WCA=I64.5°) were ob- served and studied by using high-speed-camera. In accordance with energy conversion, theoretical analysis of different behav- iors and rebound mechanism were given. At lower velocities, three behaviors in different velocity ranges were observed: par- tial rebounding, entire rebounding and ejecting during rebounding. At higher velocities, such two behaviors as rebound after splashing and rebound, ejecting after splashing, occurred alternately and exhibited certain periodicity. A function to predict the critical impact velocity is derived from energy conservation condition, and the prediction values tally with the experimental values, with the maximum relative error about 14%. 展开更多
关键词 SUPERHYDROPHOBIC droplets REBOUND critical impact velocity
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