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磨料水射流铣削钛合金深度与表面粗糙度研究
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作者 杜航 熊杰 +2 位作者 陈炜 李登 巫世晶 《机械科学与技术》 CSCD 北大核心 2023年第7期1063-1069,共7页
磨料水射流铣削技术柔性大、工艺参数复杂,其加工性能难以有效控制。针对这一问题,本文首先通过响应曲面法研究了磨料水射流铣削钛合金时典型工艺参数对铣削深度和表面粗糙度的影响,并采用传统回归方式建立了经验预测模型;其次在结合磨... 磨料水射流铣削技术柔性大、工艺参数复杂,其加工性能难以有效控制。针对这一问题,本文首先通过响应曲面法研究了磨料水射流铣削钛合金时典型工艺参数对铣削深度和表面粗糙度的影响,并采用传统回归方式建立了经验预测模型;其次在结合磨粒磨损理论、高斯轮廓模型和表面成形分析的基础上,进一步建立了铣削深度和表面粗糙度的半经验预测模型;然后利用实验数据进行了参数标定;最后通过实验验证和对比了两种模型。结果表明,两种预测模型的平均误差均小于15%,相比经验模型,半经验模型既可以解释参数影响和铣削机理,又可以保证预测的准确率和稳定性,对于控制铣削深度和表面质量具有重要价值。 展开更多
关键词 磨料水射流铣削 钛合金 预测模型 磨粒磨损理论 高斯轮廓
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General moving objects recognition method based on graph embedding dimension reduction algorithm 被引量:1
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作者 Yi ZHANG Jie YANG Kun LIU 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2009年第7期976-984,共9页
Effective and robust recognition and tracking of objects are the key problems in visual surveillance systems. Most existing object recognition methods were designed with particular objects in mind. This study presents... Effective and robust recognition and tracking of objects are the key problems in visual surveillance systems. Most existing object recognition methods were designed with particular objects in mind. This study presents a general moving objects recognition method using global features of targets. Targets are extracted with an adaptive Gaussian mixture model and their silhouette images are captured and unified. A new objects silhouette database is built to provide abundant samples to train the subspace feature. This database is more convincing than the previous ones. A more effective dimension reduction method based on graph embedding is used to obtain the projection eigenvector. In our experiments, we show the effective performance of our method in addressing the moving objects recognition problem and its superiority compared with the previous methods. 展开更多
关键词 Moving objects recognition Adaptive Gaussian mixture model Principal component analysis Linear discriminant analysis Marginal Fisher analysis
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