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Investigation on Normal Dynamic Contact Characteristics of Mechanical Interface of Machine Tools
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作者 Zhiqiang Gao Weiping Fu +3 位作者 Wen Wang Shuangqi Wang Dongya Zhang Zhifei Xue 《Acta Mechanica Solida Sinica》 SCIE EI CSCD 2021年第1期104-123,共20页
The dynamic contact characteristics of mechanical interface significantly impact the performance of machine tools.The static contact behaviors of mechanical interface have been studied.However,most mechanical interfac... The dynamic contact characteristics of mechanical interface significantly impact the performance of machine tools.The static contact behaviors of mechanical interface have been studied.However,most mechanical interfaces are exposed to dynamic load.It is necessary to study the dynamic contact characteristics of mechanical interface.A normal dynamic microcosmic contact model is built using the statistical method,and the interactional effects of adjacent asperities are considered.The influences of the normal preload,vibrational frequency and displacement amplitude on normal contact stiffness and damping of mechanical interface are revealed.The predicted contact stiffness and damping of mechanical interface are verified by a series of simulations and experiments. 展开更多
关键词 Dynamic STIFFNESS DAMPING Asperity interaction EXPERIMENT
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A New Road Extraction Method from Satellite Images Using Genetic Programming
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作者 Jing Liang Yaxin Chang +3 位作者 Ying Bi Caitong Yue Boyang Qu Mengnan Liu 《Guidance, Navigation and Control》 2024年第2期47-79,共33页
Extracting roads from satellite images is an important task in thefield of computer vision with a wide range of applications.However,efficient road extraction from satellite images remains a complex challenge due to i... Extracting roads from satellite images is an important task in thefield of computer vision with a wide range of applications.However,efficient road extraction from satellite images remains a complex challenge due to issues such as data labeling and the diversity of road features.Existing methods often struggle to balance accuracy,robustness,and interpretability.Genetic programming(GP)is based on aflexible and interpretable structure that is robust and does not require a large amount of data support.We position the road extraction problem as a binary semantic segmentation task and introduce GP algorithms.First,an approach for extracting pixel neighborhood features is proposed,and features from multiple images in the DeepGlobe road extraction dataset are extracted.Then,an advanced feature construction method based on GP is employed.Finally,these advanced features are utilized for training classifier and classi-fication to achieve road extraction.We have validated the effectiveness of the approach on the DeepGlobe road extraction dataset.The results demonstrated that the proposed approach exhibits superior performance compared to traditional classification methods and multilayer perceptron(MLP)in terms of accuracy,generalization,and interpretability.This study provides a valuable reference for the integration of GP into the domain of road extraction from satellite images,showcasing their potential to enhance the accuracy and efficiency. 展开更多
关键词 Road extraction genetic programming feature construction
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