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117 results on '"Gao, Chenghui"'

19. ANALYSIS OF SURFACE TEMPERATURE IN SLIDING CONTACT WITH TWO FRACTAL SURFACES

Author

LAI LianFeng, GAO ChengHui, and HUANG JianMeng

Subjects
Sliding model, Thermo-mechanical coupling, Material failure, The interface shear strength, The highest temperature, Mechanical engineering and machinery, TJ1-1570, Materials of engineering and construction. Mechanics of materials, TA401-492
Abstract

A three-dimensional sliding model of micro-scale was established between two rough surfaces exhibiting fractal behavior,and the thermo-mechanical coupling factor in the process of contact was considered. The surface temperature in sliding processes was analysed using the finite element analysis taking into account Ti-6Al-4V elastic-plastic properties with material failure. The transient surface temperature distribution of the rough surface was presented. The numerical results showed that the surface temperature in initial time rise sharply and then tend to be temporarily stable until a new contacted asperity coming into interaction. With the increase of friction slide distance the surface temperature was to present the state of fluctuating. The values of highest temperature at contact zones were different,while the highest temperature at contact zone was higher relative to the greater interface shear strength. Compared with the experimental data of the literatures,it was concluded that the rationality of the simulation,these results also deepened understanding the reason of the friction and wear.

Published
2015
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21. DT-CWT Robust Filtering Algorithm for The Extraction of Reference and Waviness from 3-D Nano Scalar Surfaces

Author

Ren Zhi Ying., Gao ChengHui., Han GuoQiang., Ding Shen, and Lin JianXing.

Subjects
3-d nano scale, dt-cwt robust filtering, reference, waviness, Mathematics, QA1-939
Abstract

Dual tree complex wavelet transform (DT-CWT) exhibits superiority of shift invariance, directional selectivity, perfect reconstruction (PR), and limited redundancy and can effectively separate various surface components. However, in nano scale the morphology contains pits and convexities and is more complex to characterize. This paper presents an improved approach which can simultaneously separate reference and waviness and allows an image to remain robust against abnormal signals. We included a bilateral filtering (BF) stage in DT-CWT to solve imaging problems. In order to verify the feasibility of the new method and to test its performance we used a computer simulation based on three generations of Wavelet and Improved DT-CWT and we conducted two case studies. Our results show that the improved DT-CWT not only enhances the robustness filtering under the conditions of abnormal interference, but also possesses accuracy and reliability of the reference and waviness from the 3-D nano scalar surfaces.

Published
2014
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44. Merge measuring mesh for complex surface parts.

Author

Ye, Jianhua, Gao, Chenghui, Zeng, Shoujin, Xu, Mingsan, Liu, Lin, Yang, Can, and Ke, Jianfeng

Subjects
*MESH networks, *TRIANGLES, *GRID computing, *SCANNING systems, *TOPOLOGY
Abstract

Due to most parts self-occlude and limitation of scanner range, it is difficult to scan the entire part by one time. For modeling of part, multi measuring meshes need to be merged. In this paper, a new merge method is presented. At first, using the grid voxelization method to eliminate the most of non-overlap regions, and retrieval overlap triangles method by the topology of mesh is proposed due to its ability to improve the efficiency. Then, to remove the large deviation of overlap triangles, deleting by overlap distance is discussion. After that, this paper puts forward a new method of merger meshes by registration and combination mesh boundary point. Through experimental analysis, the suggested methods are effective. [ABSTRACT FROM AUTHOR]

Published
2018
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