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Your search keyword '"Gao Zhiyuan"' showing total 844 results
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844 results on '"Gao Zhiyuan"'

1. Ultra-high frequency vibration fatigue of DD6 single crystal superalloy simulating thin-walled specimens

Author

GAO Zhiyuan, CHEN Haohui, CHEN Xin, ZHONG Chaofeng, ZHANG Yue, HU Jiangkun, XU Wei, and HE Yuhuai

Subjects
dd6 single crystal superalloy, thin-walled specimen, uhf vibration fatigue, very high cycle fatigue s-n curve, fracture mechanism, Motor vehicles. Aeronautics. Astronautics, TL1-4050
Abstract

The effect of specimen thickness on the very high cycle fatigue （VHCF） properties of DD6 nickel-based single crystal superalloys for turbine blades with hollow air-cooled structure was investigated. Based on the finite element method （FEM）, a thin-walled vibration fatigue specimen with a thickness of 0.5 mm was designed with a natural frequency of 1425 Hz, which was a suitable test efficiency for VHCF test. The VHCF test was carried out by electrodynamic shaker at room temperature, and a VHCF S-N curve up to 109 cycles was obtained. Comparing with the rotational bending fatigue and vibration fatigue test data of conventional size specimens, the results show that the fatigue strength of DD6 single crystal superalloy continues to decrease after 107 cycles and the fatigue strength is decreased about 25%，from 107 to 109 cycles; The high cycle fatigue strength of the thin-walled specimen is basically the same as the standard rotary bending fatigue strength of the same material, and slightly lower than the conventional vibration fatigue strength. The cracks in the thin-walled specimen initiate on the surface of the dangerous section, showing the characteristics of line source. There are two propagation planes in the fatigue growth zone, showing the characteristics of cleavage like.

Published
2023
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2. Skyeyes: Ground Roaming using Aerial View Images

Author

Gao, Zhiyuan, Teng, Wenbin, Chen, Gonglin, Wu, Jinsen, Xu, Ningli, Qin, Rongjun, Feng, Andrew, and Zhao, Yajie

Subjects
Computer Science - Computer Vision and Pattern Recognition
Abstract

Integrating aerial imagery-based scene generation into applications like autonomous driving and gaming enhances realism in 3D environments, but challenges remain in creating detailed content for occluded areas and ensuring real-time, consistent rendering. In this paper, we introduce Skyeyes, a novel framework that can generate photorealistic sequences of ground view images using only aerial view inputs, thereby creating a ground roaming experience. More specifically, we combine a 3D representation with a view consistent generation model, which ensures coherence between generated images. This method allows for the creation of geometrically consistent ground view images, even with large view gaps. The images maintain improved spatial-temporal coherence and realism, enhancing scene comprehension and visualization from aerial perspectives. To the best of our knowledge, there are no publicly available datasets that contain pairwise geo-aligned aerial and ground view imagery. Therefore, we build a large, synthetic, and geo-aligned dataset using Unreal Engine. Both qualitative and quantitative analyses on this synthetic dataset display superior results compared to other leading synthesis approaches. See the project page for more results: https://chaoren2357.github.io/website-skyeyes/.

Published
2024

3. Geometry-aware Feature Matching for Large-Scale Structure from Motion

Author

Chen, Gonglin, Wu, Jinsen, Chen, Haiwei, Teng, Wenbin, Gao, Zhiyuan, Feng, Andrew, Qin, Rongjun, and Zhao, Yajie

Subjects
Computer Science - Computer Vision and Pattern Recognition
Abstract

Establishing consistent and dense correspondences across multiple images is crucial for Structure from Motion (SfM) systems. Significant view changes, such as air-to-ground with very sparse view overlap, pose an even greater challenge to the correspondence solvers. We present a novel optimization-based approach that significantly enhances existing feature matching methods by introducing geometry cues in addition to color cues. This helps fill gaps when there is less overlap in large-scale scenarios. Our method formulates geometric verification as an optimization problem, guiding feature matching within detector-free methods and using sparse correspondences from detector-based methods as anchor points. By enforcing geometric constraints via the Sampson Distance, our approach ensures that the denser correspondences from detector-free methods are geometrically consistent and more accurate. This hybrid strategy significantly improves correspondence density and accuracy, mitigates multi-view inconsistencies, and leads to notable advancements in camera pose accuracy and point cloud density. It outperforms state-of-the-art feature matching methods on benchmark datasets and enables feature matching in challenging extreme large-scale settings.

Published
2024

4. Transfer Characteristic Analysis and Experimental Research of Asynchronous Axial Magnetic Coupler at High Speed

Author

Li Wanjie, Zhang Guomin, Ai Liwang, Liu Guole, and Gao Zhiyuan

Subjects
Asynchronous axial magnetic coupler, Finite element, Transfer characteristic, Temperature rise characteristic, Mechanical engineering and machinery, TJ1-1570
Abstract

The torque of magnetic couplers can be transferred by utilizing the magnetic field coupling,which changes the rigid connection into non-contact soft connection. It has the advantages of soft starting,vibration reduction,locked-rotor protection,high reliability,and is applied in industry. The magnetic couplers can also be used in specific conditions,such as superconducting flywheel energy storage system（ SFESS）,which can realize the motor placed out of vacuum chamber with no need for stator cooling system,the completely dynamic sealing of vacuum chamber,and long time energy storage. Due to rare application and research in the condition of high speed for magnetic couplers,the transfer characteristics at high speed of asynchronous axial magnetic coupler is studied based on the application of SFESS. The finite element model is built by using the general simulation method based on slip speed,the performance parameters of transferred torque,axial force,and magnetic flux density in the air-gap are calculated,and the temperature rise characteristic of critical components is analyzed. The prototype is manufactured,and the test platform of transfer characteristics at high speed is established. The experiments are conducted at the synchronous speed 9 500 r/min and the conventional modeling method is validated by comparing the experimental results with simulated results. Also the torque transfer characteristic at various speeds is compared. The feasibility of asynchronous axial magnetic coupler for high speed application is validated.

Published
2018
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6. Comparison of secondary equipment redundancy configuration of smart substations in China and overseas

Author

Yuan Hao, Chen Min, Qu Gang, Gao Zhiyuan, and Qiu Yutao

Subjects
Environmental sciences, GE1-350
Abstract

This paper introduces the overseas smart substation technology scheme, describes the communication network architecture and equipment redundancy configuration in the typical overseas test smart substation scheme, and compares the similarities and differences between China’s smart substation redundancy configuration technology and the overseas smart substation configuration technology. The distribution of measurement and control functions of overseas smart substations that are different from China’s designs are explained in detail. The different architectures of overseas smart substations and China’s smart substations are illustrated. Finally, the suggestions of overseas Smart Substation and China’s smart substation are summarized.

Published
2021
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42. Obstacles in continuous cropping: Mechanisms and control measures

Author

Ma, Zhimin, primary, Guan, Zhengjun, additional, Liu, Qingchang, additional, Hu, Yaya, additional, Liu, Lanfu, additional, Wang, Baoqing, additional, Huang, Lifei, additional, Li, Huifeng, additional, Yang, Yufeng, additional, Han, Meikun, additional, Gao, Zhiyuan, additional, and Saleem, Muhammad, additional

Published
2023
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