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18 results on '"Gu, Xiangfeng"'

14. Polycube Shape Space

Author

Zhao, Hui, primary, Li, Xuan, additional, Wang, Wencheng, additional, Wang, Xiaoling, additional, Wang, Shaodong, additional, Lei, Na, additional, and Gu, Xiangfeng, additional

Published
2019
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15. Rotational energy harvesting systems using piezoelectric materials: A review

Author

Lipeng He, Shuo Yang, Wang Pingkai, Guanggming Cheng, Wang Zhe, Wang Shicheng, and Gu Xiangfeng

Subjects
010302 applied physics, Computer science, Electric potential energy, Rotation around a fixed axis, Mechanical engineering, USable, 01 natural sciences, Piezoelectricity, 010305 fluids & plasmas, Power (physics), Rotational energy, Hybrid system, 0103 physical sciences, Instrumentation, Energy harvesting
Abstract

In the past few decades, rotary energy harvesting has received more and more attention and made great progress. The energy harvesting device aims to collect environmental energy around electronic equipment and convert it into usable electrical energy, developing self-powered equipment that does not require replaceable power supplies. This paper provides a holistic review of energy harvesting techniques from rotary motion using piezoelectric materials. It introduces the basic principles of piezoelectric energy harvesting, the vibrational modes of piezoelectric elements, and the materials of piezoelectric elements. There are four types of rotational energy harvesting technologies: inertial excitation, contact execution, magnetic coupling, and hybrid systems. An overview of each technology is made, and then, a detailed analysis is carried out. Different types of rotating energy harvesting technologies are compared, and the advantages and disadvantages of each technology are analyzed. Finally, this paper discusses the future direction and goals of improving energy harvesting technology. This Review will help researchers understand piezoelectric energy harvesting to effectively convert rotational energy into electrical energy.

Published
2021

18. Silhouette Mapping

Author

Gu, Xiangfeng, Gortler, Steven J., Hoppe, Hugues, McMillan, Leonard, Brown, Benedict J., and Stone, Abraham D.

Abstract

Recent image-based rendering techniques have shown success in approximating detailed models using sampled images over coarser meshes. One limitation of these techniques is that the coarseness of the geometric mesh is apparent in the rough polygonal silhouette of the rendering. In this paper, we present a scheme for accurately capturing the external silhouette of a model in order to clip the approximate geometry. Given a detailed model, silhouettes sampled from a discrete set of viewpoints about the object are collected into a silhouette map. The silhouette from an arbitrary viewpoint is then computed as the interpolation from three nearby viewpoints in the silhouette map. Pairwise silhouette interpolation is based on a visual hull approximation in the epipolar plane. The silhouette map itself is adaptively simplified by removing views whose silhouettes are accurately predicted by interpolation of their neighbors. The model geometry is approximated by a progressive hull construction, and is rendered using projected texture maps. The 3D rendering is clipped to the interpolated silhouette using stencil planes., Engineering and Applied Sciences

Published
1999

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