Dr. Zhipeng Sheng Profile

Dr. Zhipeng Sheng

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Proceedings Article | 27 January 2023 Paper

Dual-surface li-ion battery deformation measurement by temporal electronic speckle pattern interferometry

Kunhan Yang, Zhipeng Sheng, Bing Chen, Xiaoyu Li, Yu Fu

Proceedings Volume 12550, 125501S (2023) https://doi.org/10.1117/12.2667169

KEYWORDS: Batteries, Deformation, Gaussian filters, Fourier transforms, Phase unwrapping, Safety, Phase shifts

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he safety, performance, and lifetime of lithium-ion cells are critical for the acceptance of electric vehicles (EVs), but non-destructively evaluating cell quality issues is not easy. In recent studies, batterie's deformation measurement by optical methods is a promising candidate for detecting a possible local failure originating from mechanical and current inhomogeneities or potential gradients. However, the existing measurement techniques, such as laser scanning and digital image correlation, cannot achieve high-precision deformation measurement up to submicron. In this study, a temporal electronic speckle pattern interferometry (ESPI) is proposed to acquire out-of-plane deformation of both surfaces of a commercial Li-ion polymer battery simultaneously. Various data processing techniques, such as the Fourier and windowed Fourier transform (WFT) methods, are applied in temporal and spatial domains to extract the out-of- displacement during the battery charging process. High-precision deformation of both surfaces can be obtained during the charging process. The result shows that temporal ESPI can be a helpful tool to offer high-precision data for optimizing the Li-ion batteries model.

Proceedings Article | 27 January 2023 Paper

Modal shapes measurements of a rotating disc using stroboscopic 3D digital image correlation and down-sampling strategy

Ruixin Lin, Zhipeng Sheng, Bing Chen, Zeren Gao, Yu Fu

Proceedings Volume 12550, 1255017 (2023) https://doi.org/10.1117/12.2667027

KEYWORDS: Digital image correlation

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Rotating machinery plays an essential role in aerospace, energy, automotive, and other industries. A resonance phenomenon will occur if the rotational speed of the structure is close to its critical speed. Experimental analysis of the modal shapes of a rotating component at critical speeds can improve its design and performance in applications. Full-field deformation measurements of a rotating structure can be realized by three-dimension digital image correlation(3D-DIC) based on high-speed cameras. However, high-speed cameras are too expensive to apply widely. This study presents a method using 3D-DIC and a down-sampling strategy, which only uses low-cost normal-speed cameras. In order to ensure that two low-speed cameras can synchronously capture images clearly, a synchronous stroboscopic device is used. A measurement experiment was executed on a rotating disc at a critical speed to verify the availability of the method. The experiments show that the out-of-plane displacement of a rotating disc at different critical speeds corresponds to the various orders of modal shape. Compared with the non-resonance state, the out-of-plane deformation of the rotating disc was significant. The results also show the proposed method is a low-cost, non-contact experimental tool to study the dynamic behavior of a rotating component.

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