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2 results on '"Weike Zheng"'

1. Predicting the state of health of VRLA batteries in UPS using data-driven method

Author

Yitong Shang, Weike Zheng, Xiaoyun Yan, Dinh Hoa Nguyen, and Linni Jian

Subjects
Data center, Battery state of health, Coup De Fouet phenomenon, Data-driven method, Electrical engineering. Electronics. Nuclear engineering, TK1-9971
Abstract

Uninterruptible power battery (UPS) is an important part to ensure the stable operation of data center. Its security is related to the reliability and stability of power system. Among them, the state of health (SOH) prediction is a key issue of the valve regulated lead–acid (VRLA) battery operation and maintenance in data center. In this work, the battery SOH is predicted by the correlation between the nadir voltage value of Coup De Fouet (CDF) phenomenon and SOH. Then, the CDF phenomenon is combined with popular data-driven methods, such as linear regression, regression tree, support-vector machine, gaussian process, neural network, to predict battery SOH through 215 features. Finally, the above method is verified with the real discharge dataset of UPS battery in data center. The experimental results show that the data-driven method combining big data has higher accuracy than the simple prediction of battery SOH based on the nadir voltage value of CDF phenomenon and its variants.

Published
2023
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2. Characterization and Finite Element Modeling for Thermoset Resin of Carbon Fiber Prepregs During Curing

Author

Yuncong Feng, Weike Zheng, Zizhao Zhao, Biao Liang, Haitao Ye, Qi Ge, Xiangyi Zhang, and Weizhao Zhang

Subjects
Control and Systems Engineering, Mechanical Engineering, Industrial and Manufacturing Engineering, Computer Science Applications
Abstract

In this study, an epoxy resin, YZ-05, designed specifically for carbon fiber reinforced polymer prepregs, was characterized and modeled. A degassing method for the highly viscous YZ-05 was established for specimen preparation. To numerically model the behavior of YZ-05 in curing, several components, including the heat transfer, curing kinetics, and viscoelastic constitutive law ones, were developed, and the corresponding material properties to be input were tested. As YZ-05 shows severe creep at high temperature under mechanical loading, the combination of digital image correlation (DIC) and thermography technique was utilized to obtain its thermal expansion and chemical shrinkage. In the aspects of viscoelastic behavior, stress relaxation tests were performed based on time–temperature superposition principle with a numerical method to calculate shift factors. After development and input identification, these modeling components for YZ-05 resin were integrated and the modeling results were validated using experiments, where bending of resin beams was induced during curing.

Published
2022

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