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146 results on '"Liu, Fujia"'

8. An Improved Comprehensive Evaluation Method of Road Passenger Transportation Safety

Author

Dong, Guoliang, Liu, Fujia, Xia, Haiying, Chen, Chaozhou, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Jiming, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Hirche, Sandra, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Li, Yong, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Möller, Sebastian, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zamboni, Walter, Series Editor, Zhang, Junjie James, Series Editor, Wang, Wuhong, editor, Chen, Yanyan, editor, He, Zhengbing, editor, and Jiang, Xiaobei, editor

Published
2022
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24. Identification of material parameters at high strain rates using ballistic impact tests and inverse finite element analysis.

Author

Levadnyi, Ievgen, Liu, Fujia, and Gu, Yaodong

Subjects
*STRAIN rate, *FINITE element method, *IMPACT testing, *PARAMETER identification, *IMPACT (Mechanics), *IRON & steel plates, *DUCTILE fractures
Abstract

Material models play a crucial role in finite element analysis, especially for evaluating deformations under high strain rates. This study introduces a straightforward method that combines experiments, numerical simulations, and optimization to identify the parameters of a ductile material model at high strain rates. We conduct ballistic impact tests using a single-stage light gas gun and spherical projectiles on Q235 steel at velocities ranging from 160 to 476 m/s to determine its properties. An iterative inverse finite element analysis helps to refine the Johnson–Cook material model constants, aligning them with the observed crater dimensions on the specimens caused by impacts at various speeds. The model's predictions for the crater profiles show a good match with the experimental findings across all tested velocities. Simulation outcomes reveal high strain values up to 3.81 and strain rates reaching 41 872 s−1. Moreover, we assess the model's failure behavior under high strain rates through both perforation resistance tests and simulations on Q235 steel plates of varying thicknesses under ballistic impacts. The successful validation of the Johnson–Cook model for Q235 steel at these rates confirms the efficacy and reliability of our characterization method. This approach can be applied to develop model parameters for different materials under similar strain conditions. [ABSTRACT FROM AUTHOR]

Published
2024
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31. Compiling method of automobile fault diagnosis information

Author

Wu Guofang, Liu Fujia, and Xu Shuquan

Subjects
automobile, fault, diagnosis, information, Engineering (General). Civil engineering (General), TA1-2040
Abstract

Automobile fault diagnosis is the most technical content in automobile maintenance. The speed, accuracy and convenience of diagnosis directly affect the maintenance efficiency. Automobile fault diagnosis information is an important reference for finding and solving automobile faults. High quality information is the key to improve technical personnel's judgment and solving faults. In this paper, the methods and examples of fault diagnosis information compilation are given to guide the technical data writers to compile effective fault diagnosis information for automobiles.

Published
2022
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47. A Randomized, Double-Blind, Placebo-Controlled, First-in-Human Clinical Trial to Assess Safety, Tolerability, and Pharmacokinetics of LY-CovMab, a Potent Human Neutralizing Antibody Against SARS-CoV-2

Author

Zhang, Qian, primary, Zhou, Renpeng, additional, Yang, Jingjing, additional, Dou, Changlin, additional, Gan, Tianyi, additional, Liu, Fujia, additional, Hu, Baihui, additional, Song, Deyong, additional, Lu, Chao, additional, and Hu, Wei, additional

Published
2021
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50. Research on Service Evaluation of Automobile Inspection and Testing Based on AHP - Fuzzy Comprehensive Evaluation Method

Author

Xu Shuquan, Chen Chaozhou, and Liu Fujia

Subjects
Information management, Service (business), Transport engineering, Index (economics), Ranking, Standardization, Level of service, business.industry, Computer science, Automotive industry, Analytic hierarchy process, business
Abstract

In order to grasp the current status, problems and service weaknesses of automobile inspection and testing services, and to propose service improvement and optimization measures. Five criteria-level indicators and corresponding 14 subdivision indexes of automobile inspection and testing service evaluation index system were established. Through the AHP-fuzzy comprehensive evaluation method of automobile inspection and testing service evaluation model, the index weights are determined and the current status of the automotive inspection and testing service is comprehensively evaluated. The weight ranking of the service indicators is professionalism(B3)>economy(B2)>convenience(B1)>transparency(B5)>comfort(B4), the top three items in the order of the weight of all items are technical interpretation, cost of delay and dress & language. According to the comprehensive evaluation, the total score of the automotive inspection and testing service is 90.65, and the index evaluation score of the criterion layer is ranked as B1>B4>B3>B2>B5, according to 5 levels of service satisfaction reviews and evaluations The total score shows that the service evaluation is generally at a satisfactory level, and the scores of convenience, comfort, economy and other indicators are also above the satisfaction line (>85), this shows that in recent years, the reform of inspection and testing services aimed at reducing costs and increasing efficiency and improving testing services has achieved certain results. For specific indicators, it is proposed that the professional capacity building of inspection and testing services should be continuously strengthened, and the technical interpretation to customers and the level of standardization and standardization of external services should be emphasized, and the information management of inspection and testing services should be strengthened as well.

Published
2020

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