Browsing by Author "Liu, X."

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Citation - Scopus: 5
Research on Spiral Angle Optimization for Longitudinal Road Header's Cutting Head
(SAGE Publications Ltd, 2020) Liu, X.; Du, C.; Liu, M.
The cutting head is the key component of a road header in tunnel excavation, where the concept of the spiral angle design directly affects the comprehensive performance, which includes cutting resistance, fluctuation coefficient, specific energy consumption, cutting head stress distribution, and so on. Based on the theory of rock-breaking by pick, the mechanical model of pick was established, and the three-dimensional force vector in the WORKBENCH coordinate system was determined. The 3D model of the proposed cutting head was designed using PRO/E and the static simulation was carried out using WORKBENCH, while the stress information of key parts was obtained. Furthermore, a four-dimensional fitting method was used to investigate the influence of the horizontal swing speed, rotational speed, and spiral angle of the cutting head, on the stress of the cutting head assembly. By setting the horizontal swing speed, rotational speed and the spiral angle as design variables and the specific energy consumption, total cutting resistance, fluctuation coefficient, power consumption, and stress on cutting head assembly as the objective function; the multiobjective optimization function of the cutting head was established. By using genetic algorithm, the complex problem has been solved. The solution of this optimization function provides the horizontal swing speed, rotational speed, and spiral angle values, where the optimal performance is achieved, in the aspect of energy consumption, cutting resistance, fluctuation coefficient, cutting power, and cutting motor power. This method provides solid guidance and is a great reference in spiral angle design and optimization. © IMechE 2020.
Retraction Notice To “The Investigation of Fe3o4 Atomic Aggregation in a Nanochannel in the Presence of Magnetic Field: Effects of Nanoparticles Distance Center of Mass, Temperature and Total Energy Via Molecular Dynamics Approach” [J. Mol. Liq. 348 (2022) 118400] (Journal of Molecular Liquids (2022) 348, (S0167732221031251), (10.1016/J.molliq.2021.118400))
(Elsevier B.V., 2025) Liu, X.; Fagiry, M.A.; Mohammad Sajadi, S.; Almasri, R.A.; Karimipour, A.; Li, Z.; Ghaemi, F.
This article has been retracted: please see Elsevier Policy on Article Withdrawal (https://www.elsevier.com/about/policies/article-withdrawal). This article has been retracted at the request of the Editor-in-Chief. Post-publication, the editor discovered suspicious changes in authorship between the original submission and the revised version of this paper. The paper was originally submitted by Arash Karimipour (Original First + Corresponding Author). During revision the authors Xinglong Liu (New First Author), Moram A. Fagiry, Radwan A. Almasri, and Zhixiong Li, were all added without the exceptional approval by the journal editor, which is contrary to the journal policy on changes to authorship. The editor reached out to the authors for an explanation, but they failed to provide a satisfactory explanation to these changes. Post-publication, an investigation conducted on behalf of the journal by Elsevier's Research Integrity & Publishing Ethics team also discovered suspicious email addresses used by the authors during submission that were not associated with legitimate researcher accounts. Overall, the editor has determined that the authorship and the findings of the article cannot be relied upon, and has decided to retract the article. The authors disagree with the retraction of the article and dispute the grounds for it. © 2025