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Performance assessment and structural design of the atmospheric cutterhead of slurry shield machine
Feixiang Liu,Qingyang Wang,Zhiyong Ji,Laikuang Lin 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.11
The atmospheric cutterhead is a new type of cutterhead with high technical difficulty. Compared with the conventional cutterhead, the spatial structure of the atmospheric cutterhead is more complicated, and a mature design theory has not yet been formed. This paper presents an atmospheric cutterhead design method for slurry shield machines. The method was divided into three steps: (i) design load analysis; (ii) multiobjective topology optimization; and (iii) evaluation and selection of cutterhead structures. Based on topology optimization theory, four types of cutterhead structures with different numbers of radial arms are obtained. The performance of the cutterhead was evaluated by stress, deformation, vibration mode, opening situation and space complexity, and the five-radial arm cutterhead was determined to be the best solution. Analysing the actual tunnelling parameter data shows good engineering adaptability. This paper provides a reference for the optimal design of the atmospheric cutterhead of slurry shield machine.
Mengqi Wang,Kaiyue Zhang,Feixiang Ji,Yurong Guo,Chao Wang,Shiping Wang,Ya Chu,Guangjiu Zhao 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.104 No.-
A water-soluble probe composite material (CDs/ZnO) was synthesized by microwave pyrolysis methodsof citric acid, urea and zinc oxide (ZnO) with aggregation-induced emission activity. We creatively realizedthe composite of CDs and nano-ZnO in the form of foam, then used as bactericide for the first timeand showed excellent antibacterial properties. Also, the composite materials overcame the problem ofaggregation-induced quenching (ACQ) and realized solid-state emission. The materials had two differentemission centers, and the two emission peaks were varied with the change of excitation wavelength. Furthermore, Methyl red (MR) showed fluorescence quenching for CDs/ZnO with obvious linear correlation,which demonstrated potential in the measurement of MR in dyeing wastewater. The CDs/ZnO weobtained perfectly inherited the advantages of CDs and nano ZnO, it has not just no cytotoxicity to cells,but also has a good killing effect on bacteria. Hence, this work shows significant adaptable fluorescencebasedprotocol with enormous potential applications in biology.