http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Approach for Decoupling the Non-Linear Cross-Talk in a Six-Dimensional Force Platform
Zhiyong Mao,Ping Cai,Dian Wang,Rui Ji 한국정밀공학회 2016 International Journal of Precision Engineering and Vol.17 No.3
As the primary equipment for balance function assessment, the six-dimensional force platform (SDFP) should maintain its quality for long term use. Unfortunately the inevitable cross-talk will deteriorate its comprehensive performance. Obtaininga new sensitivity coefficient matrix through re-calibration is an effective way to guarantee the measurement accuracy. Generalized force loading can be used for in-situ calibration, but the calibration result depends on the selected set of loading point when the components are nonlinearly coupled.This study attempts to find an appropriate loading point set to obtain the optimal decoupling matrix for the SDFP when non-linearcoupling exists. The decoupling design of strain gauge layout and the non-linear coupling resulting from the bending deformation of the top plate are analyzed. Based on the analysis, a digital simulation is conducted to investigate the relationship between the decoupling performance and the selection of the loading points. The simulation results show that the center distance of the loading point is the primary factor affecting the decoupling performance. An in-situ calibration is conducted, and the orthogonal test rule is used to evaluate the performance of the system. A comparison of the results shows that the experimental results agree with those of the simulations.
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.
Design and dimension optimization of cutter disassembly mechanism for shield tunneling machine
Yi-Min Xia,Mei Yang,Zhiyong Ji,Lianhui Jia,Zixiong Zhou,Dun Wu 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.7
This study focuses on configuration and dimension optimization of cutter disassembly mechanism. Firstly, a cutter disassembly mechanism configuration is proposed with four components and simple actions, based on the theory of inventive problem solving (TRIZ) contradiction solutions. Furthermore, a comprehensive dimension optimization strategy was developed, including non-dimensional normalization model, kinematic performance atlases and fuzzy comprehensive evaluation method. Then, the optimal relative dimension of crucial parameters was obtained. Combined with the assembly relationship between components, dimension of all parameters was designed for cutter disassembly mechanism. The locking and disassembling process simulation was provided to illustrate the feasibility of the mechanism. The results show that the angular velocity is very smooth and the locking and disassembling actions are realizable without interference for optimized cutter disassembly mechanism. The effectiveness of the configuration and dimension optimization method is validated.