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RISS 인기검색어
- 검색키워드
- 저자 : Quanzhao Wang (검색결과 3 건)
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Study on micro-grinding mechanism and surface quality of high-volume fraction SiCp/Al composites
Qi Gao,Guangyan Guo,Quanzhao Wang 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.7
SiCp/Al composites contain fine reinforcing particles with high hardness and rigidity, which makes the processing more difficult. The surface roughness prediction model was established and the micro-grinding mechanism was revealed. A non-homogeneous finite element simulation model for the high-volume fraction SiCp/Al composites grinding process was established. Based on the response surface method (RSM), an electroplated diamond grinding rod with a diameter of 1 mm was used to conduct micro-grinding experiments on SiCp/Al composite materials whose SiC particles accounted for 60 %. The results show that the spindle speed has the most significant influence on the surface roughness, followed by grinding depth and feed rate. The minimum surface roughness of micro-grinding is 0.51 μm. Based on the analysis of micro-grinding simulation model and the surface morphology detected by scanning electron microscopy, the grinding mechanism of high-volume fraction SiCp/Al composites were put forward which mainly embodied in brittle fracture and pull-out of particles.
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Study on micro-grinding mechanism and surface and subsurface quality of 20 vol% SiCp/Al composites
Xunyu Yin,Qi Gao,Quanzhao Wang,Ye Chen,Tianyang Cui,Ke Zhang 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.1
A finite element model of single abrasive grinding was established to analyze the material removal during the grinding process and analyze the surface and subsurface defects of the material after grinding. Using the orthogonal test method to machine the surface of the workpiece with a grinding rod of 2 mm grinding head diameter, and to investigate the influence degree of the machining parameters on the roughness. It was concluded that the grinding depth has the most significant effect on surface roughness, followed by the spindle speed and the feed speed, and the minimum roughness of the ground surface obtained was 0.066 μm. The rough surface was simulated by the digital filtering method based on fast Fourier transform (FFT), and the morphological characteristics of the rough surface at Ra = 0.116 μm were described, and the simulated surface was consistent with the detected surface. The laser scanning confocal microscope (LSCM) and scanning electron microscope (SEM) were used for inspection, and the analysis showed that the main removal forms of the enhanced particles were broken, fractured, and pulled out. The surface defects were cracks, pits, and burrs, and the subsurface damages were voids, cracks, and pits.
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Adaptive robust target tracking control of marching tank under high-speed maneuvering condition
Cong Li,Guolai Yang,Xiuye Wang,Yuze Ma,Liqun Wang,Quanzhao Sun 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.6
This paper focuses on the problem of target tracking control of marching tanks under the condition of high-speed maneuver based on sliding mode disturbance observer. First, the dynamic model of marching tank is established by using multi-body dynamics software. The nonlinear factors such as barrel flexibility, clearance between barrel and bushing, and uncertainty sources such as road excitation are considered. Second, the mechatronics model of tank bidirectional stabilization system considering transmission clearance and friction is established in numerical simulation software. Aiming at the tank bidirectional stabilization system, an adaptive robust controller based on sliding mode disturbance observer is designed. Finally, the real-time control and target tracking of the tank bidirectional stabilization system are realized by co-simulation. The results show that the sliding mode disturbance observer improves the stability accuracy of the system by 43.22 %. Comparing the simulation results with the PID control, the controller designed in this paper has the characteristics of rapid tracking speed and high robustness, and the advantage is more obvious under the condition of highspeed maneuver.
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