Papers by Author: Yi Shan Pan

Abstract: This article touches on the problem that the shock occurs on support at the time of violent vibration and deformation failure of the surrounding rocks. According to the buckling principle, a thin-walled energy-absorption component is designed with special shape applied to a new roadway anti-impact and energy-absorbing hydraulic support in order to relieve excess load impact and injuring and damage by itself and the traits abdicating deformation process and when impact of surrounding rock occurring suddenly, thus preventing support system from the serious damage caused by rock burst. In the theory, simplified energy-absorbing component capacity and energy-absorption formula are obtained by the theory analysis, the effect of energy-absorption curve and the buckling deformation mode are obtained in the quasi-static compression test, results are almost the same with simulation and provide certain reference for the optimization design of support.

Abstract: In this paper, a research of precision CNC turning center’s spindle is presented. Spring damper elements are used to simulate the supports of dynamic and static hydraulic bearing, and the 3D finite element models of the spindle is built. Based on finite element models of spindle, the static analysis and model analysis are performed, and the static stiffness, natural frequency and modes of vibration are put forward. The strain and stress of spindle is explored, and mode of vibration of spindle under resonance and designed working conditions is contrasted.

Abstract: Aiming at the problems of high stress, poor permeability and low gas drainage rate in deep mining, An integrative equipment is designed with high-pressure water jet, based on the principle of drilling, slotting, pressure relief and improving permeability together with the high-pressure water jet. This equipment can realize high-pressure drilling, low pressure punching, 360° high-pressure slotting and so on. In the multifunctional spray head, more slotting nozzle sections improve the slotting efficiency; also enhance the press-relief and permeability effect. The noise elimination cover decreases machine noise and improves the work environment. This equipment has important significance to improve gas drainage rate and prevent the dynamic catastrophe of the coal-bed.

Abstract: In order to gain a deep understanding of energy absorption property and failure mechanism of closed-cell foam metals, the dynamic energy absorption property of closed-cell foam metals with matrix Al, matrix Al-Si6, matrix Al-Si12 CCAF, Mg matrix, aluminum-fiber and RE-Al alloys are discussed based on the compression and energy absorption test. The influence of different basis materials on absorption property of closed-cell foam metals is discussed, too. It also shows the micro topography of CCAF during the compression process. In addition, micro-mechanics failure mechanism of CCAF is discussed. Results obtained in this research include: (1) the compression deformation curves of different foam metals indicate that matrix Al CCAF is better for energy absorption materials, because of the best energy absorption property and the high strength. (2) the strength of metal foams with matrix Al-Si6, matrix Al-Si12 and matrix Mg are higher than that of matrix Al CCAF, and also have better energy absorption property. However, the failure characteristics of brittle fracture indicate obvious in matrix Al-Si6, matrix Al-Si12 and matrix Mg. (3) the micro-topography of CCAF with matrix Al is simple and uniform. Also the fracture has obvious tear trace. Aluminum-fiber and RE-Al alloys have better compression property, but lower strength and no strength increasing stage lead to destroy suddenly. (4) the curves of energy absorption for matrix Al and matrix Al-Si6CCAF are on the rise. And the maximum of energy absorption is about 2.1MJ/m³. (5) micropore and crack of closed-cell foam metals provide a good space for the compression and energy absorption. Meanwhile, it is the main failure parts of damage. Keywords: closed-cell foam metal; dynamic energy absorption; micro-topography; micro-mechanics