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| 1 | Projection micro stereolithography based 3D printing and its applications显示文摘Projection micro stereolithography(PμSL)is a high-resolution(up to 0.6μm)3D printing technology based on area projection triggered photopolymerization,and capable of fabricating complex 3D architectures covering multiple scales and with multiple materials.This paper reviews the recent development of the PμSL based 3D printing technologies,together with the related applications.It introduces the working principle,the commercialized products,and the recent multiscale,multimaterial printing capability of PμSL as well as some functional photopolymers that are suitable to PμSL.This review paper also summarizes a few typical applications of PμSL including mechanical metamaterials,optical components,4D printing,bioinspired materials and biomedical applications,and offers perspectives on the directions of the further development of PμSL based 3D printing technology. | Qi Ge Zhiqin Li Zhaolong Wang Kavin Kowsari Wang Zhang Xiangnan He Jianlin Zhou Nicholas X Fang | 2020 | International Journal of Extreme Manufacturing2020，2，2： | 11 |
| 2 | A new method of combined rock drilling显示文摘Based on the technologies of traditionally mechanical drilling and water jet,we propose a new method of abrasive water jet in combination with rock drilling,and establish a combined rock drilling system for the gas pre-drainage.This study chose the common sandstone and silicon limestone as the rock sample.A series of experiments were completed in the case of dry drilling,existing technology drilling,combined drilling with high pressure water jet and combined drilling with abrasive water jet,respectively.The drilling efficiency and performance were contrasted and analyzed in detail.The results indicate that it is better to choose the method of combined drilling with the high-pressure water jet for soft rocks.The method of combined drilling with abrasive water jet is feasible for the hard rock drilling and has higher drilling efficiency and performance.In this paper,compared with the existing technology,the drilling depth has increased by about 65%,the axial force and torque have reduced by about 14%and 17%,respectively,and the drill wear reduces obviously in the same conditions. | Tang Jiren Lu Yiyu Ge Zhaolong Xia Binwei Sun Huijuan Du Peng | 2014 | International Journal of Mining Science and Technology2014，24，1： | 5 |
| 3 | Progress on the hydraulic measures for grid slotting and fracking to enhance coal seam permeability显示文摘A method of hydraulic grid slotting and hydraulic fracturing was proposed to enhance the permeability of low permeability coal seam in China. Micro-structural development and strength characteristics of coal were analysed to set up the failure criterion of coal containing water and gas, which could describe the destruction rule of coal containing gas under the hydraulic measures more accurately. Based on the theory of transient flow and fluid grid, the numerical calculation model of turbulence formed by high pressure oscillating water jet was used. With the high speed photography test, dynamic evolution and pulsation characteristics of water jet water analysed which laid a foundation for mechanism analysis of rock damage under water jet. Wave equation of oscillating water jet slotting was established and the mechanism of coal damage by the impact stress wave under oscillation jet was revealed. These provide a new method to study the mechanism of porosity and crack damage under high pressure jet.Fracture criterion by jet slotting was established and mechanism of crack development controlled by crack zone between slots was found. The fractures were induced to extend along pre-set direction,instead of being controlled by original stress field. The model of gas migration through coal seams after the hydraulic measures for grid slotting and fracking was established. The key technology and equipment for grid slotting and fracking with high-pressure oscillating jet were developed and applied to coal mines in Chongqing and Henan in China. The results show that the gas permeability of coal seam is enhanced by three orders of magnitude, efficiency of roadway excavation and mining is improved by more than 57%and the cost of gas control is reduced by 50%. | Lu Yiyu Ge Zhaolong Yang Feng Xia Binwei Tang Jiren | 2017 | International Journal of Mining Science and Technology2017，27，5： | 4 |
| 4 | Hard rock drilling technique with abrasive water jet assistance显示文摘 | Yiyu Lu Jiren Tang Zhaolong Ge Binwei Xia Yong Liu | 2012 | International Journal of Rock Mechanics and Mining Sciences2012，，： | 2 |
| 5 | Research on intelligent judgment method of natural gas hydrate drilling risk显示文摘There are many emergency risks in the process of natural gas hydrate(NGH)drilling.In order to ensure the safe and efficient exploitation of NGH,it is urgent to establish an intelligent judgment method for the risks in the process of NGH drilling.In this paper,the response relationship between monitoring parameters and risk categories of NGH while drilling is established.Based on fuzzy analytic hierarchy process(FAHP),the comprehensive weights of 10 risk monitoring parameters are obtained,including gas production,wellbore instability,hydrate ice barrier,drill string fracture,sticking,bit balling,drilling tool piercement,gas seepage,seabed subsidence and seabed landslide.Besides,the comprehensive judgment weight matrix is constructed,and the reasonable fluctuation range of monitoring parameters is formed.Thus,the intelligent judgment method of NGH drilling risk is established.The intelligent judgment and alarm of NGH drilling risks can be realized quickly and accurately by this method,namely,it can monitor the risks in the process of operation and guarantee the construction safety of NGH drilling. | Haitao Li Zhaolong Ge Na Wei Wantong Sun Yao Zhang Jin Xue Lin Jiang Jun Pei Bing Liao Hongliang Cao Ruixu Zhang Shuangli Li Qixia Lu Jinyan Luo | 2021 | Petroleum2021，7，4： | 1 |
| 6 | Formation Principle and Characteristics of Self‑Supercharging Pulsed Water Jet显示文摘High-pressure pulsed water jet technology has considerable development potential in the field of rock fragmentation.To overcome the shortcomings of existing pulsed jets,a self-supercharging pulsed water jet(SSPWJ)generation method is proposed,which is based on the theory of the pulsed water jet and the principle of hydraulic boosting.The proposed method changes the flow direction of the fluid medium through the valve core to make the piston reciprocate in the cylinder and relies on the effective area difference between the front and rear chambers in the stroke stage of the piston to realize the organic combination of“pulse”and“supercharging”of the jet,thus forming an SSPWJ.On the basis of the formation principle of the SSPWJ,a SSPWJ testing platform was constructed,and tests were performed on the jet pressure acquisition,morphology capture,and granite erosion.Both the jet pressure and the jet morphology exhibited periodic changes,and a higher pulse pressure was obtained at lower inlet pressure.The error of the pressure ratio calculated according to the experimental results was<3%relative to the theoretical design value,confirming the feasibility of the method.The pulse pressure and pulse frequency are controllable;that is,as the inlet flow rate increases in the stroke stage of the piston,the pulse pressure and pulse frequency increase,and the pulse duration decreases.As the inlet flow rate increases in the backward-stroke stage of the piston,the pulse frequency increases,and the pulse pressure and pulse duration remain unchanged.Under the combined action of the waterhammer pressure,high-speed lateral flow,and high-frequency dynamic load of the SSPWJ,local flaky exfoliation was observed when the granite surface was eroded.The results of this study lay the foundation for enriching the theory of pulsed jet generation and expanding its application range. | Zhaolong Ge Yuanfei Ling Jiren Tang Yiyu Lu Yangkai Zhang Lei Wang Qi Yao | 2022 | Chinese Journal of Mechanical Engineering2022，35，3： | 0 |
| 7 | Rapid Prediction of Structural Responses of Double-Bottom Structures in Shoal Grounding Scenario显示文摘这研究为在一种浅扎根情形预言双底部轮船的结构的回答介绍一个简化分析模型。这个答案基于为不同结构的部件从有弹性塑料的机制理论开发的一系列分析模型,包括底部 girders,地板,底部 plating,和依附的 stiffeners。我们由数字模拟验证这个简化分析模型,并且为典型油轮抓住和代表海床障碍的僵硬 indenter 建立有限元素模型。采用 LS-DYNA 有限元素解答者,我们与大量斜坡角度和缩进深度为浅扎根的盒子进行数字模拟。与数字模拟比较,我们关于全部的精力驱散和水平扎根抵抗验证建议简化分析模型。我们也调查在底部结构部件之间的变丑模式的相互作用效果。我们的结果证明分析模型预言的全部的精力驱散和电阻从数字模拟与那些同意很好。 | Zhiqiang Hu Ge Wang Qi Yao Zhaolong Yu | 2016 | Journal of Marine Science and Application2016，15，1： | 0 |
| 8 | Analysis and Numerical Simulation of Hydrofracture Crack Propagation in Coal-Rock Bed显示文摘In underground coal mines,hydrofracture can cause the increase of breathability in the fractured coal bed.When the hydrofracture crack propagates to the interface between the coal bed and the roof-floor stratum,the crack may enter roof-floor lithology,thus posing a limit on the scope of breathability increase and making it difficult to support the roof and floor board for subsequent coal mining.In this work,a two-dimensional model of coal rock bed that contains hydrofracture crack was constructed.Then an investigation that combines the fracture mechanics and the system of flow and solid in rock failure process analysis(RFPA2D-Flow)were carried out to study the failure mechanism at the interface between rocks and coals,and critical water pressure that hydrofracture crack propagates.The results indicated that the main factors that affect the direction of hydrofracture crack propagation are the angle of intersection between coal-rock interface and horizontal section,horizontal crustal stress difference,tension-shear mixed crack fracture toughness in coal-rock interface and differences in elasticity modulus of coal-rock bed.The possibility of crack directly entering coal-rock interface would increase with the increase in angle of intersection or horizontal crustal stress difference.The trend that crack propagates along the coal-rock interface will become stronger with the decrease of the fracture toughness at the coal-rock interface and the increase of the elasticity modulus difference between the coal bed and the roof strata.The results of this study was to put forward a method of controlling hydrofracture crack,optimize the fracturing well location provides a certain theoretical basis. | Yiyu Lu Chenpeng Song Yunzhong Jia Binwei Xia Zhaolong Ge Jiren Tang Qian Li | 2015 | Computer Modeling in Engineering & Sciences2015，，5： | 0 |
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