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Forming mechanism of ultrasonic vibration assisted compression 被引量:4
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作者 庄新村 王家鹏 +1 位作者 郑欢 赵震 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第7期2352-2360,共9页
To study the mechanism of ultrasonic vibration assisted forming,the static and vibration assisted compression tests of aluminum 1050 were carried out via a 25 kHz high-frequency ultrasonic vibration device.It is found... To study the mechanism of ultrasonic vibration assisted forming,the static and vibration assisted compression tests of aluminum 1050 were carried out via a 25 kHz high-frequency ultrasonic vibration device.It is found that vibration reduces the flow resistance and improves the surface topography.The force reduction level is proportional to the ultrasonic vibration amplitude.By using numerical simulation of static and vibration assisted compression tests,the deformation characteristics of material were investigated.Throughout the vibration,the friction between the materials and tools reduces.The stress superposition and friction effects are found to be two major reasons for reducing the force.However,the force reduction because of stress superposition and friction effects is still less than the actual force reduction from the tests,which suggests that softening effect may be one of the other reasons to reduce the force. 展开更多
关键词 ultrasonic vibration compression stress superposition friction effect
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软岩矿井煤柱留设与支护探讨 被引量:1
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作者 买文虎 《内蒙古煤炭经济》 2019年第2期132-132,134,共2页
榆树井煤矿沿空巷道受工作面动压叠加影响,巷道变形严重且支护困难。为解决工作面动压叠加影响严重问题,对煤柱留设宽度进行优化。在榆树井煤矿13803工作面上顺煤柱侧与非煤柱侧安装钻孔应力计,对不同区段、不同宽度煤柱和区段非煤柱应... 榆树井煤矿沿空巷道受工作面动压叠加影响,巷道变形严重且支护困难。为解决工作面动压叠加影响严重问题,对煤柱留设宽度进行优化。在榆树井煤矿13803工作面上顺煤柱侧与非煤柱侧安装钻孔应力计,对不同区段、不同宽度煤柱和区段非煤柱应力现场监测表明,0~20m煤柱区有应力峰值区和塑性区,0~30m无煤柱区也有应力峰值区和塑性区。通过应力分析得出,较小煤柱难以抵抗工作面动压叠加影响,需加密加长超前单体支护。同时分析得出,软岩矿井难以进行沿空留巷。 展开更多
关键词 软岩矿井 动压叠加 煤柱宽度 沿空留巷 沿空支护
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近距离薄煤层回釆技术的应用
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作者 张维国 《铁法科技》 2018年第A01期1-2,7,共3页
大隆矿二水平南一采区1301工作面位于12层煤的采空区之下,鉴于顶板松软破碎,易发生冒顶、漏顶问题,以矿压理论为指导,把回采巷道布置在采动减压区,减少上覆动压与本层动压叠加,釆用锚杆锚索支护技术措施,加快回采期间工作面推进速度,缩... 大隆矿二水平南一采区1301工作面位于12层煤的采空区之下,鉴于顶板松软破碎,易发生冒顶、漏顶问题,以矿压理论为指导,把回采巷道布置在采动减压区,减少上覆动压与本层动压叠加,釆用锚杆锚索支护技术措施,加快回采期间工作面推进速度,缩短空顶时间,加强顶板管理,实现了安全回采和提质增效的目标。 展开更多
关键词 近距离 薄煤层 开采技术 动压叠加 巷道布置
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软岩矿井采空区充填、沿空留巷技术探讨与研究
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作者 买文虎 刘统申 《中文科技期刊数据库(全文版)工程技术》 2019年第4期230-230,232,共2页
榆树井煤矿沿空巷道受工作面动压叠加影响,沿空巷道底鼓变形严重。通过沿空巷道煤柱侧、非煤柱侧钻孔应力监测数据分析,软岩矿井0-30m煤柱均不能有效抵抗工作面动压叠加影响。通过采空区动压机理分析,软岩矿井采空区充填+沿空留巷有望... 榆树井煤矿沿空巷道受工作面动压叠加影响,沿空巷道底鼓变形严重。通过沿空巷道煤柱侧、非煤柱侧钻孔应力监测数据分析,软岩矿井0-30m煤柱均不能有效抵抗工作面动压叠加影响。通过采空区动压机理分析,软岩矿井采空区充填+沿空留巷有望实现沿空留巷。 展开更多
关键词 软岩矿井 动压叠加 采空区充填 沿空留巷
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Realization of superposition and entanglement of coherent and squeezed states in circuit quantum electrodynamics 被引量:1
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作者 CHEN ChangYong SUN Qing 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2011年第5期930-935,共6页
We propose a new scheme for generating the superposition and entanglement of the coherent states and squeezed states by consid- ering N superconducting charge qubits (or artificial two-level atoms) interacting with ... We propose a new scheme for generating the superposition and entanglement of the coherent states and squeezed states by consid- ering N superconducting charge qubits (or artificial two-level atoms) interacting with photons in a high finesse cavity on a chip, assisted by a strong driving field. By virtue of the parameters of this system, we can generate novel quantum states, for example, multiparty entangled states and Schr6dinger cat states among the superconducting qubits, coherent states and squeezed states of the cavity. These states, whose amplitudes are about two orders greater than those from the atomic quantum electrodynamics in classical cavity, are important for understanding the boundary between quantum and classical behavior and can be utilized in experimental studies on decoherence. This device may be an architecture for future solid-state quantum computation and communication. 展开更多
关键词 multiparty entangmement circuit QED photon interaction
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Flow Development through HP&LP Turbines,PartⅠ:Inward Rotating Cavity Flow with Superimposed Throughflow
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作者 GAO Jinhai DU Qiang +4 位作者 LIU Jun LIU Guang WANG Pei LIU Hongrui DU Meimei 《Journal of Thermal Science》 SCIE EI CAS CSCD 2017年第4期297-307,共11页
With the aid of numerical method, both flow field and its accompanied loss mechanism within the rotating cavity are investigated in detail in the 1^(st) part of the two parts paper. For ease of comparison, rotating ca... With the aid of numerical method, both flow field and its accompanied loss mechanism within the rotating cavity are investigated in detail in the 1^(st) part of the two parts paper. For ease of comparison, rotating cavity is further classified as the rotor-stator cavity case and the rotor-rotor cavity case. Results indicate that flow within both kinds of the cavity act as the inviscid flow except that the flow near walls, neighboring the lower G region and in the vicinity of the rotating orifices. In the regions except such inviscid-flow-dominate domains, the theoretical core rotation factor can be safely used to predict the swirl ratio within the cavity. When detailed flow pattern is considered, Ekman-type flow exists near periphery of the surface's boundary layer where viscous effect is non-negligible. However, due to the complex profile of the simulated cavity case, vortices structure is varied within the cavity. By comparison, swirl ratio can be used to predict the magnitude of loss. Due to the relatively evident rotating effects of the rotor-rotor cavity, swirl ratio even increases to 1.4 in the current model, which means that flow is moving faster than the surrounding disc. Further investigation finds that this kind of highly rotating flow is accompanied with serious undesirable pressure loss. Parenthetically, unlike its counterpart, swirl ratio above 1.0 doesn't happen when fluid passes through the rotor-stator cavity. So it is suggested that rotor-rotor flow cavity with the superimposed inward throughflow should be avoided in the engine design or certain measurements should be provided when such structure design is unavoidable. Simulation done in the current paper is meaningful since these dimensional parameters are typical in the design of state-of-art. Relatively lower range of Re_φ and C_w is not considered in the current two parts paper. 展开更多
关键词 Turbines Inward rotating cavity flow Superimposed throughflow Flow pattern
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