采煤机自适应记忆切割

针对以往的采煤机记忆切割技术在我国复杂地质条件下不适用的情况,提出了基于模糊控制理论的采煤机自适应记忆切割技术,设计出了采煤机位置、姿态定位系统和采煤机自适应切割模糊控制系统.该系统可以获取采煤机任意位置处的姿态和状态信息,自动跟踪所记忆的切割路径,基于模糊控制理论对是否截割到岩石进行判断并做出最优的处理方案.通过实验室的路径跟踪实验和西安煤矿机械有限公司的自适应调节实验证明:该技术在实现采煤机记忆切割的基础上能够识别出滚筒到切割岩石时的异常状态,并对牵引速度和滚筒高度做自适应调节,能够满足复杂地质条件下对采煤机的控制要求.     

采煤机沿铅垂方向振动的模拟与分析

对采煤机沿铅垂方向的振动进行了模拟分析,并讨论了各部质量、刚度和阻尼对采煤机振动的影响,为改进采煤机的设计、减轻采煤机的振动和改善机器的动态特性奠定了基础。     

基于知识的采煤机螺旋滚筒专家系统设计

为解决采煤机螺旋滚筒设计以手工分析、计算为主,设计效率低、设计质量因设计者而异的问题,通过对专家系统关键技术的分析与研究,借鉴专家的经验和设计实例,以VB6.0为编写平台,采用模块化思想,自下而上地建立了采煤机螺旋滚筒专家系统。利用该系统能快速地对螺旋滚筒结构进行设计与仿真,快速而稳定地实现了采煤机螺旋滚筒设计,保证了采煤机滚筒的设计质量和提高了设计效率,为设计高质量的采煤机奠定了基础。     

可视化模拟在连续采煤机滚筒设计上应用

为了准确研究连续采煤机工作时工作机构上的载荷情况,以破煤理论为基础,通过对影响截齿载荷的各项因素进行理论分析,建立了滚筒受力的数学模型.根据模型,基于VB6.0平台设计了连续采煤机滚筒的计算机辅助设计系统.利用该系统在可视化界面中输入不同的参数,可以输出不同工况下的滚筒载荷.该可视化模拟软件为连续采煤机的滚筒设计提供了简捷、有效的设计手段.     

一种采用灰色马尔科夫组合模型的采煤机记忆截割算法

针对传统采煤机记忆截割策略需要频繁人工调整摇臂高度导致效率和精度低等不足,提出利用灰色马尔科夫组合模型的采煤机自适应记忆截割策略。当采煤机截割岩石时,首先根据截割高度先验数据,利用灰色模型得到截割高度预测数据,在此基础上,对该预测数据进行残差计算和状态划分,确定马尔科夫链状态概率矩阵。通过马尔科夫链状态概率矩阵对灰色模型进行反馈修正,得到采煤机截割高度自适应调整值。通过模拟采煤机工作面调整高度,对2种采煤机记忆截割策略进行仿真分析。研究结果表明:传统记忆截割模型可信度为96.26%,但需要5次人工调整,而灰色马尔科夫记忆截割模型的可信度在无人干预下高达99.20%;基于灰色马尔科夫组合模型的采煤机记忆截割策略不仅具有更高的控制精度,而且大大提高了采煤机的自动化水平。     

采煤机滚筒计算机辅助设计系统

以截割理论为基础,通过对影响采煤机滚筒性能各因素的考虑,建立了采煤机滚筒的计算机辅助设计方法,介绍了采煤机滚筒计算机辅助系统设计软件及其内容、特点和工作过程;利用该软件可以设计新滚筒,也可以对已使用的滚筒进行改造设计,所设计的滚筒可以改善采煤机的截割性能,提高截割效率,增加机器的稳定性.图4,参5.     

基于Zigbee技术的采煤机的监控系统

采煤机在井下工作时,采用有线方式监测其运行状态和相关参数时存在传输距离远和布线难的问题。采煤机的相关状态和参数为采煤机的记忆截割路径算法提供最可靠的信息源,为其准确的截割和提高回采率提供了可靠的保证。基于以上考虑,本文设计基于Zigbee技术的无线监控系统。首先是布置在井下的无线传感器的采集节点对采煤机的相关信息进行采集,然后相关的传输节点将信息传至上位机,同时可进行监控信息的查询和反馈,有助于进一步的提高综采的信息化。     

采煤机参数与工作面噪声关系的数学模型

为减少采煤工作面噪声的危害,分析了采煤机噪声的构成,通过假设与简化,建立了采煤机参数与工作面噪声之间关系的数学模型,并编制计算机程序和利用所建模型对采煤机工作面的噪声进行模拟研究.研究表明,工作面噪声随滚筒直径与转速、截割阻抗及牵引速度等参数的增加而增大,随截线间距、切屑厚度、煤岩脆性程度的增大而减小.该模型对于评价机器工作性能、改进机器设计等具有重要理论意义.     

电牵引采煤机远程控调技术研究

煤矿开采中采煤机作为关键设备,实现采煤机的远程自动割煤一直是煤矿自动化控制的追求目标,本文结合目前煤矿开采的实际情况,通过对采煤机的数据通信、采煤机的姿态监测、位置识别、调高控制、记忆截割、故障诊断与报警等环节,阐述采煤机远程控制的实现方法与控制技术.     

MG-300采煤机不同截深滚筒载荷计算机模拟

为了分析采煤机滚筒瞬时载荷的波动情况,通过建立采煤机单个截齿受力和滚筒载荷数学模型的方法,并利用计算机模拟技术,对采煤机不同截深下的截割过程进行模拟.获得了滚筒在不同截深工况的载荷和波动系数变化特征.针对MG-300型采煤机的某种滚筒进行模拟分析,得出了实际应用中降低滚筒载荷波动系数的措施,并且为采煤机的动态设计及优化设计提供了必要的手段.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that