有限元法在液压支架设计中的应用

将带四连杆机构的掩护式液压支架简化成一个计算模型，从静力学和运动学两个方面，分析了该模型的受力情况，并在此基础上采用三维有限单元法，研究了ＢＹ５４０－１０．７／２７．５型支架的应力分布状况及使支架轻型化的主要途径，进而为液压支架设计提供了理论依据。     

对14号层8409综采工作面矿压显现分析

本文在总结8409工作面矿压观测的基础上，论证了英国递梯4&;#215;550号液压支架的运行及适用条件，并对支架与国岩的相互作用关系，提供了受力理论依据。     

约束边界和销轴简化对液压支架强度影响

为准确分析液压支架在顶梁扭转加载试验时的强度特性,以ZY6800/08/18D型液压支架为研究对象,采用整机建模的方式,建立了液压支架的三维实体有限元模型.根据液压支架试验的测试结果,选取仿真模型上的测点位置,分析对比顶梁和底座在8种不同的约束边界条件下,液压支架的应力分布情况,同时分析带摩擦的接触边界条件下底座和平台的接触应力分布及接触状态,指出顶梁扭转加载时的载荷不对称导致的底座不完全接触的现象.在不改变顶梁和底座约束边界的条件下,分析4种销轴连接简化方法对液压支架整体应力分布的影响.对比仿真结果与测试结果,分别评估各种边界条件和不同销轴连接简化方法的准确性,以及对仿真效率的影响.结果表明,液压支架的顶梁边界选择固定支撑,底座边界选择与工作台摩擦接触,保留销轴并将销轴与轴孔绑定接触得到的仿真结果最接近试验结果,且有较高的计算效率.研究结果可为液压支架设计过程中准确预估应力分布提供依据和参考.     

液压支架工作循环载荷模型及模拟分析

通过对液压支架动作过程的分析，建立了液压支架工作循环的载荷模型，并利用该模型对支架各动作的载荷进行了模拟分析。     

支架液压系统键图模型的建立

介绍了利用功率键图理论绘制支架液压系统各元件的方法，通过必要的假设与简化，建立了支架液压系统的键图模型，为研究系统的动态特性，分析系统的工作过程及其影响奠定了理论基础，为进一步改进和完善支架液压系统的性能提供了重要的保证。     

我国液压支架市场运行环境及趋势分析

首先回顾了我国液压支架市场运行的基本特征;其次从市场规模、竞争环境、竞争因素等方面分析了我国液压支架市场的运行环境;再次作出了2010至2015年国内液压支架的市场需求预测,并对市场未来的发展趋势进行了判断分析;最后指出了我国液压支架企业行业如何面对挑战、抓住机遇的基本思路和有效途径,从而谋求生存与发展,实现做大做强的愿景目标.     

液压支架护帮装置解析设计模型

根据液压支架护帮装置的特殊要求，提出了其设计指标，推导出了解析设计的模型，为液压支架和护帮装置的计算机辅助设计，优化设计提供了理论依据。     

用球阀设计MG400／920-WD型采煤机液压系统研究

对用电磁球阀设计电牵引采煤机液压系统进行了研究，以MG400／920-WD型采煤机为例，作了应用设计，分析了工作原理和可行性。球阀的抗污染能力强、密封性能好，适应介质沾度变化范围大、响应快、动作可靠，用其设计电牵引采煤机的液压系统，可降低泄漏，减少污染，提高液压系统的效率和工作可靠性，顺应技术发展趋势，在技术上可行。     

磁弹性应力传感器检测支架载荷试验研究

液压支架是煤矿开采中的支护设备,其载荷的检测问题一直是没有得到很好解决．根据液压支架的受载特点,提出了应用磁弹性原理检测其外载荷的方法;根据支架的结构特点,研制了适合测量支架上不同受力构件的十字桥式磁弹性应力传感器,并以此对单体液压支柱和模拟连杆试件进行了加载检测试验．结果表明,液压支柱及连杆在不同载荷下,传感器的输出信号与载荷之间具有近似线性关系的规律性．进而讨论了用磁弹性应力传感器检测支架载荷的可行性．     

喷雾降尘技术在放顶煤综采工作面的应用

根据在轩岗矿区５＾＃“三软”特厚缓斜煤层采用放顶煤综采工作面进行的综合防尘试验和分析研究结果，对采煤机内、外喷雾及放顶煤液压支架自动喷雾降尘所涉及的有关喷雾降尘的技术问题作了进一步的探讨。     

Mathematical model of electric hydraulic and powered support control system at a plough mining face

Given the actual working of a fully mechanized plough at a mining face, we have proposed a formula for running con-straints between powered supports and a coal plough under assumed geological conditions of the coal face and, on this basis, estab-lished an automatic control model of powered supports for the coal plough face. We introduced the working principle of the pow-ered support control system of the plough at the mining face. We established three advanced characteristics of this control system: response speed, reliability and easy maintenance of the system. As well, we briefly introduced, the principal function of primary and subordinate controllers and the realization of the communication system by a Single Bus. Ten controllers were constructed and tested in our laboratorium. The results show that the control model is practical and meets actual conditions. It provides a theoretical basis for designing a computer control system for a powered support system of a plough at a mining face.     

建筑产品设计过程资源管理的仿真与优化

为了提高建筑产品设计过程资源管理效率,以产品设计信息约束条件下设计活动的资源管理和优化为中心,提出基于模糊时间有色工作流网的建筑产品设计过程资源管理模型的数学表达形式,加强了资源管理模型对系统动态模糊时间约束关系的支持,解决了对建筑产品设计过程资源管理的仿真和优化的关键问题.以某办公楼结构详细设计过程为例,构建基于模糊时间有色工作流网的建筑产品设计过程资源管理模型,利用CPNTools仿真软件进行资源管理仿真分析和优化研究,验证方法的正确性和实效性.     

基于模糊逻辑的群体信任模型

从信任的主观性和模糊性角度出发,提出了一种基于模糊逻辑的群体信任模型,抽象出顺序模式、选择模式、循环模式和并行模式4种群体构成的基本约束模式及其嵌套复合来刻画群体中个体之间的约束关系,并分别给出了信任度的度量方法.群体信任模型对群体信任关系和特别软件群体的信任关系提供了很好的支持.     

基于自适应遗传算法的机泵群效率优化控制

针对城市局域排水系统机泵扬程多变、常在低效区运行所引起的污水提升高耗能问题作了探讨.依据机泵扬程和效率寻优策略,基于以避免污水外溢等为约束条件的自适应遗传算法,提出了一种综合控制方法.给出了以机泵群中主、次运行机泵效率拟合曲线为适应度的寻优运行关系图,实施扬程、效率综合寻优节能.基于泵站运行数据进行仿真,构建实验系统进行模拟实验,并依据泵站系统运行数据作不同控制方法下的扬程和提升流量跟踪比较.结果表明,在相同工况下,基于自适应遗传算法的污水系统排放流量跟随速度快,排水扬程更加稳定,机泵能够很快进入高效运行状态,综合节电效果好.     

Experimental study of a technique for load measurement of powered supports

Despite the increasing popularity of mechanized coal mining, there are no convenient and accurate means available to measure the loads of powered supports. The measurement of such loads is important for monitoring mine pressure and ensuring production safety. The load-carrying features of a powered support were used to develop a method for load measurement using the magnetoelastic principle. A cross bridge-type magnetoelastic stress sensor was designed for the support structures to measure the different parts of the supports. Tests on single-body hydraulic cylinders and simulated linkages showed that an approximately linear relationship between the values of the sensor output signal and the loads borne by the hydraulic cylinders or linkages. The results were used to analyze the load-carrying measurements of powered supports with the cross bridge-type magnetoelastic stress sensor.     

Methods for measuring and calculating the external load of powered supports

Taking the chock shield supports as the object of study, methods for measuring and calculating the external load of powered supports were discussed. Selecting the angle parameters as variables, the simple formulae of interactive computation with respect to the work angles of a powered support were deduced and verified by an example. Furthermore, the formulae determining the magnitude, direction and action point of the external load were put forward. The investigation results have provided a sound basis for the software design of the intelligent instrument for load measuring of powered supports.     

Robustly stable model predictive control based on parallel support vector machines with linear kernel

Robustly stable multi-step-ahead model predictive control (MPC) based on parallel support vector machines (SVMs) with linear kernel was proposed. First, an analytical solution of optimal control laws of parallel SVMs based MPC was derived, and then the necessary and sufficient stability condition for MPC closed loop was given according to SVM model, and finally a method of judging the discrepancy between SVM model and the actual plant was presented, and consequently the constraint sets, which can guarantee that the stability condition is still robust for model/plant mismatch within some given bounds, were obtained by applying small-gain theorem. Simulation experiments show the proposed stability condition and robust constraint sets can provide a convenient way of adjusting controller parameters to ensure a closed-loop with larger stable margin.     

Control strategy for an intelligent shearer height adjusting system

An intelligent shearer height adjusting system is a key technology for mining at a man-less working face.A control strategy for a shearer height adjusting system based on a mathematical model of the height adjusting mechanism is proposed.It considers the non-linearity and time variations in the control process and uses Dynamic Fuzzy Neural Networks(D-FNN).The inverse characteristics of the system are studied.An adaptive on-line learning and error compensation mechanism guarantees system real-time performance and reliability.Parameters from a German Eickhoff SL500 shearer were used with Matlab/Simulink to simulate a height adjusting control system.Simulation shows that the trace error of a D-FNN controller is smaller than that of a PID controller.Also,the D-FNN control scheme has good generalization and tracking performance,which allow it to satisfy the needs of a shearer height adjusting system.     

机构运动的变换式进化设计

现有的基于几何约束关系的CAD系统不能很好地解决面向方案设计的机构运动模型表示这一问题，为此提出了一种新的基于功能语义的运动进化建模方法.以功能单元的定义实现机械产品功能运动约束的抽象表达，研究了在机械产品运动进化建模过程中功能语义的表达、功能运动约束的进化模式以及机构运动综合技术.建立了功能运动约束与机构组合约束间的进化关系，实现了由语义层向几何约束层传递运动意图.将功能语义与运动功能综合求解的变换式进化过程相结合，实现了对设计者功能意图的映射转化.结合企业具体应用将上述理论应用于实际产品开发中，取得了良好的效果     

关系数据库转换为XML文档的新方法

提出一种在保存数据约束条件下,把关系数据库信息转换为XML文档,并在得到的XML文档信息中能完整地体现所保存的数据约束的新方法。解决了只注意数据结构的无损转换,而忽略数据约束的保存问题。具体做法是:为使关系模式与XML模式相互兼容,把关系数据库中存在数据联系的关系合并成一个新关系;把每个新关系按其数据的约束条件转换为XML文档树后,将多个XML合并成一棵XML文档树;在此树上可根据实际需求选择整个(部分)XML文档树转换为XML文档。