摘要：It is important to calibrate micro-parameters for applying partied flow code(PFC)to study mechanical characteristics and failure mechanism of rock *** design method is firstly adopted to determine the microscopic parameters of parallel-bonded particle model for three-dimensional discrete element particle flow code(PFC3D).Variation ranges of microscopic of the microscopic parameters are created by analyzing the effects of microscopic parameters on macroscopic parameters(elastic modulus E,Poisson ratio v,uniaxial compressive strengthσc,and ratio of crack initial stress to uniaxial compressive strengthσci/σc)in order to obtain the actual uniform design *** calculation equations of the microscopic and macroscopic parameters of rock materials can be established by the actual uniform design table and the regression analysis and thus the PFC3D microscopic parameters can be quantitatively *** PFC3D simulated results of the intact and pre-cracked rock specimens under uniaxial and triaxial compressions(including the macroscopic mechanical parameters,stress−strain curves and failure process)are in good agreement with experimental results,which can prove the validity of the calculation equations of microscopic and macroscopic parameters.

摘要：The adhesion between the mining machine and the deep-sea sediments will significantly affect the driving performance of the mining machine in the deep-sea *** the mining machine and the deep-sea sediment interaction simulation was carried out,the accuracy of the particle interaction parameters will directly affect the simulation *** study proposed a method to systematically calibrate the interaction parameters between deep-sea sediment and grouser through the combination of experiment and *** uniaxial compression test and macro adhesion test and corresponding discrete element numerical simulation were carried out,modifying the contact parameters until the simulation results are close to the experimental *** the micro-parameters of the JKR adhesion contact model were back calibrated with the test results,and the contact parameters between soil particle-soil particle and soil particle-metal are ***,the adhesion test shows that the adhesion forces were ranked in the order of 5052<STi80<TA2<TC4 under the same surface roughness,which indicates the aluminum alloy 5052 has the best anti-adhesion *** relationship between surface adhesion force and microscopic contact parameters was studied by discrete element numerical simulation,and the result shows that the coefficient of static friction and the coefficient of rolling friction has little effect on adhesion *** it is mainly affected by the coefficient of restitution and surface energy,the surface adhesion force tends to decrease with the increase of the coefficient of restitution and increase with the growth of surface *** obtained parameters of soil particle to soil particle and soil particle to metal affecting the adhesion can contribute to the design optimization for the grouser of mining machines to decrease surface adhesion and enhance its movability and mining efficiency.

摘要：深海海域蕴藏的丰富矿产资源被认为是21世纪陆地矿最重要的替代资源,加大深海矿产资源开发与利用力度,已成为全球经济可持续发展的重要抉择,是我国建设海洋强国的重大战略需求。采矿车在深海稀软底质上的行走性能对深海矿产资源开采的安全稳定性具有重要影响。本文回顾了深海采矿方法及采矿车的发展历程,总结了深海稀软底质基本物理力学特性特别是流变特性及其本构关系,分析了采矿车行走运动特性及其牵引力的研究现状以及存在的主要问题,探讨了深海采矿车行走性能及结构优化设计的未来研究方向,为构建环境友好的深海采矿作业系统提供理论依据。

摘要：基于工业控制计算机、单片微处理器等硬件和OpenGL、VC++等软件,针对典型的五自由度多关节工业机器人构建出了一个虚拟现实和物理模型相结合的开放式通用仿真综合试验系统,给出了机器人三级控制系统体系结构和内部通信协议,建立了机器人运动学坐标系,推导出了相应的末端作用器位姿转换矩阵,可以完成机器人学中正向运动学、逆向运动学、路径规划以及动力学等方面的研究与设计。最后,将其成功应用于《工业机器人学》课程教学和智能型采棉机器人的研发过程中,发挥了重要的指导作用。

摘要：针对取样于太平洋C-C矿区的深海稀软底质土,采用激光粒度分析、液塑限联合测定、氮吸附、固结和直剪等方法对其开展物理和力学性能研究,并通过X射线衍射法和电镜法分析其矿物组成成分和微观结构。研究结果表明:深海稀软底质土为以粉粒为主的黏质土,具有高液限、高塑性,高比表面积、高固结系数、低压缩模量、低抗剪强度等特性,极易造成集矿机的沉陷和打滑。该土样的矿物成分主要由蒙脱石、石英、长石、云母、绿泥石和蛇纹石组成,显微结构为以粉粒和微生物碎片为主的片状链接结构和以黏土矿物为主的蜂窝状絮凝结构相互填充而成。深海稀软底质模拟土的配置原则应以矿物成分、粒径、含水率、比表面积和剪切强度为主,且综合考虑液限、塑限和显微结构。研究结果将为深海集矿机行走特性研究及其优化设计提供重要依据。

摘要：对包装生产线的分布式监控诊断系统的通信系统进行了具体的设计:其中上位机IPC上,用VB6.0开发了通信管理程序,实现了IPC与PLC、单片机之间通信连接;下位机PLC与单片机之间也建立了通信连接功能。在实际应用中,较好达到设计要求,使得设计具有较大的推广价值和有一定的实效性。

摘要：采用有限元方法分析硬质合金TiCN梯度涂层的热应力缓和机制,比较了单层TiC、TiN涂层和TiC/TiCN/TiN梯度复合涂层对热应力场的影响。计算表明:单层的TiN涂层表面应力最大,为1728MPa;单层的TiC涂层应力最小,为1067MPa;在TiN和TiC之间增加TiCN过渡层时,应力减小为1 674 MPa;只有TiC/TiCN时,应力减小幅度最大,只有1352MPa。TiCN层内应力梯度非常明显,其中等效应力最大值出现在边角上,为3148MPa。因此,热裂纹应从刀片边缘开始,与实验结果吻合较好。

摘要：地下多层洞室是压气储能(CAES)工程的关键环节,其优化设计对提高压气储能工程的效率至关重要,而大多数压气储能工程的洞室优化模型只考虑强度指标,未考虑经济性指标。本文采用有限元方法模拟了高温高压作用下的CAES多层洞室,计算了各层的应力场和应变场(通过试验验证了εθ_(max)出现在衬砌层的顶部),并论证了衬砌层εθ_(max)受结构参数的影响较小,以及预应力衬砌的必要性。预应力衬砌洞室的数值计算结果表明,施加预应力可以有效地减小εθ_(max),提高CAES预应力衬砌洞室的稳定性。建立了一种新的CAES预应力内衬洞室的多目标优化模型,该模型考虑了安全性(最小化预应力以满足其强度条件)和经济性(最小化洞室表面积以降低施工成本)。计算结果表明,多目标优化模型比单目标优化模型(仅考虑强度指标)更安全、更经济地获得CAES多层洞室结构。

摘要：在分析复合土钉支护侧土压力分布模式及相关国内外著名实测结果的基础上,考虑基坑底面受开挖影响的深度,提出一种新型的侧土压分布改进模式,即“五边形”模型,并将此模型应用于某水泥搅拌桩复合土钉支护工程中。计算结果表明,所提出的“五边形”侧土压力分布模式与实测结果相符合,与现有的侧土压力分布模式相比更加合理,对复合土钉支护结构的整体设计、稳定性分析、工程造价预算等具有指导意义和应用价值。

摘要：POSS是多面体低聚倍半硅氧烷的简称,是一种有机-无机杂化结构的分子,其内部为Si-O-Si键组成的无机框架,外部被有机基团所包围,分子结构可控可设计,应用十分广泛。本文综述了最近几年国内外POSS的研究进展,尤其是官能化POSS的合成及其在环氧树脂改性中的应用情况,并对其发展趋势作了展望。