开敞式TBM同步仰拱衬砌台车的设计应用及推广前景分析

以LXB工程水源工程TBM施工段为典型案例,结合工程特点设计并使用TBM同步仰拱衬砌台车,以加快TBM运行中仰拱混凝土的施工。在已有技术的基础上进行了优化创新,台车断面采用非对称布置形式,避让连续皮带机;台车设置6个16 m长的工作区,合理布置清渣、钢筋绑扎、止水安装、模板安装、浇筑、养护等工序;充分考虑台车内双线通行以及车载混凝土搅拌罐的穿行,设计使用升降坡轨道连接装置,实现与TBM正常轨道的搭接过渡。工程实践表明,在保证不影响TBM施工的情况下,单台车月均可完成仰拱衬砌546 m,既能达到与TBM掘进同步施工的效果,又能达到缩短工期的目的。该设计在地下隧洞施工中具有广阔的推广前景。     

营尔岭隧道浅埋段连续坍塌原因分析及预防

双侧壁导坑法是现有大断面隧道施工方法中最为理想的一种方法。以某隧道浅埋段连续坍塌为例,通过MIDAS/GTS NX有限元软件对较大断面侧壁导坑上台阶开挖时出现连续坍塌事故进行了分析,并对添加临时仰拱这一措施对改善支护结构稳定性及预防坍塌发生的效果进行验证。浅埋条件下,初期支护结构未得到有效封闭连接是引起侧壁导坑上台阶开挖时出现连续坍塌的主要原因,施做临时仰拱能够有效防止坍塌的发生,这一结论对具有相似条件的工程具有借鉴意义。     

倒立摆控制系统的遗传优化方法

针对倒立摆模糊控制系统性能提高的问题,提出了一种遗传偏移调节隶属函数的方法,该方法降低了遗传搜索的维数,在较短的时间内可以获得较好的控制性能。最后仿真数据验证了该算法的有效性和可行性。     

输送带覆盖胶的阻燃配合研究

设计以天然橡胶（NR）/氯丁橡胶（CR）为阻燃输送带的主要原料配方.采用Sb2O3、ZB（硼酸锌）以及Mg（OH）2作为阻燃体系,考察Sb2O3的用量,ZB与Sb2O3的并用等对共混橡胶的阻燃性能及力学性能.实验结果表明：Sb2O3、ZB以及Mg（OH）2在共混胶料中能产生协同阻燃效应.随Sb2O3用量的增加氧指数和燃烧等级均有提高,而拉伸强度和断裂伸长率下降,随三氧化二锑用量进一步增加,阻燃效果不再增加.于是采用ZB和Mg（OH）2做进一步的协同阻燃增强,使阻燃性能有所提高,得到了综合性能达到指标MT668-1997要求的输送带覆盖胶.     

长距离钢绳芯胶带输送机设计计算

论述了长距离钢绳芯胶带输送机的小时输送能力、最大张力、带强、轴功率、动载最大张力及安全系数、电机过载、翻带区长度、四弧段半径等问题的计算或校验方法。该方法适用于各种长度、各种类型的钢绳芯胶带输送机，在晋宁磷矿的工程设计中也得到了证实。     

单级倒立摆基于LMI的H∞控制

采用拉格朗日方法对单级倒立摆系统进行了数学建模,并进行了稳定性、可控性、可观测性分析。针对单级倒立摆系统的控制问题,采用基于线性矩阵不等式（LMI）的H∞控制算法,并应用matlab对该倒立摆系统进行了仿真实验。结果表明,基于LMI的H∞控制方法考虑了被控对象中存在的各种不确定因素,抑制了扰动对输出的影响,系统的振荡小,调节时间短,响应速度快,使系统具有较强的鲁棒性和较好的动态性能,能够较好地完成倒立摆的运动控制。     

主井带式输送机电控系统的变频改造

针对某煤矿主井带式输送机的节能改造需求,提出了该输送机电控系统的变频改造方案,介绍了改造后系统结构及其采用的ACS800变频器的控制原理,分析了改造后系统在实际应用中存在的问题及相应的解决办法。     

An automated industrial conveyor belt system using image processing and hierarchical clustering for classifying marble slabs

Although there are many industrial machines used in marble industry, classification of marble slabs in terms of quality is generally performed by human experts. Due to economic losses of this rather subjective process, automatic and computerized methods are needed in order to obtain reproducible and objective results in classification. With the aim of remedying this insufficiency in marble industry, a new electro-mechanical system, which automatically classifies marble slabs while they are on a conveyor belt and groups them with the help of a control mechanism, is proposed. The developed system is composed of two parts: the software part acquires digital images of marble slabs, extracts several features using these images, and finally performs the classification using clustering methods. The hardware part is composed of a conveyor belt, a serial port communication system, pneumatic pistons, a programmable logic controller (PLC), and its control circuits, all employed together for grouping the marble slabs mechanically. Although similar studies exist, this paper proposes three novelties over the existing systems. Firstly, a new hierarchical clustering approach is introduced for quality classification without requiring a training set. Secondly, a new feature set based on morphological properties of marble surface images is proposed. Finally, an electro-mechanical system is designed for accomplishing the task of sorting out the classified marble slabs. In the literature, only a system with a labeling mechanism has been presented. Our system, on the other hand, comes with a complete conveyor belt acting as an element that links the production line with the proposed system. This allows the possibility of embedding the proposed system into the production line of a marble factory. It has been observed that although the performance of the developed system is not as high as neural network based systems that use training, it could still be employed in industry when there is no available training set of samples. With this advantage, it provides an increase in the quality control standards of marble slab classification, since marbles are classified with an objective and uniform-through-time criterion.     

南水北调工程李阳河渠道混凝土施工技术

通过工程施工的实践经验,对李阳河这种大型渠道倒洪吸的管身混凝土施工,从模板的配置与安装、钢筋制安、混凝土浇筑及养护等整个施工过程进行了总结.     

南水北调中线龙门东干渠二支管式倒虹吸下部结构优化设计

龙门东干渠二支管式倒虹吸是南水北调中线京石段应急供水工程的一座渠渠交叉建筑物,上部结构为钢管连续梁,通过对其下部支承结构拱桥方案、薄壁墩方案两种方案进行比选、论证,对其进行优化设计。