共查询到20条相似文献，搜索用时 15 毫秒
1.
Based on the complex geological environment and hydro-geological conditions in mountainous areas the fuzzy comprehensive evaluation index system of the mine geological environment is constructed. It uses the weak fuzzy consistent matrix and analytic hierarchy process to calculate the weight, which solves the question that traditional AHP is difficult to meet the consistency test. According to the special geological conditions of the mine, it divides the impact of the geological environment into three levels, builts the fuzzy comprehensive evaluation table and determines the membership degree of the influencing factors. Combined with fuzzy comprehensive evaluation method, it developes a second-order fuzzy comprehensive evaluation model of the impact of the mine geological environment. By means of the application of this model to the actual mining, it shows that the evaluation results of the model are highly similar to the actual results of the impacts of landslides, land subsidence and other geological disasters. 相似文献
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The main effort is to develop numerical simulation software of low pressure die casting on Windows platform in Personal Computer, based on the production of aluminum wheel in Die cast wheel manufacture Co. Ltd.. The heat conduction calculation is the basis of solidification simulation. A 3 dimentional model including the refrigeration medium block is set up based on the study of boundary heat exchange. Various calculation method is analyzed for different types of boundary element. A comprehensive calculation model is set up according to practically manipulable parameters in production. 相似文献
3.
The high-dipping, multi-seam coal, short distance, much damage and complex mine,the major unit of minins is working areas. The optimization of mine-out areas' parameter is complex,that is seldom studied in the world,it includes coal-mining method, the choice of working areas' cquipments of machine-electricity,layoat of roadways in working areas and the choice of parameter. Through the amprehensive andlysis,erecting all kinds of costs which are divided into the economic mathematical model of the least costs per ton-of-coal,using 18 standards of synthesis and the result of calculating by computer,this thesis chooses the complex high-dipping mine-out areas'parameter which is optimized. It is based on the example of Zhong Liang Shan mine. 相似文献
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The depth of coal mining in Yanshitai mine is over 600 m,dynamics phenomena have been occurred of ter during mining ahd excavating.On the basis of research in Yanshitai mine,this paper recorded the geology and mechanics model of typical dynamics phenomena based on the mining and geology conditions,which have been applied for the mechanism of dynamics phenomena and studied with catastrophe.Meanwhile,the features and influence factor have been studied,and they can be references for mine hazards. 相似文献
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CHEN Xing-ming LIU Fei WANG Ping NIE Neng HU Xiang-dong CHEN Yong FENG Hui-zong 《保鲜与加工》2000,(2):120-122
The Postal Transportation Problem(PTP)is a very complex transportation problem. It has not any very effective solving method at present. This paper systemically analyze and define the problem according to its range, capability and time limit restrictions, random factors, dynamic factors, preferential factors, optimization objectives, cost composing, and so on. The multiobjective optimization mathematical modelof PTP is established and its relational problems are also analyzed. And the model is made up of 12 kinds of restraint conditions and three optimization objectives which are the whole transportation cost, average transportation time of mail and average use ratio of cars. This will be in favor of further study of PTP. The successful development of a logistics scheduling and dispatching optimization software based on the model and its corresponding algorithm proves the correctness of the model.[WT5HZ] 相似文献
6.
ZENG Xue hong FAN You ping HAN Rong jun HUANG Xi yue TANG Xian ming MAO Wan biao 《保鲜与加工》2002,(12):49-54
In point of view of the system, the characteristic of leak current fault diagnosis in launch vehicle controlling system is analyzed. It is presented that the fault is a connecting way for sytem factors. By building some basic concepts such as componts, syptoms, observation and faults, the system model is turned into graph, where nodes represent components and edges represent fault transmission among components. Besides,designing rule, that is, bisection rule for diagnosing alglorithm is given based on the information theory. Operating feasibility and entropy function characteristic are analyzed using component trade-off value to substitute component entropy, giving fault problem-solving way based on the drawing model. 相似文献
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Fisher discriminant analysis model for selecting the retaining structure type of deep foundation pit 总被引：2，自引：0，他引：2
Aiming at the problem of traditional evaluation methods of deep foundation pit for selecting the retaining structure type, based on the statistical theory and following the principle of security, economic and reasonable, a Fisher discriminant analysis(FDA) model for selecting the retaining structure type for deep foundation pit is established. 10 selected indicators which influence selection of deep excavation program are taken into account as discriminant factors, and the supporting schemes for deep foundation pit are classified into 5 groups, viz. gravity of the cement-soil type, soil nailing wall, pile anchors, pile supports and underground continuous wall. After training and testing 64 sets of measured data, the discriminant functions of FDA are solved, the re-substitution method is introduced to verify the stability of FDA model and the ratio of mis-discrimination is 14.1%. Another 10 groups of measured data are tested as forecast samples by the proposed model, and the correct rate is equal to 100%. Therefore, the feasibility of the proposed model is validated. Moreover, the proposed model is adopted for the New World Center Project in China, and the prediction results are in line with the artificial neural network(ANN) and the actual situation. The result shows that the deep foundation pit supporting structure lectotype decision of FDA model has excellent discriminant performance and the resubstitution error rate is low. It is easy and efficient to make discriminant analysis using this model and it provides efficient method to select deep excavation retaining structure and a practical new approach to choose the structural type of deep foundation pit optimization. 相似文献
9.
LUO Xiao gang HUANG Qian PEN Cheng lin LIU Ting YIN Peng WEN Li GAO Yun hua 《保鲜与加工》2009,(1):116-120
Due to weak edges and low contrast areas in digital images, such as a left ventricle in Magnetic Resonance Imaging (MRI) images, a deformation curve may leak from the outer boundary when images are segmented using the traditional snake model. An improved algorithm based on the water balloons snake model is introduced to solve this problem. Firstly, the barycenter and the boundary shape area of the left ventricle in a digital MRI image are obtained through mathematical morphology. The left ventricular watershed line is obtained next using a watershed transform algorithm, which is taken as the initial deformation curve in a balloon snake model to capture the contour. Different snake models are tested to digitally tagged MRI images of left ventricles of small pigs. Contrast results indicate that the water balloons snake model can solve the leakage problem in traditional snake and balloon snake models. In addition, the processing speed is improved significantly. 相似文献
10.
采用在线监测系统监测进行随钻参数的采样与分析,建立了派生参数与直测参数的理论表达式,提出了多因素组合的地层比功模型,实现了地层地质条件与随钻参数的有机结合。以重庆市某高压变电站施工场地为依托,建立了不同地层如素填土层、粉质粘土层、砂岩层及泥岩层的地层比功演化曲线,对比地勘信息可知,不同地层的比功值存在显著差异。可见,合理的地层比功阈值是辨识地层类型的重要参量。运用统计学原理对勘测孔附近不同地层的比功值阈值进行保值优化,通过地勘获得的地层信息来验证阈值区间的可靠性。进一步采用如上地层比功阈值对该区域的其他桩位所在地层进行分析验证,说明了地层比功阈值优化的统计方法可行,其阈值区间合理,可用于其他赋存环境的地层比功阈值确定及地层识别。 相似文献
11.
In this article, modal analysis technology about dynamic analysis was studied. Free interface model comprehensive method was used to dynamic analysis and design of automobile structure based on theory background of model analysis, test technology conditions, data reliability and precision. In order to test the efficient and possibility of the method, main vibration features about space double layer has been calculated based on this method, comparing this with the precise solution of finite element method, the result shows that this method is suitable not only for simple interfaces between components but also for high reductive interfaces. In addition, the method also has high comprehensive precision. Furthermore it creates conditions to dynamic analysis in automobile structures. 相似文献
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为了实现从整体和局部都能较为准确地分析弧状高陡边坡安全稳定性,指导露天采矿高陡边坡设计,采用有限差分强度折减法分析边坡稳定性,获得边坡整体的安全系数。对每个计算单元引入安全度进行分析,获得边坡局部安全系数;将最大节点位移时步曲线收敛性作为边坡失稳的判定准则,弥补了采用其他准则时由于人为指定容差而引起的较大误差;以某铁矿西南边坡为例,运用FISH语言编制强度折减法、失稳准则和安全度相关程序进行计算。研究表明：有限差分强度折减法、基于最大节点位移时步曲线收敛性的失稳准则和计算单元安全度相结合的边坡稳定性分析方法适合于弧状边坡稳定性分析,研究为弧状高陡边坡设计提出了新的思路。 相似文献
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为了确定经济合理的露天矿备采煤量留设位置和保有期,运用露天开采基本原理与统计分析方法,分析新时期露天煤矿的发展变化特点及其对备采煤量留设位置和保有期的影响;以经济效益最优为判断准则,研究复合煤层露天矿备采煤量留设位置与内排运距的关系,建立备采煤量留设位置优化模型;研究季节性剥离露天矿备采煤量保有期与剥离成本、运输成本以及资金时间价值的关系,建立备采煤量保有期优化模型。以内蒙古东部地区某露天矿为研究实例,确定了该矿经济合理的备采煤量保有期为6.5个月,备采煤量应全部留在1号煤层。研究结果表明：该优化模型可用于指导露天矿生产,有效降低剥离成本,提高经济效益。 相似文献
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Numerical models based on FLAC 3D are difficult to build. A new kind of method modeling and meshing in the CATIA software, named the CATIA-FLAC 3D coupled modeling method, was proposed. This method utilizes the powerful geological modeling capabilities of CATIA for three-dimensional geological body modeling and meshing. And then, the interface program of CATIA-FLAC 3D is adopted to export the information into FLAC 3D, which is coded by visual basic language based on the variance of nodes and elements between the two software. The new proposed method was used in a bias tunnel through a mountain, and the results verified the feasibility and effectiveness of the proposed method. 相似文献
16.
A connecting platform between the field model and network model has been constructed, based on a multi functional building model. The field model is used to simulate the fire smoke in certain special compartments (the fire room and specific large space rooms), while the network model is used to simulate the uniform compartments. When combining the simulation results of the field model and network model as the interface boundary conditions for the each other, a hybrid field and network model is presented. The hybrid field network model can provide more detailed physical information of the fire smoke properties under a specific fire scenario for the specially confined compartments. In addition, the hybrid model can predict the fire smoke flow properties in the building accurately. 相似文献
17.
Geological conditions of Jinping I Hydropower diversion tunnel is very complicated, it has the following characteristics, such as high geostress and developmental faults and joints, several collapse occurred in the construction process. A brief introduction is given to the geological conditions of Jinping I Hydropower diversion tunnel, based on discrete element method, Major joints and faults were simulated, and calculation models were built. By calculation and analysis, Rules and characteristics of deformation and failure for rock diversion tunnel has been obtained. After the diversion tunnel was excavated, high geostress were released, structural surface relaxation and slip. Side wall generated vertical cracks, vault take place chipping. With deformation increasing, the structural plane was further slip and open, dome support weakened, leading to collapse. 相似文献
18.
民族地区的农村居民点因受国家政策及人类活动的影响而亟待转型,探索此区域农村居民点的布局优化模式有利于推进该区域国土空间治理和全面实现乡村振兴。以民族地区典型代表区贵州省黎平县为研究区,采用AHP法、GIS空间分析法、复杂网络、Python语言编程等方法集成分析研究区农村居民点的优化布局模式。结果表明：（1）研究区农村居民点综合影响力在22.30~76.09之间,中高等水平的农村居民点居多,农村居民点综合影响大小分布不均。（2）以农村居民点综合影响力为切入点构建农村居民点复杂网络,网络的联系性、集中性强但中心性一般。在空间上,网络节点分布不均且差异明显,中心性强的节点集聚分布。将复杂网络的5个指标加权求和后,依据分析结果将黎平县农村居民点优化布局模式归纳为集聚发展型、重点发展型、潜力优化型、规模控制型、迁村撤并型。 相似文献
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In this paper,a numerical model of a three dimensional human torso has been presented.In this model,the torso part including anisotropic muscle layers has been discretized by means of the finite element method(FEM).The rest of torso have been divided into the surface elements by the boundary element method(BEM).This discretized model can be used in the field such as the forward problem and the inverse problem of the electrocardiogram(ECG). 相似文献
20.
Chao Denju JuangTao XuiKai 《保鲜与加工》1992,(6):65-69
The precise solution of mathematical model for two-step carburigation has been induced which is under the condition of the third boundary. This solution has been compared with the finite difference technique and its correctness and practicality have been proved. 相似文献