When an engine works under the vacuum condition . so existing experimental products can be proof - tested by it and all test results obtained will be used for reference for the aero craft . accordingly , the technology studied in the thesis is quite significative to improve the efficiency of the engines of space propulsion system , economize limited resources on the spacecrafts , and prolong their lives 其目的是建立一个能满足小推力液体火箭发动机动态推力测试的系统,以便能够根据空间推进系统对发动机越来越高的工作性能要求,真实有效地反映发动机在真空环境下的工作状态等,对已经设计和生产出的发动机在高空模拟条件下进行实际测试,从而提供发动机的动态性能指标,为发动机的定型提供试验数据和依据。
The research paper is based on the the latest softwares of the managing inventory , its research subject is about simulating the most appropriate inventory quantity and ordering quantity by statisticing the probability of the random require quantity . its purpose is to provide the relied basement for determining the most appropriate inventory quantity and ordering quantity , the deterring policy quality will be raised , so the damage caused by unfit inventory quantity and the benefit of the entrerpreneur will be raised . the research method is by building the inventory management information system , the system includes automated management of parts entering and going out the datasbase . requesting the records of parts entering and going out the datasbase and displaying the sygonal when the inventory quantity is short out . computer calculating the fix period remaining , requesting remaining at any time and displaying if goods need ordering , all the partsof certain a product going out of basement and at the same time checking if the storaging quantity is enough . then simulating the most appropriate inventory quantity and ordering quantity simulating method is as follows : statisticing the random required quantity . calculating the probability , standing for the values with data range producing random data by function accordingly calculating the random required quantity . thenext step is simulating all the projects after pressing in the simulating conditions . finally selecting the best 本文通过分析国内外关于库存管理软件的发展情况,提出在线统计货物出库情况的基础上利用模拟方法确定最优存储方案,其目的是为制定合理的货物安全库存量和订货量提供可靠的依据,提高企业管理人员的决策质量,从而减小资金的占用和缺货损失,提高企业的经济效益。通过研制库存管理信息系统使库存信息管理自动化,也就是实现货物入出库管理计算机管理、自动查询货物入出库情况并在缺货时给予提示、使用计算机货物余额定期结算、货物余额实时查询并显示是否需要订货、装配出库管理使得只要输入需要装配产品代号和数量,组成它的所有零件就会自动检库和出库。然后对安全库存量和订货量进行模拟,模拟方法是首先自动统计货物在过去某一段时间内的需求量,计算出概率,用随机数的范围表示其概率数值的大小,利用随机函数产生随机数、从而间接的产生随机需求量,给定模拟天数和其他模拟条件模拟各种方案,从众多的存储方案中找出最优存储方案。
The particles aggregation was simulated using particle - cluster and cluster - cluster aggregation model . several type of floes was reached and its morphological characteristics was analyzed the fractal dimension , density and porosity of floes was studied by changing sticking probabilities , sticking position , particle number , particle concentration , difrusion coefficient and motion trajectory . the parameters by which special floes growth were determined . in the study of morphology , floes of yellow river ' s loess particles was observed by tv - microscope . its morphological characteristics were obtained by image analysis . the effect of fractal dimensions by stirring time strring speed , macromolecule flocculant dosage , flocculant concentration and particle concentration was studie . its rule of change was obtained . on the basis of other studies , the flocculation kinetics and floes structure was studied 本文应用计算机模拟技术,在二维空间内采用单体凝聚和集团? ?集团凝聚两种模型对颗粒凝聚过程进行了模拟,得到了多种形态的絮体,并对絮体进行了形态分析,通过改变粘附概率、粘附位置、颗粒数量、颗粒浓度、扩散系数和运动路径等模拟参数,我们考察了絮体分形维数、密度和孔隙率随模拟条件变化的影响规律,得到了形成特定形态絮体的控制参数。
Based on the preferable comparability of lithology between homogeneous core used in lab lest and that in strongly water washing part of inspection wells , forming condition of displacement efficiency in strongly water washing part of pressure coring inspection wells in waterflooded area has been analyzed , and reasons for the difference of displacement efficiency between pressure coring and in - house waterflood test have been discussed 摘要基于室内实验采用的均质岩心与检查井强水洗段岩性物性较好的相似性,通过对水淹区密闭取心检查井强水洗段驱油效率形成、室内水驱油模拟条件的分析,指出了密闭取心与室内水驱油实验驱油效率差别的原因。
The second chapter is about model experiment study , it introduces purpose , scheme , equipment and experiment contents having copperplate and copper ball as object by comparability rule experimenting plenty of physical models , deals with experiment data and makes second field attenuation voltage curves first field isoline both single aperture and mutli - aperture in different situation . in the end , it obtains best depth of multi - aperture source 利用相似性准则进行大量的物理模拟实验,实验观测中以铜板和铜球作为目标体,详细介绍了模拟实验研究的目的、方案、使用设备以及实验内容,并对实验数据进行了处理分析,作出了不同模拟条件下单、多孔径的二次场衰减电压曲线和一次场等值线图,找出多孔径作发射源的探测最佳深度。
In chapter six , based on the preceding chapters " research , the practicality of the full scale dr i 11 ing simulating test device has been tested by the debugging and the performance test . under simulating drilling conditions , the rock mechanical properties and the bits " dynamical tests are analyzed and set forth specifically . at the same time the effect of bottom pressure difference on the oil field exploration and development has been discussed 第六章在前述分析研究的基础上,通过对模拟装置的系统调试及性能测试,验证了全尺寸钻井模拟装置的实用性,在钻井模拟条件下对岩石的机械性质、牙轮钻头动态测试给予了具体的分析阐述,同时还分析探讨了井底压差对油田勘探开发的影illb ,并且为宋深101井的实际施工作业提供了非常有价值的指导参数。
Its invalidation of turning rupture leads to driving safety problems on the basis of research on the torsion bar spring in the suspension system , the paper finds the way to enhance the performance of the suspension system . the paper establishes the mathematical model of the double wishbone independent suspension , analyses the specific structure in theory , uses the softwares of adams and matlab to simulate the functions which are nearly similar with the actual working conditions . at the same time , the paper adopts the way of parameterized design , programs to adjust the system parameters conveniently and inducts the optimize design with the concrete targets to improve the suspension system performance 本文的研究方法是通过建立扭力杆与独立悬架的数学模型,以理论分析为基础,结合具体的悬架结构,运用adams和matlab软件,对研究的对象进行仿真分析,使设计人员在近似真实的模拟条件下能够更好的对目标进行研究;同时,还引入了参数化的设计方法,通过编程,增加了人机交互式界面,可灵活的对悬架导向机构主要构件的空间几何尺寸进行动态调整;在优化设计过程中,针对汽车悬架运动学、动力学的特定要求,对具体的目标进行优化设计,从而获得良好的行驶平顺性和操纵稳定性。