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根据油井的静态与动态参数,建立了以波动方程为基础的抽油机悬点与泵示功图的计算机仿真模型。以仿真示功图为基础,建立了抽油机井系统效率的仿真模型,并重点改进了有效功率与电动机输入功率的仿真模型,其中包括:(1)考虑了泵余隙容积内气体的压缩与膨胀,改进了排量系数的计算模型;(2)考虑了地面传动系统能量流动方向的变化与传动效率的影响,改进了曲柄轴净扭矩与电动机输出功率的计算模型;(3)考虑了电动机瞬时负载率对电动机运行效率的影响,改进了电动机输入功率的计算模型。所建立的系统效率仿真模型具有较高的仿真精度和广泛的适应性。 相似文献
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应用幂律流体本构方程和动量守衡方程,建立了抽油机井杆管环空幂律流体速度分布规律与杆柱液体摩擦力的计算模型,以此为基础建立了聚合物驱抽油杆柱纵向振动仿真的非线性波动方程。与抽油杆柱纵向振动的常规波动方程比较,新模型含有速度幂律指数的非线性液体摩擦力项,应用差分法建立了非线性波动方程的数值仿真模型。根据一个周期液体摩擦功相等的原则,将非线性液体摩擦力项线性化,建立了等效阻尼系数的计算方法,并将非线性波动方程简化为常规波动方程。开发了聚合物驱抽油机井杆柱纵向振动的仿真软件,分析了流变参数对抽油杆柱纵向振动与示功图的影响。仿真与实测结果对比表明,非线性波动方程仿真模型具有较高的仿真精度,悬点最大与最小载荷的仿真误差小于±12%。 相似文献
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基于多质点的城轨列车牵引计算分析与仿真 总被引:1,自引:0,他引:1
为了优化城市轨道列车牵引运行过程,使其运行更为准确、切近实际,通过建立列车多质点模型,以列车运动学方程为基础,采用混合优化牵引策略,对列车运行过程进行仿真。在牵引和制动受力分析过程中采用线性插值法,制动点选取通过反向试凑法获得。根据所设定的列车参数和线路参数,用Matlab进行编程与仿真。仿真结果表明,多质点模型与单质点模型相比可以有效提高列车经过变曲率段和变坡道段的附加阻力精度;线性插值法和混合优化牵引策略的应用,使牵引仿真过程更为接近实际运行过程,符合城轨列车准确、快速的运行要求,为城轨列车自动驾驶研究提供必要的理论依据。 相似文献
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反舰导弹捕捉能力建模与仿真 总被引:7,自引:1,他引:6
为可靠计算反舰导弹捕捉能力、科学精确使用导弹,提出过程与效能一体化仿真概念,构建了反舰导弹作战使用仿真环境.运用物理原型剖析法建立反舰导弹捕捉目标的概念模型,运用机理建模方法建立数学模型,采用离散化方法建立仿真模型.运用Delphi软件开发面向对象的过程与效能一体化仿真环境.应用蒙特卡洛法对某型反舰导弹捕捉能力进行统计,经过与传统解析法计算结果比对表明该模型是可靠有效的.指出仿真方法是反舰导弹捕捉能力计算的有效方法. 相似文献
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《系统工程理论与实践》2014,(5)
正August 10-14,2015Beijing,ChinaThe International Congress on Industrial and Applied Mathematics(ICIAM)is the premier international congress in the field of applied mathematics held every four years under the auspices of the International Council for Industrial and Applied Mathematics.From August 10 to 14,2015,mathematicians,scientists 相似文献
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《系统科学与系统工程学报(英文版)》2014,(2)
正AF:Any Field The School of Economics and Management at Tsinghua University(Tsinghua SEM)invites applications for faculty positions at all levels(Assistant Professor,Associate Professor and Full Professor)in any fields of business administration and management.Tsinghua SEM is the only school 相似文献
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The paper is about negotiating with issues that discourage innovation. The subject is environmental deterioration, with concern directed at the impediments that keep it from being innovatively resolved. The paper is organized around three issues. (1) The dominant model of environmental concern, called environmental protection, is managed predominantly via command and control approaches. (2) Command and control, by relying on analytical segmentation to subdivide the problem into digestible bits and using formal legislation to direct it, are not up to emerging challenges in the area. (3) More robust models are available but difficult to experiment with due to impediments that discourage change. These impediments are seen in ideals associated with protection, prevention, recycling, and sustainability that tend to do more to sustain harmful practices than to seek beneficial alternatives. Being able to appreciate the underlying restrictions of entropy could help stimulate a more innovative agenda. These issues are tested via a project funded by the EPA entitled ENERGY STAR Homes. 相似文献
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This paper presents an outline of an Oriental systems methodology: the Wuli Shili Renli approach (WSR). The basic theme of WSR contends that wuli (regularities in objective existence), shili (ways of seeing and doing), and renli (patterns underlying human relations) constitute a differentiated whole that conditions systems projects. WSR suggests that we should design and employ appropriate methods to address and tackle wuli shili and renli elements in a theoretically informed and systemic way. The background, philosophy, process, principles, and some practical applications of the methodology are preliminarily outlined. 相似文献
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