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在介绍巷道堆垛式自动化立体车库工作的基础上,建立了约束条件下的车辆入库、出库、因车位存满而离去的就近存取和随机存取策略车库工作模型。以车辆到达时间间隔服从泊松分布,库内存放时间服从正态分布的情况建立数学模型,采用Matlab编制仿真程序,对特定参数的模型进行了仿真,并给出分析结果。结果表明在文中参数设定情况下该车库车位利用率较高,采用就近存取策略比采用随机存取策略堆垛机运行距离短,能耗低,全年能耗降低显著。 相似文献
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本文通过对风速的分解,建立了实际风速的综合模型,在风机动态特性分析的基础上,建立了双馈电机及控制系统的仿真模型。所建立的模型具有通用性,便于Matlab/Simulink的仿真分析。 相似文献
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本文利用ADAMS/VIEW软件对散装物料半挂运输车建立整车多刚体动力学模型,进行脉冲路面输入的平顺性仿真分析。仿真结果符合要求,验证了整车模型建立的正确性,为进一步的设计分析提供了依据。 相似文献
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基于离散事件的动态系统理论,文中建立了杂货码头物流作业流程的仿真模型。最后,借助Witness仿真平台建立了杂货码头物流系统仿真模型。该模型主要用来分析杂货码头的机械调度模式、装卸工艺、生产作业能力、设备优化配置以及其它作业工况。 相似文献
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We document the one-way relationship between individual new energy consumption and economic growth in China through the autoregressive distributed lag (ARDL) model from 2004 to 2017. Our results show that individual new energy consumption has a positive effect on economic growth. Moreover, the urbanization rate, import and export trade volume and foreign direct investment all affect the individual new energy consumption in the short run. The outcome of the causality test reveals a one-way Granger causal relationship from individual new energy consumption to economic growth, from the urbanization rate, and from the import and export trade volume to new energy consumption. 相似文献
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针对钢铁生产中为减轻混装的影响在冷热板坯混装处空炉的情况,以提高成品质量、降低能耗为目标,建立了混装工艺下并行加热炉调度的数学模型,并提出了基于粒子群算法和邻域搜索技术的混合算法,仿真实验验证了算法的可行性和有效性。 相似文献
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《Journal of urban economics》2013,73(2-3):147-159
Urban land use and transportation policies have dramatic effects on the density and spatial distribution of residences in large cities. Effects of these policies have been analyzed using numerical urban simulation models. At the same time, the US Energy Information Administration’s Residential Energy Consumption Survey has allowed researchers to investigate the relation between household energy consumption and characteristics of housing units.This paper links these two lines of inquiry by demonstrating how simulation results on the implications of land use and transportation policies for the spatial form of cities can be used to compute implications for energy consumption. The resulting Urban Energy Footprint Model, “UEFM,” allows one to trace the implications of a change in land use zoning or transportation policy through its effects on housing markets and residential location to the resulting changes in energy use for residential and commuting purposes – i.e. to understand the energy footprint of transportation, housing, and land use policies. Accordingly, the UEFM provides, perhaps for the first time, a link between urban and energy economics, and can allow measurement of rebound effects of energy policies in a more general equilibrium context. 相似文献
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研究目标:测度改革开放近40年来,中国异质性能源消费与经济增长的非线性动态驱动机制。研究方法:基于煤炭、石油、天然气、电力消费以及GDP年度数据,运用马尔科夫区制转移因果(MSC) 模型开展实证研究。研究发现:经济增长能够促进煤炭、石油、天然气和电力等异质性能源消费的提高,其中,石油和天然气消费的增加能够推动经济增长。经济增长对煤炭和石油消费的驱动作用持续期较长,对天然气和电力消费的驱动作用持续期较短,四种能源消费对经济增长驱动作用的时间长度大致相同。近年来,石油消费能够表现出对经济增长的非线性动态驱动作用,经济增长能够对石油和煤炭消费发挥非线性动态驱动作用。在金融危机时期,难以表现出经济增长对能源消费的单向时变因果影响,其中,煤炭、石油和天然气消费无法表现出对经济增长的单向时变因果影响,而电力消费对经济增长存在单向时变因果影响。研究创新:基于MSC模型,判断不同时段内异质性能源消费与经济增长的时变因果关系,进而揭示两者之间的非线性动态驱动机制。研究价值:为中国完成能源产业结构转型以及构建新时代能源产业体系提供经验证据。 相似文献
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研究目标:检验不同方法之间TFP测算结果的“一致性”和“稳健性”,探讨测算方法和数据选取问题。研究方法:以中国2004~2012年总量分行业面板数据为例,从多个角度比较TFP测算结果,以及通过统计检验选取适用测算方法。研究发现:第一,研究的问题不同,测算方法之间“一致性”的检验结论不同;第二,在选择测算方法时,进行相关统计量检验是必要的,这有助于鉴别模型设定是否合理,缩小可选模型范围;第三,测算方法的选择,要符合数据本身的特征,基于宏观分行业面板数据,DEA是更为适用的TFP测算方法,而劳动力投入应选取全社会从业人员指标。研究创新:多种测算方法和统计检验的应用。研究价值:本文尝试构建如何选择TFP测算方法的一般框架。 相似文献
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游梁式抽油机是我国石油开采中最普遍使用的有杆泵采油地面设备之一,采取相应措施降低其能耗为多年来国内外研究的热点,近年来,矢量控制在变频调速中的应用日趋成熟,本文利用MATLAB软件成功实现了对游梁式抽油机电机拖动系统的仿真分析,对油田上最常见的三相异步电机进行了分析,搭建了矢量控制下的异步电机的数学模型,同时对抽油机的四连杆结构、三相异步电机建模,最后通过采取现场数据验证的方式证明了仿真的正确性,对今后矢量控制应用于抽油机电力拖动系统的节能改造提供了理论支持。 相似文献
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基于我国1990-2011年GDP数据和国内能源消费总量数据的协整性分析和因果检验,初步确认经济增长和能源消费具有协整性关系。当前国家经济发展,能源消费还是占很大比例,但结果也表明随着经济的发展,其对能源的依赖已经大大缩小。 相似文献
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China has relied on energy to stimulate its booming economy. As a result, its share of world energy consumption rose to 17.3% in 2009 from 7.9% in 1978. Somewhat surprisingly, through 2000 its rate of energy consumption was about half its rate of economic growth. This trend changed after 2001 as energy consumption rose about 1.3 times more rapidly than did gross domestic product through 2005. Through heavy governmental influence, energy intensity subsequently reduced through 2007, but just marginally. This paper uses the structural decomposition approach to understand key drivers behind changes in China's energy intensity and its energy consumption from 1987 to 2007. In our model, energy intensity change was decomposed into five factors: changes in energy efficiency, changes in share of value added, changes in input structure, changes in consumption structure, and changes in consumption volume. This paper provides insights into how changes in China's economic structure, technology, urbanization, and lifestyle affect energy intensity and energy consumption. 相似文献
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John M. Quigley 《Review of urban and regional development studies : RURDS : journal of the Applied Regional Conference》1991,3(1):28-38
This paper integrates and compares me results of two large-scale econometric analyses of the effects of residential energy prices upon the U.S. housing market. A simple model of energy consumption in the housing market is developed, and the results of these studies are compared with the common model. The two studies, using very different bodies of data and very different econometric techniques, yield very similar implications in terms of household expenditures and patterns of consumption. In particular, both studies confirm the importance of "natural conservation" in the housing market. Higher energy prices lead to substantially lower consumption of residential energy, even in the absence of regulation. In particular, it is estimated that a doubling of energy prices leads to a reduction of residential energy consumption of about twenty-five percent. 相似文献