机床能量消耗过程的评估和分析是机床能效优化研究的基础。现有研究提出的机床能耗模型主要是静态能耗模型,少数对机床动态性能耗的研究又主要集中在机床运行状态的动态性的建模,缺乏对机床能量源特别是数控机床多能量源的动态性能耗的...机床能量消耗过程的评估和分析是机床能效优化研究的基础。现有研究提出的机床能耗模型主要是静态能耗模型,少数对机床动态性能耗的研究又主要集中在机床运行状态的动态性的建模,缺乏对机床能量源特别是数控机床多能量源的动态性能耗的研究。针对数控机床能量源多、加工任务及加工参数动态变化等特点,提出了一种数控机床多能量源的动态能耗建模与仿真方法。对数控机床能耗过程的动态性进行分析;在此基础上,结合面向对象着色赋时Petri网(Colored timed object-oriented Petri net,CTOPN)和虚拟部件方法建立数控机床多能量源动态能耗模型,其中CTOPN模型用于描述数控机床能耗过程机床和多能量源运行状态的动态特性,虚拟部件方法用于描述数控机床多能量源受加工参数影响的动态特性;通过CTOPN中'变迁'蕴含的信息来驱动虚拟部件模型实现对数控机床多能量源的动态能耗特性的建模。案例分析结果证明了该方法的可行性,上述模型可为数控机床动态能耗的预测、综合的能耗特性分析以及定量的能耗影响因素分析提供一种基础支持,具有较广阔的应用前景。展开更多
As an indispensable energy source, lignite is almost exclusively used in power generation m TurKey, To assess me quality level of Turkish lignite, a multivariate statistical analysis was conducted. The relationship am...As an indispensable energy source, lignite is almost exclusively used in power generation m TurKey, To assess me quality level of Turkish lignite, a multivariate statistical analysis was conducted. The relationship among the lignite quality parameters has been investigated using a response method that is the logistic regression method. The analysis determines the effect of multiple predictor variables such as moisture, ash and sulphur presented simultaneously to predict membership of the two calorific value categories. By this way, a reliable binary response regression structure was constructed considering all the lignite fields in Turkey. Both the experiments on identifying the influential measurements and the measure of goodness of fit indicated that the overall model has a big capability to exhibit the relationship among the parameters of the Turkish lignite.展开更多
An energy effi cient resource allocation scheme in timesharing multiuser system with a hybrid energy harvesting transmitter is studied in this paper. Specially, the operation energy of system is supplied by constant e...An energy effi cient resource allocation scheme in timesharing multiuser system with a hybrid energy harvesting transmitter is studied in this paper. Specially, the operation energy of system is supplied by constant energy and energy harvesting, which harvests energy from external environment. Our goal is to maximize the energy effi ciency of timesharing multiuser systems by considering jointly allocation of transmission time and power control in an off-line manner. The original nonconvex objective function is transformed into convex optimization problem via the fractional programming approach. Then, we solve the convex problem by Lagrange dual decomposition method. Simulation results show that the proposed energy efficient resource allocation scheme has a better performance than the scheme which decomposes optimization problem into two parts(power allocation, time allocation) to solve iteratively.展开更多
文摘机床能量消耗过程的评估和分析是机床能效优化研究的基础。现有研究提出的机床能耗模型主要是静态能耗模型,少数对机床动态性能耗的研究又主要集中在机床运行状态的动态性的建模,缺乏对机床能量源特别是数控机床多能量源的动态性能耗的研究。针对数控机床能量源多、加工任务及加工参数动态变化等特点,提出了一种数控机床多能量源的动态能耗建模与仿真方法。对数控机床能耗过程的动态性进行分析;在此基础上,结合面向对象着色赋时Petri网(Colored timed object-oriented Petri net,CTOPN)和虚拟部件方法建立数控机床多能量源动态能耗模型,其中CTOPN模型用于描述数控机床能耗过程机床和多能量源运行状态的动态特性,虚拟部件方法用于描述数控机床多能量源受加工参数影响的动态特性;通过CTOPN中'变迁'蕴含的信息来驱动虚拟部件模型实现对数控机床多能量源的动态能耗特性的建模。案例分析结果证明了该方法的可行性,上述模型可为数控机床动态能耗的预测、综合的能耗特性分析以及定量的能耗影响因素分析提供一种基础支持,具有较广阔的应用前景。
文摘As an indispensable energy source, lignite is almost exclusively used in power generation m TurKey, To assess me quality level of Turkish lignite, a multivariate statistical analysis was conducted. The relationship among the lignite quality parameters has been investigated using a response method that is the logistic regression method. The analysis determines the effect of multiple predictor variables such as moisture, ash and sulphur presented simultaneously to predict membership of the two calorific value categories. By this way, a reliable binary response regression structure was constructed considering all the lignite fields in Turkey. Both the experiments on identifying the influential measurements and the measure of goodness of fit indicated that the overall model has a big capability to exhibit the relationship among the parameters of the Turkish lignite.
基金supported in part by the National Natural Science Foundation of China(61471115)in part by the 2016 Science and Technology Joint Research and Innovation Foundation of Jiangsu Province(BY2016076-13)
文摘An energy effi cient resource allocation scheme in timesharing multiuser system with a hybrid energy harvesting transmitter is studied in this paper. Specially, the operation energy of system is supplied by constant energy and energy harvesting, which harvests energy from external environment. Our goal is to maximize the energy effi ciency of timesharing multiuser systems by considering jointly allocation of transmission time and power control in an off-line manner. The original nonconvex objective function is transformed into convex optimization problem via the fractional programming approach. Then, we solve the convex problem by Lagrange dual decomposition method. Simulation results show that the proposed energy efficient resource allocation scheme has a better performance than the scheme which decomposes optimization problem into two parts(power allocation, time allocation) to solve iteratively.
