提出考虑热能输运动态特性的电-热综合能源系统(integrated energy systems,IES)优化调度方法。首先针对热网的延时和储热等动态特性,提出一种热能输运准动态模型,分析了热网的虚拟储能潜力;进而结合能源设备模型,提出一种考虑热能输运...提出考虑热能输运动态特性的电-热综合能源系统(integrated energy systems,IES)优化调度方法。首先针对热网的延时和储热等动态特性,提出一种热能输运准动态模型,分析了热网的虚拟储能潜力;进而结合能源设备模型,提出一种考虑热能输运动态特性的电-热IES优化调度方法,将热网作为调度资源参与到电-热IES优化运行中,实现对热网虚拟储能的调度利用。仿真结果表明,该方法由于考虑了热能传输动态特性,可充分发掘热网虚拟储能在分时电价的激励下,参与电-热IES经济优化运行的调节潜力,有效利用电、热系统的互补特性,降低IES运行成本。展开更多
To gain a thorough understanding of the load state of parallel kinematic machines(PKMs), a methodology of elastodynamic modeling and joint reaction prediction is proposed. For this purpose, a Sprint Z3 model is used a...To gain a thorough understanding of the load state of parallel kinematic machines(PKMs), a methodology of elastodynamic modeling and joint reaction prediction is proposed. For this purpose, a Sprint Z3 model is used as a case study to illustrate the process of joint reaction analysis. The substructure synthesis method is applied to deriving an analytical elastodynamic model for the 3-PRS PKM device, in which the compliances of limbs and joints are considered. Each limb assembly is modeled as a spatial beam with non-uniform cross-section supported by lumped virtual springs at the centers of revolute and spherical joints. By introducing the deformation compatibility conditions between the limbs and the platform, the governing equations of motion of the system are obtained. After degenerating the governing equations into quasi-static equations, the effects of the gravity on system deflections and joint reactions are investigated with the purpose of providing useful information for the kinematic calibration and component strength calculations as well as structural optimizations of the 3-PRS PKM module. The simulation results indicate that the elastic deformation of the moving platform in the direction of gravity caused by gravity is quite large and cannot be ignored. Meanwhile, the distributions of joint reactions are axisymmetric and position-dependent. It is worthy to note that the proposed elastodynamic modeling method combines the benefits of accuracy of finite element method and concision of analytical method so that it can be used to predict the stiffness characteristics and joint reactions of a PKM throughout its entire workspace in a quick and accurate manner. Moreover, the present model can also be easily applied to evaluating the overall rigidity performance as well as statics of other PKMs with high efficiency after minor modifications.展开更多
文摘提出考虑热能输运动态特性的电-热综合能源系统(integrated energy systems,IES)优化调度方法。首先针对热网的延时和储热等动态特性,提出一种热能输运准动态模型,分析了热网的虚拟储能潜力;进而结合能源设备模型,提出一种考虑热能输运动态特性的电-热IES优化调度方法,将热网作为调度资源参与到电-热IES优化运行中,实现对热网虚拟储能的调度利用。仿真结果表明,该方法由于考虑了热能传输动态特性,可充分发掘热网虚拟储能在分时电价的激励下,参与电-热IES经济优化运行的调节潜力,有效利用电、热系统的互补特性,降低IES运行成本。
基金Project(Kfkt2013-12)supported by Open Research Fund of Key Laboratory of High Performance Complex Manufacturing of Central South University,ChinaProject(2014002)supported by the Open Fund of Shanghai Key Laboratory of Digital Manufacture for Thin-walled Structures,ChinaProject(51375013)supported by the National Natural Science Foundation of China
文摘To gain a thorough understanding of the load state of parallel kinematic machines(PKMs), a methodology of elastodynamic modeling and joint reaction prediction is proposed. For this purpose, a Sprint Z3 model is used as a case study to illustrate the process of joint reaction analysis. The substructure synthesis method is applied to deriving an analytical elastodynamic model for the 3-PRS PKM device, in which the compliances of limbs and joints are considered. Each limb assembly is modeled as a spatial beam with non-uniform cross-section supported by lumped virtual springs at the centers of revolute and spherical joints. By introducing the deformation compatibility conditions between the limbs and the platform, the governing equations of motion of the system are obtained. After degenerating the governing equations into quasi-static equations, the effects of the gravity on system deflections and joint reactions are investigated with the purpose of providing useful information for the kinematic calibration and component strength calculations as well as structural optimizations of the 3-PRS PKM module. The simulation results indicate that the elastic deformation of the moving platform in the direction of gravity caused by gravity is quite large and cannot be ignored. Meanwhile, the distributions of joint reactions are axisymmetric and position-dependent. It is worthy to note that the proposed elastodynamic modeling method combines the benefits of accuracy of finite element method and concision of analytical method so that it can be used to predict the stiffness characteristics and joint reactions of a PKM throughout its entire workspace in a quick and accurate manner. Moreover, the present model can also be easily applied to evaluating the overall rigidity performance as well as statics of other PKMs with high efficiency after minor modifications.
