共查询到20条相似文献,搜索用时 93 毫秒
1.
换热器性能测试是换热器设计过程中的重要环节,对其结构优化及性能评估具有重要作用;针对传统的换热器性能测试系统存在试验周期长、组合方案少,自动化水平不高、可重用应用性较差等不足,文章基于工业控制计算机和C++ Builder软件平台开发了换热器性能试验测控与仿真系统;该系统实现了试验工况参数的控制与过程仿真、试验数据的采集记录与分析处理等各项操作的自动化;文章在简要介绍换热器性能测试系统硬件设计的基础上,具体结合系统硬件介绍了利用C++ Builder制作的换热器仿真实验测控系统的方法及过程,最后给出换热器性能测试仿真实验用户界面及仿真实验运行结果;试验结果表明,测控系统具有交互界面良好、使用方便,可靠性高等特点,能够较好地满足换热器性能测试的要求。 相似文献
2.
基于信息融合思想的水电仿真建模方法的研究 总被引:1,自引:1,他引:0
针对水电仿真建模中的复杂性、时变性等问题,将信息融合思想引入到水电仿真系统的建模过程中,利用融合系统的传感施动模型的系统化设计方法,提出了一种基于信息融合思想的水电仿真系统建模方法,为仿真系统建模提供了一种新的思路与方法。将该方法应用于丰满水电仿真系统调速系统的建模过程中,经实际应用表明,该模型在性能上优于传统的调速器仿真模型。 相似文献
3.
针对业务过程性能分析和优化多侧重于对已部署的业务过程进行事后的性能监控、管理和数据分析等问题,详细分析了业务过程性能和仿真优化的研究进展,提出了一种与企业模型和工作流模型相兼容的集成化业务过程仿真建模方法(IBPSM),并设计了支持IBPSM的多业务过程仿真工具(MBPST)原型系统。最后给出了一个具体的应用案例。实践表明这种事前的基于多业务过程仿真方法提供了业务过程性能的仿真分析与优化;同时可对优化后的业务过程进行快速部署,有利于业务过程的信息化实现。 相似文献
4.
文章分析了生产线制造过程的数字化制造环境,提出了基于扩展事件过程链的生产线制造过程建模仿真方法。在此基础上,采用面向对象软件方法,详细设计和实现了生产线制造过程建模仿真系统的各个组成模块。该软件系统应用于实际生产线的规划设计,对生产线进行仿真分析和性能优化,与CIMS其它子系统集成运行,提高了生产线制造过程的整体性能和经济效益。 相似文献
5.
6.
7.
接收天线的自动跟踪系统运行过程中常常会出现故障,传统的故障诊断方法极大地依赖技术人员的维护经验且效率较低;提出了一种基于Systemview的故障诊断方法,分析了影响自动跟踪系统性能的主要因素,以单通道单脉冲跟踪接收系统为例根据实际接收系统进行建模,给出了影响跟踪系统性能三种主要因素对应的仿真分析方法;仿真结果表明,该仿真分析方法能准确定位系统故障,将有效地增强跟踪系统的可维护性。 相似文献
8.
9.
为了优化和控制空调变频器的散热,提出了一种系统级的分析研究方法,使用一维流体仿真软件Flowmaster建立了空调变频器冷媒冷却系统的仿真模型,分析了系统的稳态性能和动态性能,并对系统控制进行了探索性研究。在设计过程中利用系统仿真代替样机调试,不仅大大减少了样机调试的周期,而且为系统的优化、控制及改进设计提供了依据。将高低温工况下的稳态及动态试验数据与仿真结果进行对比,验证了系统仿真的正确性。 相似文献
10.
11.
12.
本文设计了一种可以对外部干扰进行估计的高阶干扰观测器,并针对一类具有外部干扰的单输入单输出离散时间线性系统,提出了一种基于高阶干扰观测器的极点配置控制方法.该方法由常规极点配置控制器和高阶干扰观测器组成.常规极点配置控制器用来保证闭环系统稳定,并将闭环系统的极点配置到理想位置,高阶干扰观测器用来补偿外部干扰对闭环系统的影响.理论分析以及仿真和水箱液位系统中的实验结果表明了所提方法的有效性和优越性. 相似文献
13.
14.
This paper is concerned with the stabilization problem for a class of nonlinear systems with disturbance. The disturbance model is unknown and the first derivative of disturbance is bounded. Firstly, a general disturbance observer is proposed to estimate disturbance approximatively. Secondly, since the bound of the disturbance observer error is unknown, an adaptive sliding mode controller is designed to guarantee that the state of system asymptotically converges to zero and the unknown bound can be adjusted by an adaptive law. Finally, an example is given to illustrate the effectiveness of the proposed method. 相似文献
15.
This paper presents a new nonlinear robust disturbance observer by using only the input–output information for minimum phase dynamical systems with arbitrarily relative degrees. The model uncertainties, the nonlinear parts of the system are merged into the disturbance term, and are regarded as a part of the disturbance. The disturbance is assumed bounded. However, the upper and lower bounds are assumed unknown. The new disturbance observer is inspired by the VSS control theory, whereas the upper and lower bounds of the disturbance are adaptively updated. The estimation error of the disturbance can be made as small as necessary by choosing the design parameters. The attraction of the proposed method lies in its robustness to disturbance and easiness to be implemented. Example and simulation results show the effectiveness of the proposed algorithm. 相似文献
16.
Static disturbance‐to‐output decoupling problem for nonlinear systems with arbitrary disturbance relative degree is addressed in this paper without resorting to a high‐gain design. A systematic design method is developed for the design of the disturbance compensation gain in the control law. It is shown that the influence of the disturbance can be eliminated from the output channel in steady state with the proposed design method. More interesting, the exact disturbance decoupling methods turn out to be special cases of the proposed control law. The feasibility of extending the proposed method to unmeasurable disturbance case is also investigated by integrating a nonlinear disturbance observer. It is further discussed that the proposed method can be extended to multiple disturbance cases with almost no modification. Simulation example of a missile shows that the proposed method is effective in rejecting disturbance with arbitrary relative degree. Copyright © 2011 John Wiley & Sons, Ltd. 相似文献
17.
This paper addresses the problems of disturbance estimation and anti‐disturbance control for nonlinear system with exogenous disturbance, which is generated from an unknown exogenous system. The state observer and the adaptive disturbance observer are designed, simultaneously. Compared with the existing methods, which assumed that the exogenous system parameter matrix was known, our disturbance observer is more applicable in practice. Utilizing the estimation information, an observer‐based dynamic output feedback controller is designed, which avoids the influence of output disturbance on the closed‐loop system, and contains a disturbance compensation term to compensate the input disturbance. Finally, simulations are provided to demonstrate the effectiveness of the proposed approach. Copyright © 2016 John Wiley & Sons, Ltd. 相似文献
18.
针对一类具有未知外部干扰及内部不确定性的非线性MIMO系统,提出了基于神经网络干扰观测器的鲁棒跟踪控制方法,用于降低控制器对干扰的要求.设计了基于神经网络的干扰观测器,以逼近由外部干扰、内部不确定性和子系统的交叉耦合组成的复合干扰.根据Lyapunov稳定性理论的参数更新律及所设计的控制器,保证了系统中所有信号的最终一致有界性,并获得了给定的跟踪性能指标.仿真结果证明了该方法的有效性. 相似文献
19.
As well-known disturbance rejection methods, active disturbance rejection control and disturbance observer-based control can effectively improve the control performances of complex systems in the presence of disturbances. However, the accurate rejection of multiple disturbances for control systems of practical engineering, for example, the attitude control system of flexible spacecraft, is still a bottleneck problem. In order to further improve the anti-disturbance capability and reduce the conservativeness, this paper proposes a novel enhanced anti-disturbance control law for the attitude control system of flexible spacecraft by combining active disturbance rejection control and disturbance observer-based control in a unified framework. More specifically, the disturbance from flexible vibration is described by an uncertain exogenous system based on the partially known information including elastic damping ratios and modal frequencies. The disturbance observer-based control is utilized to estimate and thereby reject this disturbance. On the other hand, the other disturbances such as external environmental disturbance and complex model nonlinearity are merged into a equivalent disturbance with bounded derivative, which is compensated by using the active disturbance rejection control law. Stability and robustness analysis are carried out for the disturbance observer and extended state observer. Finally, simulation results of low-earth-orbit flexible satellite are presented to verify the effectiveness of proposed methods. 相似文献