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To obtain transfer functions attached to linear time varying (Ltv) systems, a new method for getting the poles and residia of linear time invariant (Lti) continuous or discrete systems is proposed. The explored method is superior to others known, because it can be extended to systems with time varying parameters. With the poles and residia so obtained, the transfer function attached to the ltv systems, both continuous and discrete, results easily. 相似文献
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在区域导航系统基准站站间的时间同步中,因动态、干扰和测量信息不能及时共享等因素影响使测量数据突跳带来的时差野值问题,导致时间同步精度下降,严重影响导航系统的时间同步性能.本文基于双向时间比对同步技术,给出区域导航站间时间同步算法,并提出一种站间时间同步野值剔除方法和滤波方法,解决由不定因素带来的时差测量野值问题,提升系... 相似文献
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Modeling and analysis of multiconverter DC power electronic systems using the generalized state-space averaging method 总被引:1,自引:0,他引:1
This paper presents a modular approach for the modeling and simulation of multiconverter DC power electronic systems based on the generalized state-space averaging method. These systems may consist of many individual converters connected together to form large and complex systems. In addition to simplifying the analysis procedure, by using the proposed method, the time step for analysis of the system can be increased. Therefore, the required computation time and computer memory for complex systems can be reduced considerably. In this paper, after introducing the proposed approach, results of applying the method to a representative system are presented. 相似文献
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Stability Analysis and Practical Design Procedure of Time Delayed Control Systems With Communication Disturbance Observer 总被引:1,自引:0,他引:1
《Industrial Informatics, IEEE Transactions on》2008,4(3):185-197
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Mukhtar Ali 《Multidimensional Systems and Signal Processing》2018,29(4):1227-1239
In many cases it is impossible to remove the feedback during systems identification as it will make the system unstable. This paper presents an identification method for spatially interconnected distributed systems with identical subsystems operating in closed-loop feedback control. The proposed method takes into consideration the boundary conditions. The approach provides parameters estimate with minimum bias for unstable plant models when there is additive colored noise in output data. This yields consistent parameters estimate and, compared with other techniques to identify such systems under similar situations, takes far less time. The method is illustrated for two-dimensional systems (one for time and one for space), but is equally applicable for systems having more dimensions in space. The proposed technique is for general two-dimensional systems which may be causal, semi-causal (spatially interconnected systems) or non-causal. The effectiveness of the approach is demonstrated with a simulation example. 相似文献
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针对线性定常离散系统,本文将原定义于时域的能控性矩阵、能观性矩阵推广到频域上.研究表明:对于稳定系统,频域能控、能观矩阵等于时域能控、能观矩阵;但不稳定系统有频域能控、能观矩阵而无时域能控、能观矩阵.在此基础上,从频域角度提出了平衡实现的定义并导出一种新的线性离散系统平衡降阶方法,这种方法克服了传统Moore方法不能解决不稳定系统降阶问题的缺陷.本文详细给出了通过求解离散李亚普诺夫方程来计算频域能控、能观矩阵的过程,深入讨论了通过求解离散黎卡提方程来进行系统平衡降阶的新算法.一个关于离散不稳定系统的降阶算例显示:传统Moore方法完全失效,而本文的方法可行并得到满意的降阶效果. 相似文献
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多时滞离散切换系统反馈镇定 总被引:1,自引:0,他引:1
研究一类具有多时滞子系统的离散切换系统的稳定性分析和反馈镇定问题。通过状态变量的转换,将时滞切换系统变为不含时滞项的切换系统。以LMI形式给出了在任意切换信号作用下多时滞离散切换系统渐近稳定的充分性条件,以及系统状态反馈镇定、输出反馈镇定的控制器设计。并通过两个仿真实例验证所设计控制方案的有效性。 相似文献
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Xinzhi Liu Xuemin Shen Yi Zhang Qing Wang 《IEEE transactions on circuits and systems. I, Regular papers》2007,54(10):2288-2298
This paper studies stability problems of a class of impulsive systems with time delay whose linear parts contain unstable system matrices. By using the method of variation of parameters, Lyapunov functions and inequalities, several stability criteria are established for both linear and nonlinear impulsive systems with time delay. It is shown that the time delay systems can be stabilized by impulses even if the system matrices are unstable. Several numerical examples are given to illustrate the results. 相似文献
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High-speed electronic circuits are becoming more and more important in modern communication systems, thus leading to an increasing interest in printed circuit boards, interconnect, and packaging. Nowadays, full-wave numerical methods are widely used in order to investigate both signal integrity and electromagnetic compatibility issues arising in PCBs design. When broadband information is desired and transient effects dominate, it is more efficient using time domain numerical techniques, which may scale better than corresponding frequency-domain methods. This paper presents the derivation of the time domain partial element equivalent circuit (PEEC) method enhanced by the three-dimensional (3D) fast multipole method (FMM). It is shown that combining the full-wave time domain PEEC method with the FMM allows performing the analysis of electrically large electronic systems, which reduces both memory and CPU-time requirements. Several examples are presented confirming the capability of the proposed approach to provide a significant reduction of the computational complexity associated with the transient analysis of large systems. 相似文献
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综合化航空电子系统变得越来越复杂,对总线速率和确定性的要求也越来越高,而时间触发传输可以使光纤通道总线具有确定性。针对采用通用时间调度算法较复杂的问题,提出了一种基于分区域调度的时间触发确定性传输方案,采用循环移位调度的通用化方法生成时间调度表。详细介绍了时间确定性传输方法的基本原理、循环移位调度方法以及具体实现方案,最后通过仿真验证表明该方法正确可行。该方法简单易行,可应用于综合化航空电子系统中。 相似文献
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脉冲辐射源时差定位的新方法 总被引:1,自引:1,他引:0
脉冲辐射源定位系统主要用于对空基、地基和海基目标的时短信号辐射源进行检测和定位。现有的脉冲辐射源定位系统大都属于长基线系统。本文提出在有限空间环境下进行时差定位的新方法,并对系统的定位精度进行了仿真,提出了实现系统所需的关键技术。 相似文献
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Dynamic memory allocators for real‐time embedded systems need to fulfill three fundamental requirements: bounded worst‐case execution time, fast average execution time, and minimal fragmentation. Since embedded systems generally run continuously during their whole lifetime, fragmentation is one of the most important factors in designing the memory allocator. This paper focuses on minimizing fragmentation while other requirements are still satisfied. To minimize fragmentation, a part of a memory region is segregated by the proposed budgeting method that exploits the memory profile of the given application. The budgeting method can be applied for any existing memory allocators. Experimental results show that the memory efficiency of allocators can be improved by up to 18.85% by using the budgeting method. Its worst‐case execution time is analyzed to be bounded. 相似文献
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一种改进的最优PID参数自整定控制方法 总被引:1,自引:0,他引:1
为了解决大滞后系统控制难度大的问题,针对非线性、大时变、大延迟的控制对象,设计一种带嵌入式函数的最优PID参数自整定控制方法,通过仿真实验与ISTTE最优准则下最优PID参数自整定控制方法进行了比较,给出仿真波形及其分析,通过仿真实验结果表明该控制方法不仅具有PID控制器高精度、稳定性、鲁棒性高的优点,另外可以缩短系统的调节时间,有效地抑制系统的超调,从而可以有效改善大滞后系统的控制效果。 相似文献
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实时硬件系统中控制方法的研究 总被引:1,自引:1,他引:0
由于实时硬件系统的规模和复杂度不断增大,系统结构的模块化设计已成为硬件系统开发的发展趋势。研究了硬件系统中模块控制的方法和特点。结合MPEG2电视编码器中各功能模块的特点,提出了适合该硬件系统的模块控制方案,说明了控制模块的硬件设计思想和软件实现。实践证明,该方案满足系统实时性和可靠性的设计要求。 相似文献
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Zhu Qi 《中国邮电高校学报(英文版)》1997,(1)
StudyofTimeDelayEstimationforMultichannelNoiseSuppresionSystemZhuQi(DepartmentofRadioEngineering,NanjingUniversityofPostsandT... 相似文献
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防止电影被录象机复制是在有线电视系统中放映新电影的一个重要问题,特别是在按次收费(PPV)业务上。由于存在复制威胁,电影制片厂不愿过早地在有线电视网上放映新电影,这样又反过来影响有线电视收视率。针对这一问题,介绍了伪同步AGC方法、彩色条方法和时基变化方法等几种防复制技术,重点介绍了一种基于时基变化方法的有线电视防复制系统。 相似文献