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强非线性系统符号分析的两种新结果 总被引:4,自引:0,他引:4
本文讨论一大类非线性系统的谐波振荡。文中根据等效小参量法的原理分别导出了主振荡为单谐波和双谐波的两种通用的二阶近似方程。在此基础上,介绍了一种迭代算法和一种图解法。这两种方法基于符号分析,精确度较高,适用于强非线性系统。像通常的解析法,这种迭代算法也有助于掌握非线性振荡的机理。图解法则可以用来确定多解系统的全部周期解。 相似文献
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Wim Verhaegen Georges G. E. Gielen 《Analog Integrated Circuits and Signal Processing》2002,31(2):119-130
An efficient technique for the symbolic modeling of the frequency behavior of a linearized analog circuit is presented. It uses a compact graph representation based on the Laplace expansion of the system determinant, called determinant decision diagram or DDD. The construction of a circuit's DDD is explained and an analysis of the time and space complexity is given. These DDD's can be used in behavioral modeling by representing the exact numerical transfer function in a compact way. DDD's also enable the generation of symbolic transfer functions, resulting in a symbolic analysis technique with lower computational complexity than techniques not based on DDD's. 相似文献
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提出了电路的并行拓扑分析法。该方法将节点撕裂法引入拓扑分析,完成对电路的并行处理,实现计算机对较大规模电路的并行符号分析,拓宽了符号分析法的应用"瓶颈",提高了符号分析的速度与效率。 相似文献
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O. Guerra E. Roca F. V. Fernández A. Rodríguez-Vázquez 《Analog Integrated Circuits and Signal Processing》2002,31(2):131-145
This paper presents a methodology for the symbolic analysis of large analog integrated circuits using a hierarchical approach. The drawbacks of previous approaches are solved by the introduction of error-controlled approximation strategies. A proper modeling methodology through the different hierarchical levels allows to combine the optimum techniques for generation of the symbolic expressions and the most efficient numerical techniques for error control. These approximation strategies together with mechanisms for partitioning and union of blocks through the hierarchy yield optimum results in terms of speed, accuracy and complexity of the symbolic results. 相似文献
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张有志 《微电子学与计算机》1997,14(1):9-12
本文导出非线性时变RLC关于梯形算法和牛顿-拉夫逊算法的模型,提出一种便于用计算机对非线性时变RLC电路进行瞬态分析的新方法,并介绍一个基于这种方法设计的计算机程序。 相似文献
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目前采用仿真软件来分析电路时,一般在已知电路参数的情况下求数值解,或者得到电路仿真后的动态响应波形。而在电路的分析计算中,有时往往希望得到电路中待求量的解析解,方便进一步数学推导和理论分析计算。本文利用Matlab强大的符号处理能力进行电路的符号运算,并得到电路的解析表达式,为电路分析提供了一个有效的辅助手段。 相似文献
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基于电路理论和数值积分的原理,导出了非线性时变互感关于Backward Euler和Newton-Raphson算法的瞬态电路模型,将文献[1]中提出的非线性时变RLC电路瞬态分析的方法推广到含非线性时变互感的情况,使非线性时变RLCM电路的瞬态分析简化为若干线性时不变电阻性电路的直流分析。 相似文献
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Martin Keim Nicole Drechsler Rolf Drechsler Bernd Becker 《Journal of Electronic Testing》2001,17(1):37-51
A symbolic fault simulator is integrated in a Genetic Algorithm (GA) environment to perform Automatic Test Pattern Generation (ATPG) for synchronous sequential circuits. In a two phase algorithm test length and fault coverage as well are optimized. Furthermore, not only the Single Observation Time Test Strategy is supported, but also test patterns with respect to the Multiple Observation Time Test Strategy are generated. However, there are circuits that are hard to test using random pattern sequences, even if these sequences are genetically optimized. Thus, deterministic aspects are included in the GA environment to improve fault coverage. Experiments demonstrate that both a priori time consuming strategies, the symbolic simulation approach and the GA, can be combined at reasonable costs: Tests with higher fault coverages and considerably shorter test sequences than previously presented approaches are obtained. 相似文献
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对自动控制原理实验课程进行教学改革,设计了综合设计性实验———非线性系统分析与实验。采用Matlab对非线性系统进行了仿真,通过运算放大器设计了非线性模拟电路,并采用Multisim软件进行仿真,观测到了丰富的混沌行为。同时通过单片机处理器设计了数字电路,利用Proteus软件进行了仿真,结果与模拟电路基本一致,该实验从理论分析到模拟电路与数字电路软件仿真,从基本电路设计到具体实现,培养了学生的多学科的融合,工程能力程意识,激发了学生学习兴趣和创新精神。 相似文献
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在电路分析中,以经典电路理论探讨非线性电阻电路的问题。针对某些可以分段线性化的非线性电阻电路,当以曲线形式给出非线性电路的伏安特性时,探讨在凹电阻和凸电阻作基本积木块的方式下,依据电路KVL和KCL定律,运用串联分解法和并联分解法,分解拟合出满足分段线性要求的非线性电阻电路。通过对案例的仿真研究和误差分析,论证此方法在分析非线性电阻电路分段线性时,能比较方便地逆向解决以电路的伏安特性曲线完成实际电路的设计问题。 相似文献
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针对非线性跟踪微分器无法实现对所有输入信号的无差跟踪问题,研究3种不同形式跟踪微分器的稳态性能.通过分析抑制函数的特性和典型输入情况下系统的稳态误差,确定其适用范围,并对推论结果进行验证.仿真实验表明,非线性跟踪微分器为一阶无差系统,只能实现对阶跃输入信号的无差跟踪. 相似文献
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《Microwave Theory and Techniques》1985,33(1):30-37
The problem of analyzing the stability of periodic equilibrium regimes in nonlinear microwave circuits is tackled by a general-purpose computer-aided approach. By means of a perturbation technique, the search for instabilities is reduced to a generalized eigenvalue equation expressed in matrix form, and is then carried out by Nyquist's analysis. The use of a vector processor allows the computer time requirements to be kept well within reasonable limits, even in the case of large-size problems. In perspective, this could open the way to the complementation of existing nonlinear CAD packages by an on-line facility for automatic stability analysis. 相似文献
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本文提出线性模拟电路的单、双、三故障空间特征,采用分段线性模型(PWL)将非线性电路线性化,通过遗传算法求电路的容羞范围,用神经网络对非线性嘲络进行诊断。本文的方法大火减少了模拟计算量,同时,使神经网络的训练过程加快,训练误差减少,并大大提高了诊断的正确率。 相似文献