共查询到18条相似文献,搜索用时 281 毫秒
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汽车点火系统电磁干扰的仿真研究 总被引:1,自引:0,他引:1
点火系统作为车内最主要的电磁干扰源,点火时初级回路的瞬变电压引起的传导干扰将对蓄电池电压造成冲击,并通过导线干扰车内ECU和其它电子设备的正常工作,同时火花塞击穿时的高频火花噪声将对车内外的电磁环境造成极强的辐射干扰.为分析点火系统的电磁干扰特性,对点火过程中初级电路的瞬变电流和电压进行了仿真,并建立了次级回路火花塞放电等效电路模型,提出并计算了将高压导线等效为单极天线时车内的电场分布情况.研究表明,采用阻尼导线和增大火花塞内电阻都可以有效地抑制火花电磁噪声. 相似文献
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为开展恒压型热线风速测量系统的优化设计,建立了基于Multisim的电路仿真模型,其中,热线探头采用PSpice模型实现其特性的模拟,恒压控制回路中采用了T型动态补偿网络以提高系统的频响。进行了恒压型控制回路元件参数和流场流速对系统动静态性能影响的仿真分析及热线探头时间常数原位测量仿真。结果表明:从Multisim电路仿真模型得到流场流速、补偿网络参数、控制回路输入电压和电阻等对系统动静态特性的影响规律与数值计算的一致,验证了在Multisim中开展恒压型热线风速测量系统仿真研究的可行性,同时,这种针对实际电路参数的仿真分析对恒压型热线风速测量系统的优化设计和制备具有重要指导意义。 相似文献
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在高超声速流场准确测量的研究中,恒压型热线测量系统是进行高超声速流场测量的理想工具之一,其静态灵敏度系数和动态频响是两个主要性能指标,在系统试制过程中必须通过大量的流场试验调节控制回路的有关参数,以达到最优状态.为此建立了热线探头和恒压型控制回路的联合模型,利用Matlab就控制回路元件参数及流场流速对系统动静态性能影响进行数值仿真.通过仿真分析,获得了流场流速、补偿网络、控制回路中输入电压和电阻对系统性能的影响规律,采用补偿网络可提高系统频响须.仿真结果可为热线探头控制回路的优化设计提供参考. 相似文献
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结合锂离子电池双极性等效电路模型提出了一种基于遗传算法的参数识别方法,该方法通过指数函数对电路模型中的电阻、电容、恒压源等元件进行有理逼近,根据电池在不同充放电速率下的输出电压特性数据,通过实数编码遗传算法得到最优的函数参数,从而得到最优的电阻、电容,开路电压等电路参数值,针对电池在不同的工作状态,不同的工作参数下的运行数据,系列仿真和实验结果表明该算法原理简明,收敛较快,辨识得到的最优模型其电压输出特性与电池的实际电压输出特性基本吻合,能较精确的反映电池的实际特性,具有较高的辨识精度。 相似文献
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给出一类非线性LC电路的状态分析和数值模拟:将电容的电荷表示为相位角的简谐函数,电路的响应频率表示为相位角关于时间的变化率;以电路的响应频率为未知函数,对状态方程进行近似求解;算出时间随相位角变化的近似关系式;给出电路的相图、电容的电荷以及电感的磁通链随时间变化关系式及数值模拟,结果与数值积分法吻合良好。 相似文献
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A Nonlinear Observer Approach of SOC Estimation Based on Hysteresis Model for Lithium-ion Battery
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Yan Ma Bingsi Li Guangyuan Li Jixing Zhang Hong Chen 《IEEE/CAA Journal of Automatica Sinica》2017,4(2):195-204
In this paper, a state of charge (SOC) estimation approach for lithium-ion battery based on equivalent circuit model and the input-to-state stability (ISS) theory has been proposed. According to the electrochemical performance of lithiumion battery, the equivalent circuit model with two RC networks is established, which includes hysteresis characteristic in inner electrochemical response process.The nonlinear relation between open circuit voltage (OCV) and SOC is obtained from a rapid test.Exponential fitting method is used to identify the parameters of the model.A novel state observer based on ISS theory is designed for lithium-ion battery SOC estimation.The designed observer is tested on AMESim and Simulink co-simulation.The simulation results show that the proposed method has a high SOC estimation accuracy with an error of about 2 percent. 相似文献
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Roland E.Best Nikolay V.Kuznetsov Gennady A.Leonov Marat V.Yuldashev Renat V.Yuldashev 《国际自动化与计算杂志》2014,(6)
The analysis of stability and numerical simulation of Costas loop circuits for the high-frequency signals is a challenging task. The problem lies in the fact that it is necessary to observe very fast time scale of input signals and slow time scale of signal s phases simultaneously. To overcome this difficulty, it is possible to follow the classical ideas of Gardner and Viterbi to construct a mathematical model of Costas loop, in which only slow time change of signal s phases and frequencies is considered. Such an construction, in turn,requires the computation of phase detector characteristic, depending on the waveforms of the considered signals. In this paper, the problems of nonlinear analysis of Costas loops and the approaches to the simulation of the classical Costas loop, the quadrature phase shift keying(QPSK) Costas loop, and the two-phase Costas loop are discussed. The analytical method for the computation of phase detector characteristics of Costas loops is described. 相似文献
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该文首先分析了Logistic映射的一些典型的混沌特性,然后运用与其相类比的分析研究方法,诸如时间序列分析方法、相图分析方法和分岔图分析方法,对一个非自治电路进行了计算机分析与研究。通过对描述该非自治电路的非线性微分方程进行求解和计算机分析,可以看到,当输入电压的幅值改变时,该电路系统的动力学特性对输入电压幅值有很强的敏感性。在对该非自治电路的分岔图进行了详细的计算机分析后,指出了该非自治电路从倍周期通向混沌的分岔点。以此,说明了该非自治电路是典型的具有混沌特性的非线性电路。 相似文献
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本系统以MSP430单片机为控制核心,运用FPGA可编程逻辑器件及MSP430内部12位ADC实现对无源非线性端口网络导纳的测量。通过激励AD9850实现DDS信号输出,经AD811功率放大后,作为无源非线性端口网络的激励信号。将激励产生的电流信号经I/U转换后,分别送入AD637有效值检波电路和LM339整形电路,最后由ADC12采集检波后信号幅度,利用FPGA测量整形后电压信号的相位差,分别得到非线性端口网络的导纳数据,最终通过LCD显示无源非线性端口网络的导纳值与导纳角。 相似文献
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This paper presents an analysis method, based on MacCormack's
technique, for the evaluation of the time domain sensitivity of
distributed parameter elements in high-speed circuit networks.
Sensitivities can be calculated from electrical and physical
parameters of the distributed parameter elements. The proposed
method is a direct numerical method of time-space discretization and
does not require complicated mathematical deductive process.
Therefore, it is very convenient to program this method. It can be
applied to sensitivity analysis of general transmission lines in
linear or nonlinear circuit networks. The proposed method is
second-order-accurate. Numerical experiment is presented to
demonstrate its accuracy and efficiency. 相似文献
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This paper presents an analysis method, based on MacCormack's technique, for the evaluation of the time domain sensitivity of distributed parameter elements in high-speed circuit networks. Sensitivities can be calculated from electrical and physical parameters of the distributed parameter elements. The proposed method is a direct numerical method of time-space discretization and does not require complicated mathematical deductive process. Therefore, it is very convenient to program this method. It can be applied to sensitivity analysis of general transmission lines in linear or nonlinear circuit networks. The proposed method is second-order-accurate. Numerical experiment is presented to demonstrate its accuracy and efficiency. 相似文献