啁啾脉冲在正常色散光纤中频域特性实验研究

对负啁啾脉冲在正常色散光纤中的频域特性进行了实验研究,并对实验结果进行了数值分析,实验和数值分析结果基本一致．     

偏振光的干涉场分布特征数值模拟及实验研究

从偏振光的产生出发,对不同偏振态的偏振光的干涉场分布进行了数值模拟,得出了不同偏振态干涉场的特征分布,并对不同情况进行了实验,分析讨论了实验结果,为偏振光实验的教学和实验结果的分析提供了依据.     

倾斜轨道上运动小球实验探讨

本文对小球在倾轨道上的运动规律进行了理论上的分析．为验证理论结果，设计了实验装置，进行了实验．实验结果证明理论分析是正确的．     

基于多信息融合回流离子特性的实验研究

简要介绍了回流离子特性参数的检测要求,分析了多种不同检测方法的特点,进行了离子检测综合实验方案的设计。介绍了激光干涉+分幅相机测量、法拉第筒测量、基于单晶硅片的固体径迹测量3种实验方法及实验结果的分析过程,对各自的原始实验数据进行了具体分析,给出了分析结果。对3种实验方法的分析结果,采用信息融合技术,对电子束打靶时所产生的回流离子的种类、运动速度和密度等特性给出了综合性的分析结论,有助于进一步正确认识束靶作用区的物理特性。     

偏翼标模小滚转力矩测量与气浮轴承动态特性研究

基于气浮轴承的自由滚转实验技术是测量再入飞行器小不对称滚转气动力的重要方法.文章研究中对偏翼标模进行了小滚转力矩测量,并针对实验系统的特点,对气浮轴承进行了无风实验标定和真空实验标定,给出了其动态特性结果.进一步分析了气浮轴承动态特性、原始数据采集测量误差和参数辨识误差对实验结果的影响,并给出了综合误差分析结果,说明了...     

基于多信息融合回流离子特性的实验研究

 简要介绍了回流离子特性参数的检测要求,分析了多种不同检测方法的特点,进行了离子检测综合实验方案的设计。介绍了激光干涉+分幅相机测量、法拉第筒测量、基于单晶硅片的固体径迹测量3种实验方法及实验结果的分析过程,对各自的原始实验数据进行了具体分析,给出了分析结果。对3种实验方法的分析结果,采用信息融合技术,对电子束打靶时所产生的回流离子的种类、运动速度和密度等特性给出了综合性的分析结论,有助于进一步正确认识束靶作用区的物理特性。     

家用空调冷凝器的仿真与实验研究

为了缩短对家用空调冷凝器的性能研究时间和开发新产品的周期,开发了冷凝器仿真程序。利用分布参数模型对家用空调冷凝器进行仿真计算,并设计建立了冷凝器实验装置,对仿真结果进行实验验证。对冷凝器进行了在不同风速,不同冷凝温度下的实验,进行分析得到实验结果。并将其与仿真程序的计算结果进行了比较。通过比较证明了仿真结果和实验结果总体变化趋势一致;在相同工况下,模拟换热量的数值比实验换热量要低7.7%~12%;由此验证了仿真程序的可行性。     

螺旋槽管换热器管内流动和换热特性的实验研究

以水为介质,对螺旋槽管管内流体的流动特性、换热特性进行了实验研究。分析了流速、温度对流动特性,换热特性的影响。在该实验研究中,进行了实验测得摩擦压降与经典公式拟合得出的计算结果误差分析,验证了实验结果的准确度;进行了Nu的值与迪图斯-贝尔特公式拟合得出的计算结果误差分析,验证了实验结果的准确度;提出了预测套管式换热器热工性能的新方法。螺旋管换热器在管内流体Re范围为41000-58000时,换热器的热工性能较好。     

热敏电阻数字温度计设计制作实验的线性化方案探究

分析了半导体热敏电阻制作电子数字温度计的原理,对两种线性化设计方案及其实验结果进行了比较,对实验的教学进行了探讨.     

激波管风洞中叶栅测压实验与计算研究

本文利用激波管平面叶栅风洞在四种工况下进行了某叶型叶表压力分布测量实验。该类短周期实验方式的测量精度是值得关注的大问题，为此文中对实验误差及短周期实验测量的合理性进行了分析。继而将实验数据与两种模型下的数值计算结果进行了比较，其中实验结果与按实际情况建立的模型１计算结果吻合。通过实验结果与模型２计算结果比较发现，实验中存在着影响叶栅通道流动周期性的因素，本文仔细分析了该因素可能产生的影响，为今后对该风洞实验段进行改造提供了基础。     

The voltage-current relationship and equivalent circuit implementation of parallel flux-controlled memristive circuits

A flux-controlled memristor characterized by smooth cubic nonlinearity is taken as an example, upon which the voltage-current relationships （VCRs） between two parallel memristive circuits - a parallel memristor and capacitor circuit （the parallel MC circuit）, and a parallel memristor and inductor circuit （the parallel ML circuit） - are investigated. The results indicate that the VCR between these two parallel memristive circuits is closely related to the circuit parameters, and the frequency and amplitude of the sinusoidal voltage stimulus. An equivalent circuit model of the memristor is built, upon which the circuit simulations and exper/mental measurements of both the parallel MC circuit and the parallel ML circuit are performed, and the results verify the theoretical analysis results.     

蔡氏电路的研究与制作

在非线性电路中蔡氏电路是迄今为止产生复杂动力学行为的最为有效和较为简单的电路之一。从软件仿真和电路制作两个角度分别对蔡氏电路的特性进行了研究,讨论蔡氏电路的工作原理,分别用PSPICE和MATLAB软件仿真出蔡氏电路的相关特性,并制作出硬件电路,给出观察蔡氏电路周期1、周期2极限环及单涡卷和双涡卷混沌吸引子的实验结果,得出了与理论分析一致的结果。对进一步研究和设计专用混沌集成电路及混沌在保密通信中的应用具有积极的意义。     

Mapping equivalent approach to analysis and realization of memristor-based dynamical circuit

A novel mapping equivalent approach is proposed in this paper, which can be used for analyzing and realizing a memristor-based dynamical circuit equivalently by a nonlinear dynamical circuit with the same topologies and circuit parameters. A memristor-based chaotic circuit and the corresponding Chua’s chaotic circuit with two output differentiators are taken as examples to illustrate this approach. Equivalent dynamical analysis and realization of the memristor-based chaotic circuit are performed by using Chua’s chaotic circuit. The results indicate that the outputs of memristor-based chaotic circuit and the corresponding outputs of Chua’s chaotic circuit have identical dynamics. The proposed approach verified by numerical simulations and experimental observations is useful in designing and analyzing memristor-based dynamical circuits.     

Chaotic memristive circuit: equivalent circuit realization and dynamical analysis

In this paper, a practical equivalent circuit of an active flux-controlled memristor characterized by smooth piecewise-quadratic nonlinearity is designed and an experimental chaotic memristive circuit is implemented. The chaotic memristive circuit has an equilibrium set and its stability is dependent on the initial state of the memristor. The initial state-dependent and the circuit parameter-dependent dynamics of the chaotic memristive circuit are investigated via phase portraits, bifurcation diagrams and Lyapunov exponents. Both experimental and simulation results validate the proposed equivalent circuit realization of the active flux-controlled memristor.     

QUANTUM FLUCTUATIONS IN A MESOSCOPIC DAMPED LC PARALLEL CIRCUIT IN DISPLACED SQUEEZED FOCK STATE

We study the quantum effects of a damped LC parallel circuit considering its different performance from an RLC series circuit in classical physics. The damped LC parallel circuit with a source is quantized and the quantum fluctuations of magnetic flux and electric charge in the circuit in displaced squeezed Fock state are investigated. It is shown that, as in the RLC series circuit, the fluctuations only depend on the squeezing parameter and the parameters of the circuit components in the damped LC parallel circuit, but the effects of the circuit components on the fluctuations are different in the two circuits.     

单相并联谐振变换器输出LC滤波器参数优化

采用在静止直角坐标系中构造虚拟正交电路的方法,推导了单相并联谐振变换器在直接正交(D-Q)旋转坐标系中的等效电路,求解了该等效电路的传递函数;通过仿真验证所推导的D-Q等效电路能够准确地代表原变换器电路。基于阻抗匹配的原则,通过D-Q等效电路的传递函数对单相并联谐振变换器的输出LC滤波器参数进行了优化,达到了输出脉冲电压上升沿时间小于50μs、过冲小于5%、调节时间小于100μs和纹波小于5%的预期指标,验证了采用该方法来优化并联谐振变换器输出LC滤波器参数的可行性。     

单相并联谐振变换器输出LC滤波器参数优化

采用在静止直角坐标系中构造虚拟正交电路的方法,推导了单相并联谐振变换器在直接正交(D-Q)旋转坐标系中的等效电路,求解了该等效电路的传递函数;通过仿真验证所推导的D-Q等效电路能够准确地代表原变换器电路。基于阻抗匹配的原则,通过D-Q等效电路的传递函数对单相并联谐振变换器的输出LC滤波器参数进行了优化,达到了输出脉冲电压上升沿时间小于50 s、过冲小于5%、调节时间小于100 s和纹波小于5%的预期指标,验证了采用该方法来优化并联谐振变换器输出LC滤波器参数的可行性。     

Dynamical characteristics of an HP memristor based on an equivalent circuit model in a chaotic oscillator

To develop real world memristor application circuits,an equivalent circuit model which imitates memductance(memory conductance) of the HP memristor is presented.The equivalent circuit can be used for breadboard experiments for various application circuit designs of memristor.Based on memductance of the realistic HP memristor and Chua's circuit a new chaotic oscillator is designed.Some basic dynamical behaviors of the oscillator,including equilibrium set,Lyapunov exponent spectrum,and bifurcations with various circuit parameters are investigated theoretically and numerically.To confirm the correction of the proposed oscillator an analog circuit is designed using the proposed equivalent circuit model of an HP memristor,and the circuit simulations and the experimental results are given.     

基于电流反馈放大器的网格多涡卷混沌电路设计与实现

提出了一种仅用电流反馈放大器实现网格多涡卷混沌系统的方法.首先用电流反馈放大器设计非线性函数电路;再用电流反馈放大器设计网格多涡卷混沌电路,根据混沌吸引子参数确定电路参数,由于电流反馈放大器具有较好的频率特性和端口特性,使该电路的工作频率高、电路结构简单、使用元件少;最后,通过电路仿真验证该方法的可行性.     

Analysis of the effect of stray capacitance on a charge/discharge-based electrical capacitance tomography system

The measurement circuit of electrical capacitance tomography (ECT) system mainly includes CMOS switches, C/V conversion circuit and Data processing circuit. In order to improve the image reconstruction quality, conversion circuit is very necessary to the small capacitance measurement circuit. A charge/discharge measurement circuit is one of the most suitable for the C/V conversion circuit in ECT. The stray capacitance between the measurement electrodes and earth can be large and have an effect on the capacitance measurement. This paper analyzes this effect, taking into account the ON-resistance of the COMS switch, the unit gain frequency of op-amp, and gain error in the measurement circuit. Finally, it is shown that if the range of stray capacitance is 150 ± 60 pF, overall error would be estimated. Comparing the effects of the circuit parameters, this charge/discharge-based capacitance is effectively stray-immune. It is a more efficient analysis to C/V circuit in ECT and offers a great benefit to information processing.