Virtual Experimental Project Design in the Digital Signal Processing Course

This paper proposes the design and development of virtual experimental projects in the Digital Signal Processing course,using MATLAB,Proteus,and CCS platforms to develop a library of typical experimental cases for biomedical engineering majors and discusses the design process.Based on these typical cases,this paper explores the secondary design for innovative engineering practice case teaching,which can promote students’understanding and mastery of digital signal processing theories,algorithms,and technologies in an intuitive,flexible,and efficient way;quickly build new innovative engineering case models and further cultivate students’engineering application ability as well as innovative thinking.

基于Simulink的Chua’s Circuit混沌实验的可视化模型及仿真研究

以大学物理实验中的Chua’s Circuit混沌实验为例，提出了运用Simulink建立Chua’s Circuit混沌实验可视化模型的方法，并对混沌系统的几种状态进行仿真研究。

电子电路课程EveryCircuit仿真辅助教学设计与实践

针对电子电路课程理论性和实践性强的特点,提出了将手机App EveryCircuit仿真应用于电子电路课程教学,给出了依据不同内容和不同需求而采取的教学演示、仿真研究、仿真设计等教学设计和教学实例,并应用于教学实践。结果表明,学生学习兴趣明显提升,教学效果显著。

Circuit Wizard在电子技术线上教学中的应用

Circuit Wizard仿真软件被引入电子技术线上教学,有助于学生理解晦涩难懂的电路理论,同时解决线上教学不具备实验设备的难题,为学生线下预习和复习提供便利。其形象逼真的组件库和仿真功能,为提升学生实践能力保驾护航,从而提高教学效率和教学质量。此外,Circuit Wizard软件也适用于辅助电子技术线下的教学和学习。

Realization of fractional-order Liu chaotic system by circuit

In this paper, chaotic behaviours in the fractional-order Liu system are studied. Based on the approximation theory of fractional-order operator, circuits are designed to simulate the fractional- order Liu system with q=0.1 - 0.9 in a step of 0.1, and an experiment has demonstrated the 2.7-order Liu system. The simulation results prove that the chaos exists indeed in the fractional-order Liu system with an order as low as 0.3. The experimental results prove that the fractional-order chaotic system can be realized by using hardware devices, which lays the foundation for its practical applications.

Study on the Mathematical Model of Dielectric Recovery Characteristics in High Voltage SF6 Circuit Breaker

According to the stream theory, this paper proposes a mathematical model of the dielectric recovery characteristic based on the two-temperature ionization equilibrium equation. Taking the dynamic variation of charged particle＇s ionization and attachment into account, this model can be used in collaboration with the Coulomb collision model, which gives the relationship of the heavy particle temperature and electron temperature to calculate the electron density and temperature under different pressure and electric field conditions, so as to deliver the breakdown electric field strength under different pressure conditions. Meanwhile an experiment loop of the circuit breaker has been built to measure the breakdown voltage. It is shown that calculated results are in conformity with experiment results on the whole while results based on the stream criterion are larger than experiment results. This indicates that the mathematical model proposed here is more accurate for calculating the dielectric recovery characteristic, it is derived from the stream model with some improvement and refinement and has great significance for increasing the simulation accuracy of circuit breaker＇s interruption characteristic.

Closed circle DNA algorithm of change positive-weighted Hamilton circuit problem

Chain length of closed circle DNA is equal. The same closed circle DNA＇s position corresponds to different recognition sequence, and the same recognition sequence corresponds to different foreign DNA segment, so closed circle DNA computing model is generalized. For change positive-weighted Hamilton circuit problem, closed circle DNA algorithm is put forward. First, three groups of DNA encoding are encoded for all arcs, and deck groups are designed for all vertices. All possible solutions are composed. Then, the feasible solutions are filtered out by using group detect experiment, and the optimization solutions are obtained by using group insert experiment and electrophoresis experiment. Finally, all optimization solutions are found by using detect experiment. Complexity of algorithm is concluded and validity of DNA algorithm is explained by an example. Three dominances of the closed circle DNA algorithm are analyzed, and characteristics and dominances of group delete experiment are discussed.

A fractional order hyperchaotic system derived from a Liu system and its circuit realization

In this paper we propose a novel four-dimensional fractional order hyperchaotic system derived from a Liu system.Electronics workbench（EWB） and Matlab simulations show the dynamical behavior of the proposed four-dimensional fractional order hyperchaotic system.Finally,after separately using EWB and Matlab,an electronic circuit is designed to realize the novel four-dimensional fractional order hyperchaotic system and the experimental circuit results are obtained which are identical to software simulations.

Threshold flux-controlled memristor model and its equivalent circuit implementation

Modeling a memristor is an effective way to explore the memristor properties due to the fact that the memristor devices are still not commercially available for common researchers. In this paper, a physical memristive device is assumed to exist whose ionic drift direction is perpendicular to the direction of the applied voltage, upon which, corresponding to the HP charge-controlled memristor model, a novel threshold flux-controlled memristor model with a window function is proposed. The fingerprints of the proposed model are analyzed. Especially, a practical equivalent circuit of the proposed model is realized, from which the corresponding experimental fingerprints are captured. The equivalent circuit of the threshold memristor model is appropriate for various memristors based breadboard experiments.

Realization of fractional-order Liu chaotic system by a new circuit unit

A new circuit unit for the analysis and the synthesis of the chaotic behaviours in a fractional-order Liu system is proposed in this paper. Based on the approximation theory of fractional-order operator, an electronic circuit is designed to describe the dynamic behaviours of the fractional-order Liu system with α = 0.9. The results between simulation and experiment are in good agreement with each other, thereby proving that the chaos exists indeed in the fractional-order Liu system.

Circuit realization of the fractional-order unified chaotic system

This paper studies the chaotic behaviours of the fractional-order unified chaotic system. Based on the approximation method in frequency domain, it proposes an electronic circuit model of tree shape to realize the fractional-order operator. According to the tree shape model, an electronic circuit is designed to realize the 2.7-order unified chaotic system. Numerical simulations and circuit experiments have verified the existence of chaos in the fraction-order unified system.

模拟集成电路设计课程实验项目驱动式教学改革

基于高校模拟集成电路设计课程实验项目分散且教学目标不明确,缺乏系统性和工程应用性,提出了项目驱动式教学改革。以与企业合作的工程项目为基础设立实验项目,并分解成由易及难的多个实验题目,分阶段、分步骤完成实验内容,最终完成模拟集成电路设计全流程实验,以“带隙基准电压源芯片全定制设计实验”为例阐述了实施步骤。课程实验项目采用驱动式教学加深了学生对课程内容的理解,有助于培养学生扎实的工程实践能力。

新工科背景下通信电子线路基础实验课程改革探索

针对目前通信电子线路实验内容设置单一、教学手段不够丰富、教学效果不够理想等问题,提出了以任务为主线、以教师为主导、以学生为主体的实验模式,并融入联想、启发、任务驱动、项目类比等多种教学方法。以高稳定度LC正弦波振荡器的设计为例,设计了“基本”“进阶”“扩展”3种实验任务与内容,以多样化“套餐”满足学生对于实验的不同需求;在一块电路板上实现克拉泼、西勒和并联型晶体振荡器电路,使学生更容易掌握3种电路的区别与联系;采用了项目类比教学法,通过本实验使学生掌握解决典型通信工程问题的流程与科学方法;任务引入与思政环节巧妙结合,树立学生科学兴国的意识,增强民族自豪感。

面向工程教育认证的电子测量与电子电路实验课程教学改革研究

电子测量与电子电路实验是一门实践性非常强的课程。为保证毕业生质量,面向工程教育认证,适应新时代人才需求类型的变化,充分贯彻以学生为中心的理念,针对电子测量与电子电路实验课程分别从教学目标、课程内容、教学模式和考核评价系统几个方面进行研究改革,建立多元化、新时代的教学改革方案,注重学生全方面能力的培养。实践证明改革对提升该课程的教学质量有明显的效果。

数字电路在线实物实验平台建设与教学

围绕如何突破实验教学时空限制,以及满足高阶性数字电路实验教学需要,建设了数字电路在线实物实验教学平台。依托平台打造了线上线下相融合的实验模式,开发了系列在线实验教学项目,以DDS信号发生器设计为例介绍在线实物实验教学设计和实验特色;基于平台开发的实验项目已在国内多所高校推广使用,为同类课程信息化建设与教学改革提供了可借鉴的经验。

高频电路实验教学和考核评价方式探讨

为提升高频电路实验的教学效果,设计了多个高频电路实验教学案例,指明了这些电路在实验过程中需要分析的问题,以及教师在教学过程中对学生做的引导和启发,为“高频电子线路”实验教学的开设提供了有益的参考。为更好地评价高效学生在“高频电子线路实验”课程教学过程中的实践效果,设计了多维度、全过程的考核评价方案,跟传统的单一评价方式相比,该评价方案更科学、更全面。

基于开源EDA工具的电路实验课程教学

EDA工具的应用和掌握是电子线路实验课程的重要内容,当前国内相关课程建设多基于国外商用软件。考虑到商用EDA软件的局限性,借鉴开源软件在其他理工科课程教学、开源EDA工具在国外电子类课程教学的应用情况,根据模拟、数字电子线路实验内容,选取了适当的开源EDA工具,进行了课程适配。从两个学年的教学实践看,开源EDA工具可以在电路实验教学中替代商用软件,其开放性有助于激发学生的学习兴趣。

基于数字孪生的液压回路虚拟实验系统

基于智能制造过程中数字孪生技术的应用及新工科人才培养数字孪生实践锻炼需求,探索了沉浸式液压回路虚拟实验数字孪生技术在工程教育中的应用。开发了基于数字学生的液压回路数字孪生系统,通过创建物理实体的精确虚拟孪生模型,并实时同步数据,为学习者提供了一个安全、可控且高度互动的学习环境。系统架构整合了物理实体、数据连接映射与孪生模型,实现了节流调速回路的实时数据采集、存储与三维可视化。通过该实验系统进行实验教学,不仅提升了教学效率,还增强了学生对新工科数字孪生技术的理解,并为学习者提供了全新的学习视角和工具。在提高对液压回路原理理解的同时,锻炼了学生解决实际工程问题的能力,为工程教育的创新与进步提供了新的思路和方法。

基于机-电-磁-流整体耦合的油阻尼断路器保护特性的容差设计

油阻尼断路器的主要特点是在电路发生短路、过载等情况时能够自动脱扣,断开电路,从而保护人员和设备的安全,常用于变电站等场所。文章在以往对油阻尼断路器油阻尼力、电磁铁静态特性、操作机构性能等研究的基础上,构建一个基于机-电-磁-流多体多自由度多场耦合的一体化虚拟样机整体耦合模型;接着对该整体耦合模型的保护特性进行了仿真与分析,通过仿真得到了不同电流倍数下动触头的分断特性,并通过实验验证了整体耦合模型和仿真结果的正确性;最后,为减小产品保护特性的分散程度,提高油阻尼断路器的稳定性,文中结合稳健容差设计技术,选取不同电流倍数下触头的断开时间作为目标函数,以极靴半径、细铁芯半径、粗铁芯半径、粗铁芯高度作为关键设计参数,通过正交试验和贡献率分析法对目标函数进行容差分配,使得触头断开时间的分散度比原来减少39.165%。研究成果将会对电器产品的研发提供理论指导。

贯穿实验过程的电路实验考核评价方法

线上线下协同的多时间尺度实践教学是提高学生实践能动性和工程创新能力的有效措施。基于电路实验线上线下协同多维度、多时间尺度的实验教学内容和多空间、多时间尺度的教学模式,以学生实践能力和综合素质培养为目标,合理设计贯穿每个实验过程的多维度实验考核评价内容,提炼每个实验项目的课前-课中-课后的考核评价指标和量化各项指标的梯度权重,提出贯穿实验过程的电路实验考核评价方法,全面、科学地评价学生该门课程的综合成绩。该考核评价方法推动了电路实验教学的改革,提高了教与学的质量和效率,培养了学生的创新能力。