以成果导向教育理念为基础,针对当前液压与气压传动理论课程存在的诸多问题,结合机械设计制造及其自动化专业人才培养方案,确定了课程目标、建构了课程目标评价及持续改进体系.教学改革实施以来,学生的实践动手能力得到很大提升,团队协作意识不断加强,创新能力不断提高.该研究的实施也为其它课程教学改革提供参考和借鉴.
电子信息技术的飞速发展催生了很多包含众多组件的复杂系统,故障诊断技术致力于及时、准确地检测这些系统中的故障,从而为快速恢复系统功能提供重要支撑.基于Petri网数学模型提出分散式的故障诊断方法,分别针对分散式架构中的诊断站点和协调者设计故障诊断算法,并提出相应的诊断协议.站点诊断算法基于Petri网基础标识和基础向量构建,避免穷举所有与观测序列一致的变迁序列,有效提高诊断效率.提出的分散式诊断方法比传统的集中式方法具有更高的计算效率和更好的稳定性.相对于其他已存在的分散式方法,该方法具有更小的Petri网结构假设限制和更广的适用范围.
智能配电网无线传感器通信网络中,IEEE802.15.4协议采用M/M/1/k排队理论,通信数据遵循先到先发,无法为实时性和可靠性需求较高的电力数据分配合理的带宽资源.通过设置通信规则,解决节点内不同优先级别数据排队问题.以通信延时和误码率作为约束条件、网络带宽利用率最大化为系统目标函数,建立了多优先级别数据带宽资源的预测模型.通信网络根据带宽预测结果进行下一时刻不同优先级别数据带宽资源分配.最后,对基于40个智能配电网无线传感器节点的通信网络性能进行方案测试,验证了所提带宽资源分配方案的有效性.
在培养大国工匠和制造业强国的过程中,工程伦理和工匠精神的培育有助于工程技术人才的可持续发展.沿着文献梳理、理论构建、现状分析、个案研究、对策探讨的研究思路,分析了工程伦理和工匠精神在新工科背景下工程技术人才成长过程中的重要意义,查阅以往专家的研究成果、分析其研究的成果、与同行和工程技术人才沟通对话等方法将有助于研究工作的开展.在具体研究过程中,需要明确新工科建设、工程技术人才、工程伦理和工匠精神的含义.理清工程伦理和工匠精神的特点及其在人才培养中的优势,深入剖析其有效做法,总结借鉴有益经验,提出适用于河南省地方院校在新工科背景下工程技术人才工程伦理和工匠精神培育模式改进建议.
为适应新形势下电力行业对电气工程专业毕业生的能力要求和响应教育部开展新工科研究与实践以及深化工程教育改革的倡议,结合我校科学转型发展实际,以兼顾教学与科研并举为出发点,树立以培养学生工程技术综合能力为核心的理念,构建能够真实反映微电网系统原型的微电网动模实验平台,在优化、重组教学内容基础上充分发挥资源优势开展新工科建设和深化工程教育改革,促进光伏发电、微电网等课程实践教学质量持续提升.
针对汽车传动轴重要零部件——端面齿突缘叉,分析了其在锻造生产过程中存在的飞边大、材料利用率低、产品成本高等问题和不足,提出一种改进后的端面齿突缘叉的锻造工艺.改进后的锻造工艺采用Deform-3D软件模拟端面突缘叉的锻造过程;针对突缘叉的锻造模具结构,采用组合式制坯模结构,下模不固定,方便更换;预锻叉朝上,并设计定位台阶,从而保证了坯料与型腔位置的对称性;采用可调节式限位块结构,保证了模具与限位块高度相匹配.采用改进后锻造工艺进行产品试制,结果表明,生产出的端面齿突缘叉锻件不仅可以满足力学性能要求,而且材料利用率提高到90%以上,生产效率提高10%~15%.
面对过程控制领域面临的技术课题和过程控制本身应用性很强的特点,提出构建工业过程先进控制综合实践平台,给出了平台建设规划和具体运作思路.构建的过程控制平台功能全面,涵盖过程建模及仿真、控制系统结构设计、控制策略分析、网络化控制系统研究等功能.在实践平台运作上,注重实践和理论课衔接,实现有序开展,注重教学科研互动,保证实践平台的可持续发展.以过程控制课程的开展为案列,论证了平台在教学、科研等方面的积极作用.
为了提高农业大棚的生产与管理效率,设计了一种基于PLC和组态王的智能灌溉系统。由触摸屏和组态王软件组成上位机,对大棚的温度及土壤湿度进行监控;由西门子S7-200系列PLC组成下位机。通过实时检测的温度及土壤湿度参数,控制相应执行机构的动作,实现大棚灌溉的智能化。
A free-floating space redundant robotic manipulator dynamics model is established and the dynamics equation is derived, the delayed feedback control time and the self-adaptive gain coefficient are obtained by substituting into delayed feedback control equations. Then simulated dynamics control chaotic motion of the space redundant robotic manipulator, the simulation results show that the chaotic motion of the space redundant robotic manipulator becomes the periodic motion by dynamics control, therefore it is effective that dynamics control as the space redundant robotic manipulator chaotic motion control.
Effective decoding of the source signal is a key to improve Brain-computer interfaces (BCI) performances. Two groups of motor imagery (MI) data based on electroencephalograms (EEG) and electrocorticograms (ECoG) which provided by International Brain-Computer Interface Competition organization are analyzed, and concluded that ECoG signals processing is more suitable for model-driven approaches. Temporal-frequency features were extracted by model-driven method instead of data-driven method and compared, and classified by support vector machine (SVM). The results show 6 % improvement of motor imagery experiment classification accuracy on ECoG data, compared with of data-driven method.
Faced with traditional teaching process for Power Electronics was highlight on theoretical teaching and main circuit but ignore experimental teaching and control circuit analysis,so the students have low innovation consciousness and poor innovation ability.The necessity of introducing simulation and expanding the innovative awareness is analyzed,the simulation software of PLECS is introduced into Power Electronics teaching and applied into chopper circuit,the teaching practice shows the method is flexible,can strengthen the understanding of control technique in Power Electronics and improve students' initiative in learning and enhance the innovation consciousness.
The mathematical models and friction model of the flight simulator servo system was analyzed and the switching function and sliding mode control was proposed.The simulation shows the sliding mode controller with good control performance and with friction compensated effectively.
Mobile robot is a complex automation system which combines environment sense,dynami-cal plan with motion control and performance,whichrequirement for the dynamical and static characteristics ofmobile robot become higher.As for iterative learning control is an advanced control strategy which can re-alize repetitive control and anti-disturbance,tracking the trajectory with high precision independent ofac-curate mathematical models for it's control.Thus a dynamic model of mobile robot is established and itera-tive learning control strategy is applied to this repeat motion plant to finish thedesignof the control struc-tureof iterative learing and control laws.The simulation shows the iterative learning control system is stable and tracking control is realized.
The step ladder type experiment teaching method,which is combined with basic theoretical teaching,software simulation,hardware experiment,field test and design with information integration,was proposed based on power electronics to handle with traditional teaching in application-oriented universities.By using this method in teaching of power electronics,it is concluded that this method is effective and can be applied into relevant courses.
The mathematical model of the electro-hydraulic servo system was analyzed and the neural sliding mode controller was designed,the control law of sliding mode control was based on linearization feedback techniques and estimate parameters with RBF neural network.The simulation shows the sliding mode controller with good control performance of reduces chattering and parameters estimation.
Faced with traditional teaching process for power electronics,which was highlighted on main circuit but ignored control circuit analysis,the simulation software of PLECS was introduced into power electronics teaching and applied into Buck chopper circuit.The teaching practice shows the method is flexible and can strengthen the understanding of control technique in power electronics.
An instructive exploration about experiment team creation and experiment module decomposition was proposed by integration to realize comprehensive experiment.The example of two-tank level control system was taken to analyze the method,also the method was evaluated.It is concluded that it can improve the scientific research method,practical ability,thinking ability,innovative spirit,engineering awareness and competitiveness increased.
The kinematics models of mobile welding robots was analyzed and then the switching function and sliding mode control are realized,By Lyapnouv theory the stability was proved.The simulation shows the sliding mode controller with good control performance and chattering reduction for uncertain nonlinear system.
In the cultivation of automation specialist,the requirement for students' science research method,practical ability,thinking ability,creative spirit,engineering awareness and competitiveness increases.With optimal arrangement of practical courses,configuration hardware and software experimental resource,also with experimental team creation and experimental module decomposition the comprehensive experiment was realized.An example of two tank level control system was taken to analyze the method and it is concluded that this method is an instructive exploration for automation specialist to be developed into comprehensive,cooperation,innovation and engineering type talents.
对"自动控制原理"课程实行双语教学的模式进行了探讨,给出了开展教学及巩固教学成果的具体实施方案,分析了当前面临的问题并给出具体解决方案,对工科专业开展双语教学具有一定的积极意义。