共查询到20条相似文献，搜索用时 281 毫秒
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《武汉工程职业技术学院学报》2017,(1)
通过建立先导式电液比例减压阀的数学模型和Simulink模型,通过对Simulink模型施加正弦扫频信号,获得系统的频率特性,并采用加权最小二乘曲线拟合法对系统进行辨识,给出了出系统数学模型的辨识参数,将系统的辨识模型与Simulink模型进行了对比仿真,验证了辨识模型的准确性,为以后比例减压阀的控制提供合适的系统描述。 相似文献
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贺永宜 《天津工程师范学院学报》1989,(1)
本文用描述函数法,对具有饱和死区非线性的控制系统进行稳定性分析。 由饱和——死区非线性数学模型的建立,即推导求其描述函数,进而分析其系统的稳定性。探讨要使具有饱和——死区非线性环节的系统稳定,可采取的校正方法。以便工程实践中根据以上分析,确定系统有效的校正方案。 控制系统中具有饱和——死区非线性环节,构成了非线性系统。分析其系统的稳定性,采用描述函数方法。描述函数分析法是线性系统频率响应分析方法的推广,它运用等效近似的方法,将非线性环节的特性线性化,用频率法中的某些结论和方法来研究和分析非线性系统的稳定性问题。因此,关键在于求出其非线性环节的数学模型——描述函数N,相应得出其基准描速函数的负倒数特性-1/N,在复平面中根据系统中线性部分G(jω)幅相曲线与-1/N参考线的关系分析系统稳定性。 相似文献
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在纯数学的研究发展进程中,每一种正确理论的提出总可以在自然界中找到研究的依据。数学作为自然科学中的基础学科,为其它自然科学和工程科学提供了研究的方法和手段,其工具的作用在自动控制理论中也得到充分的体现。对于一个自动控制系统的分析、设计,总是由各元件与环节的物理性能来体现整个系统的基本性能,并将其基本性能建立为数学表达式、框图、坐标图等形式的数学模型。控制系统的数学模型是对系统性能的抽象,也是研究系统的依据。根据不同的数学分析方法,可以建立不同形式的数学模型;针对不同的数学模型,即可采取不同的分析方法。系… 相似文献
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陈明霞 《职教通讯(江苏技术师范学院学报)》2003,9(4)
对基于网络的远程考试系统进行了分析,对系统功能和特点进行了描述,对系统体系结构和数据库结构进行了设计,给出了本系统开发和运行环境,对部分子模块的实现进行了描述. 相似文献
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龙大鹏 《河北能源职业技术学院学报》2021,21(1)
通过分析我国现有矿山供电防误识别管理系统的基本现状,对于防误识别跟踪智能管理系统进行了总体介绍,同时对系统的构建、系统组成做了系统描述,也对应用系统建立后产生的实际实施效果做了简单地总结描述。 相似文献
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本文对易变质多物品库存系统提出了两种订购策略,以系统平均费用最少为目标建立数学模型,在一定条件下给出其最优解。最后通过数值列子比较两种策略的优劣,对系统订购周期和平均成本进行了数值分析。 相似文献
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介绍了直流单回路调速系统的设计方法,建立了有静差与无静差调速系统的数学模型,并用Matlab对系统性能进行了仿真分析.结果表明,采用PI调节器的无静差调速系统的动态与稳态性能得到了明显改善. 相似文献
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华珏 《河北软件职业技术学院学报》2007,9(2):71-74
在电路分析中经常会遇到一些阻尼振荡电路,由于这类电路在高压断路器开断能力测试、受控热核研究等许多重要的工程领域有着极为广泛的应用,因此有必要对此类电路的特性加以讨论,研究.本文首先介绍了建立数学模型的方法,然后利用了时域中传统的微分方程法和频域中经典的拉普拉斯变换法对电路进行分析.最后借助于MATLAB软件来对一类RLC电路的过渡过程进行仿真分析,并对其产生的误差作出了一定的解释. 相似文献
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龚江泳 《荆门职业技术学院学报》2009,24(5):73-76
随着课程改革的深入开展,在建立新型体育课程的同时,更需要建立一套科学的课程体系评价方法。文章应用模糊数学理论对高校新体育课程体系进行科学评价提供依据,为逐步完善普通高校体育课程建设、推动高校体育课程的改革提供参考。 相似文献
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Stefan Hrastinski Anneli Edman Fredrik Andersson Tanvir Kawnine Carol-Ann Soames 《Interactive Learning Environments》2013,21(1):84-96
The aim of this study is to describe and explore how instant messaging (IM) can be used to support informal math coaching. We have studied two projects where university students use IM to coach K-12 students in mathematics. The coaches were interviewed with a focus on how informal coaching works by examining coaching challenges, how coaching can be organized, whether coaching should be anonymous or personal, which tools can be used and how informal math coaching supports learning. Research shows that generating and answering questions are important in the process of understanding and learning, which means that both the students and the coaches can learn math through this type of project. The coaches perceive informal math coaching as complementing online math forums. For students to learn effectively, the coaches need to be able to interpret the students' competence level in order to coach on a level that is within their development zone. It seems particularly challenging to coach at the right level when using IM and, therefore, it is important to establish a personal relationship with the students. 相似文献
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对当前高校人事管理创新的思考 总被引：11，自引：0，他引：11
人事管理工作是高等学校行政管理工作体系中的重要一环,人事管理绩效是决定能否建立一支富有创新精神的高素质师资队伍的关键因素。目前很多高校在人事管理上表现出业务单纯,墨守成规,缺少开拓创新,难以营造有利于高素质教学、科研人才脱颖而出的适宜环境,促进高等教育事业持续、健康、跨越式发展。本文就高校人事管理在观念、制度上创新的必要性进行分析,对提高人事管理者自身素质进行思考,并初步提出如何进行创新的思路。 相似文献
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《British journal of educational technology : journal of the Council for Educational Technology》2018,49(3):398-411
The purpose of this article is to describe the current state of knowledge and practice in the flipped learning approach in engineering education and to provide guidance for practitioners by critically appraising and summarizing existing research. This article is a qualitative synthesis of quantitative and qualitative research investigating the flipped learning approach in engineering education. Systematic review was adopted as the research methodology and article selection and screening process are described. Articles published between 2000 and May 2015 were reviewed, and 62 articles were included for a detailed analysis and synthesis. The results indicated that flipped learning gained popularity amongst engineering educators after 2012. The review revealed that research in engineering education focused on documenting the design and development process and sharing preliminary findings and student feedback. Future research examining different facets of a flipped learning implementation, framed around sound theoretical frameworks and evaluation methods, is still needed to establish the pedagogy of flipped learning in teaching engineering. 相似文献
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针对当前民办教育所面临的严峻挑战,政府要实现依法、有效监管,推动民办教育健康、快速、持续发展,必须以宽容的心态、前瞻性的观念,树立监管意识,实施主动监管;创新监管方式,完善监管制度,严把准入,加强日常监管,完善退出机制;加强监管力量,建立协调机制,建立行政执法责任制,落实监管责任. 相似文献
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Teacher pedagogical beliefs: The final frontier in our quest for technology integration? 总被引：12，自引：0，他引：12
Although the conditions for successful technology integration finally appear to be in place, including ready access to technology,
increased training for teachers, and a favorable policy environment, high-level technology use is still surprisingly low.
This suggests that additional barriers, specifically related to teachers' pedagogical beliefs, may be at work. Previous researchers
have noted the influence of teachers' beliefs on classroom instruction specifically in math, reading, and science, yet little
research has been done to establish a similar link to teachers' classroom uses of technology. In this article, I argue for
the importance of such research and present a conceptual overview of teacher pedagogial beliefs as a vital first step. After
defining and describing the nature of teacher beliefs, including how they are likely to impact teachers' classroom practice
I describe important implications for teacher professional development and offer suggestions for future research. 相似文献
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关于数学教师课程知识来源 总被引：1，自引：0，他引：1
数学课程知识包括教材知识和资源知识,数学教师获得课程知识存在7种方法与途径,分别是:作为学生时代的经验;职前培训;在职培训;有组织的教研活动;同事之间的交流;阅读参考文献;自身的教学经验积累与反思. 相似文献
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创建一流经济与管理实验教学基地 总被引：1，自引：0，他引：1
结合武汉大学经济与管理实验教学中心的建设实践,研究了如何创建一流实验教学基地的建设方案,包括建立先进的实验教学理念、先进的实验教学体系和先进的实验教学方法,并提出了如何建立先进的运行机制和管理方式,如何加强实验教学队伍建设,构建合理的实验教学队伍。 相似文献
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Rajat Arora 《Performance Improvement》2016,55(1):23-35
This article describes a performance improvement project undertaken in the manufacturing unit of a multinational company in India that specializes in the business of engineering, procurement, and construction (EPC). The article includes a brief introduction to the company's business (leaving out the name of the company due to a clause of confidentiality). The objective of the article is to describe a set of performance problems and how various performance theories, models, and tools were used to identify root causes and to implement design solutions for improvement. The article describes how the author as an internal consultant employed various consulting principles to establish a strong platform of understanding and to build a partnership with the clients. In addition, the different stages used in analyzing the problem, applying performance models, and designing solutions are presented. The article concludes with the author's sharing his personal experiences and the feedback he received from project stakeholders. 相似文献