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本文详细论述了动态子结构方法,并对自由界面子结构模态综合、固定界面子结构模态综合方法进行了系统分析。 相似文献
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通过对土木工程专业实验教学的研究,构建了"基础性实验、综合设计性实验、研究创新性实验"3个层次的实验教学体系,提出以实验教学与理论教学、实验室教学与工程实践、课堂实验与开放实验相统一的土木工程专业实验教学改革思路,探索新的实验教学模式. 相似文献
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北京工业大学土木工程国家级虚拟仿真实验教学中心利用现代虚拟仿真最新技术,采取多种模式建立了虚拟仿真实验平台。以土木工程中基础实验课程教学方法为研究对象,提出基于虚拟仿真技术的土木工程实验实训课程的教学方案。依托真实系统和仿真实训中心,构建了土木工程应用领域广泛使用的钢筋混凝土简支梁实验、短柱实验、振动台实验等九个实训项目,同时构建了工程结构实验中心三维仿真系统,功能包括实验中心室内、外场景的整体3D展示以及大型实验设备和特色实验系统的3D模型、功能展示和试验仿真。 相似文献
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董晓丽 《北京城市学院学报》2013,(1):16-18,23
北京城市学院土木工程专业综合改革试点项目以人才培养模式改革和创新为主题,加强教师队伍特别是实践教学教师队伍建设;加强教学内容、课程体系改革;改革教育教学方式和考核评价方法,进一步提升土木工程专业的人才培养质量,形成特色更加鲜明的专业点,引领带动北京城市学院其他专业的建设,为我国民办类高校土木工程专业的综合改革起到示范作用。 相似文献
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Xue-ping LI Wei-qiu ZHU Zu-guang YING 《浙江大学学报(A卷英文版)》2008,9(3):330-337
An optimization method for time-delayed feedback control of partially observable linear building structures subjected to seismic excitation is proposed. A time-delayed control problem of partially observable linear building structure under horizontal ground acceleration excitation is formulated and converted into that of completely observable linear structure by using separation principle. The time-delayed control forces are approximately expressed in terms of control forces without time delay. The control system is then governed by Itoe stochastic differential equations for the conditional means of system states and then transformed into those for the conditional means of modal energies by using the stochastic averaging method for quasi-Hamiltonian systems. The control law is assumed to be modal velocity feedback control with time delay and the unknown control gains are determined by the modal performance indices. A three-storey building structure is taken as example to illustrate the proposal method and the numerical results are confirmed by using Monte Carlo simulation. 相似文献
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阐述了应用型本科院校土木工程专业学生工程素质培养的重要性,分析了我校土木工程专业人才的培养目标,提出了加强实习基地建设,培养学生的工程素质,深化土木工程专业的人才培养模式改革.在实习基地建设过程中充分利用高校、企业和科研机构在人才培养上的优势,建立校内实习基地、校外实习基地,确实保证实践教学的要求.经过几年的专业建设,我们的专业人才培养模式取得了较好的成效,可供同类院校参考. 相似文献
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本文详细介绍了ANSYS软件在工程抗震设计原理教学中的应用。以一个12层混凝土框架结构为例,阐述了用ANSYS软件对其进行模态分析、谱分析和瞬态动力分析的过程和结果。利用ANSYS软件可以直观地显现结构模型及动力分析的过程和结果,加深学生对结构动力实验结果的正确理解,进而有助于理解工程抗震设计的有关原理。 相似文献
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To improve the machining precision of a surface grinding machine, a micropositioning workpiece table with high performance was used as auxiliary infeed mechanism to implement nanometer level positioning and dynamic compensation. To better understand the characteristics of the grinding machine modulated with micropositioning workpiece table, the dynamic model of the grinding system was established with modal synthesis and Lagrange's equation methods. The grinding system was divided into five subsystems. For each subsystem, the generalized kinematic and potential energies were obtained. Accordingly the dynamic model of the grinding system was given in the modal domain. The waviness of the grinding process was achieved based on the wheel and workpiece vibration. A nonlinear proportional integral derivative (PID) controller with differential trackers was developed to realize dynamic control. The simulation results show that the machining accuracy of the workpiece can be effectively improved by utilizing the micropositioning workpiece table to implement dynamic compensation. An experimental test was carried out to verify the proposed method, and the waviness of the workpiece can be reduced from 0.46 μm to 0.10 μm. 相似文献
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基于国家注册结构工程师制度的教学改革 总被引：2，自引：0，他引：2
通过分析21世纪土木工程教育发展的挑战与机遇,比较分析了国内外培养注册结构工程师的周期和学制、土木工程专业培养目标、教学计划、教学方法、实践教学等内容。介绍国家注册结构工程师执业资格制度,提出了结合工程实际的教学内容动态发展、专业教学计划改革。同时结合集美大学新办土木工程专业的具体情况,比较分析了专业培养目标、周学时数和年学时数、课程设置学时比较、面向工程实际的教学改革、结合结构设计竞赛的专业改革等方面。 相似文献
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Withthedevelopmentofeconomyandtherequire mentofmunicipalconstruction ,long spanspatialstruc turesariseinthecitiesrapidly .Furthermore ,thespansofstructuresbecomelongerandlonger ,andthestruc turalsystemsbecomemoreandmorecomplex .Atthesametime,somecomplicatedcompositeorhybridstruc tures ,suchastensegritystructure[1,2 ] ,cable membranestructure[3,4 ] ,openablestructure[5] ,stringstructure[5] ,andinflatablestructure[4 ] etc .,appearsuccessivelybyus ingthematerialsofsteel,cableandmembranesyntheti c… 相似文献
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针对国内民机系统纵向稳定性较差、飞机纵向短周期模态响应稳定性不足等问题,以某大型民机为研究对象,基于特征结构配置方法,利用逆模型的思路确定控制系统前馈增益系数,并基于某典型配平状态点,利用线性模型设计该飞机纵向控制律。线性仿真分析中,利用俯仰角速率q响应准则评价控制方案效果。仿真结果表明,采用特征结构配置方法设计的纵向飞行控制律具有良好控制效果,可以改善系统飞行品质使其达到一级飞行品质要求,相比于经典控制理论,通过特征结构配置方法进行纵向Nz控制律设计可以一次性确定反馈增益系数,缩短控制律设计时间。 相似文献
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A 9-story concrete-filled steel tubular frame model is used to analyze the response of joints due to sudden column loss. Three different models are developed and compared to study the efficiency and feasibility of simulation, which include substructure model, beam element model and solid element model. The comparison results show that the substructure model has a satisfying capability, calculation efficiency and accuracy to predict the concerned joints as well as the overall framework. Based on the substructure model and a kind of semi-rigid connection for concretefilled square hollow section steel column proposed in this paper, the nonlinear dynamic analyses are conducted by the alternate path method. It is found that the removal of the ground inner column brings high-level joint moments and comparatively low-level axial tension forces. The initial stiffness and transmitted ultimate moment of the semi-rigid connection are the main factors that influence the frame behavior, and their lower limit should be guaranteed to resist collapse. Reduced ultimate moment results in drastic displacement and axial force development, which may bring progressive collapse. The higher initial stiffness ensures that the structure has a stronger capacity to resist progressive collapse. 相似文献
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采用材料计算模拟软件构建材料的原子结构,通过计算得到材料的电子结构信息,可把抽象的能带用计算图谱形象地呈现出来。以二氧化钛为例,构建其晶体结构,通过计算,可得到二氧化钛的电子结构信息,得到直观的能带图,取代了课本中的简易能带图谱。这种教学方式,促进了学生对能带理论的理解和掌握,激发了学生对功能材料电子结构的学习兴趣。 相似文献
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目前民事上诉审中没有规定禁止不利益变更原则,以至于上诉人有可能承担上诉请求被驳回的结果。考虑到国际通行的相关立法,并考查我国目前的续审模式和诉讼利益,也分析了禁止不利益变更原则和当事人处分原则的关系和附带上诉的关系。建议在我国的民诉法当中加入禁止不利益变更原则。 相似文献
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For the dynamic demand assessment of bridge structures under ship impact loading, it may be prudent to adopt analytical models
which permit rapid analysis with reasonable accuracy. Herein, a nonlinear dynamic macro-element is proposed and implemented
to quantify the demand of bridge substructures subjected to ship collisions. In the proposed nonlinear macro-element, a combination
of an elastic-plastic spring and a dashpot in parallel is employed to describe the mechanical behavior of ship-bows with strain
rate effects. Based on the analytical model using the proposed macro-element, a typical substructure under 5000 deadweight
tonnage (DWT) ship collision is discussed. Our analyses indicate that the responses of the structure using the nonlinear macro-element
agree with the results from the high resolution model, but the efficiency and feasibility of the proposed method increase
significantly in practical applications. Furthermore, comparisons between some current design codes (AASHTO, JTGD60-2004,
and TB10002.1-2005) and the developed dynamic analysis method suggest that these design codes may be improved, at least to
consider the effect of dynamic amplification on structural demand. 相似文献
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获取机床结构的动态特性是确保精密加工的重要手段之一.基于有限元分析软件ANSYS Workbench 12.0,在Pro/E软件中建立机床主轴、主轴箱三维模型,进而将其导入ANSYS Workbench 12.0中进行有限元建模和模态分析,获得了固有频率和振型;在此基础上,分析了振型图中的最大变形区域,评价了共振薄弱点并提出了相应的结构修改建议. 相似文献
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国际私法上的“意思自治”原则与民主法上的“意思自治”有着很大的区别 ,不能简单地将其价值追求归结为追求个人自由与尊重当事人意志 ,其更大的价值在于能更好地维护国际交往利益 ,因而不似民法上的“意思自治”那样与国内经济及政治思想的自由共兴衰 ,它的产生、发展与兴衰更多地反映的是国际交往利益的需要 ,那么 ,其能在民法上的意思自治走向衰落时在国际私法领域拓展出更大的空间 相似文献
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Yu Lianhong 《大连大学学报》1994,(4)
本文简述了有限单元法的基本原理,特点,及对解决土工问题的重要性,重点论述了有限单元法解土中非线性问题即应力—应变课题的三种方法—增量法,迭代法,混合法,最后总结了用有限单元法解土工问题的几个重点步骤。 相似文献