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转子-阻尼器-密封系统的运动稳定性分析

清华大学学报（自然科学版） 1998年第8期38卷 107-110页

作者：褚福磊李贵三清华大学精密仪器与机械学系辽阳石油化工专科学校化工机械系

为分析转子—阻尼器—密封系统在密封的作用下所出现的不稳定现象以及阻尼器在抑制系统不稳定中的作用，对于一个水平放置的转子模型，考虑了线性形式的密封作用力、线性阻尼器以及非线性阻尼器的作用，通过求解综合运动微分方程的特征... 详细信息

为分析转子—阻尼器—密封系统在密封的作用下所出现的不稳定现象以及阻尼器在抑制系统不稳定中的作用，对于一个水平放置的转子模型，考虑了线性形式的密封作用力、线性阻尼器以及非线性阻尼器的作用，通过求解综合运动微分方程的特征值，讨论了这类系统的运动稳定性。分析结果表明，作为一个非线性元件，阻尼器可以在系统出现失稳时为系统提供更多的阻尼，从而延缓不稳定的发生，有时可导致系统在极限环状态下运行。

关键词：稳定性围子密封阻尼器旋转机械

Characterization for the Dynamics of an Adjustable Linear Oil Damper for Advanced Rail Vehicles

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Characterization for the Dynamics of an Adjustable Linear Oi...

第十一届IFTOMM世界大会

作者： Wenlin Wang Peien Feng state key {2. of Fluid Power Transmission and Control Zhejiang university Hangzhou 31002. china

＜正＞A parametric model for the dynamics of an adjustable linear oil damper equipped in advanced rail vehicles is developed in this paper. Instantaneous leakage flows, oil compressibility, oil temperature and valve dynamics etc. are taken into account in the modelling process. A computer package based on the model is developed in MATLAB environment and numerical analyses are carried out on the damping performance by means of parameters identification. Experiments with a CAT rig are done at last and satisfied agreement is achieved between the numerical prediction and experiments.

关键词： Modeling Dynamics Adjustable linear oil damper Orifice Damping performance Parameter identification

Involvement of spinal microglia in the anti-hyperalgesic effects of gabapentin in rat model of monoarthritis

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Involvement of spinal microglia in the anti-hyperalgesic eff...

中国神经科学学会第九届全国学术会议暨第五次会员代表大会

作者： Jia-Le YANG~1,Bo XU~2.Wei-Shi ZHANG~(3*),Hua XU~2.Xiao-Ming DENG~2.Yu-Qiu ZHANG~(1,*) 1 Institute of Neurobiology,Institutes of Brain Science and state key {2. of Medical Neurobiology,Fudan university,Shanghai 2.0032.china 2.Department of Anesthesiology,Xinhua Hospital,Shanghai Jiaotong university School of Medicine,Shanghai 2.0092. china 3 Department of Anesthesiology,Changhai Hospital,The Second Military Medical university,Shanghai 2.0433,china

＜正＞This study investigated the effects of gabapentin on spinalα2.δ-l subunit of voltage-gated calcium channels （VGCCs）,fractalkine,CX3CR1 expression levels and glial activation,as well as thermal hyperalgesia evoked by monoarthritis（MA）.MA produced a robust upregulation of VGCCsα2.δ-l subunit,fractaline,CX3CR1 expression levels,and activation of microglia and astrocytes in the spinal cord,which was associated with the development of thermal *** showed thatα2.δ-1 subunit of VGCCs,a proposed action target of gabapentin,was wildly distributed in primary afferent fibers terminals and dorsal horn ***,a potential trigger to activate microglia,colocalized withα2.δ-1 subunit of VGCCs in superficial spinal cord,whereas its receptor CX3CR1 was mainly expressed in spinal ***（i.p.）gabapentin significantly downregulated spinalα2.δ-l subunit of VGCCs and fractalkine levels,suppressed microglial activation and blocked the development of thermal hyperalgesia in MA *** data suggest that gabapentin may diminish fractalkine release in the spinal cord via modulatingα2.δ-1 subunit of VGCCs,thereby leading to the reduction in spinal glial activation and thermal hyperalgesia.

关键词： fractalkine gabapentin glial activation monoarthritis thermal hyperalgesia α2.δ-1 subunit of voltagegated calcium channels(VGCCs)

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视频服务器系统中接入控制问题的研究

计算机工程与应用 2002年第23期38卷 61-64,67页

作者：顾铁成陈道蓄南京大学计算机软件新技术国家重点试验室南京大学计算机科学与技术系南京210093

在构建大规模视频服务系统时,视频服务器的性能如何非常关键,而接入控制(AdmissionControl)功能作为服务器系统直接面对用户的前端,设计得如何对视频服务器的性能、吞吐率、资源的利用率、客户感知的QoS水平等都有着极大的影响。该文围... 详细信息

在构建大规模视频服务系统时,视频服务器的性能如何非常关键,而接入控制(AdmissionControl)功能作为服务器系统直接面对用户的前端,设计得如何对视频服务器的性能、吞吐率、资源的利用率、客户感知的QoS水平等都有着极大的影响。该文围绕多媒体视频服务器中接入控制的作用与目标,对接入控制问题进行了研究,分析了影响接入控制问题和策略的一些因素,如磁盘带宽等系统资源、服务周期时长与接入控制的关系。由于统计型的接入控制策略与确定型策略相比,在提高系统的资源利用率、提高可接入的并发用户数方面,都有相当的优势。因此,该文对统计型的接入控制算法也做了较为深入的分析。

关键词：视频服务器系统接入控制多媒体 I/O带宽

Structure Characterization of Four New Acylhydrazidate-Containing Compounds

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Structure Characterization of Four New Acylhydrazidate-Conta...

中国化学会第六届全国结构化学学术会议

作者： Juan Jin~1,Ming-Jun Jia~(1,3),Jie-Hui Yu~(1,2.*) and Ji-Qing Xu~(1,2.*) 1 College of Chemistry,Jilin university,Changchun,Jilin,13002. 2.state {2. laboratory of Inorganic Synthesis and Preparative Chemistry,Jilin university, Changchun,Jilin,13002. 3 state {2. laboratory of Theoretical and Computational Chemistry,Institute of Theoretical Chemistry,Jilin university,Changchun,Jilin,13002.

Under the hydrothermal conditions,the simple reactions between the metal salts,aromatic polycarboxylic acids and NH·HO,sometimes in the presence of phenanthroline·HO(phen),some metal-acylhydrazidate coordination polymers have been ***,we will report the latest research production:[Cd(DPHKH)(phen)]·1.75HO 1,[Zn(DPHKH)(HDPHKH)(phen)]·8HO 2.

关键词：

Studies of NiO Nano/Micro Structures and Their Electrochemical Properties

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Studies of NiO Nano/Micro Structures and Their Electrochemic...

中国化学会第六届全国结构化学学术会议

作者： Huan Pang~(*,1,2.3) Jiang-Shan Zhang,~1 Hong-He Zheng~2.1 Department of Chemistry and Chemical engineering,Anyang Normal university,Anyang, 455002.Henan 2.School of Energy,Soochow university,Suzhou,2.5006,Jiangsu 3 state key laboratory of Coordination Chemistry Coordination Chemistry Institute,Nanjing university,Nanjing,2.0093,Jiangsu

＜正＞Nickel oxide nanotubes,nanowires,nanorods,porous nano-spindle,nanoflowers structure,respectively, through a precursor method and high-temperature method have been successfully *** compare nanostructured nickel o...

关键词：

Field Profiles of Nonlinear TE Waves in a Symmetric Periodic Refractive Index Structure with Two Identical Nonlinear Claddings

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Chinese Journal of Lasers 1998年第6期 44-49页

作者： MA Chunsheng (Department of Electronic engineering, state {2. laboratory on Integrated Optoelectronics, Jilin university, Changchun 13002., china)WU Hongzhu (Department of Physics, Jilin Teachers College, Jilin 132.11, china) Received Dec. 1, 1997

１ＩｎｔｒｏｄｕｃｔｉｏｎＮｏｎｌｉｎｅａｒｍｕｌｔｉｌａｙｅｒｓｔｒｕｃｔｕｒｅｓｉｎｃｌｕｄｉｎｇｎｏｎｌｉｎｅａｒｍｕｌｔｉｐｌｅｑｕａｎｔｕｍｗｅｌｓｙｓｔｅｍｓｐｏｓｅｓｓｏｍｅｄｉｓｔｉｎｃｔｉｖｅｆｅａ... 详细信息

１ＩｎｔｒｏｄｕｃｔｉｏｎＮｏｎｌｉｎｅａｒｍｕｌｔｉｌａｙｅｒｓｔｒｕｃｔｕｒｅｓｉｎｃｌｕｄｉｎｇｎｏｎｌｉｎｅａｒｍｕｌｔｉｐｌｅｑｕａｎｔｕｍｗｅｌｓｙｓｔｅｍｓｐｏｓｅｓｓｏｍｅｄｉｓｔｉｎｃｔｉｖｅｆｅａｔｕｒｅｓａｓｓｔｒｏｎｇｅｒｏｐ...

关键词： periodic refractive index nonlinear claddings field profile degeneracy

THE DESIGN OF BALANCED AMPLIFIER BASED ON COMMON-MODE FEEDBACK

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Journal of Electronics(china) 1995年第4期12卷 298-303页

作者：董炜刘阳姜黎李联 state key ASIC and System {2. Fudan University Shanghai 200433

The balanced operational amplifier including its merits and designing methods is discussed by comparing its performance to a conventional differential output amplifier when used in a single balanced stage. A balanced ... 详细信息

关键词： Operational amplifier Balanced-output structure Common-mode feedback

一种基于前馈—反馈复合控制方式的制动稳定性控制方法

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信息与控制 2005年第1期34卷 26-29,34页

作者：晏蔚光陈全世清华大学汽车安全与节能国家重点实验室北京100084

(清华大学汽车安全与节能国家重点实验室, 北京　100084)摘　要:设计了一种前馈—反馈复合控制结构,将直接横摆力矩控制和主动前轮转向控制相结合以提高制动稳定性.控制器将前轮转向角视为输入,将外部侧向干扰力和力矩作用视为扰动,通... 详细信息

(清华大学汽车安全与节能国家重点实验室, 北京　100084)摘　要:设计了一种前馈—反馈复合控制结构,将直接横摆力矩控制和主动前轮转向控制相结合以提高制动稳定性.控制器将前轮转向角视为输入,将外部侧向干扰力和力矩作用视为扰动,通过前馈校正补偿转向角引起的状态变化;同时建立扰动状态观测器,采用反馈控制校正消除外部扰动引起的状态误差.仿真试验证实这种控制方法在提高制动稳定性方面有良好的效果.*

关键词：直接横摆力矩控制主动前轮转向扰动状态观测器最优控制