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斗轮挖掘机回转支承上部结构中关键部件的静态稳定性基本参数、负载和强度研究（英文）

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2016年第5期17卷 353-365页

作者： Srdan M.BOSNJAK Nebojsa B.GNJATOVIC Sreten D.SAVICEVIC Milorad P.PANTELIC ivan lj.milenovic Faculty of Mechanical Engineering University of Belgrade Belgrade 11120 Serbia Faculty of Mechanical Engineering University of Montenegro Podgorica 81000 Montenegro Faculty of Technical Sciences University of Kragujevac Cacak 32000 Serbia

目的：斗轮挖掘机回转支承上部结构的重量和重心位置不仅在设计过程中非常重要,在斗轮挖掘机组装完成后和运转时同样重要。本文旨在研究各参数对重心位置的影响。方法：1.分析比较由数值模拟和实验得到的静态稳定性基本参数;2.构建上部... 详细信息

目的：斗轮挖掘机回转支承上部结构的重量和重心位置不仅在设计过程中非常重要,在斗轮挖掘机组装完成后和运转时同样重要。本文旨在研究各参数对重心位置的影响。方法：1.分析比较由数值模拟和实验得到的静态稳定性基本参数;2.构建上部结构的3D模型（图1-3）,并根据斗轮挖掘机组装完成后的重量分布对模型进行质量修正;3.对上部结构进行负载和应力分析。结论：1.上部结构一个较小的质量变化（1.5%）会导致重心位置一个较大的变化（902 mm）,从而不得不明显增加配重的重量（24 t）来保持平衡;2.构建的3D模型可以得到精确的上部结构重量分布和重心位置;3.由DIN 22261-2标准规定的眼板应力被证明并不安全。

关键词：斗轮挖掘机回转支承上部结构静态稳定性参数负载强度

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Transcatheter Ventricular Septal Defect Closure with Nit-Occlud LêVSD Device—Five Years’Experience and Literature Review

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Congenital Heart Disease 2023年第3期18卷 361-371页

作者： ivana B.Cerović Vladislav A.Vukomanović Jovan lj.Košutić Mila S.Stajević Sanja S.Ninić Saša S.Popović ivan D.Dizdarević Staša D.Krasić Sergej M.Prijić Cardiology Department Mother and Child Health Institute of Serbia“Dr VukanČupić”Belgrade11070Serbia Faculty of Medicine University of BelgradeBelgrade11070Serbia

Introduction:Transcatheter closure is an alternative to ventricular septal defect(VSD)occlusion ***-Occlud LêVSD coil is a new device yet to be *** study aimed to evaluate immediate and midterm results after transcatheter closure with the Nit-Occlud LêVSD ***:The retrospective analysis included 30 patients with VSD referred for closure during the period from October 2015 to December ***:At the time of intervention,the patients’mean age and body weights were 7.5±5.6 years and 29.3±19.1 *** majority of the defects had perimembranous location(24/30),four defects had muscular and two outlet subaortic *** mean effective right-side diameter of the VSDs was 3.6±1.3 *** ventricular fibrillation,device embolization,and hemolysis developed in different patients and were successfully *** of the patients had a complete atrioventricular *** coil was successfully placed in 25/30(83.3%)*** majority of the devices were 10 mm×6 mm(11/25)and 12 mm×8 mm(8/25)in *** patients required the implantation of a second *** follow-up period was 2.1±1.4 *** VSD closure was achieved in 48%of cases immediately after the intervention,74%during 2.1±1.6 months after the procedure,and 81%over *** remaining patients had a trivial residual *** the follow-up,approximately one-third of patients developed trivial aortic and mitral valve regurgitation,and half of the patients acquired trace/mild tricuspid ***(z-score)left ventricular end-diastolic diameter(0.15±0.37 vs.0.92±0.82,p=0.005)and left atrium dimension(0.47±0.58 vs.1.89±1.11,p=0.005),as well as the left atrium to aortic root ratio(1.2±0.1 vs.1.4±0.2,p=0.005)showed a significant decrease over follow-up related to the period before ***:Intervention with Nit-OccludLêVSD coil showed appropriate results regarding VSD closure rate,complications,and chamber *** introduction of t

关键词： Ventricular septal defect transcatheter device children

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A New Approach to the Stability of Discrete Descriptor Time Delay Systems in the sense of Non-Lyapunov Delay Independent Conditions

A New Approach to the Stability of Discrete Descriptor Time ...

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第24届中国控制与决策会议

作者： Dragutin lj. Debeljkovic ivan M. Buzurovic Tamara Nestorovic Dejan Popov Faculty of Mechanical Eng. University of BelgradeSerbia Thomas Jefferson University Medical Physics DivisionPhiladelphia PA USA Ruhr-University of Bochum Dept. Mechanics of Adaptive SystemsGermany

This paper gives sufficient conditions for the practical and finite time stability of linear singular continuous time delay systems of the form 1 Ex（k+1） = A0x（k） + A1x（k-1）. When we consider finite time stability concept, these new, delay independent conditions are derived using approach based on Lyapunov - like functions and their properties on sub-space of consistent initial conditions. .

关键词： Discrete descriptor time delayed systems Finite time stability Practical stability

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On Finite and Practical Stability of Time Delayed Systems:Lyapunov-Krassovski Approach,Delay Dependent Criteria

On Finite and Practical Stability of Time Delayed Systems:Ly...

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2011 Chinese Control and Decision Conference（CCDC）

作者： Dragutin lj.Debeljkovi ivan M.Buzurovi Tamara Nestorovi Dejan Popov University of Belgrade Faculty of Mechanical EngineeringDept.of Control Eng.11000 BelgradeSerbia Thomas Jefferson University Medical Physics DivisionPhiladelphiaPAUSA Ruhr-University of Bochum Dept.Mechanics of Adaptive SystemsGermany University of Belgrade Faculty of Mech.EngDept.of Control Eng.11000 BelgradeSerbia

This paper gives sufficient conditions for the practical and finite time stability of linear continuous time delay systems of the form X （t）=A0 x（t） + A1 x （t-τ）.When we consider finite time stability,these new,delay independent conditions are derived using the approach based on Lyapunov-Krassovski *** this case these functionals need not to have:a) properties of positivity in whole state space and b) negative derivatives along system *** we consider practical stability,before mentioned concept of stability,it is combined and supported by classical Lyapunov technique to guarantee attractivity properties of system behavior.

关键词： continuous singular time delay systems practical and finite time stability

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