Dynamic Analysis of 3 Different Cross-Sectional Shapes of a Fill Dam using 3D FEM Analysis

Transmission of electrical energy from a catenary system to traction units must be safe and reliable especially for high speed trains. Modern pantographs have to meet these requirements. Pantographs are subjected to several forces acting on their structural elements. These forces come from pantograph drive, inertia forces, aerodynamic effects, vibration of traction units etc. Modern approach to static and dynamic analysis should take into account: mass distribution of particular parts, physical properties of used materials, kinematic joints character at mechanical nodes, nonlinear parameters of kinematic joints, defining different parametric waveforms of forces and torques, and numerical dynamic simulation coupled with FEM calculations. In this work methods for the formulation of the governing equations of motion are presented. Some of these methods are more suitable for automated computer implementation. The novel computer methods recommended for static and dynamic analysis of pantographs are presented. Possibilities of dynamic analysis using CAD and CAE computer software are described. Original results are also presented. Conclusions related to dynamic properties of pantographs are included. Chapter 2 presents the methods used for formulation of the equation of pantograph motion. Chapter 3 is devoted to modelling of forces in multibody systems. In chapter 4 the selected computer tools for dynamic analysis are described. Chapter 5 shows the possibility of FEM analysis coupled with dynamic simulation. In chapter 6 the summary of this work is presented.

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DYNAMIC ANALYSIS OF THIN-WALLED BEAMS CONSIDERING CROSS-SECTIONAL DEFORMATIONS

Proceedings of the Japan Society of Civil Engineers ◽

10.2208/jscej1969.1974.223_11 ◽

1974 ◽

Vol 1974 (223) ◽

pp. 11-22

Author(s):

Hideharu Nakamura

Keyword(s):

Dynamic Analysis ◽

Cross Sectional ◽

Thin Walled

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Investigation of Complex Structural Designing of Mobile Facilities for Shipbuilding in Lithuanian Sea Region

Mechanika ◽

10.5755/j02.mech.28740 ◽

2021 ◽

Vol 27 (3) ◽

pp. 237-243

Author(s):

Tadas ASTRAUSKAS ◽

Michail SAMOFALOV

Keyword(s):

Dynamic Analysis ◽

Longitudinal Direction ◽

Cross Sectional ◽

Climatological Data ◽

Second Stage ◽

Third Stage ◽

Calculation Results ◽

Complex Structural ◽

Mobile Facilities

In the paper, it is proposed to cover by a mobile moving facility the shipyard open site, in Klaipeda, Lithuania (the EU). The facility of 40 m span consists of transversal frames, which are arranged by the step of 6.0 m, and a system of braces. Two types of steel frames have been considered: trussed and continuous. The actions are specified according to the design codes (Eurocode 3) and climatological data. In dynamic analysis, the longitudinal direction is defined for an inertia action, simulating braking. For calculating, a special algorithm of three stages has been prepared. At the first stage, three calculation schemes of one transversal frame were created. For the proposed schemes of the mobile moving facility, the calculation of only a transversal frame is effective in the preliminary determination of the cross-sectional areas and of the total structural weight. At the second stage, the frames were joined by braces. A preliminary comparison of the calculation results of the models was carried out after the first and second stages of the analysis. At the third stage, the dynamic analysis was performed and the influence of the dynamic impact was estimated. Finally, we compared the calculation results of three different FEM models and chose the most appropriate one. To sum up the investigations, conclusions and recommendations are presented.

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Evaluation of Fatigue Characteristics of Aluminum Alloys and Mechanical Components Using Extreme Value Statistics and C-specimens

Metals ◽

10.3390/met11121915 ◽

2021 ◽

Vol 11 (12) ◽

pp. 1915

Author(s):

Jungsub Lee ◽

Sang-Youn Park ◽

Byoung-Ho Choi

Keyword(s):

Aluminum Alloys ◽

Fem Analysis ◽

Extreme Value ◽

Fatigue Tests ◽

Extreme Value Statistics ◽

Fatigue Properties ◽

Chemical Compositions ◽

Cross Sectional ◽

Fatigue Characteristics ◽

Mechanical Components

In this study, the fatigue characteristics of aluminum alloys and mechanical components were investigated. To evaluate the effect of forging, fatigue specimens with the same chemical compositions were prepared from billets and forged mechanical components. To evaluate the cleanliness of the aluminum alloys, the cross-sectional area of specimens was observed, and the maximum inclusion sizes were obtained using extreme value statistics. Rotary bending fatigue tests were performed, and the fracture surfaces of the specimens were analyzed. The results show that the forging process not only elevated the fatigue strength but also reduced the scatter of the fatigue life of aluminum alloys. The fatigue characteristics of C-specimens were obtained to develop finite-element method (FEM) models. With the intrinsic fatigue properties and strain–life approach, the FEM analysis results agreed well with the test results.

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Detection of Plural Cracks in Steel using Horizontal Coils-3D FEM Analysis Considering Hysteresis and Non-Uniformity of Steel-

IEEJ Transactions on Fundamentals and Materials ◽

10.1541/ieejfms.125.835 ◽

2005 ◽

Vol 125 (10) ◽

pp. 835-840

Author(s):

Yuji Gotoh ◽

Norio Takahashi

Keyword(s):

Fem Analysis ◽

3D Fem

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Measurement of reduction for ground response - Vibration test of soil-bag and 3D-FEM analysis

10.1201/9781003209379-14 ◽

2021 ◽

pp. 79-85

Author(s):

K. Yahata ◽

T. Ishibashi ◽

Y. Kiyota ◽

K. Sakuraba

Keyword(s):

Fem Analysis ◽

Vibration Test ◽

3D Fem ◽

Ground Response

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Wind or Hydro Homo-Heteropolar Synchronous Generators: Equivalent Magnetic Circuit and FEM Analysis

MATEC Web of Conferences ◽

10.1051/matecconf/201821002008 ◽

2018 ◽

Vol 210 ◽

pp. 02008

Author(s):

Sorin Ioan Deaconu ◽

Marcel Topor ◽

Lucian Nicolae Tutelea ◽

Ilie Nucă ◽

Marcel Burduniuc

Keyword(s):

Low Power ◽

Magnetic Circuit ◽

Low Cost ◽

Fem Analysis ◽

Synchronous Machine ◽

Preliminary Design ◽

Synchronous Generators ◽

3D Fem ◽

Electric Wind

In an effort to introduce a low cost (PM less), low power electric wind or hydro generators, this paper reports on preliminary design aspects, equivalent magnetic circuit and 3D FEM analysis of a 2.5 KVA, 250-1000 rpm, reactive homo-heteropolar brushless synchronous machine (RHHBSM).

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