scholarly journals Dynamic fatigue reliability of contact wires based on dynamic simulation of high-speed pantograph-catenary

2017 ◽  
Author(s):  
Ping Hu ◽  
Jie Liang ◽  
Wenli Fan
Keyword(s):  
Dynamic Simulation ◽  
High Speed ◽  
Fatigue Reliability ◽  
Dynamic Fatigue

scholarly journals Novel analysis methods of dynamic properties for vehicle pantographs

2018 ◽  
Vol 180 ◽  
pp. 01005 ◽  
Author(s):  
Andrzej Wilk
Keyword(s):  
Dynamic Analysis ◽  
Dynamic Simulation ◽  
High Speed ◽  
Dynamic Properties ◽  
Equations Of Motion ◽  
Computer Software ◽  
Fem Analysis ◽  
Electrical Energy ◽  
Modern Approach ◽  
Static And Dynamic 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.

scholarly journals CHALLENGES OF DYNAMIC SIMULATION OF HIGH-SPEED ELECTROMAGNETIC VALVES OF GAS DISTRIBUTION DEVICES

2020 ◽  
Vol 0 (5) ◽  
pp. 3-11
Author(s):  
E. I. Baida ◽  
B. V. Klymenko ◽  
Michael G. Pantelyat ◽  
Yu. A. Yelanskyi ◽  
D. Trichet ◽  
...  
Keyword(s):  
Dynamic Simulation ◽  
High Speed ◽  
Gas Distribution

A Network Implementation of Real-Time Dynamic Simulation With Interactive Animated Graphics

1988 ◽  
Author(s):  
M. W. Dubetz ◽  
J. G. Kuhl ◽  
E. J. Haug
Keyword(s):  
Real Time ◽  
Dynamic Simulation ◽  
High Speed ◽  
Dynamic Performance ◽  
Data Communication ◽  
Computing System ◽  
Data Sets ◽  
Parallel Processor ◽  
Network Computing ◽  
Time Dynamic

Abstract This paper presents a network based implementation of real-time dynamic simulation methods. An interactive animated graphics environment is presented that permits the engineer to view high quality animated graphics rendering of dynamic performance, to interact with the simulation, and to study the effects of design variations, while the simulation is being carried out. An industry standard network computing system is employed to interface the parallel processor that carries out the dynamic simulation and a high speed graphics processor that creates and displays animated graphics. Multi-windowing and graphics processing methods that are employed to provide visualization and operator control of the simulation are presented. A vehicle dynamics application is used to illustrate the methods developed and to analyze communication bandwidth requirements for implementation with a compute server that is remote from the graphics workstation. It is shown that, while massive data sets are generated on the parallel processor during realtime dynamic simulation and extensive graphics data are generated on the workstation during rendering and display, data communication requirements between the compute server and the workstation are well within the capability of existing networks.

Robust Design Analysis on Fatigue Life of Lead-Free Sn0.5Ag Solder in a Multichip Module Package

2013 ◽  
Vol 284-287 ◽  
pp. 375-379 ◽  
Author(s):  
Chieh Kung
Keyword(s):  
Fatigue Life ◽  
Integrated Circuits ◽  
Robust Design ◽  
High Speed ◽  
Flip Chip ◽  
Design Analysis ◽  
Influential Factor ◽  
Fatigue Reliability ◽  
Chip Technology ◽  
Ic Package

System-in-package (SiP) has become a mainstream technology in IC package industry as it provides the solutions to the growing needs of high speed functions, mobility/portability, energy efficiency, and miniaturization of electronic products. One special form of SiP is the multi-chip module (MCM) in which multiple integrated circuits (ICs), semiconductor dies or other discrete components are packaged onto a unifying substrate. Thus, the reliability of package integrity becomes one of the major reliability concerns. In the present paper, a robust design analysis on the thermo-mechanical reliability of an MCM package with flip-chip technology is demonstrated. Our results show that for the specific package, the CTE of the substrate is the most influential factor to the fatigue reliability of the package. The optimal combination of the parameters is recommended. The robust design analysis optimizes the fatigue life from 165 cycles to 1080 cycles which is a 554.5% gain on the fatigue life.

Modelling and Simulation of a Multiloop Flexible High-Speed Mechanism Bending Out of the Plane of Motion

1998 ◽  
Author(s):  
Pietro Fanghella ◽  
Carlo Galletti ◽  
Valerio Fiorini
Keyword(s):  
Dynamic Simulation ◽  
High Speed ◽  
Dynamic Behaviour ◽  
Actual System ◽  
Inverse Dynamic ◽  
Inverse Dynamic Model ◽  
Flexible Bodies ◽  
Classical Design ◽  
Linear Effects

Abstract A case study of dynamic simulation of a high-speed mechanism driven by three cams is presented. Starting from a planar inverse dynamic model, the following types of 3-D elastic and non-linear effects are taken into account to obtain an accurate model: a) deformations of the revolutes connecting the bodies; b) deformations and clearances in the couplings between cams and rollers; c) deformations of the bodies. Various types of models with up to six simultaneous flexible bodies have been developed by using a commercial multibody code (DADS) and the corresponding results are reported. The choice of the modal forms of the flexible bodies is discussed and the contributions of various effects to the dynamic behaviour of the system are analyzed. The paper shows that classical design techniques based on planar modelling yield unacceptable performances of the actual system.

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