UM多体动力学仿真2

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Integration of movement equation
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Evaluation results: flat-car platform frame
Lateral force
Alternative gauge
А1
A2
...
A9
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Mutivariant Analysis
Safety factor
Object Freight Car with three piece bogies New/New New/Worn-out
Hybrid model of platform car with containers
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Eigenmode computation
Platform car eigenmode (frequency 3.57 Hz)
Platform car eigenmode (frequency 4.55 Hz)
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Prof. Alexander Pavlukov, Ekaterinburg, Russia
Pavlukov and others ran test bench experiments with a freight three-piece bogie. Convergence between results of numerical simulation and test bench experiments within 12% bounds is obtained.
Operation conditions
Wheel/Rail profile
Load
Empty
Loaded
Track profile
Tangent
R=650m
R=350m
Tangent
R=650m
R=350m
Speed, km/hBiblioteka Baidu
40
60
80
90
Performances
Nadal Criterion
d) Р=10 kN
Experimental verification: comparison of experiment simulation experimental and simulation results
Comparison of experimental and simulation results
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Fracture pattern
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Multibody model of three-piece bogie Experimental verification Flexible bodies, stress load and durability Application
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Three-piece bogie 18-9810 and 189855
Tikhvin Freight Car Building Plant, Tikhvin, Russia, 2012
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Multibody model of three-piece bogie Experimental verification Flexible bodies, stress load and durability Application
experiment
simulation
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Multibody model of three-piece bogie Experimental verification Flexible bodies, stress load and durability Application
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Case Study: Choice of Rational Gauge
worn New
The problem appears because of the increased wear of wheel profiles. Russian Railways initiated researches concerning influence of track gauge on wheel profile wear and railway safety.
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Experimental verification: comparison of experimental and simulation results
Normal and friction forces between a frictional wedge and a side frame
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Three-piece bogie K6, China
Diagonal cross braces
Chinese three-piece bogie K6, model by SRI Ltd., China, 2009
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Mutivariant Analysis
Wheel profile wear and lateral forces
Object Freight Car with three piece bogies New/New New/Worn-out
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Friction system of three-piece bogie
Friction wedges
Model has 114 degrees of freedom and more than 250 contact interactions Contact points for the wedge
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o g i e
Simulation of dynamics of a system with wedge dampers
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i l
Three-piece bogie by AmstedRail, USA, 2008
Hybrid model of three-piece bogie with flexible side frame
Control points for stress calculation
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Calculation of stresses
Operation conditions
Wheel/Rail profile
Load
Empty
Loaded
Track profile
Tangent
R=650m
R=350m
Tangent
R=650m
R=350m
Speed, km/h
40
60
80
90
Performances
Wheel profile wear
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Model of freight car with three-piece bogies 18-100, 18-578
Models of freight car
Three-piece bogie 18-100, 18-578; 2000-2009; Russia
Models and Applications
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Simulation of Freight Car Dynamics: Mathematical Model, Safety, Wear
Computational Mechanics Ltd. Bryansk, Russia Dmitry Pogorelov, Vitaly Simonov, Roman Kovalev Vladislav Yazykov, Nikolay Lysikov
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Stress calculation for side frame
Finite element model of side frame contain: nodes 102185, finite elements 421653, 39 flexible modes Bottom view
Alternative gauge
А1
A2
...
A9
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Simulation Results
Movement in Tangent
Normalized data
The estimated rational gauge for tangent track coincides with the present gauge 1520 mm
Frictional wedges of various types
Experimental verification: outline
Experiment layout
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a) Р = 45 kN
b) Р = 30 kN
c) Р = 20 kN
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Contents
Multibody model of three-piece bogie Experimental verification Flexible bodies, stress load and durability Application
Maximal stress distribution (MPa)
Maximal stress amplitude distribution (MPa)
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Durability: experiment verification Evaluation results Evaluated dangerous area
Integration of movement equation of the freight wagon. Way is uneven, R=300 m.
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Example for hybrid model creation
Rigid body subsystem «Container» Flexible subsystem «Platform frame»: 15748 nodes 15324 finite elements Rigid body subsystems «Bogies»
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Factor Analysis
Response function: friction work in wheel/rail contact
Maximum stress amplitude distribution
Reduced equivalent amplitudes Fatigue crack, resulted from experimental research
Flat-car platform frame: experiment referencing