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Transcript of Rail Case Studies
Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.
Accelerating Design and Analysis of High Speed Railcars
at Changchun Railway Vehicles
• Challenge
• Development of high-speed trains requires more intensive
use of CAE
• Six weeks to build CAE models with existing solution
• Solution
• HyperMesh for building railcar models for ANSYS simulations
• OptiStruct to optimize performance
• Benefits
• Reduction of modeling time by 50% (from six to three weeks)
• Better mesh quality improved result accuracy
• Better design performance as a result of integrated optimization
“It’s not just that we can build up a HyperMesh model more quickly, of all the CAE software
that I’ve used or seen, HyperMesh delivers the finest model quality.”
Dr. Xuedong Yan, Chief Information Officer, Changchun Railway Vehicle Company, China
Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.
Case Study Reducing Development Time at STADLER
“We decided to use HyperWorks because it exactly
matches our request for an engineering framework
and also included optimization software.” Dr. Alois Starlinger
Head of Certification, STADLER, Switzerland
Challenge
• Need more efficient simulation process to reduce
development time
• Glacier Express: need to reduce weight due to
operation conditions in the mountains
Solution
• HyperWorks Simulation Framework to reduce
modeling time for simulations
• Optimization to reduce structural weight
Results
• 20% reduction in simulation time
• 15% less material as a result of simulation in the
design process
Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.
Energy Absorber System Design
Challenge
• Development of energy absorber system to meet new
European Safety Requirements
• New concept for high-speed trains
Solution
• RADIOSS for crash simulation
• Calibration of test-simulation results
• Hyperstudy - Design variations to optimize
performance
• Simulation of various impact scenarios
• AGV vs. AGV
• AGV vs. freight wagon
• AGV vs deformable obstacle
Results
• AGV compliant with new regulations
• Entire energy absorption in front train section
Blue:RADIOSS
Red: Test
Force vs. time during impact
Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.
Contacts between the wheels and the rails
determined using the geometry of the wheels
and not the mesh of it.
XTER Railcar - Crash Analysis
Simulation using RADIOSS
Frontal crash absorber
Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.
Challenge • Electric railway crossing parachutist landing area • Layout of overhead electric wire protection system
to minimize parachutist injury at impact • Initial configuration: protective metallic net with
four horizontal cables
Solution • RADIOSS for explicit simulation with Hybrid III
dummy model • Goal: minimize HIC value and forces on various
parts of the body • Simulation of 14 impact scenarios (various impact
positions and zones along the protection device)
Results • Design modified by adding three additional cables • Reduction of parachutist injury risk
Reducing Parachutist Injury Risk
“By using simulation to assess the stiffness and improve the design of the protection device,
we could prove that numerical dummies can be successfully used in different fields” Didier Lévèque, Safety Manager
SNCF, France
Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.
Process Automation – Report Generation
Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.
Improve Ride/Noise of Locomotive Cab
using System Engineering Approach
Challenge
• Reduce noise levels in cab while
improving ride characteristics
Solution
• Characterize locomotive sub-systems
from track to cab using finite element
simulation
• Propose and evaluate strategies for
ride/noise
Results
• Best strategy improves ride in cab by
factor of 10 while reducing noise
• Novel solution for locomotive developed
for implementation
Copyright © 2009 Altair Engineering, Inc. Proprietary and Confidential. All rights reserved.
High Speed Rail AcuSolve Product Suite
Challenge: Aerodynamics of passing trains
creates noise and forces that can affect
mechanical performance and passenger comfort
(e.g. your seat can rotate or yaw as you pass
another bullet train in the opposite direction
Solution:
•AcuSolve’s accuracy on a transient sliding mesh
simulation allowed accurate prediction of both
phenomena
Business Impact:
•Accurate simulation reduces expensive
experimental testing and validations of proposed
high speed train design and modifications to
external structures (e.g. pantographs
AcuSolve’s uniqie Finite Element Based formulation (GLS) enables accuracy such that the transient
forces on the high speed rail car can be calculated accurately along with the noise created by structures
on train body