Post on 15-Apr-2017
transcript
New developments in Aimsun and future trends
Overview
• The integrated modelling philosophy• What’s new in Aimsun 8.2• New trends
Integrated modelling
MACRO
MESO
MICRO
Static assignment
Dynamic userequilibrium
or
Stochastic route choice
OD Matrix
Network data base
Path
s an
dpa
th fl
ows
data
bas
e
Traffic flow representationTraffic assignment
HYBRID
S
Role of network loading engines
Traversal OD Matrices & adjustment
DTA with DUE, paths assignment file
Detailed simulation,Pedestrians
New in Aimsun 8.2 – Demand forecasting• PT Crowding in cost functions
– Iterative Equilibrium process• PT Congestion Model
– Effective Frequency Model – Failure-to-board
• PT OD Adjustment– uses the equilibrium PT assignment
New in Aimsun 8.2 – Macro level
• Macro Dynamic– Presented yesterday
• Use of control plan– Macro static
assignment– Macro static OD
adjustment– TPF
New in Aimsun 8.2 – Meso level
• Initial state to start from– Decrease DUE time for long periods
New in Aimsun 8.2 – Dynamic Traffic Assignment• DUE New Gradient-
based method• DUE Path pruning• Incremental DUE• Use Rgap matrices
asinput• Output Rgap
matrices• Rgap for SRC
New in Aimsun 8.2 – Micro level
• Two-lane car-following model between adjacent sections
• Stop line adjustable• DUE Path pruning• Incremental DUE• Use Rgap matrices as
input• Output Rgap matrices• Rgap for SRC
New in Aimsun 8.2 – Interfaces
• SCATS ITS Data Port
• SCATS SRMS• SIDRA interface• VERSIT+
emissions and energy use model
New trends
• Improve usability of the integrated framework
• Activity Base Model with DTA
• Automated vehicles• Aimsun Online
applications• Peak spreading
techniques• Meso parallelisation