Microscopic simulation model calibration and validation for freeway work zone network - a case study of VISSIM

2006 ◽  
Author(s):  
Byungkyu Park ◽  
Hongtu Qi
Keyword(s):  
Simulation Model ◽  
Model Calibration ◽  
Work Zone ◽  
Microscopic Simulation ◽  
Calibration And Validation ◽  
Model Calibration And Validation

Microscopic Simulation Model Calibration and Validation: Case Study of VISSIM Simulation Model for a Coordinated Actuated Signal System

2003 ◽  
Vol 1856 (1) ◽  
pp. 185-192 ◽  
Author(s):  
Byungkyu (Brian) Park ◽  
J. D. Schneeberger
Keyword(s):  
Data Collection ◽  
Simulation Model ◽  
Model Calibration ◽  
Simulation Models ◽  
Test Bed ◽  
Microscopic Simulation ◽  
Calibration And Validation ◽  
Parameter Values ◽  
Model Calibration And Validation

Microscopic simulation models have been widely used in both transportation operations and management analyses because simulation is safer, less expensive, and faster than field implementation and testing. While these simulation models can be advantageous to engineers, the models must be calibrated and validated before they can be used to provide meaningful results. However, the transportation profession has not established any formal or consistent guidelines for the development and application of these models. In practice, simulation model–based analyses have often been conducted under default parameter values or bestguessed values. This is mainly due to either difficulties in field data collection or lack of a readily available procedure for simulation model calibration and validation. A procedure was proposed for microscopic simulation model calibration and validation and an example case study is presented with real-world traffic data from Route 50 on Lee Jackson Highway in Fairfax, Virginia. The proposed procedure consisted of nine steps: ( a) measure of effectiveness selection, ( b) data collection, ( c) calibration parameter identification, ( d) experimental design, ( e) run simulation, ( f) surface function development, ( g) candidate parameter set generations, ( h) evaluation, and ( i) validation through new data collection. The case study indicates that the proposed procedure appears to be properly calibrating and validating the VISSIM simulation model for the test-bed network.

Core Models for State-of-the-Art Microscopic Traffic Simulation and Kay Elements for Applications

2011 ◽  
pp. 92-124 ◽  
Author(s):  
Heng Wei
Keyword(s):  
Model Calibration ◽  
Traffic Simulation ◽  
State Of The Art ◽  
Choice Model ◽  
Microscopic Simulation ◽  
Calibration And Validation ◽  
Building Models ◽  
Car Following Model ◽  
Vehicle Trajectory ◽  
Model Calibration And Validation

This chapter summarizes fundamental models for microscopic simulation (such as vehicle generation model and car-following model) and other critical models (such as lane-choice model, lane-changing model, and route-choice model). Most of the critical models introduced in this chapter reflect the latest research results by the author. The primary purpose of this chapter is to provide fundamentals for better understanding of the travel behaviors that are modeled for traffic simulations. To facilitate the applications of traffic simulation models, several key elements for applying state-of-the-art computer traffic simulation tools are summarized. They include the procedure for building models, model calibration and validation. Further more, techniques for collecting vehicle trajectory data, critical elements used for model calibration and validation, are also introduced.

Development and Evaluation of a Procedure for the Calibration of Simulation Models

2005 ◽  
Vol 1934 (1) ◽  
pp. 208-217 ◽  
Author(s):  
Byungkyu (Brian) Park ◽  
Hongtu (Maggie) Qi
Keyword(s):  
Simulation Model ◽  
Model Calibration ◽  
Field Data ◽  
Traffic Simulation ◽  
Simulation Models ◽  
Transportation Engineering ◽  
Microscopic Simulation ◽  
Microscopic Traffic Simulation ◽  
Calibration And Validation ◽  
Simulation Results

Microscopic traffic simulation models have been playing an important role in the evaluation of transportation engineering and planning practices for the past few decades, particularly in cases in which field implementation is difficult or expensive to conduct. To achieve high fidelity and credibility for a traffic simulation model, model calibration and validation are of utmost importance. Most calibration efforts reported in the literature have focused on the informal practice, and they have seldom proposed a systematic procedure or guideline for the calibration and validation of simulation models. This paper proposes a procedure for microscopic simulation model calibration. The validity of the proposed procedure was demonstrated by use of a case study of an actuated signalized intersection by using a widely used microscopic traffic simulation model, Verkehr in Staedten Simulation (VISSIM). The simulation results were compared with multiple days of field data to determine the performance of the calibrated model. It was found that the calibrated parameters obtained by the proposed procedure generated performance measures that were representative of the field conditions, while the simulation results obtained with the default and best-guess parameters were significantly different from the field data.

Optimisation of a large WWTP thanks to mathematical modelling

2004 ◽  
Vol 50 (7) ◽  
pp. 113-122 ◽  
Author(s):  
C Printemps ◽  
A Baudin ◽  
T Dormoy ◽  
M. Zug ◽  
P.A. Vanrolleghem
Keyword(s):  
Wastewater Treatment ◽  
Mathematical Modelling ◽  
Wastewater Treatment Plant ◽  
Model Calibration ◽  
Treatment Plant ◽  
Mathematical Tool ◽  
Simple Description ◽  
Calibration And Validation ◽  
Simulation Results ◽  
Model Calibration And Validation

Better controlling and optimising the plant's processes has become a priority for WWTP (Wastewater Treatment Plant) managers. The main objective of this project is to develop a simplified mathematical tool able to reproduce and anticipate the behaviour of the Tougas WWTP (Nantes, France). This tool is aimed to be used directly by the managers of the site. The mathematical WWTP model was created using the software WEST®. This paper describes the studied site and the modelling results obtained during the stage of the model calibration and validation. The good simulation results have allowed to show that despite a first very simple description of the WWTP, the model was able to correctly predict the nitrogen composition (ammonia and nitrate) of the effluent and the daily sludge extraction. Then, a second more detailed configuration of the WWTP was implemented. It has allowed to independently study the behaviour of each of four biological trains. Once this first stage will be completely achieved, the remainder of the study will focus on the operational use of a simplified simulator with the purpose of optimising the Tougas WWTP operation.

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