This study adopted a metamodel-based technique for model sensitivity analysis and applied it to the AIMSUN mesoscopic model. The application of sensitivity analysis is crucial for the true comprehension and correct use of the traffic simulation model, although the main obstacle to an extensive use of the most sophisticated techniques is the high number of model runs such techniques usually require. For this reason, the possibility of performing a sensitivity analysis was tested not on a model but on its metamodel approximation. Important issues concerning metamodel estimation were investigated and commented on in the specific application to the AIMSUN model. Among these issues are the importance of selecting a proper sampling strategy based on low-discrepancy random number sequences and the importance of selecting a class of metamodels able to reproduce the inputs–outputs relationship in a robust and reliable way. Sobol sequences and Gaussian process metamodels were recognized as the appropriate choices. The proposed methodology was assessed by comparing the results of the application of variance-based sensitivity analysis techniques with the simulation model and with a metamodel estimated with 512 model runs for a variety of traffic scenarios and model outputs. Results confirmed the power of the proposed methodology and also made a more extensive application of sensitivity analysis techniques available for complex traffic simulation models.


    Access

    Download

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Gaussian Process Metamodels for Sensitivity Analysis of Traffic Simulation Models


    Subtitle :

    Case Study of AIMSUN Mesoscopic Model


    Additional title:

    Transportation Research Record: Journal of the Transportation Research Board


    Contributors:


    Publication date :

    2013-01-01




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




    Several Nominal Distances for Rotorcraft Gaussian Process Metamodels in the Presence of Categorical Alternatives

    Rio, J. / Mavris, D. / American Helicopter Society | British Library Conference Proceedings | 2014


    Metamodels for Aeroelasticity

    mortchelewicz, g.d. / Tekhniyon, Makhon tekhnologi le-Yisra'el | British Library Conference Proceedings | 2013


    Construction of stochastic simulation metamodels using smoothing splines

    Reis dos Santos,P.M. / Reis dos Santos,M.I. / Tech.Univ.of Lisbon,PT | Automotive engineering | 2012


    Self-Learning Metamodels for Optimization

    Peri, Daniele | Online Contents | 2009