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Romano, Luigi; Johannesson, Pär; Bruzelius, Fredrik; Jacobson, Bengt
Transportation research. Part D, Transport and environment, 08/2021, Letnik: 97Journal Article
•The new stochastic operating cycle includes models for the weather and traffic.•A primary model for the weather category is introduced to account for seasonality.•A regression analysis is made to investigate spread in CO2 emissions.•It is found that both seasonal and traffic settings influence CO2 emissions. The present paper extends the concept of a stochastic operating cycle (sOC) by introducing additional models for weather and traffic. In regard to the weather parameters, dynamic models for air temperature, atmospheric pressure, relative humidity, precipitation, wind speed and direction are included. The traffic models is instead based on a macroscopic approach which describes the density dynamically by means of a simple autoregressive process. The enhanced format is structured in a hierarchical fashion, allowing for ease of implementation and modularity. The novel models are parametrised starting from data available from external databases. The possibility of generating synthetic data using the statistical descriptors introduced in the paper is also discussed. To investigate the impact of the novel parameters over energy efficiency, a sensitivity analysis is conducted with a combinatorial test design. Simulation results show that both seasonality and traffic conditions are responsible for introducing major variations in the CO2 emissions.
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