Research On Bi-Objective Path Selection Considering Driving Comfort

With the improvement of road construction,driving comfort has gradually become an important factor affecting the traveler’s path selection.The traveler’s path selection behavior preference presents the characteristics of diversity.Travelers with both speed and comfort preference often need to make a trade-off between travel time and driving comfort when making decisions.In order to better explain and guide the path selection behavior of travelers,it is necessary to study the path selection of travelers with both speed and comfort preference.Based on the basis of related research at home and abroad,this thesis analyzes the influencing factors of driving comfort from the perspective of each component of the road traffic system.Among them,road smoothness and road alignment have the most significant impact on driving comfort.Since the acceleration noise is closely related to the driving comfort,the acceleration noise is selected as the quantitative index of the driving comfort.By analyzing the mechanical characteristics of the vehicle,the acceleration models in the lateral,longitudinal and vertical of the linear segment are established respectively.Based on the acceleration noise theory,the acceleration noise models in the lateral,longitudinal and vertical of the linear segment are deduced respectively.Due to the different sensitivity of the human body to the acceleration noise in different directions,different weight coefficients are assigned to the acceleration noise in the three directions,and a total acceleration noise model based on the lateral,longitudinal and vertical of the linear segment is established.The total acceleration noise of the road based on lateral,longitudinal and vertical is equal to the weighted average of the three-direction total acceleration noise of all the linear segments that make up the road segment.The total acceleration noise of the path based on the lateral,longitudinal and vertical is equal to the weighted average of the three-direction total acceleration noise of all the roads that make up the path.Based on this,the total acceleration noise model of the road based on the lateral,longitudinal and vertical and the total acceleration noise model of the path based on the horizontal,vertical and vertical are established in turn.A bi-objective path selection model considering driving comfort is established with the total acceleration noise of the path in three directions and the path travel time as the objective function.According to the characteristics of the traveler’s path selection studied,the weighted summation algorithm and NSGA-Ⅱ algorithm is designed that conforms to the path selection research of this thesis.Using MATLAB software for programming,the validity of the total acceleration noise model based on the lateral,longitudinal and vertical and the bi-objective path selection model considering driving comfort are verified through calculation examples.The total acceleration noise model of the path based on the lateral,longitudinal and vertical established in this thesis realizes the quantification of driving comfort,and has certain reference value for the quantitative evaluation of driving comfort.The bi-objective path selection model considering driving comfort established in this thesis can well explain and guide the path selection behavior of travelers with both speed and comfort preference.Compared with the traditional optimization algorithm,NSGA-Ⅱ algorithm has more comprehensive solution results for the model and can meet the needs of travelers with different preference of speed and comfort.