科研之友
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摘要
The driving comfort, which is mainly determined by the pavement evenness, is one of the most important indexes for evaluating the pavement service condition. Current evaluation indexes for the pavement evenness, such as the international roughness index (IRI), are mainly determined by the vibration acceleration method. However, the driver is at the core in the human-vehicle-road-environment system. Few studies have focused on the physiological state as a response to accelerations induced by pavement unevenness and evaluate the driving comfort on this basis. In this study, the Root Mean Square of the Successive Differences (RMSSD) derived from the driver's heart rate variability (HRV) in the time domain and was selected as an index value for the driver's physiological state. Using an advanced indoor testing platform, the RMSSD values of five drivers were recorded by a KF2 electrocardiogram tester. The relationship between the RMSSD, the driving speed and the IRI underwent detailed analyses. The results of the tests show that the vertical vibration is identical when the drivers are driving on the simulated pavement with the same IRI value; however, the RMSSD values of different drivers were different, i.e., the perception of the same pavement evenness is subjective. Therefore, when evaluating the driving comfort based on the pavement evenness, it is necessary to consider the physiological index. The results obtained in this study have proven the feasibility of measurement of RMSSD value to evaluate the pavement evenness and driving comfort. They are therefore a powerful augmentation of existing evaluation methods and also provide a new reference for further optimization of the pavement surface performance.
