Chiba Kanae

Study on utilization of in-car noise and vibration in road surface property evaluation

Miyaki Yasuyuki


In japan, MCI (Maintenance Control Index) is commonly used as an indicator of road maintenance. To acquire MCI data, it takes a lot of cost and time to use speciali tangiblezed equipment. In addition, the MCI evaluates the average road surface condition within the interval of about several hundred meters.Therefore, it is difficult to identify particularly damaged places within the section.The purpose of this research is to estimate points with especially severe damage in the measurement section by a simple and inexpensive method.
In the results of MCI measurements in Nagaoka City, it was found that cracks in the road were the main cause of the decrease in MCI.Therefore, among various types of damage, I decided to evaluate cracks. As a specific method, I measured the vibration and noise generated inside the car, and compare the measured value with the actual road surface condition. And I set the final goal to estimate the occurrence of cracks from measured value information.
As a result of comparing the measured value with the actual road surface condition, the occurrence of crack perpendicular to the traveling direction could be predicted from the measured value.Next, I examined a method to obtain large amplitude from all cracks including crack perpendicular to the traveling direction and tried removing the influence of flatness from measured values.As a result, it was possible to estimate 79.1% of cracks perpendicular to the direction of travel,"vertical cracks",in the sites of occurrence. Regarding mesh cracks, it was 67.8%.
Further studies are needed in order to data processing method for estimating cracks which are not vertical cracks.