Modeling free-flow speed according to different water depths—From the viewpoint of dynamic hydraulic pressure
| Autor: | Tomonori Sumi, Ming Wei Liu, Yoshinao Oeda |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
050210 logistics & transportation
Engineering Tractive force business.industry 05 social sciences Transportation 02 engineering and technology Mechanics Aquaplaning Contact force Lift (force) Water depth Bernoulli's principle 020303 mechanical engineering & transports 0203 mechanical engineering Free flow Road surface 0502 economics and business Geotechnical engineering business General Environmental Science Civil and Structural Engineering |
| Zdroj: | Transportation Research Part D: Transport and Environment. 47:13-21 |
| ISSN: | 1361-9209 |
| DOI: | 10.1016/j.trd.2016.04.009 |
| Popis: | In this paper, we propose a method of modeling free flow speed from the viewpoint of hydroplaning. First, the lift forces for different water depths were estimated using Bernoulli’s equation. Compared with the result of the experimental test performed by the Japan Automobile Research Institute, the hydrodynamic pressure coefficient was determined to be 0.03 (tf s 2 /m 4 ). The validation of the predicted lift force is found in another published paper. A very good match is found between the computed values by the proposed numerical model and the data in other published papers. Then, the loss of contact force is considered to evaluate the hydroplaning performance of a tire. To simulate the hydroplaning speed, a tire-sliding model was utilized to obtain the traction and friction forces between the road surface and the tire. The observation data obtained in Japan in 2009 is compared with the physically computed hydroplaning speed, yielding the conclusion that the traction force at the measured desired speed is, on average, 23.4% of the traction force at hydroplaning speed. The analytical model offers a useful tool to quantitatively show that the free flow speed changes as the water depth increase. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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