TAILIEUCHUNG - The Motor Vehicle 2010 Part 14

Tham khảo tài liệu 'the motor vehicle 2010 part 14', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 936 The Motor Vehicle Fig. The HITS Head Impact Test System rig used by MIRA for assessing the occupant-friendliness of interior components and trim road. This not only increases the speed of onset of aquaplaning but also helps to maintain a high coefficient of friction between tyre and road. Incidentally a useful rule of thumb for estimating aquaplaning speeds for tyres without treads is Aquaplaning speed 9 X tyre pressure It is based on experimental data and the fact that recommended tyre pressures are a function of among other things the load on the tyre and the area of its contact patch with the road. Aquaplaning occurs when the film of water on the road is driven by the forward rolling motion of the wheels into the wedge-shaped-gap between the tyre and the leading edge of its contact patch with the road. At the critical aquaplaning speed the pressure in this wedge of water has risen to the point at which it is high enough to support the vehicle. Therefore the tyres then ride up on to the film of water which of course has a coefficient of friction even lower than that of ice so the car is floating and will respond to neither steering nor braking forces. An important aspect of design for active safety is the minimisation of driver stress and fatigue. Another is provision for warning the driver of danger as early as possible before the situation becomes critical. To this end good all round visibility and efficient lighting at night are for instance two of the measures that can be taken. Others include the installation of devices such as electronic detection systems for warning the driver that he is becoming drowsy some of these depend on the monitoring of eyelid movements and others of pulse and steering wheel movements. Thirdly the design should be such that should the car become involved in an accident its occupants will be so far as practicable protected from injury due to collapse of the structure. Vehicle safety 937 Structural safety and air bags

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