ESDU TM 201
ESDU TECHNICAL MEMORANDUM
British Pendulum - use in modelling decelerating-force coefficients
Abstract:
Central to the ESDU modelling of braking resistance to motion is that the molecular-scale layer in a tyre footprint is sensitive to the temperature of the surface on which movement takes place. Studies involving use of the British Pendulum test device demonstrate that ground-surface temperature influences the skid-resistance of rubber and provide insight into the development of resistive forces as operating conditions vary.
Through modelling of experimental data, it is demonstrated that the micro-texture sharpness parameter, F1, can be deduced for any surface given a British Pendulum Number (BPN) reading and the surface temperature. The precision of the calculation is shown to be completely acceptable for the range of surfaces likely to be found on well-maintained airfield runways.
The deduced value of F1 can subsequently be used within ESDU methods to calculate forces on a loaded pneumatic aircraft tyre on a variety of plane surfaces.
A worked example of the application of the method is provided.
Indexed under:
- None
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