Improving the safety of small cars

Wood, Denis P.; Doody, M

doi:10.1117/12.156261

Cited by 2 publications

(2 citation statements)

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“…A half sine pulse has been shown to be a satisfactory representation of impact acceleration pulse in many vehicle applications; refer, for example, to Varat and Husher [19]. Wood and Doody [20] derived the relationships between impact velocity, coefficient of restitution, maximum dynamic deflection, and mean and peak deceleration; refer to Appendix 4. Monte Carlo simulation was carried out using a maximum deflection C d,max , range from 0.02 to 0.333 m (range of measured distances between tip of handlebars to side of motorcycle, represented as a normal distribution with a mean of 0.177 m and a standard deviation of 0.052 m) and a coefficient of restitution e, range from 0 to 0.3 (represented as a uniform distribution).…”

Section: Deceleration During Initial Ground Impact (And Slide)mentioning

confidence: 99%

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Confidence limits for motorcycle speed from slide distance

Wood¹,

Alliot²,

Glynn³

et al. 2008

Proceedings of the Institution of Mechanical Engineers, Part D:

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In many motorcycle accidents, the motorcycle falls to the ground and slides to rest following impact or loss of control. The determination of the motorcycle speed just prior to ‘fall-over’ is important for biomechanics research and for litigation. This paper presents a new model of motorcycle fall-over and slide, which accounts for the loss of horizontal momentum resulting from the initial motorcycle-to-ground impact and the subsequent slide to rest. The model includes cases involving motorcycle fall-over owing to loss of control as well as impact. The models represent both the mean and variation present in the available experimental data for dry roads very well and are used to develop confidence limits for accident reconstruction purposes, in cases where only the motorcycle slide distance along the ground is known. Previously proposed confidence limit criteria are applied to predicting motorcycle speed ranges from slide distance, and it is shown that the level of prediction uncertainty can be substantially reduced in cases where additional information specific to the vehicle and road configurations is available.

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Section: Deceleration During Initial Ground Impact (And Slide)mentioning

confidence: 99%

“…Using a half-sine deceleration pulse model, it has been shown [20] that the crush depth C d,max , pulse duration T, and deceleration a, during impact are related by the following relations…”

Section: Appendixmentioning

confidence: 99%