Forensic Engineering Principles of Motorcycle Analysis (original) (raw)
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Motorcycle Accident Reconstruction Part I - Physical Models
2012
The purpose of this paper is to evaluate different formulas which are used to estimate the motorcycle's pre-collision speed in motorcycle-to-car accidents. These formulas are based on measurable physical parameters such as motorcycle' wheelbase change and fundamental physical laws such as conservation of momentum. The evaluation used data from crash experiments performed by the authors as well as published experimental data. The results of these evaluations indicate that the motorcycle's pre-collision speed cannot be estimated with high accuracy.
Journal of the National Academy of Forensic Engineers
This Paper Will Examine The Effect Of A Motorcycle Driving Into A Longitudinal Joint, Sometimes Called A Rut. If The Approach Angle Is Approximately Less Than Ten Degrees In The Direction Of Travel, The Forces That Are Generated On The Front Tire Due To Striking The Rut, Joint Or Curb, May Cause The Front Motorcycle Tire To Lose Its Ability To Steer Or Brake, And May Initiate A Vibration, Or Caster Effect, Or Wobble, Which Can Result In The Instability And Capsizing The Motorcycle.
Motorcycle Structural Response in Simulated Vehicular Collision
This preliminary study explores a full scale vehicular crash test in which a motorcycle impacted a car in a right angle collision in an outdoor ground. The test utilized a customized fixture attached to an SUV as a propulsion system. Relevant data and high speed images were recorded for the analysis of motion, wheelbase shortening and deformation and damage assessment. The simulated test has certain kinematic similarity with other studies, especially prior to 100 ms timeframe. Beyond that, the motorcycle kinematics was less aggressive possibly due to lower impact speed and stability issue prior to impact. It was also showed that wheelbase shortening may likely reach the maximum for certain speed range for the class of motorcycle being tested. Lastly, assessment of motorcycle damage indicated that deformation occurred mainly from the steering stem base forward. All motorcycles did not exhibit any main-frame distortion.
COLLISION BETWEEN MOTORCYCLE AND PASSENGER VEHICLE: ANALYSIS BY THE LINEAR MOMENT CONSERVATION METHOD (Atena Editora), 2021
This work presents a detailed analysis, through the Physical Method of Linear Moment Conservation, of a traffic accident involving passenger vehicle and motorcycle, aiming to identify the culpability for the collision. The analysis methodology used here was based on the following elements: vehicle masses; speeds before and after the collision; at the entry and exit angles of vehicles at the impact site, among other elements. Thus, for the type of collision on screen, it was concluded that the motorcycle was the vehicle responsible for the collision under analysis, presenting an entry angle at the probable collision point (PPI) at 12.41° and an exit angle at 16° . Angles which corroborate the motorcycle immobilization position information present in the collision record by an official agency. Desta maneira, para o tipo de colisão em tela, concluiu-se que a motocicleta foi o veículo responsável pela colisão em análise, apresentando ângulo de entrada no provável ponto de colisão (PPI) em 12,41° e ângulo de saída em 16°. Ângulos os quais corroboram a informação de posição de imobilização da motocicleta presente no registro desta colisão por órgão oficial.
Revista Caribeña de Ciencias Sociales
In this work, a detailed assessment of the structural and mechanical deformation energies caused by a traffic accident, involving a motorcycle and the passenger vehicle is carried out, with the objective of estimating the collision speed. Were, also verified vector orientations, braking marks and occupant launch projection for further comparative analysis with the photogrammetric method of estimating displacement speed. Finally, with the velocity values thus obtained, we compare with the result photogrammetric was performed. Thus, for the type of accident on the screen, we concluded that the best method of estimating the collision speed involving a car and a motorcycle was the combination between the method of reduction between axles and the method of mechanical deformations, resulting in the best approximation in relation to the photogrammetric result reaching 93% approximation to the photogrammetric result obtained.
Diagnostics
We report the case of a 54-year-old man who died in a motorcycle accident due to loss of control of the vehicle on a viaduct. No other vehicles were apparently involved, except for a car hit by the motorcycle after it fell. A post-mortem CT scan (computed tomography scan) was performed showing complex head trauma with a subarachnoid hemorrhage and multiple skull and facial bone fractures. A forensic cinematic reconstruction performed by an engineer was needed to exclude other incident causes other than the loss of control. The multidisciplinary approach that included autopsy findings, a cinematic reconstruction, a helmet test and an examination played a key role in clarifying the dynamics of the accident, allowing us to explain how the death occurred despite the motorcyclist’s helmet use. The cause of death was identified as a penetrating head trauma with cerebral material exposure, produced by the impact of the head against a fixed bolt in the guardrail base. Despite the use of the...