Applied Mechanics and Materials
The present paper is aimed to introduce a quantitative and qualitative simulation algorithm developed by its authors for observing and calculation of the velocity and the taking-off distance. It is well-known that there have been exiting or hard-nuts or troubles in risk-recognition and control in the takeoff stage of the airliners,which in turn may lead to disastrous accidents. In hoping to work out an approach to more efficiently recognize the hazards on the high-speed running,we have done a lot of qualitative and quantitative testing and measurements so as to develop a method which is in a position to demonstrate the safety conditions and the likely-to-be-recognized errors beyond the control power of the pilots. In proceeding with our research,we have taken a specific event as one of our case studies. As a matter of fact in aviation practice,the safety margin is related with the time and the speed. As is known,the traditional time requirement for evacuation is 90 seconds,which means the extreme urgency and narrow escape possibility if anything disastrous would happen. The simulated results of ours reveal that the margin of aborted takeoff is higher than the machine crash-down,which may lead less harm to their passengers. Since there may exist exit-neglect for the real or highly probable accidents in the conventional regulation for the rejected takeoff when a high-speed running accident takes place,it is of great necessity for the pilot to promptly recognize the abnormal conditions. Detailed comparison made between the 90 seconds requirement for evacuation and the regulations for the aborted taking-off lead us to the discovery that the 90 second requirement for evacuation has the higher order than the V1 limitation,which implies first of all the realistic danger likely for the pilot and the passengers to be confronted with. On the other hand,the given quantitative and qualitative simulation algorithm can naturally be taken to serve as a guide for the flight training and decision-making in the urgent case with some dilemma.