Application And Research On Engineering Material Runway Arresting System

The various kinds and causes of the runway accidents are analyzed in the paper. Using the practical airport accident data, the equivalency of EMAS (Engineering Material Arresting System) is well validated. The Engineering requirements of EMAS and the characteristics of the arresting material properties and the design geometries are also put forward, including the computing methods of EMAS width, length, setback and the available arresting speed of aircrafts. Based on the static and dynamic analysis of EMAS, the mathematics-mechanics model of arresting system is established. Functional relationships among the initial kinetic energy, the stopping distance, the impressed depth, and the vertical, horizontal loads to the aircrafts are found. The action of the wheel-EMAS interface is studied in detail and the formulas of vertical and horizontal loads to the wheels are obtained. The vertical and horizontal loads of EMAS, the material density, the aircraft velocity, the landing gear configuration and the impressed depths of wheels in EMAS are derived. Through the simulation of arresting characteristics of EMAS, the influences of the system parameters in arresting process are analyzed. And a foundation is set for optimizing the parameters and the system design. An improved EMAS structure with two layer and hence different crushable strength are developed and the structure is more feasible for both heavy and light weight aircrafts. Dynamic analyses are made by considering the different impressed depths of tires in two layers of EMAS. The horizontal drag and vertical load to the wheels in different impressed depths are calculated. Finally, the construction and maintenance cost of EMAS are evaluated by the Present Value Theory, and the computing methods of its life cycle costs are presented.