Dynamical behaviour of a composite cockpit of PW-5 glider when hitting against a ground barrier - the issue of pilot's safety

Łukasz Lindstedt

Abstract

The problem of dynamical behaviour of a cockpit of PW-5 glider when it hits against a ground barrier has been considered in the presented paper. The attention was focused on the issue of pilot’s safety; i.e., on one of the problems considered within the framework of aircraft accident analysis. The research aimed at the development of a numerical model of the pilot-glider-surroundings system, which could allow for the analysis of aircraft accidents in view of pilot’s safety. The model should combine dynamical behaviour of a pilot with the behaviour of composite cockpit during the crash. To achieve the aforementioned goal the following three tasks were concentrated on: development of a physical model representing phenomena that can be observed in the pilot-glider system when the glider cockpit (with the pilot inside it) hits against a ground barrier, development and testing of the mathematical model by means of numerical simulations as well as experimental verification of the developed model (crash tests). The scope of experimental investigations covered two cockpit full-scale crash tests that have been developed and carried out; i.e., the glider impact onto a ground barrier at a speed of 54,7 km/h and the glider impact onto a non-deformable ground barrier at a speed of 77 km/h. In the course of the aforementioned tests the developed model of PW- 5 glider cockpit and an anthropometrical dummy Hybrid II were used. The applied measuring devices allowed for registration of a large number of results, representing both the loads carried by the glider cockpit structure and those imposed on the human body. The data gathered that way were then used in verification of the developed numerical model. The theoretical investigations consisted in the development of a new, unique, large structural model of PW-5 glider cockpit, built in terms of the Finite Element Method with the most advanced numerical techniques applied. Some elements of the system exerting only slight influence upon the course of the process were represented in terms of the Multi-body System Method. Taking the aforementioned approach one can arrive at a hybrid model, that on the one hand allows one to represent adequately dynamical properties of the composite glider cockpit, and on the other hand brings about a reasonable computation time. The results obtained prove enormous capabilities of the advanced numerical tools for analysing aircraft accidents.
Diploma typeDoctor of Philosophy
Author Łukasz Lindstedt (FPAE / IAAM)
Łukasz Lindstedt,,
- The Institute of Aeronautics and Applied Mechanics
Title in EnglishDynamical behaviour of a composite cockpit of PW-5 glider when hitting against a ground barrier - the issue of pilot's safety
Languagepl polski
Certifying UnitFaculty of Power and Aeronautical Engineering (FPAE)
Disciplinemechanics / (technology domain) / (technological sciences)
Defense Date01-12-2010
Supervisor Krzysztof Kędzior (FPAE / IAAM)
Krzysztof Kędzior,,
- The Institute of Aeronautics and Applied Mechanics

Internal reviewers Piotr Czarnocki (FPAE / IAAM)
Piotr Czarnocki,,
- The Institute of Aeronautics and Applied Mechanics

Tadeusz Niezgoda
Tadeusz Niezgoda,,
-
Pages204
Internal identifierMEL; D-146
Keywords in Englishxxx
Abstract in EnglishThe problem of dynamical behaviour of a cockpit of PW-5 glider when it hits against a ground barrier has been considered in the presented paper. The attention was focused on the issue of pilot’s safety; i.e., on one of the problems considered within the framework of aircraft accident analysis. The research aimed at the development of a numerical model of the pilot-glider-surroundings system, which could allow for the analysis of aircraft accidents in view of pilot’s safety. The model should combine dynamical behaviour of a pilot with the behaviour of composite cockpit during the crash. To achieve the aforementioned goal the following three tasks were concentrated on: development of a physical model representing phenomena that can be observed in the pilot-glider system when the glider cockpit (with the pilot inside it) hits against a ground barrier, development and testing of the mathematical model by means of numerical simulations as well as experimental verification of the developed model (crash tests). The scope of experimental investigations covered two cockpit full-scale crash tests that have been developed and carried out; i.e., the glider impact onto a ground barrier at a speed of 54,7 km/h and the glider impact onto a non-deformable ground barrier at a speed of 77 km/h. In the course of the aforementioned tests the developed model of PW- 5 glider cockpit and an anthropometrical dummy Hybrid II were used. The applied measuring devices allowed for registration of a large number of results, representing both the loads carried by the glider cockpit structure and those imposed on the human body. The data gathered that way were then used in verification of the developed numerical model. The theoretical investigations consisted in the development of a new, unique, large structural model of PW-5 glider cockpit, built in terms of the Finite Element Method with the most advanced numerical techniques applied. Some elements of the system exerting only slight influence upon the course of the process were represented in terms of the Multi-body System Method. Taking the aforementioned approach one can arrive at a hybrid model, that on the one hand allows one to represent adequately dynamical properties of the composite glider cockpit, and on the other hand brings about a reasonable computation time. The results obtained prove enormous capabilities of the advanced numerical tools for analysing aircraft accidents.
Thesis file
Lindstedt.pdf 31.46 MB

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