Accession Number : ADA119408

Title :   A Model for Prediction Bird and Ice Impact Loads on Structures.

Descriptive Note : Interim rept. 1 Oct 77-31 Nov 79,

Corporate Author : GENERAL ELECTRIC CO CINCINNATI OH AIRCRAFT ENGINE BUSINESS GROUP

Personal Author(s) : Boehman,Louis I ; Challita,Antonios

PDF Url : ADA119408

Report Date : May 1982

Pagination or Media Count : 96

Abstract : This report describes a loading model for computation of the pressure distribution exerted on surfaces during bird and ice impacts. Bird and ice impacts are considered as fluid dynamic in nature and are modeled as fluid jets impinging on arbitrarily shaped three dimensional deformable surfaces. A quasi-steady, potential flow analysis is applied to the jet impact problem thereby reducing the impact problem to the problem of solving Laplace's equation. The surface singularity technique is used to solve Laplace's equation. A computer program for computing pressure distributions on both rotating and non-rotating turbine engine components is both rotating and non-rotating turbine engine components is described. A model for treating slicing of birds and ice by rotating blades is incorporated into this computer program. The loading model computer program is specifically developed to be interfaced with finite-element structural analysis computer programs. Given the instantaneous impacted surface shape and displacement velocity the loading model computer program computes the pressure distribution existing on the impacted surface. The shape of the impact surface is fed to the loading model in the loading model in the form of finite element surface nodal computer program constructs a system of quadrilateral elements covering the impacted surface. The shape of the impact surface is fed to the loading model in the form of finite element surface nodal point coordinates. From this information, the loading model computer program constructs a system of quadrilateral elements covering the impacted surface.

Descriptors :   *Aircraft, *Impact, Surfaces, Shape, Loads(Forces), Birds, Ice, Gas turbine blades, Motion, Cutting, Water jets, Water flow, Mathematical prediction, Mathematical models, Fluid dynamics

Subject Categories : Structural Engineering and Building Technology
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE