Probabilistic Structural Analysis Methods of Hot Engine Structures

Development of probabilistic structural analysis methods for hot engine structures is a major activity at Lewis Research Center. It consists of three program elements: (1) composite load spectra methodology, (2) probabilistic structural analysis methodology, and (3) probabilistic structural analysis application. Recent progress includes: (1) quantification of the effects of uncertainties for several variables on High Pressure Fuel Turbopump (HPFT) turbine blade temperature, pressure, and torque of the Space Shuttle Main Engine (SSME), (2) the evaluation of the cumulative distribution function for various structural response variables based on assumed uncertainties in primitive structural variables, and (3) evaluation of the failure probability. Collectively, the results demonstrate that the structural durability of hot engine structural components can be effectively evaluated in a formal probabilistic/reliability framework.

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Probabilistic structural analysis methods for improving Space Shuttle engine reliability

Journal of Propulsion and Power ◽

10.2514/3.23172 ◽

1989 ◽

Vol 5 (4) ◽

pp. 426-430 ◽

Cited By ~ 3

Author(s):

L. Boyce

Keyword(s):

Structural Analysis ◽

Space Shuttle ◽

Analysis Methods ◽

Engine Reliability

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Simulation of Probabilistic Wind Loads and Building Analysis

9th Biennial Conference on Reliability, Stress Analysis, and Failure Prevention ◽

10.1115/detc1991-0002 ◽

1991 ◽

Author(s):

Ashwin R. Shah ◽

Christos C. Chamis

Keyword(s):

Structural Response ◽

Computer Code ◽

Distribution Functions ◽

Wind Pressure ◽

Cumulative Distribution ◽

Wind Loads ◽

Cumulative Distribution Functions ◽

Load Spectra ◽

Design Life ◽

Building Geometry

Abstract Probabilistic wind loads likely to occur on a structure during its design life are predicted. This article describes a suitable multifactor interactive equation (MFIE) model and its use in the Composite Load Spectra (CLS) computer program to simulate the wind pressure cumulative distribution functions on four sides of a building. The simulated probabilistic wind pressure load was applied to a building frame, and cumulative distribution functions of sway displacements and concepts of reliability were demonstrated by computing the probability of overturning using NESSUS (Numerical Evaluation of Stochastic Structure Under Stress), a stochastic finite-element computer code. The geometry of the building and the properties of building members were also considered as random in the NESSUS analysis. The uncertainties of wind pressure, building geometry, and member section property were quantified in terms of their respective sensitivities on the structural response.

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Influence of the distribution of the shear walls on the seismic response of the buildings

Pollack Periodica ◽

10.1556/606.2020.15.1.4 ◽

2020 ◽

Vol 15 (1) ◽

pp. 37-44

Author(s):

El Mehdi Echebba ◽

Hasnae Boubel ◽

Oumnia Elmrabet ◽

Mohamed Rougui

Keyword(s):

Structural Analysis ◽

Seismic Response ◽

Natural Frequency ◽

Structural Design ◽

Structural Response ◽

Shear Walls ◽

Structural Elements ◽

Analysis Software ◽

Ansys Apdl ◽

The Impact

Abstract In this paper, an evaluation was tried for the impact of structural design on structural response. Several situations are foreseen as the possibilities of changing the distribution of the structural elements (sails, columns, etc.), the width of the structure and the number of floors indicates the adapted type of bracing for a given structure by referring only to its Geometric dimensions. This was done by studying the effect of the technical design of the building on the natural frequency of the structure with the study of the influence of the distribution of the structural elements on the seismic response of the building, taking into account of the requirements of the Moroccan earthquake regulations 2000/2011 and using the ANSYS APDL and Robot Structural Analysis software.

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