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Full-Text Articles in Engineering
A New Preloaded Beam Geometric Stiffness Matrix With Full Rigid Body Capabilities, Paul A. Bosela, D. G. Fertis, F. J. Shaker
A New Preloaded Beam Geometric Stiffness Matrix With Full Rigid Body Capabilities, Paul A. Bosela, D. G. Fertis, F. J. Shaker
Civil and Environmental Engineering Faculty Publications
Space structures, such as the Space Station solar arrays, must be extremely light-weight, flexible structures. Accurate prediction of the natural frequencies and mode shapes is essential for determining the structural adequacy of components, and designing a controls system. The tension pre-load in the 'blanket' of photovoltaic solar collectors, and the free/free boundary conditions of a structure in space, causes serious reservations on the use of standard finite element techniques of solution. In particular, a phenomenon known as 'grounding, or false stiffening, of the stiffness matrix occurs during rigid body rotation. The authors have previously shown that the grounding phenomenon is …
Grounding Of Space Structures, Paul A. Bosela, D. G. Fertis, F. J. Shaker
Grounding Of Space Structures, Paul A. Bosela, D. G. Fertis, F. J. Shaker
Civil and Environmental Engineering Faculty Publications
Space structures, such as the Space Station solar arrays, must be extremely light-weight, flexible structures. Accurate prediction of the natural frequencies and mode shapes is essential for determining the structural adequacy of components, and designing a controls system. The tension pre-load in the 'blanket' of photovoltaic solar collectors, and the free/free boundary conditions of a structure in space, causes serious reservations on the use of standard finite element techniques of solution. In particular, a phenomenon known as 'grounding', or false stiffening, of the stiffness matrix occurs during rigid body rotation. This paper examines the grounding phenomenon in detail. Numerous stiffness …
Dynamic Analysis Of Space-Related Linear And Nonlinear Structures, Paul A. Bosela, F. J. Shaker, D. G. Ertis
Dynamic Analysis Of Space-Related Linear And Nonlinear Structures, Paul A. Bosela, F. J. Shaker, D. G. Ertis
Civil and Environmental Engineering Faculty Publications
In order to be cost-effective, space structures must be extremely light-weight, and subsequently, very flexible structures, The power system for Space Station 'Freedom' is such a structure. Each array consists of a deployable truss mast and a split 'blanket' of photo-voltaic solar collectors. The solar arrays are deployed in orbit, and the blanket is stretched into position as the mast is extended. Geometric stiffness due to the preload make this an interesting non-linear problem. The space station will be subjected to various dynamic loads, during shuttle docking, solar tracking, attitude adjustment, etc. Accurate prediction of the natural frequencies and mode …
Reliability Analysis Of Structural Ceramic Components Using A Three-Parameter Weibull Distribution, Stephen F. Duffy, Lynn M. Powers, Alois Starlinger
Reliability Analysis Of Structural Ceramic Components Using A Three-Parameter Weibull Distribution, Stephen F. Duffy, Lynn M. Powers, Alois Starlinger
Civil and Environmental Engineering Faculty Publications
This paper describes nonlinear regression estimators for the three-parameter Weibull distribution. Issues relating to the bias and invariance associated with these estimators are examined numerically using Monte Carlo simulation methods. The estimators were used to extract parameters from sintered silicon nitride failure data. A reliability analysis was performed on a turbopump blade utilizing the three-parameter Weibull distribution and the estimates from the sintered silicon nitride data.