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Algoritmus pro nelineární nejmenší čtverce
Balda, Miroslav
The contribution deals with a problem of experimental data processing by a least squares approach. A Matlab function based on Fletcher's version of Levenberg-Marquardt method has been implemented and tested even for a constrained problem
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Fatigue strength and life of real structures under combined random loading
Svoboda, Jaroslav ; Balda, Miroslav ; Fröhlich, Vladislav
A rather often kind of combined stress is a case, when one of its components acts statically. The contribution deals with some rsults of research works,the goal of which has been to reveal an influence of the static component on a resulting fatigue life, and to find a way of its including into fatigue strength evalutions. A procedure for finding a critical stress for an estimating of a structure save life is presented. Unfortunately, the fatigue life calculation is more complicated and needs some experiments, which will yield additional informstion on a material behaviour under required stress combination and levels.
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Generating a special loading processes
Balda, Miroslav
New computing methods for assessment of fatigue lives of machine parts exposed to combined stress should be tested. With a view to it, fatigue experiments are pursued with predefined periodic processes compounded of deterministic time functions of normal and shear stresses. A straight application of simple functions leads to improper results due to dynamic properties of the testing machine. The contribution describes a way of generating loading processes of much better properties.
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