Influence of dynamic loads on the optimum design of trusses

Binary-code genetic algorithms (BGA) have been used to obtain the optimum design for deep groove ball bearings, based on maximum fatigue life as an objective function. The problem has ten design variables and 20 constraint conditions. This method can find better basic dynamic loads rating than those listed in standard catalogues. However, the BGA algorithm requires a tremendous number of evaluations of the objective function per case to achieve convergence (e.g. about 5 200 000 for a representative case). To overcome this difficulty, a hybrid evolutionary algorithm by combining real-valued genetic algorithm (GA) with differential evolution (DE) is used together with the proper handling of constraints for this optimum design task. Findings show that the GA—DE algorithm can successfully find the better dynamic loads rating, about 1.3—11.1 per cent higher than those obtained using the traditional BGA. Moreover, the mean number of evaluations of the objective function required to achieve convergence is about 3011, using the GA—DE algorithm, as opposed to about 5 200 000 for a representative case using the BGA. Comparison shows the GA—DE algorithm to be much more effective and efficient than the BGA.

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Optimum design criteria for elastic structures subject to random dynamic loads

Engineering Optimization ◽

10.1080/03052150600913028 ◽

2006 ◽

Vol 38 (7) ◽

pp. 853-871 ◽

Cited By ~ 20

Author(s):

Giuseppe Carlo Marano ◽

Francesco Trentadue ◽

Rita Greco

Keyword(s):

Optimum Design ◽

Dynamic Loads ◽

Design Criteria ◽

Elastic Structures

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Dynamic Loads and Different Soil Characteristics Examination on Optimum Design of Cantilever Retaining Walls Utilizing Harmony Search Algorithm

International Journal Of Engineering & Applied Sciences ◽

10.24107/ijeas.1033802 ◽

2021 ◽

Vol 13 (4) ◽

pp. 140-154

Author(s):

Esra URAY ◽

Serdar ÇARBAŞ

Keyword(s):

Optimum Design ◽

Search Algorithm ◽

Harmony Search ◽

Retaining Walls ◽

Soil Characteristics ◽

Harmony Search Algorithm ◽

Dynamic Loads ◽

Cantilever Retaining Walls

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Optimum Design of Reinforced Concrete Retaining Walls Under Static and Dynamic Loads Using Jaya Algorithm

Advances in Intelligent Systems and Computing - Proceedings of 6th International Conference on Harmony Search, Soft Computing and Applications ◽

10.1007/978-981-15-8603-3_17 ◽

2020 ◽

pp. 187-196

Author(s):

Nur Yılmaz ◽

Sena Aral ◽

Sinan Melih Nigdeli ◽

Gebrail Bekdaş

Keyword(s):

Reinforced Concrete ◽

Optimum Design ◽

Retaining Walls ◽

Dynamic Loads ◽

Jaya Algorithm ◽

Static And Dynamic Loads

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Optimum Design of Digital Control Systems

10.1016/s0076-5392(08)x6073-4 ◽

1963 ◽

Keyword(s):

Control Systems ◽

Optimum Design ◽

Digital Control ◽

Digital Control Systems

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Study of the dynamics of ТПА 350 automatic mill working stand elements

Ferrous Metallurgy Bulletin of Scientific Technical and Economic Information ◽

10.32339/0135-5910-2020-8-830-840 ◽

2020 ◽

Vol 76 (8) ◽

pp. 830-840

Author(s):

S. R. Rakhmanov ◽

V. V. Povorotnii

Keyword(s):

Mechanical System ◽

Dynamic Model ◽

Maximum Amplitude ◽

Calculation Scheme ◽

Dynamic Loads ◽

Forced Oscillations ◽

Mass Model ◽

Automatic Mill ◽

Hollow Billet ◽

Oscillation Movement

To form a necessary geometry of a hollow billet to be rolled at a pipe rolling line, stable dynamics of the base equipment of the automatic mill working stand has a practical meaning. Among the forces, acting on its parts and elements, significant by value short-time dynamic loads are the least studied phenomena. These dynamic loads arise during transient interaction of the hollow billet, rollers, mandrel and other mill parts at the forced grip of the hollow billet. Basing of the calculation scheme and dynamic model of the mechanical system of the ТПА 350 automatic mill working stand was accomplished. A mathematical model of dynamics of the system “hollow billet (pipe) – working stand” within accepted calculation scheme and dynamic model of the mechanical system elaborated. Influence of technological load of the rolled hollow billet variation in time was accounted, as well as variation of the mechanical system mass, and rigidity of the ТПА 350 automatic mill working stand. Differential equations of oscillation movement for four-mass model of forked sub-systems of the automatic mill working stand were made up, results of their digital calculation quoted. Dynamic displacement of the stand elements in the inter-roller gap obtained, which enabled to estimate the results of amplitude and frequency characteristics of the branches of the mill rollers setting. It was defined by calculation, that the maximum amplitude of the forced oscillations of elements of the ТПА 350 automatic mill working stand within the inter-roller gap does not exceed 2 mm. It is much higher than the accepted value of adjusting parameters of the deformation center of the ТПА 350 automatic mill. A scheme of comprehensive modernization of the rollers setting in the ТПА 350 automatic mill working stand was proposed. It was shown, that increase of rigidity of rollers setting in the ТПА 350 automatic mill working stand enables to stabilize the amplitude of forced oscillations of the working stand elements within the inter-rollers gap and considerably decrease the induced nonuniform hollow billet wall thickness and increase quality of the rolled pipes at ТПА 350.

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