Design of a tensegrity servo-actuated structure for civil applications

2021 ◽  
pp. 1-12
Author(s):  
Cecilia Scoccia ◽  
Luca Carbonari ◽  
Giacomo Palmieri ◽  
Massimo Callegari ◽  
Marco Rossi ◽  
...  
Keyword(s):  
Stress State ◽  
Finite Elements ◽  
Structural Performance ◽  
Tensegrity Structures ◽  
Simulated Environment ◽  
Realization Complexity ◽  
Different Levels ◽  
Finite Elements Model ◽  
Innovative Concept ◽  
Construction Practice

Abstract The use of glass elements in civil engineering is spreading in the last years beyond merely aesthetic functions for their ease of installation and production. Nonetheless, the structural performance of such materials in any condition of use is object of investigation. In this scenario, the paper analyses the performance of an innovative concept of tensegrity floor (Patent no 0001426973) characterized by a particular steel-glass adhesive junction that permits a profitable structural cooperation between such basically different materials. As known, at the base of the effectiveness of tensegrity structures lies the correct tensioning of metal strands which are devoted at keeping the rigid elements compressed. The tensioning level is then responsible of the actual deformation of the structure, which is of course of uttermost importance while speaking of civil applications. To address this issue with the adequate level of confidence required by construction practice, a mechatronic servo-system is proposed, aimed at maintaining, and modifying when needed, the stress state of the metal cables to adjust the deformation of the upper plane in response to varying loads. Three different actuation schemes, with different levels of realization complexity, are analysed and compared in simulated environment by means of a hybrid multibody-finite elements model.

Multibody Analysis of a Tensegral Servo-Actuated Structure for Civil Applications

2021 ◽  
Author(s):  
Cecilia Scoccia ◽  
Giacomo Palmieri ◽  
Massimo Callegari ◽  
Marco Rossi ◽  
Luca Carbonari ◽  
...  
Keyword(s):  
Stress State ◽  
Civil Engineering ◽  
Servo System ◽  
Structural Performance ◽  
Adequate Level ◽  
Simulated Environment ◽  
Realization Complexity ◽  
Different Levels ◽  
Innovative Concept ◽  
Construction Practice

Abstract The use of glass elements in civil engineering is spreading in the last years beyond merely aesthetic functions for their ease of installation and production. Nonetheless, the structural performance of such materials in any condition of use is object of investigation. In this scenario, the paper analyses the performance of an innovative concept of tensegrity floor (Patent no 0001426973) characterized by a particular steel-glass adhesive junction that permits a profitable structural cooperation between such basically different materials. As known, at the base of the effectiveness of tensegral structures lies the correct tensioning of metal strands which are devoted at keeping the rigid elements compressed. The tensioning level is then responsible of the actual deformation of the structure, which is of course of uttermost importance while speaking of civil applications. To address this issue with the adequate level of confidence required by construction practice, a mechatronic servo-system is proposed, aimed at maintaining, and modifying when needed, the stress state of the metal cables to adjust the deformation of the upper plane in response to varying loads. Three different actuation schemes, with different levels of realization complexity, are analysed and compared in simulated environment by means of a hybrid multibody-finished elements mode.

A nonsteady-state finite-elements model of the temperature field in the direct electric heating of a powder mixture

1988 ◽  
Vol 27 (3) ◽  
pp. 185-189
Author(s):  
A. I. Tsitrin ◽  
V. Ya. Belousov ◽  
A. V. Pilipchenko ◽  
A. N. Khomchenko ◽  
L. D. Lutsak
Keyword(s):  
Temperature Field ◽  
Finite Elements ◽  
Powder Mixture ◽  
Electric Heating ◽  
Nonsteady State ◽  
Finite Elements Model

A Semi-Analytical Investigation of Fatigue Stresses in a Bolted Headplate by Finite Elements and Classical Plate Theory

1987 ◽  
Vol 109 (3) ◽  
pp. 302-308
Author(s):  
A. J. McPhate ◽  
G. Steven Gipson ◽  
J. C. Ortiz
Keyword(s):  
Stress State ◽  
Finite Elements ◽  
Ball Mill ◽  
Plate Theory ◽  
Analytical Investigation ◽  
Hybrid Analysis ◽  
Early Failure ◽  
Classical Plate Theory ◽  
Analysis Techniques ◽  
Manufacturing Errors

A semi-analytical analysis involving finite elements in conjunction with classical plate theory is used to determine the stress state in a concentrated region of the headplate on an industrial ball mill. The study illustrates the practical benefits of combining analysis techniques. With this procedure, manufacturing errors in the mill design and construction are confirmed to be a facing cut and a series of nonstructural welds on a wrapper plate between the headplate and its bearing bell mounting. The early failure of the ball mill is shown to arise from the combined detrimental effects of the residual stresses formed in the welds and groupings of broken bolts in the headplate assembly. The result, confirmed by actual site examinations, is an emphatic positive verification of the merits of hybrid analysis methods, when applied in a rational manner.

Prediction of Rail Profile Wear with the Increase of Vehicle Speed

2013 ◽  
Vol 716 ◽  
pp. 659-662
Author(s):  
Dong Hyong Lee ◽  
Jeong Won Seo ◽  
Seok Jin Kwon ◽  
Ha Young Choi
Keyword(s):  
Numerical Analysis ◽  
Finite Elements ◽  
Boundary Conditions ◽  
Rolling Contact ◽  
Finite Elements Method ◽  
Vehicle Speed ◽  
Two Dimensional ◽  
Contact Wear ◽  
Rail Wear ◽  
Finite Elements Model

A method to simulate rolling contact wear in a rail surface was developed using the finite elements method and numerical analysis. A two-dimensional finite elements model was used in order to reduce the calculation time and boundary conditions to prevent excessive deformation of a wheel and a rail were applied. A numerical analysis of rail wear at rolling contact was predicted using the Archards equation. In addition, the characteristics of rail wear with the increasing speed of vehicle were analyzed. Results show that there was not a large difference in the depths of wear on the rail head with increasing vehicle speed, but the wear on the rail gauge corner increased with increasing vehicle speed.

scholarly journals Análise numérica de ligação parafusada semirrígida em perfis formados a frio

ForScience ◽  
2019 ◽  
Vol 7 (2) ◽  
Author(s):  
Emerson Cardoso de Castro ◽  
Flávio Teixeira de Souza ◽  
Arlene Maria Cunha Sarmanho
Keyword(s):  
Numerical Analysis ◽  
Numerical Model ◽  
Finite Elements ◽  
Three Dimensional ◽  
Structural Performance ◽  
Similar Tendency ◽  
Von Mises ◽  
Von Mises Stresses ◽  
Bolt Connection ◽  
Force Displacement

O presente trabalho constitui-se de uma análise numérica, por meio de elementos finitos, objetivando a reprodução via software de um ensaio experimental de ligação parafusada semirrígida em perfis formados a frio, dada no âmbito tridimensional. A análise consistiu-se a partir da reprodução da geometria do protótipo, das condições de contorno e aplicação de carregamento. Para melhor previsão do comportamento da ligação, foram inseridas ao modelo a não linearidade física e geométrica. Foram obtidas as curvas força-deslocamento e a evolução das tensões de Von Mises para os diferentes componentes do protótipo. Os resultados indicaram que o modelo numérico é cerca de duas vezes mais rígido que o experimental. Todavia, foi possível observar que o comportamento do modelo numérico possui tendência similar ao do modelo experimental e também foi possível avaliar a contribuição dos elementos da ligação para o desempenho da mesma.Palavras-chave: Análise numérica. Ligação parafusada semirrígida. Perfis formados a frio. Desempenho estrutural.Numerical analysis of semi-rigid bolt connection in cold formed profilesAbstractThe current paper is based on a numerical analysis by means of finite elements aiming at the software reproduction of an experimental test of semi-rigid bolt connection in cold formed profiles occurred in the three-dimensional scope. The analysis consisted of the reproduction of the prototype geometry, the boundary conditions, and the loading application. For a better forecast of the connection behavior, physical and geometric non-linearity were inserted to the model. The force-displacement curves and the evolution of the Von Mises stresses for the different prototype components were obtained. The results indicated that the numerical model is about twice as rigid as the experimental one. However, it was possible to observe that the behavior of the numerical model has a similar tendency  if compared to  the experimental model and it was still possible to evaluate the contribution of the connection elements to its performance.Keywords: Numerical analysis. Semi-rigid bolt connection. Cold-formed profiles. Structural performance.

scholarly journals DEFINITION OF SAFETY FACTOR VOLUMETRIC FINITE ELEMENTS UNDER TRIAXIAL STRESS STATE

2016 ◽  
Vol 6 (2) ◽  
pp. 24-27
Author(s):  
E.S. Sibgatullin ◽  
◽  
O.G. Novoselov ◽  
K.E. Sibgatullin ◽  
◽  
...  
Keyword(s):  
Stress State ◽  
Finite Elements ◽  
Safety Factor ◽  
Triaxial Stress ◽  
Triaxial Stress State ◽  
Definition Of
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