Síntesis Genética de Mecanismos para Aplicaciones en Prótesis de Miembro Inferior

Merchán-Cruz, Emmanuel Alejandro; Lugo-González, Esther; Ramírez-Gordillo, Javier; Rodríguez-Cañizo, Ricardo Gustavo; Pineda, Juan Manuel Sandoval; Hernández-Gómez, Luis Héctor

doi:10.1016/s1697-7912(11)70025-5

Cited by 7 publications

(4 citation statements)

References 19 publications

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“…Quintero et al [18] study the synthesis of path generation and body guide using four and six-bar linkage mechanisms. Genetic algorithms are also used in other kind of study; for example in the design of spherical parallel manipulators [24] in the design of crowned cylindrical roller bearings [13] estimation in-situ rock elastic constants by acoustic reflection records [16], deposition of thin copper films on flat surfaces of polypropylene polymer, [7], calculation of reconfiguration patterns for Photovoltaic Arrays [4], analysis of the requirements of an assembly line and paint shop to determinate the scheduling order of vehicles in a production day [10], in the design of the prosthesis of a lower limb [15], in the design of displacement law of noncircular gear [19]. In this article, a redesign of the door opening and closing mechanism present in public transport bus is proposed, with the goal of solving a real engineering problem.…”

Section: Figure 1 Opening and Closing Mechanismmentioning

confidence: 99%

Optimization of the opening and closing mechanism of an urban bus door using genetic algorithm

Riaza¹,

Aldana²,

Montilla³

et al. 2018

ces

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Public transport vehicles require cyclic loading in their mechanical systems, which generally leads to the implementation of short-term maintenance plans and compels their manufacturers or owners to pay high monetary costs. One of these systems is the door opening and closing mechanism. High forces tend to be applied 3356 Héctor F. Quintero et al. for this mechanism, causing problems in its components and, hence, malfunction in a shorter period of time. This paper shows the redesign of a door opening and closing mechanism in which an optimization process is implemented based on genetic algorithms; the objective variable being the improvement of the mechanism's transmission angle. In this document, a comparative kinetostatic analysis of both the original and the redesigned mechanisms is carried out through a multi-body dynamics simulation. The results found in the simulation point out that the reactions of the proposed mechanism are reduced. In the experimental part of this work, a prototype of the designed mechanism was built and subjected to cyclic closing and opening operations. The results of this practice confirmed the advantages of the designed mechanism.

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Section: Figure 1 Opening and Closing Mechanismmentioning

confidence: 99%

Optimization of the opening and closing mechanism of an urban bus door using genetic algorithm

Riaza¹,

Aldana²,

Montilla³

et al. 2018

ces

View full text Add to dashboard Cite

show abstract

“…Pfeifer et al [17] optimized a four-bar joint, where a ball screw was placed behind the knee joint from which the power profile of an acted knee prosthesis was investigated, the profile depends on the angle of the joint and the joint speed, and normal gait requirements depend on the selected data such as appropriate components and geometry optimization. In 2011, Merchan-Cruz et al [18] studied the case of the optimization of the genetic algorithm of a mechanism with six bars, and Zohoor et al in 2012 [19] also presented an optimization procedure for the synthesis of a six-bar mechanism. In 2018, Eqra et al [20] used an optimal synthesis to generate trajectories using particle swarm optimization (PSO).…”

Section: Introductionmentioning

confidence: 99%

Performance comparison and design of an optimal polycentric knee mechanism

Soriano

Rodríguez

Valencia

2020

J Braz. Soc. Mech. Sci. Eng.

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In the present work, several mechanisms of four bars for knee prosthesis were studied and evaluated. We compared and defined the design parameters as well as an optimization method in terms of their stability and voluntary control to get a new mechanism. Few methods have been published to compare the performance and design parameters of the wide variety of polycentric knee mechanisms. In this work, we developed a method for performance comparison of polycentric knee mechanisms and designing a stable and novel four-bar mechanism with a voluntary control configuration. We defined design parameters for the optimization of a stable knee mechanism with voluntary control, presented a new dimensional design that can be functional for transfemoral users with different anthropometric characteristics and contributed with a simple method to obtain a mechanism with optimal sizing. A comparison of dimensional parameters of several mechanisms of knee prosthesis was obtained. There is the proposal of a new optimized mechanical configuration for assuring the voluntary control and a stable trajectory of the knee mechanism. With this method, it is possible to compare and design personalized mechanisms. Clinical relevance This method proposes a simple way to evaluate polycentric knees, and it is easy to use to compare and design stable mechanisms with voluntary control for transfemoral users with personal design parameters, if required.

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“…Quintero et al [21] extended the scope of the method to the synthesis of a six-bar mechanism, Chen and Chou [4] applied genetic algorithms to the optimization of a six-bar mechanism required for a metal molding industry, taking consideration of workspace and collision avoidance restrictions. Merchan et al [17] applied an optimization process for the synthesis of a polycentric knee prosthesis based on Watt's six-bar linkage planar mechanism. Zhang and Nelson [30] implemented a multi-objective kinematical optimization process in the design of a serial spherical mechanism using genetic algorithms.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of a variable stroke slider crank mechanism for a reciprocating internal combustion engine

Castañeda¹,

Romero²,

Riaza³

2018

ces

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From its inception, the internal combustion engine has evolved in small and sometimes great leaps, driven by constructive, technological and exploitation implementations that have allowed it to meet consumer expectations as well as environmental and fuel consumption regulations. Spark ignited engines have lower performance under low loads compared to Diesel engines, the biggest difference between them being the compression ratio, limited in the first ones by the risk of the detonation occurrence. The introduction of mechatronics developments in spark ignited engines have contributed to their performance improvement through the 5128 Edison Henao Castañeda et al. controlled variation of ignition and valve events (timing and lift), controlled variation of intake manifold length and volume, exhaust gas recirculation, and variable supercharging systems, among other technological strategies. Of all the constructive alternatives, the biggest impact on engine performance lies in compression ratio, and the control of its variation becomes one of the main research goals for engine manufacturers. In this paper, some of the constructive efforts, reported in literature, to obtain mechanisms and systems for the control of compression ratio of internal combustion engines are overviewed, with the main goal of presenting the methodology for the optimized synthesis of a multi-link variable compression ratio mechanism, designed to be assembled in a commercial single cylinder stationary Diesel engine as a fundamental equipment of an octane rating test bench for different fuel blends tested. The synthesis technique presented in the paper develops the range of motion for the six links Stephenson mechanism, applies a method of synthesizing the output slider trajectory, and analyzes the mechanism performance in terms of slider stroke variation range. It is shown that compression ratios resulted from slider variations can be kept between 10 and 17,5, a range sufficient to study commercial engine fuels, a utilitarian goal pursued.

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Síntesis Genética de Mecanismos para Aplicaciones en Prótesis de Miembro Inferior

Cited by 7 publications

References 19 publications

Optimization of the opening and closing mechanism of an urban bus door using genetic algorithm

Optimization of the opening and closing mechanism of an urban bus door using genetic algorithm

Performance comparison and design of an optimal polycentric knee mechanism

Synthesis of a variable stroke slider crank mechanism for a reciprocating internal combustion engine

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