Volume 15, Issue 12 (2016)                   Modares Mechanical Engineering 2016, 15(12): 37-45 | Back to browse issues page

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Alisadeghi M, Fazilati J. Optimization of honeycomb impact attenuator using genetic algorithm based on response surface method and design of experiment; Part II: Optimization. Modares Mechanical Engineering. 2016; 15 (12) :37-45
URL: http://journals.modares.ac.ir/article-15-7226-en.html
Abstract:   (2548 Views)
In this study, honeycomb energy absorber is optimized using genetic algorithm. The design goal is to absorb whole impact energy within a ‎limited shock load level. First the crashworthiness and parameter sensitivity of honeycomb structure is extracted as explicit functions that ‎are utilized to find optimized shock absorber configuration. Energy absorber must depreciate the impact kinetic energy and mitigate its ‎defects on the structure and aboard. So the energy absorption capacity while the shock load is kept limited are the main design objectives. ‎The volume and mass restrictions are also important objectives from an application point of view. Based on the simulation results ‎available in the article Part I, the honeycomb response surfaces of crashworthiness parameters including the mean and peak crushing ‎stresses are extracted. Utilizing the genetic algorithm based on response functions, the multi-objective optimized energy absorber is ‎investigated. The main objective of the optimization problem is set to minimization of mass or volume while the maximum allowable shock ‎and minimum energy absorption capacity are included as the problem constraints. The geometric specifications of honeycomb structure ‎including cell-size, foil thickness, height and absorber face area are among the design variables with optimization outputs of energy ‎absorption capacity, volume, mass, and shock level. Some optimization results are compared with those available in the literature and a ‎typical problem is handled. Results show that mass and volume optimized geometries are almost similar and reduction of acceptable shock ‎level makes the optimized geometry height to rise.‎
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Article Type: Research Article | Subject: Impact Mechanics
Received: 2015/06/28 | Accepted: 2015/10/8 | Published: 2015/11/11

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