Abstract
This work deals with the multi-objective robust design optimization of a needle-bar-and-thread-take-up-lever (NBTTL) mechanism used in sewing machines. A multi-objective imperialist competitive algorithm combined with the Monte Carlo method is developed and used for the robust multi-objective optimization of the NBTTL mechanism. This robust optimization minimizes simultaneously the needle jerk, the maximum angular velocity ratio and their standard deviations when the design parameters are known with a given uncertainty. By comparison with Juki 8700, the obtained results showed that the developed algorithm can give a robust design of a sewing machine with the same performance as the those obtained by deterministic methods but less sensitive to the design parameters uncertainties.
Highlights
Many researchers focused on optimizing the designs of sewing machines in order to improve their mechanical performances
This paper deals with the multi-objective robust design optimization of the NBTTL mechanism used in sewing machines
Using the multiobjective imperialist competitive algorithm (MOICA) algorithm, the Pareto front (Fig. 6) can be determined to find the optimal non-dominated solutions of the multi-objective optimization problem defined by equation (10) under the constraint presented by equation (11)
Summary
Many researchers focused on optimizing the designs of sewing machines in order to improve their mechanical performances. Komarec et al [3] develop a mono-objective optimization of the needle transfer mechanism by means of the software Pro/Engineer Wildfire 4 with the aim to obtain a reduction of needle wear It is a common practice in sewing machine design optimization to consider the nominal value of DPs as input variables. Kalantari et al [9] have developed a hybrid robust evolutionary algorithm by combining the NSGA-II process with a local search method This strategy is used to optimize composite structures under an uncertain fibre angle and a lamina thickness. This paper deals with the multi-objective robust design optimization of the NBTTL mechanism used in sewing machines.
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