Application of entropy weighted multivariate loss function for control of process parameters during drilling hybrid composites

¹ Mechanical Engineering Department, IMPACT college of Engineering & Applied Sciences, Kodigehalli, Sahakaranagar south, Bangalore, 560092, Karnataka, India
² Mechanical Engineering Department, CVR College of Engineering, Ibrahimpatnam, Hyderabad, 501510, Telangana, India
³ Geethanjali College of Engineering and Technology, Hyderabad, 501301, Telangana, India

^* Corresponding author: jalumedi.babu@gmail.com, dr.jalumedibabu.fac@iceas.ac.in

Published online: 7 January 2026

Abstract

Composites are now being used to replace traditional metallic structures in a variety of industries that including aerospace, aircraft, and military, that demand structural materials of high stiffness-to-weight and strength-to-weight ratios. This work is aimed at investigation on drilling process parameters of a hybrid composite. A hybrid composite is prepared with Epoxy as matrix with Jute and Glass fibre reinforced material. It is attempted to investigate the delamination tendency of hybrid composite along with optimization of drilling parameters. The two parameters considered are speed and feed rate. Each of this is considered at 3 levels. Response characteristics are thrust force, torque, delamination factor. L9 orthogonal array will be considered for experimentation. Standard Analysis is performed to discriminate significant and insignificant factors. Optimized process parameters are obtained for each of response characteristics. The objective is to optimize drilling process parameters of a hybrid compositeTaguchi’s L9 3-level orthogonal array was employed in this work. Entropy weighted multivariate loss function optimizes the multi-responses with a single desired response for drilled hybrid composites at the common factor level. Spindle speed and feed rate operate as control elements, the responses are dependent on torque, thrust force, and delamination. Medium spindle speeds with smaller feed rates enhance drilling success, according to the findings. The results also showed that spindle speed has a higher influence on the quality of holes drilled.