2014
DOI: 10.1108/mmms-04-2014-0019
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Optimal control during drilling in GFRP composite laminates

Abstract: Purpose -Damage due to delamination is an important issue during drilling in polymer-matrix composites (PMCs). It depends on thrust force and torque which are functions of feed rate. Transfer function of thrust force with feed rate and torque with feed rate is constructed through experiments. These transfer functions are then combined in state-space to formulate a sixth-order model. Then thrust force and torque are controlled by using optimal controller. The paper aims to discuss these issues. Design/methodolo… Show more

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Cited by 4 publications
(4 citation statements)
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“…Equation (6) is solved to obtain response of thrust force at different feed-rates. [45][46][47] Control law for optimal tracking of critical thrust force Thrust force is taken as output from the system model as shown in equation (7) Y…”
Section: Mathematical Modeling Of Drillingmentioning
confidence: 99%
See 1 more Smart Citation
“…Equation (6) is solved to obtain response of thrust force at different feed-rates. [45][46][47] Control law for optimal tracking of critical thrust force Thrust force is taken as output from the system model as shown in equation (7) Y…”
Section: Mathematical Modeling Of Drillingmentioning
confidence: 99%
“…Optimal feed-rate during drilling, that produces thrust force corresponding to reference thrust force profile, is calculated using equation (14). Putting optimal feed-rate given by equation (14) in equation (5), optimal thrust force resulting due to tracking of given reference signal becomes 47–49…”
Section: Control Law For Optimal Tracking Of Critical Thrust Forcementioning
confidence: 99%
“…By drilling the composite laminate at an appropriate constant feed rate or by appropriately controlling the feed rate, delaminationfree drilling can be achieved. [49][50][51][52][53] Thrust force is dependent on the feed rate used during drilling and it increases with increase in feed rate. Large thrust force is accounted as a major reason behind push-out delamination.…”
Section: Introductionmentioning
confidence: 99%
“…Epoxy and epoxy-based composites are widely used for mechanical applications in aerospace, automobile, marine industry, etc., due to their light weight, better strength and ease of processing. 1 Loading of the structural materials require high modulus, hardness, and toughness for safety and better product life. Failure initiated by crack propagation due to loading in material parts containing flaws requires improved fracture resistance of the material.…”
Section: Introductionmentioning
confidence: 99%