Mathematical Modeling of Multiple Quality Characteristics of a Laser Microdrilling Process Used in Al7075/SiC_p Metal Matrix Composite Using Genetic Programming

Table 1

Parameter setting for genetic programming.

Parameters	Value assigned
Population size (P)	500
Number of generations	1000
Maximum depth of tree	6
Maximum generation	50
Functional set	Multiply, plus, minus, divide
Terminal set	(v1, v2, v3, v4, v5, v6, −10, 10)
Number of runs	110
Mutation rate	0.10
Crossover rate	75% nonhomologous
	25% homologous
Reproduction rate	0.05
Fitness, r^2	The square root of the sum of the square of absolute value of the differences (errors), between the program’s output and the observed data.
Termination	An individual emerges whose sum of absolute errors is less than specified: (a) required number of runs be completed or (b) required correlation coefficient is obtained
Terminal set	T = {P, random-constants}