Aiming at problems of optimal placement of sensor of gelatinize agency belongs to paper and yarn compounded bag bottom-pasting machine for health inspection

an improved monkeys algorithm（ MA） is proposed.Modal assurance criterion（ MAC） matrix is used as objective function

enhance the diversity of monkeys by using normal distribution methods to construct initial population; adaptive changeable climbing step is used to improve running speed and solving presition of the algorithm. Carry out optimal placement of sensor based on results of analysis on gelatinize agency finite element modal

the results verify that the improved algorithm can solve the problem and has better searching capability and high convergence presition compared with simple monkey algorithm（ SMA）.