International Journal of Aerospace Engineering / 2019 / Article / Tab 5

Research Article

Study of Manufacturing Process of Holes in Aeroengine Heat Shield

Table 5

Variance analysis table.

FactorsSum of squares of variance ()Degrees of freedom ()-ratio critical valueSignificant

1800336.7329.5
1969340.1829.5
493129.5
4593393.7329.5
1553331.6929.5
Error493

Note: is used as the error term. The -ratio in the table is the ratio of the squared sum of the variance of each factor and the error. The critical value of the -ratio greater than is significant. According to the size of the -ratio, the influence degree of each factor on the quality of laser cutting is obtained as follows: . The conclusion of the ANOVA was consistent with the result obtained in Table 4 in the intuitive analysis, which further proves the correctness of the intuitive analysis. It can be seen in Table 5 that , , , and play a leading role in the laser cutting process, and they do not interfere with test error and interaction. The effect of current was not significant compared with the other four parameters; however, it is consistent with current floating with the intuitive analysis.

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