Research on Multiobjective Optimization of Bulb Tubular Turbine Based on Orthogonal Test

Table 10

Maximum amplitude of pressure pulsation at each monitoring point before and after optimization.

Monitoring points		A1–A4	B1–B4	C1–C4	D1–D4
Before optimization	Frequency/Hz	3 fn	3 fn	3 fn	0.167 fn
	Amplitude/%	0.591	5.121	1.741	0.656
Optimized	Frequency/Hz	3 fn	3 fn	0.167 fn	0.167 fn
	Amplitude/%	0.308	1.375	0.512	0.484