Near-Field Measurements of Water-Entry Sound of Low-Speed Metal Balls in a Non-Anechoic Tank

Table 1

Experimental conditions.

Experiment	Working conditions	Parameters
1	Virtual-source integration in time domain for near-field validation	Entry angle θ = 90°
		Horizontal measuring distance L = 0.45 m
		Entry speed  = 9.02 m/s
		Ball size D = 6, 8, 10, 12 mm
2	Fixed ball size, different entry speeds in near-field	Ball size D = 8 mm
		Entry speed  = 5.89, 6.37, 6.82, 7.14, 7.54, 7.92 m/s
		Entry angle θ = 90°
		Horizontal measuring distance L = 0.45 m
3	Fixed entry speed, different ball sizes in near-field	Ball size D = 4, 6, 8, 10, 12, 14, 16, 18, 20 mm
		Entry speed  = 5.89 m/s
		Entry angle θ = 90°
		Horizontal measuring distance L = 0.45 m