An Optimization Method for Maximizing the Low Frequency Sound Insulation of Plate Structures

Table 3

Known parameters and optimization of Case 2.

(a)

Known; parameters	Density	Young’s modulus	Poisson’s ratio	Damping factor	Lx	Ly
	2500kg/m^3	65GPa	0.25	0.01	1m	0.6m

(b)

Constraints	Boundary condition	Boundary parameter
		Variable Range	10^3~	0~
	Plate thickness	Variable Range	5~15mm (being an integer multiple of 1 mm)

(c)

Target	Maximize
Results	Optimal boundary condition	,
	Optimal plate thickness	8mm
	Optimal	31dB

Note: for comparison, the LFSTCO&N results of the reference plate (the same plate but with 15 mm thickness) with SSSS and CCCC boundary conditions are 25 dB and 28 dB, respectively.

(d)

Target	Maximize
Results	Optimal Boundary condition	,
	Optimal plate thickness	15mm
	Optimal	32dB

Note: for comparison, the results of the reference plate (the same plate but with 15 mm thickness) with SSSS and CCCC boundary conditions are 25 dB and 28 dB, respectively.