without acoustic material

with acoustic material

comparison 1: transmission

comparison 2: reflection

comparison 1: transmission

comparison 2: reflection

one-stage model

89% (4%)

114% (3%)

59% (4%)

83% (4%)

two-stage model

X = 35 mm

83% (4%)

110% (2%)

71% (3%)

87% (5%)

X = 25 mm

80% (4%)

125% (5%)

-

-

X = 15 mm

76% (6%)

130% (7%)

-

-

front-slope model

α = 15˚

84% (1%)

100% (6%)

71% (5%)

84% (8%)

α = 30˚

86% (3%)

109% (2%)

78% (4%)

96% (3%)

α = 45˚

86% (2%)

113% (2%)

74% (3%)

91% (3%)