1 Introduction
2 Literature Review
3 Research Method: Overview of the Field Test
3.1 Material Properties and Characteristics
3.2 Test Site Description
3.3 Measurement and Evaluation
Measurement devices | Model and manufacturer |
---|---|
Standardised floor impact | |
Lightweight floor impact sound source (tapping machine) | Norsonic, N-211A, France |
Heavyweight floor impact sound source (bang machine) | SNVT |
Sound receiver and reverberation time measurement devices | |
Real time analyser | RION Co., LTD., SA-30, Japan |
Sound level calibrator | RION Co., LTD., NC-74, Japan |
Microphone set | RION Co., LTD., UC-53A, Japan |
Sound power source | PISTOL |
Frequency (Hz) | 63 | 125 | 250 | 500 | 1000 | 2000 |
Sound pressure level (dB) | 45.5 | 39.6 | 37.5 | 34.2 | 31.4 | 31.7 |
Size of the room | Width (m) × length (m) × height (m) |
---|---|
Measurements of the receiver room | 3.4 × 6.7 × 2.5 |
Frequency (Hz) | Reverberation time (s) |
---|---|
125 | 0.80 |
250 | 0.86 |
500 | 0.91 |
1000 | 1.09 |
2000 | 1.10 |
3.4 Evaluation Method of the Floor Impact Sound Insulation
4 Results and Discussions
4.1 Analysis of the Insulation Performance of the Floor Impact Sound
Frequency (Hz) | Measured value (dB) | Normalised floor impact sound level (dB) | Reverse A characteristic curve (dB) |
---|---|---|---|
125 | 53.2 | 53.8 | 60 |
250 | 54.7 | 55.0 | 53 |
500 | 51.3 | 51.3 | 47 |
1000 | 47.1 | 46.3 | 44 |
2000 | 36.4 | 35.6 | 43 |
Frequency (Hz) | Measured value (dB) | Reverse A characteristic curve (dB) |
---|---|---|
63 | 71.9 | 64 |
125 | 53.9 | 54 |
250 | 44.9 | 47 |
500 | 40.3 | 41 |
Grade | Inverse A normalised floor impact sound level (lightweight floor impact noise) | Inverse A normalised floor impact sound level (heavyweight floor impact noise) |
---|---|---|
1 | \( L^{\prime}_{n, AW} \) ≤ 43 | \( L^{\prime}_{{i, F_{max},\; AW}} \) ≤ 40 |
2 | 43 \( < L^{\prime}_{n, AW} \) ≤ 48 | 40 < \( L^{\prime}_{{i, F_{max}, \;AW}} \) ≤ 43 |
3 | 48 \( < L^{\prime}_{n, AW} \) ≤ 53 | 43 < \( L^{\prime}_{{i, F_{max},\; AW}} \) ≤ 47 |
4 | \( 53 < L^{\prime}_{n, AW} \) ≤ 58 | 47 < \( L^{\prime}_{{i, F_{max},\; AW}} \) ≤ 50 |