![]() ![]() ![]() Analytical models and numerical simulations are used to calculate the insertion loss by the designed noise barriers. The propagation of low-frequency waves is significantly suppressed by the interplay of the tuned resonators installed on the surface of the noise barriers. For a given obstacle size, low-frequency sounds (long wavelengths) diffract more. In this work, we show that by designing noise barriers designed with an array of tuned resonators can achieve high attenuation, more than 5 dB, of noise at low frequencies. Diffraction causes sound, which normally travels in straight lines. Even though noise barriers are effective at high frequencies, low-frequency control remains challenging as sound waves at low frequencies are easily diffracted over the barriers. Analytical models and numerical simulations are used to calculate the insertion loss by the designed noise barriers.ĪB - Noise barriers reduce the level of noise that reaches the receiver by interrupting the noise propagation path. In this work, we show that by designing noise barriers designed with an array of tuned resonators can achieve high attenuation, more than 5 dB, of noise at low frequencies. For instance, the great range over which certain sea mammals can communicate is made possible partially by the low attenuation of sound in water. Even though noise barriers are effective at high frequencies, low-frequency control remains challenging as sound waves at low frequencies are easily diffracted over the barriers. Because less sound is absorbed in solids and liquids than in gases, sounds can propagate over much greater distances in these mediums. N2 - Noise barriers reduce the level of noise that reaches the receiver by interrupting the noise propagation path. The exact cutoff frequency for a single low-pass filter with unity gain at DC and asymptotically matching the two-term filter representation (3,4), can be derived as c,single + 2. T1 - Low-frequency noise reduction by a noise barrier made of a resonator array ![]()
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