Design study of sound insulation structure for power equipment based on multi-resonance

Aiming at the problem of controlling low-frequency line spectrum noise of power equipment, this paper designs a sound insulation structure by combining Helmholtz resonance and dynamic vibration absorption technologies. By optimizing the parameters of the Helmholtz resonator, it is matched with the main noise frequencies of 100 Hz, 200 Hz, 300 Hz and 400 Hz to achieve efficient sound insulation at specific frequencies. The natural frequency of the dynamic vibration absorber is designed and optimized to accurately match the main noise frequencies so as to reduce vibration energy. After combining the two technologies, the sound insulation performance is significantly improved, with the sound insulation quantities at 100 Hz, 200 Hz, 300 Hz and 400 Hz reaching 149.7 dB, 196.88 dB, 172.14 dB and 169.97 dB respectively, which verifies the effectiveness of the multi-resonance sound insulation structure in controlling low-frequency noise of power equipment.