Study on indoor secondary radiated noise under integrated control of engineering vibration and seismic vibration of building engineering

To address the issues of building structures affected by rail transit vibrations and seismic ground motions, as well as the consequent indoor secondary radiated noise amid rapid urbanization, this study systematically investigates the Integrated Control of Engineering Vibration and Seismic Vibration (IC-EVSV) for building structures and the control of indoor secondary radiated noise. Firstly, breaking the inherent contradiction between vibration isolation effectiveness and seismic safety of traditional vibration-isolated structures, a combined control scheme integrating vibration isolators and viscous dampers is proposed. Dynamic models of a 3-story frame vibration-isolated structure and the combined control structure were established, and comparative analysis of their response characteristics under rail transit vibrations and seismic ground motions verified that the scheme achieves balanced control over both vibrations and seismic impacts. Practical engineering cases further demonstrated that this method ensures the structure’s vibration isolation and seismic performance meet the requirements, providing an innovative technical pathway for IC-EVSV. Secondly, based on the acoustic-structure coupling finite element method, evaluation indicators including sound pressure level (SPL), A-weighted sound level, and equivalent continuous A-weighted sound level were adopted to conduct multi-scenario simulations by varying key building parameters (room floor area, room height, window area, and wall thickness). Finally, focusing on practical application value, practical sound insulation materials were introduced for noise control analysis. When fully applied to indoor walls, the equivalent continuous A-weighted sound pressure level decreased significantly across all 1/3-octave bands, particularly in the high-frequency range. This quantitative analysis of the noise reduction effect of practical sound insulation materials establishes a complete technical chain of IC-EVSV – noise characteristic analysis – sound insulation optimization. Overall, this study provides a theoretical basis, technical methods, and engineering references for the integrated control of engineering vibration, seismic vibration, and indoor noise in building structures, with innovative breakthroughs in control schemes, systematic insights into noise-influencing factors, and practical guidance for noise reduction.