Impact of 50 Hz Power-Line Harmonic Vibration on Residential Living Quality: From Resonance Mechanisms to Building Design Guidelines

Why is your building humming? Uncovering the hidden impact of 50 Hz Harmonics. Have you ever encountered persistent, low-frequency humming or vibration in a residential building that "disappears" when measured with standard sound meters? This research addresses the critical gap between human perception and traditional acoustic standards (dBA), focusing on the overlooked phenomenon of 50 Hz Power-Line Harmonics. Key Highlights of this Dataset & Paper: The XY Definition: A newly proposed design framework for architects to avoid "Modal Overlap" and structural resonance in residential rooms. Field Evidence: Includes spectral analysis identifying dominant peaks at 103 Hz (transformer harmonics) and 329 Hz (mechanical vibration) recorded from real-world residential settings. Multimedia Proof: Supplementary audio files are provided to demonstrate the characteristic "indoor drone" that causes occupant annoyance and sleep disturbance. Abstract Low-frequency vibration associated with 50 Hz power-line harmonics is a phenomenon commonly observed in residential buildings, yet it has received relatively limited attention in acoustics and vibration research as well as in existing standards. This is largely because such effects are often not clearly reflected in conventional A-weighted sound pressure level (dBA) measurements, despite occupants reporting persistent discomfort, sleep disturbance, and annoyance. This paper analyzes the physical mechanisms of low-frequency vibration induced by 50 Hz harmonics, with particular emphasis on the interaction between electrical vibration sources, structure-borne transmission, and resonance phenomena within enclosed spaces. The analysis demonstrates that structural and room resonance can amplify low-frequency vibration to perceptible levels, even when measured sound levels remain below commonly accepted acoustic limits. The study proposes a conceptual framework for architectural design and building layout aimed at reducing the risk of resonance and its adverse effects on occupants. This work serves as a reference for understanding an often-overlooked environmental issue and provides design approaches more closely aligned with human perception. Supplementary Data Included: Technical Paper: (Bilingual: Thai-English) Audio Recordings: Indoor ambient noise, transformer harmonics (100-500 Hz), and water pump vibrations (329 Hz). Spectral Analysis Images: Real-world FFT data from smartphone-based tools.