Establishing Grounds for Building Orientation Mapping and Validation of Noise Level Correlation Modeling on Aircraft Take-off and Landing

Abstract

This research highlights correlation modeling between residential buildings orientation toward the runway as noise source and noise level. Many studies used noise mapping to identify noise performance in cities, but none of them discussed building orientation as an effort to reduce noise. This research aims to resolve the noise exceeding threshold of 55 dB for landed residential area. The method used was empirical experiments based on ISO 1996-1 using a 1:1-scaled building block model that was rotatable on its axis on various orientation angles. To examine the difference in sound reduction patterns, measurements were carried out during aircraft take-off and landing in three measurement conditions: outside the building model (OS), inside the model with both closed (CW) and open window (OW). The relative values of sound reduction in every angle were mapped and a Correlation Modeling was then empirically developed and theoretically validated by origin-8 software. As a result, the empirical validation formula deviation averaged only 1.20% and 1.13% during take-off and landing respectively from the actual noise and the theoretical validation. Furthermore, the new modeling was verified as a derivation from the grand theory of inverse square law and could be applied for master plan design.

A mechanically adjustable acoustic metamaterial for low- frequency sound absorption with load-bearing and fire resistance

“…The noise absorption metamaterials can achieve wideband and low frequency noise absorption through parametric design. However, for variable noise, such as construction noise [24,25] and aviation noise [26][27][28], the building noise may come from different noise sources at different time periods, and the aircraft shows different noise spectrum during takeoff and landing. For this case, the broadband noise control may not solve the problem of random noise with discrete peak spectrum, and it will also lead to redundancy in the spatial size of the broadband sound absorption material composed of multiple units.…”