Elevator wind noise

This presentation deals with prediction of high-rise elevator wind noise in reverberant shaft environment. A double-decker elevator, going downwards with speed of 10 m/s, is used as an example. In order to predict wind noise in an elevator car, two types of loads are needed: 1) turbulent pressure fluctuations (pseudo-sound, convective part, "TBL") and 2) acoustic pressure fluctuations (sound) on elevator surfaces. The starting point in the extraction of these loads is pressure data on elevator surfaces, solved using an incompressible, unsteady, scale-resolving CFD model. Parameters of the TBL loads are extracted by fitting the raw CFD data to a Corcos model at selected surfaces. The acoustic field is solved using an acoustic BEM model of the volume between the elevator and shaft walls. In BEM model, CFD pressure is used as a hydrodynamic pressure boundary condition on a rigid wall, according to the Curle's acoustic analogy.Building of the various models, results of load extractions, validity of load data and models as well as certain acoustic issues and lessons learned are presented and discussed.