ON THE SIMPLIFICATIONS USED IN MOBILITY MODELS TO PREDICT STRUCTUREBORNE POWER FLOW IN WOOD STUD WALLS WITH DIRECT-ATTACHED GYPSUM BOARD

摘要

The mobility approach is a comparatively simple method to compute structure borne power flow between plates and beams coupled at one, or more, well defined points. Implicit to these expressions are a number of assumptions. Simplifications are also made when modelling wood stud wall systems. Using ordinary point force mobilities Craik and Smith [1] predicted with good accuracy the structural power flow across a wood stud wall with direct-attached gypsum board on both sides when the screws on either side of the stud were aligned. This type of alignment cannot be assumed if the wall has resilient channels. Thus it is necessary to evaluate the mobility assumptions to determine the most appropriate method to model walls with resilient channels. In this paper, the first of two, assumptions regarding the vibration response of the stud and gypsum board in isolation are evaluated. The second paper [2] examines the power flow from the stud to the gypsum board as a function of number and location of the screws. The paper begins with a brief review of the mobility expressions.