The effective properties of importance are the mass per unit Area (`m`), Critical Frequency (`f_c`) and the internal damping (`\eta_i`), which are calcualted and displayed for both Panel 1 and Panel 2.įor single leaf transmission loss either Panel 1 or Panel 2 can be used. The manner in which the various leaves are combined into a single equivalent panel are outlined below. On that basis it seems like a reasonable approach. It should be noted that the composite material properties are generally weighted against mass and on this basis, a composite material comprising of a heavy maonsry and a lightweight board are likely to be dominated by the masonry both in practice and using this theoretical methodology. Application of this concept for composite leaves with concrete and lightweight cladding for example, is assumed to be reasonable although not explicity validated with published studies. Validity of this approach has only been tested in limited studies which generally have considered multiple layers of plasterboard (gyprock). The multiple layers and materials are composed into theoretical composite equivalent homogenous panels (one per side of the cavity).
Where these are different from the default material properties for the selected material, the input cell will turn orange to indicate that they've been changed from the default values. The user is able to input their own custom material properties if they are known. Typical material properties for various construction materials are provided for convenience. In practice the order of the materials in a given panel is irrelevant as they're combined into an equivalent single panel anyway. Each leaf/panel can be comprised of multiple layers of a material and up to two different materials per leaf/panel - described here as the 'inner' and 'outer' layers of the single composite leaf. In this implementation there are two leaves/panels, Panel 1 and Panel 2. The theory is based on the concept of a Single Leaf or a Double Leaf (cavity wall) partition. The theory implemented in Strutt is based on the work of Davy with some additional elements and assumptions which are outlined in detail below. Studborne (steel or timber studs in various configurations).Airborne (including losses from absorbing media).
It breaks the problem into various constituent parts and joins the total transmitted energy due to each path together. The double leaf theory is considerably more complicated. The theory is broadly broken into two components: Strutt|Transmission Loss|TL Prediction predicts the panel transmission loss using Davy's partition theory and inserts it into the current row of the worksheet.
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