Version 6.4 November 2010

01 noviembre 2010

Marshall Day Acoustics are very pleased to release version 6.4. The new features include such major improvements as the ability to estimate The impact sound level of light weight timber floors (IIC, Ln,w). Previously only concrete or masonry floors could be calculated. Typical floors with plywood, particle board, or OSB fixed to timber joists are able to be handled by INSUL, with or without plasterboard or similar ceilings.

Significant improvement in types of materials that can be modelled. Two new material types, elastic core materials, and inelastic core materials have been added. Elastic core materials can be used to model sandwich panels that have steel skins with a polystyrene or similar core. Extra parameters required in the materials file include the core density, thickness, damping and elastic modulus. Standard materials (i.e. all previous Insul materials) are now called isotropic materials.

The transmission loss of porous blankets such as fibreglass or mineral wool can be predicted.

A porous facing can be added to a construction. This would be typical of an acoustic panel system for machine enclosures, or metal roofs incorporating a perforated pan.

The prediction of profiled metal panels has been improved. The algorithms of Lam and Windle have been incorporated and these can be used over the range of profiles that Lam and Windle state they are applicable. Profiled or corrugated panels can be used in double panel arrangements.

There is a text file (profile.txt) which has a selection of pre-defined trapezoidal profiles

Floor coverings can be edited from within INSUL with a built in editor. Data can be cut and pasted from external sources such as spreadsheets.

Colour of materials can be specified in the materials file. These colours are used in the on screen drawing and printouts of the construction.

Improved ability to cut and paste data to and from the reference columns.

New html help file (to suit Windows 7), updated and improved content.

“Recent files” list on the files menu.

User can replace logo on print out with their own logo.

Printing has been tidied up with printing, pdf and print preview now identical code, with larger print preview. Should suit both A4 and letter sized paper.

Triple glazing algorithms have been modified slightly to improve agreement with test data.

A new frame type (Z-Girt) has been added.

The parameters in the absorption.txt file have been extended by adding the density of the material and a colour (which shows in the on screen picture and on the printouts).