About Us

The history of SIDLAB goes back to the late 80:s when a code called SID (Sound In Ducts) for 1D linear acoustic modelling of cascade coupled duct networks was developed by Ragnar Glav at KTH. The code written in FORTRAN was based on so called two-port (four-pole) models and the work was supported by the Swedish industry, in particular Atlas Copco and Saab [1], [7].

In the 90:s the code was revised to enable analysis of more general networks still using the transfer matrix formulation though. In addition a graphical user interface was developed using Visual Basic resulting in SID2.

In 1996, Mats Åbom and Ragnar Glav published a general formalism for the analysis of acoustic two-port networks where the elements can be connected in an arbitrary way [17]. This was implemented by Stefan Nygård along with an update of the Visual Basic user interface [19].

In 1999, Nygård, in collaboration with Åbom and Glav, further developed SID 2 to allow for one- or two-port sources anywhere in a network. This allowed the possibility of defining several inlet and outlet systems and multi-source networks. This work, partly financed by the EC-project FLODAC, resulted in the code SID 3 [23].

In 2005, a new significant step was taken when SIDLAB 1 was created based on a co-operation with the exhaust system manufacturer Swenox. SIDLAB 1 or SIDLAB Acoustics is SID3 converted into MATLAB, a work done by Tamer Elnady supported by Åbom. The use of MATLAB gives the possibility for the user to have access to the source code so that advanced users can make their own modifications and easier perform pre- and post-processing. The possibility to create links to MATLAB modules, such as acoustic FEM, to generate new elements models is also important. Another important improvement was the creation of a new drag and drop graphical interface for easier construction of networks. In SIDLAB 1 also new elements models developed within the EC-project ARTEMIS were included, e.g., models for diesel particulate filters (DPF:s) [27]. Furthermore the most recent models for the impedance of perforated plates were implemented based on Elnady´s doctoral thesis [25].

In early 2008, SIDLAB 2 is released where new products have been added on the measurement side: SIDLAB Measurement and SIDLAB Acquisition. SIDLAB Measurement and Acquisition are based on the extensive experience within the group concerning the experimental determination of two-port data [2], [3]. SIDLAB Flow has been introduced as an add-on to SIDLAB Simulation, which enables the analysis of the flow distribution and pressure drop across the network. SIDLAB Flow is also based on two-port formalism through an analogy between the acoustic and the flow variables and assumes an incompressible mean flow. In practice this means that analysis is restricted to duct networks where the Mach-number is less than 0.3

We are committed to continue our development of SIDLAB based on the research projects we are involved in and to make sure that the code always is based on the best available published models. Our vision is that SIDLAB should be the best and most complete software for linear acoustic problems in flow duct networks.

“Note: The numbers in the above text refer to the list of Academic References”