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SIDLAB Acoustics

SIDLAB Acoustics is a 1D software for modeling the propagation of low frequency sound in complex duct networks. The frequency range is restricted to the plane wave region in the connecting pipes. It is based on the two-port theory, where each element is described by a transfer matrix.

Building the network is easy by simply dragging and dropping different elements. A number of useful network viewing tools are available: zoom, pan, and element alignment. Definition of active sources is possible and easy to implement. A number of the most common one- and two-port elements are included using the latest models that are available in the literature. The user also has the possibility to add his own standard models as user defined two-ports.

 

SIDLAB Acoustics calculates:

  1. Transmission Loss.
  2. Noise Reduction.
  3. Insertion Loss.
  4. system Resonances.
  5. Amplitude and phase of the acoustic pressure at any node in the network.
  6. Acoustic net power flow through a certain node.
  7. Acoustic pressure radiated from the system outlets.
  8. Level of different harmonics for an internal combustion engine.

 

SIDLAB Acoustics is based on the idea of project files. When you start a new project, all variables and results are saved in a single (.sid) file which is compatible with (.mat) files. This file can be opened later in MATLAB for any non-standard post processing. You can re-open this file in SIDLAB Simulation and you restore your working environment with all variables set, exactly as you saved it the last time.

 There is a possibility to generate a log file which stores all input parameters and variables of the project in a text file for easy access. A (.bmp) picture of the network is also available in the project directory to be included in reports. You can easily export any plot to any other Windows application. You can compare the results of this project to any simulation or measurement result you have earlier.

  

Standard Two-Port Elements

  1. Pipe (Hard walled, can be filled with porous material).
  2. Horn.
  3. Quarter Wave-Length Resonator (can be filled with porous material).
  4. Helmholtz Resonator.
  5. Catalytic Converter (decrease the contents of harmful exhaust gases)
  6. Diesel Particulate Filter (DPF reduces the harmful emission of soot particles from diesel engines).
  7. Lined Duct (with porous material)
  8. Sudden Area Expansion and Contraction
  9. Expansion Chamber (concentric extended inlet and outlet).
  10. Area Constriction.
  11. Lumped Element.
  12. Perforate (lumped impedance element)
  13. User-Defined transfer matrix as a function of frequency.

Standard One-Port Elements

  1. Reflection Free pipe termination.
  2. Free space pipe termination.
  3. Baffled pipe termination.
  4. Frequency independent impedance.
  5. User-Defined frequency dependent impedance.

Standard Sources

  1. Frequency independent pressure source.
  2. User-Defined frequency dependent pressure source .




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