Vibroacoustic optimization

Organisation

West Pomeranian University of Technology, Szczecin

al. Piastow 41
71-065 Szczecin
Polska

Reference number
CO/0056

The Applied Vibro-Acoustic Department is involved in many international and national projects, contributing its experience in the development of innovative research techniques. Our applied research techniques are the vector distribution analysis of acoustic fields generated by sources in the real-live conditions and the creation of spatial visualization of the acoustic wave response to the obstacles on the way of its propagation. Experiments are carried out research laboratory methods in real conditions using an innovative methods, such assound intensity SI and laser PIV, LDA), for analysis of the acoustics wave flow as the acoustic energy or noise flux in the sound field. The distribution acoustic field is presented graphically on the 2D plane or in 3D space as a sound intensity maps, acoustic energy flux lines, shapes of the travelling acoustic wave or as a spatial distribution of intensity izosurfaces.

Our research are directed to enrich knowledge to better understanding of the noise generation by real sources as an air condition installations, turbo-machinery, pump, fans (HAVAC systems) to identify more effective ways of noise reduction. New testing methods improve and develop modern diagnostic techniques used machinery and mechanical appliances conducted acoustic methods. They also have a crucial importance in the validation of computer simulations, which often differ significantly from results recorded in the real.

Application of the sound intensity and non-invasive laser methods, including the presentation of space vector distribution of acoustic power, brings new insight into theory and the nature of acoustic field formation. which will facilitate to make good decisions to optimalization construction and technology of industrial products.

The AV-AD has well equipped modern laboratory:

  • Ship acoustics (muck-up superstructure in scale 1:1),

  • Semi-anechoic chamber,

  • Laser anemometry research stands (equipment: PIV and LDA systems),

  • Acoustic flow graphics studio.

 

Previous experience in Framework Programmes: coordinator, partner

 

With application of sound intensity and laser anemometry measurement AV-AD team offered expertise of:

  • sound power of sources,

  • sound energy transmission through partitions (vectors field distributions),

  • identification and location of acoustic sources,

  • measurement of transmission loss, sound absorption, specific acoustic impedance, etc.,

  • measurement and graphical presentation of the sound energy flow in near and far acoustic fields,

  • graphically mapping scattering, interference or reflected acoustic waves in real environmental fields,

  • experimental study of acoustic power flow inside and outlet of the ducts and pipes,

  • experimental validation of numerical modeling results from platforms CFD, FSI, CAA using innovation measurement techniques (SI, PIV, LDA).

 

Research activity in ship acoustic laboratory:

  • vibro-acoustic investigation in dynamic conditions (testing technology and construction) for the natural size ship cabin built inside a mock-up superstructure,

  • vibro-acoustic characteristics for separate natural size cabin partitions; bulkheads, ceilings and floors,

  • structure borne and air borne transmission loss, insertion loss, sound radiation efficiency, etc.

  • measurements and mapping the acoustic power radiated by cabin partitions using Sound Intensity Method,

  • measurements of vibration and noise level of ship mechanism and noise inside ship accommodations (structure-borne and airborne noise with flanking transmission, measured on board or during trial trip).