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Denis Blanchet has developed a wide expertise in very different fields.  He has learned over the years the benefit of teaming up with other experts when necessary to ensure a positive and fruitful outcome of any projects.  His many international contacts developed over the years has made him a strong ally to have when dealing with difficult, unchartered VA applications.  Our offering is therefore diverse and potential projects that differ from our existing experience are more than welcome.

Cabin noise

In the last few years, the marine industry has increasingly adopted SEA (Statistical Energy Analysis) to model all kinds of ships from luxury yachts to cruise ships including cargo ships, ferries, military vessels and many others. These ships are mainly built from steel, aluminum or composite. They come in various shapes and sizes and the empirical acoustic models cannot handle such a variety anymore. The combination of SEA methodology and the know-how to apply this method to the marine industry allows owners, architects and ship builders to design the ship’s sound package with a predictive simulation model. This ensures the best balance between noise and vibration performance, cost and total weight which also impacts the ship consumption. dBVibroAcoustics can help you understand the key aspects of predictive model building and how to use it to optimize the sound package for best performance [26,28,43].

Picture7
Image taken from paper [43]

HVAC

One of the challenges of ship cabin noise predictions is the computation of the contribution of HVAC (Heating, Ventilating and Air Conditioning) noise to the cabin total SPL (Sound Pressure Level). SNAME, ASHRAE and VDI all have elaborated methods to compute that contribution based on empirical data. It is likely that these methods will evolve in the coming years to include more and more simulated data. These data will come from the coupling between CFD (Computational Fluid Dynamics) and VA (Vibro-Acoustics) to improve the accuracy of noise levels predicted for non-generic HVAC components. dBVibroAcoustics can help you understand the key aspects of HVAC noise generation and how to automate the existing computation methods to drastically reduce model building time. Since work done is still confidential, no technical papers are yet available to illustrate this topic.

Underwater radiation

Underwater noise radiation has several implications. In military applications, noise radiated from the hull whether from airborne or structureborne sources such as the engines, gearboxes or generators can interfere with the vessel’s sonar and limit its performance. In research vessels, the same is through and the underwater noise radiated can interfere with sensitive instruments used to scan the bottom of the sea.

Finally, marine life is impacted by underwater noise preventing whale from communicating efficiently through large distances. dBVibroAcoustics can help you understand the sources of radiated noise and how to design countermeasure to reduce underwater radiated noise to optimum levels [36,37,38,41].

Picture8
Image taken from paper [41]