Study summary and conclusion
Enclosed cabinet installed in aircraft cabin may experience high internal pressure load during very rapid or explosive decompression event. If not considered properly this high pressure load could dismantle the cabinet and some parts could be detached and injured occupants while in their seat (see more at Article #1).
Computing enclosed cabinet differential pressure (as Boeing D6-55441)
Aircraft OEM provide guidance table of pressure (like Boeing D6-55441 and Airbus 2520M1F010100) to consider for cabinet installation in standard cabin. With ESonix those pressure tables can be easily recomputed with the appropriate aircraft decompression model (see more at Article #3).
In modified cabins (additional partitions, bulkheads, VIP arrangements, etc…), OEM tables of enclosed cabinet differential pressure are no longer valid. New decompression analysis must be carried out considering the cabinet in its real environment. Such analysis can be easily performed with ESonix even in complex cabin configuration (see more at Article #4).
Divergence with OEM guidance
In most cases, the installation of the enclosed cabinet in a smaller room than the standard cabin will generate higher differential pressure. However in some specific cases depending on the cabinet volume, vent area and its installation environment (room volume, room connection to its neighbouring compartments, etc…) the maximum differential pressure is lower than the OEM reference. In such a case, performing the decompression analysis considering the cabinet in its real environment could be beneficial as the internal pressure and its sizing could be optimised with a potential weight reduction (see more at Article #5 and Article #6).
Considering cabinet deformation in the decompression analysis
In the opposite scenario when the installation of the enclosed cabinet in a modified cabin leads to higher differential pressure than the OEM basis, performing the decompression analysis integrating the cabinet stiffness will remove some conservatism and bring down the resulting differential pressure. With the approach presented the article 7 (Article #7), this kind of analysis can be easily performed with ESonix using its dynamical features.
As presented through all those articles, the justification of an enclosed cabinet installation in a non “standard” cabin requires a new decompression analysis to get the applicable differential pressure. With a good knowledge of decompression phenomenon and its analysis parameters, the simulation of the real configuration can be performed with ESonix. Dedicated training an “Small volume” decompression is also available on demand. Do not hesitate to contact us for further details. https://www.aero-sonix.com
See here the list of Articles referring to the study of Small Volume Decompression:
Article #1: Small Volumes Decompression #1 - Understanding the Problem
Article #2: Small Volumes Decompression #2 - Airline/Pax, VIP configurations and Aircraft Parameters
Article #3: Small Volumes Decompression #3 - Analysis of closed compartment in the Cabin Airline/PAX Configuration
Article #4: Small Volumes Decompression #4 - Analysis of closed compartment in the Cabin VIP Configuration
Article #5: Small Volumes Decompression #5 - Airline X VIP Results Comparison
Article #6: Small Volumes Decompression #6 - Airline X VIP Results Comparison (Further Step)
Article #7: Small Volumes Decompression #7 - Decompression Analysis considering the Cabinet Stiffness
Article #8: Small Volumes Decompression #8 - Study summary and conclusions