Embed Size (px)
Citation preview
Klaus Schmoetzer, Dept. ESM2 Doc. no. ESM/0305/05/00 issue 1 // Date: 02-MAY-2000 Blatt: 1
Improvement of Smoke Warning Reliability in Aircraft Applications
International Aircraft Systems Fire Protection Working Group
Meeting in Bremen on May 3/4th, 2000
Fire Protection Fuselage
Klaus Schmoetzer, Dept. ESM2 Doc. no. ESM/0305/05/00 issue 1 // Date: 02-MAY-2000 Blatt: 2
Fire Protection Fuselage Improvement of Cargo Compartment Smoke Warning
Problem False Cargo Compartment Smoke Warnings
Consequences • Fire Extinguishing activation • Land ASAP• eventually Evacuation • AOG Case (Empty Fire Extinguishing Bottles)
Klaus Schmoetzer, Dept. ESM2 Doc. no. ESM/0305/05/00 issue 1 // Date: 02-MAY-2000 Blatt: 3
Fire Protection Fuselage Improvement of Cargo Compartment Smoke Warning
Analysis• Non - fire case in the aircraft is not fully understood.
The way to improve this is to identify relevant parameters for fire and non fire
• More detection time (>60 seconds) could be necessary to check the warning situation and to confirm a fire
• With a more reliable detection/signaling an increased level of safety can be reached
ProposalExpand max. detection time of 60 seconds to approx 2 minutes
ifenhanced fire recognition and confirmation procedures are used within the sensors/systems
Klaus Schmoetzer, Dept. ESM2 Doc. no. ESM/0305/05/00 issue 1 // Date: 02-MAY-2000 Blatt: 4
Fire Protection Fuselage Improvement of Cargo Compartment Smoke Warning
Potentials for new fire detection instrumentsSystem needs internal evaluation time to confirm sensor signals
Evaluation time window
Fire Parameter 1 Fire Parameter 2
Non – fire case:Several Parameters (e.g. radiation,dust, gases) vary due to environmental conditions.
t [e.g. in seconds]
Fire case:Parameters develop typically.In Multisensors, Signals are being calculatedover a certain period of time
Evaluation time window
t
Sen
sor
Sig
nal
Klaus Schmoetzer, Dept. ESM2 Doc. no. ESM/0305/05/00 issue 1 // Date: 02-MAY-2000 Blatt: 5
Fire Protection Fuselage Improvement of Cargo Compartment Smoke Warning
Smoke Warning Reliability
Improvement of Cargo Compartment Smoke Warning
Problem False Cargo Compartment Smoke Warning
ConsequencesFire Extinguishing activation, land ASAP, eventually Evacuation, AOG
BackgroundA330/340 Data: FLT phase: 25 Warnings / 2 real ones in 2.160.165 Fh
Analysis Non - fire case in aircraft application is not fully understand Max. Detection Time of 60 seconds is not always sufficient
ProposalExpansion of max. detection time of 60s under certain conditions
Klaus Schmoetzer, Dept. ESM2 Doc. no. ESM/0305/05/00 issue 1 // Date: 02-MAY-2000 Blatt: 6
Fire Protection Fuselage
For further information contact
DaimlerChrysler Aerospace AirbusKlaus Schmoetzer, ESM2
Systems EngineeringHead of
Fire Protection and Conveyance Systems28183 Bremen / Germany
Phone: +49(0)421 538 2856Fax : +49(0)421 538 5031
e-mail: [email protected]
Klaus Schmoetzer, Dept. ESM2 Doc. no. ESM/0305/05/00 issue 1 // Date: 02-MAY-2000 Blatt: 7
Application Example: Recognition of smouldering fires in power plants
Fire Protection Fuselage Improvement of Cargo Compartment Smoke Warning
Absolute Signal of two Sensors (SCO, SH2): High fluctuation due to variation in air flows
Ratio of the two Sensors grows steadily.
Decision no fire /fire dueto gradient evolution
