Dual-mode exit area scheduling?

In summary, dual mode exit area scheduling is a control system that variates the exit area of an engine depending on the flight regime and demand. The system is calibrated to provide the best engine operation at a given demand.
  • #1
perfectz
60
0
dual-mode exit area scheduling?

what is dual-mode exit area scheduling?
 
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  • #2
You leave through the door or the window?
 
  • #3
mgb_phys said:
You leave through the door or the window?

Dude I am talking about nozzles of F-22, F-16 ...
Detailed explanation please...
 
  • #4
I'll have to look at the "dual mode" part (sounds like a controls systems detail) but the exit area scheduling is an automatic control system that varies the exit area of the engine dependent on the flight regime and demands. You'll notice in videos of an aircraft ramping up to take off an aircraft carrier, as the thrust demand is increased, the exit area of the exhaust is opened to allow supersonic flow and increase the exhaust velocity and thus, more thrust. The scheduling is a "calibration" of sorts to provide the best possible engine operation at a given demand.

I would venture a guess that the dual mode aspect is that there are two computer controls that redundantly control the scheduling.

There is an interesting section on the thrust vectoring control nozzle system on a NASA re outfitted F-15 here:
http://www.nasa.gov/centers/dryden/history/pastprojects/Active/pub_online/setp_d6.html

Look under the Nozzle Actuation and Nozzle Control Computer and Control Algorithm sections.
 
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  • #5
What is supersonic dash capability, and you know something about independent A8 and A9 controls of nozzle in F-16?
 
  • #6
Supersonic dash is the ability to go to a supersonic speed that is outside or at the edge of the aircraft's normal operating envelope. Most attack have a dash to target so as to get the aircraft in and out very quickly. The actual range and speed of the dash is a part of the overall design and requirements.

As far as the F-16 A8 and A9 controls, a little search shows that the A8 area is the throat area and the A9 area is the exit area of the nozzle. How those controls work I have no idea. Andre should chime in here. He would be able to answer that.
 
  • #7
andre where are you?
 
  • #8
You could try PM'ing him.
 

1. What is dual-mode exit area scheduling?

Dual-mode exit area scheduling is a method used in transportation systems to allocate exit times for different modes of transportation, such as buses and trains. It aims to reduce congestion and improve efficiency by coordinating the departure times of different modes of transportation.

2. How does dual-mode exit area scheduling work?

Dual-mode exit area scheduling uses algorithms and real-time data to determine the optimal departure times for different modes of transportation. It takes into account factors such as passenger demand, travel time, and the capacity of each mode of transportation to create a synchronized schedule.

3. What are the benefits of dual-mode exit area scheduling?

Dual-mode exit area scheduling can lead to a more efficient use of transportation resources, reduce travel time, and decrease congestion. It can also improve the reliability and punctuality of transportation systems, resulting in a better overall experience for passengers.

4. What challenges are associated with implementing dual-mode exit area scheduling?

Implementing dual-mode exit area scheduling can be challenging due to the complexity of coordinating different modes of transportation and the need for advanced technology and data analysis. It may also require cooperation and coordination among different transportation agencies and stakeholders.

5. Is dual-mode exit area scheduling used in real-world transportation systems?

Yes, dual-mode exit area scheduling is currently being used in various transportation systems around the world. For example, it has been implemented in cities such as London and Singapore to improve the efficiency of their bus and train networks.

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