RE: RE : RE: [certi-dev] Real-Time HLA simulation?

[Gotthard,Petr]

Where exactly do you see the conflict? I have a continuous simulation doing small steps (runs). After several runs, the HLA simulation time is advanced and the federate is frozen (waits) until simulation time = real time. If a time regulating federate don't advance the time, the whole federation is frozen.

Petr

 

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From: address@hidden [mailto:address@hidden On Behalf Of HADJ AMOR HASSEN
Sent: Tuesday, April 29, 2008 2:27 PM
To: CERTI development discussions
Subject: RE : RE: [certi-dev] Real-Time HLA simulation?

Hi Petr,

Thanks for answering.

My simulators aren't 
real time. i did changes to make them scaled-real-time (Simulated time = k * 
real time). This isn't my problem.

My problem is how to mix Real Time 
algorithms (waiting for real time) with HLA time management services. A conflict 
will happen for sure.

Let be a federate1 which updates its attributes at 
t=t1. with the time elapsed during the data transfer, the other federates will 
receive the new values at t=t1+t'. So the simulation isn't real time.

I 
am also thinking of another possibility: Can we try to freeze all the simulation 
(federation) to make it real time without carrying if federates are real time or 
not. 

Best regards,
Hassen


"Gotthard,Petr" 
<address@hidden> a écrit :

Hi Hassen,

I believe I have created a concept for real-time (or scaled real-time) simulation. My federations are both time constrained and time regulating. The point is to make several simulation runs, increase simulation time and then wait for real time. (Simulation run is a small local step done without HLA interaction, e.g. flight dynamics modeling step. This is to reduce HLA overhead.)

 

I wonder if there is a better way than what I do?

 

Petr

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From: address@hidden [mailto:address@hidden On Behalf Of HADJ AMOR HASSEN
Sent: Tuesday, April 29, 2008 9:45 AM
To: address@hidden
Subject: [certi-dev] Real-Time HLA simulation?

Hi all,

I am developping a HLA federation using CERTI. I try to communicate two simulators: OpenModelica for control part and OpenMASK for graphical part with human interaction(mouse, keyboard...).

- For OpenModelica, i implemented a "TCP wrapper" in which i call the HLA services.
- For OpenMASK, I integrated the HLA services directly in the simulation.

First test, it seems working.. I controlled a graphical federate (OpenMASK) by a comportemental federate (OpenModelica). The both simulators have real time execution. My problem is:

- Which strategy for time i had to use? which federate had to be regulator or constrained? the both simulators are real time, so i can't control the advance of time in each simulator! it means that one can't use Time Management services in a real time simulation?

- Suppose now that the simulators aren't real time. Is it possible to develop a real time HLA simulation USING the Time Management services?

Any idea or suggestion?

Best Regards,
Hassen

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