Initial Version of Missile-SIM for Performance evaluation - ED Forums
 


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Old 09-09-2018, 08:49 AM   #1
litzj
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Default Initial Version of Missile-SIM for Performance evaluation

http://jaesan-aero.blogspot.com/2018...e-sim-for.html

I planned to make performance evaluation of the missile for its range.

Coefficient of missile should be calculated by CFD (M, AoA)
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Old 09-22-2018, 07:41 AM   #2
litzj
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https://jaesan-aero.blogspot.com/201...ssile-sim.html

Recent update : validation for CFD setting for generic missile shape.

Unfortunately, I cannot achieve very precise aerodynamic coefficient due to limitation of CFD computing source





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Old 10-13-2018, 10:42 AM   #3
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Full detail of the Article is here.

https://jaesan-aero.blogspot.com/201...im-part-1.html

As the first study object, AIM-120C is chosen, and the objective of the study is sensitivity analysis for range performance and its optimization. Range of study includes "Rocket parameter", "Launch condition", and "Multi-stage version of CUDA".

This Part 1 will show sensitivity analysis of rocket parameter for AIM-120C baseline missile; Part 2 is optimization of rocket parameters and launch condition for longer range; Part 3 is proposal of AIM-120 sized dual-stage CUDA missile with optimized configuration.

Part 1 : Sensitivity Analysis of AIM-120C

As shown in Fig. 1-1, baseline of AIM-120C is modeled; some part of the data like propellant weight, and burn time are referenced from previous estimation work. Target parameters of the sensitivity are propellant weight, burn-time, ISP, Drag(CD), Lift(CL), and usage of dual-pulse.

Reference launch condition is set as M1.3 at 30000ft, and I assumed missile go straight without altitude change. Range is calculated when speed of the missile is re-decreased as M1.3 (The missile should pursue target having at least M1.3 speed).

As a summary of Sensitivity (M1.3, 30kft)

(1) 1.2 km Range↑, M 0.1 Speed↑ via 1.0 kg↑of Propellant (in given total weight)

(2) 0.67 km Range↑, almost zero Speed change via 1.0 s↑of Burn time (smaller mass-flow)

(3) 0.2 km Range↑, M 0.01 Speed↑ via 1.0 s↑of ISP

(4) 0.65 km Range↑, almost zero Speed change via 1.0 % Drag reduction

(5) almost zero Range, almost zero Speed change via 1.0 % Lift↑(negligible)

(6) 0.4 km Range↑, M 0.02 Speed↓ via 1.0 s increase of Dual pulse interval


Change of Lift is almost negligible for both range and peak speed performance. Higher lift configuration having more, longer, or larger fins is related to maneuverability and stability.
It is natural that increase of some parameters (Propellant, and ISP) are directly proportional to the range and speed increase.

Longer Burn-time and Drag reduction can increase range without change of speed performance.
(Tendency can be changed at different reference condition)

It could be interesting result that increase of Pulse interval can extend range while small decrease of peak speed.

In given hardware specification (weight, propellant, ISP, lift, and drag), longer burn-time and pulse interval are recommended to extend the range of the AIM-120C class missile.

Improvement via optimization will be performed at Part 2; Result of this sensitivity is applied while study for trajectory and launch condition will be conducted







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Old 10-21-2018, 08:49 AM   #4
litzj
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I just published update of AIM-120C study using Missile-SIM

https://jaesan-aero.blogspot.com/201...im-part-2.html

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Old 11-09-2018, 12:59 PM   #5
litzj
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https://jaesan-aero.blogspot.com/201...-guidance.html




There is real-time plot video for the Missile-SIM (Guidance of Missile with 0.1s time step)
https://www.youtube.com/watch?v=zBjvOfBz3hs&t=5s
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Old 11-11-2018, 03:27 PM   #6
Rex854Warrior
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Very intresting, how accurate are the inital values you've inputed (burn time, the amount of fuel,...) ? Is the amount of thrust produced at different stages taken into account ? And also when it comes to guidance simulation, what exactly is it doing, just guiding the missile to the target or is it also making sure the missile optimizes it's energy consumption ?

Thank you The R-77, MIM-104, Matra S530D, AIM-7M and the S-300 missile performance, can't remember the exact name, are some of the ones I would be most intrested in seeing.

Regards,
Rex.

P.S. : The missile in your tests looks more like an AIM-120B.
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