Full detail of the Article is here.

https://jaesan-aero.blogspot.com/2018/10/aim-120c-study-using-missile-sim-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 intervalChange 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