Table of Contents
2020년 2월 6일 목요일
2020년 2월 1일 토요일
Previous Work Status
Initial Version of Missile-SIM for Performance evaluation
Aerodynamic Validation of Missile-SIM for Trajectory
AIM-120C Study using Missile-SIM : Part 1 - Sensitivity
AIM-120C Study using Missile-SIM : Part 2 - Launch Condition
AIM-120C Study using Missile-SIM : Part 2 - Launch Condition - revision
Patch note of Missile-SIM : Guidance Algorithm is added w/ Real-Time plot
W.I.P status of Missile-SIM : Addition of Air-propulsion part 1
W.I.P status of Missile-SIM : Addition of Air-propulsion part 2
AIM-120C Study using Missile-SIM : Part 3 - CUDA / LREW / METEOR types. 1 : Baseline Comparison
AIM-120C Study using Missile-SIM : Part 3 - CUDA / LREW / METEOR types. 2 : Sensitivity Analysis
AIM-120C Study using Missile-SIM : Part 3 - CUDA / LREW / METEOR types. 3 : Few mentions
W.I.P status of Missile-SIM : Addition of 3D Coordinate
W.I.P status of Missile-SIM : Development of Few generic bodies for Further Missile-SIM
Missile-SIM : Performance Evaluation for ATACMS class missile
Missile-SIM : Performance Evaluation for KM-SAM class missile
Missile-SIM : Effectiveness of Rocket motor for free-fall bomb
Missile-SIM : Performance Evaluation for Iskander / Kh-47M2 Kinzhal & ATACMS+Booster
1. Modeling of Candidates for SIZE-EFFECT
While I was coding Flight-SIM, I had curiosity about impact of the size of the missile. It is generally known that larger missile can preserve its kinematic energy and has advantage for longer range.
However, how much advantage the larger-missile have ?
As the size of the missile grows, slender ratio (l/d), propellant/weight ratio, and aerodynamic configuration (fin size and shape) are changed. So, it is hard to evaluate the pure impact of the size.
At this time, I could simulate the different size of the missile with same aerodynamic-coefficient, propellant/weight ratio. It is unrealistic, because smaller air-to-air missile generally has slender profile, smaller propellant/weight ratio. Purpose of this study is only for sensitivity study for missile-size.
2. Missile-SIM Result
Simulation has been conducted for Sea-level, 15kft, 30kft for M0.5 launch conditions. Size of the missile has been varied from AIM-9's to Massive S300 SAM class. The result shows that the larger missile has slightly higher speed however difference is small compared to its size difference.
As we expected, real-difference between small and big missiles can be shown in after-burn-out phase of the missile. Because relation between weight, proportional to the dimension^3, and drag, to the dimension^2, made larger missile could glide longer range with maintained speed.
In Sea-level, AIM-9 one almost loses its energy symmetry to its burn-phase while AIM-120 class reaches twice of that, AIM-54 class three-times, and S-300 class four-times.
Due to this result, it is natural that Point-Defense Anti-Air warfare(<30km) has missile smaller than AIM-120 class, like MICA-VL, ASTOR15, Sea-Sparrow, Sea-RAM, Crotale, and ESSM. Larger than AIM-120 class is excessive and in-practical.
At the higher altitude, difference become larger. Although smaller missile could achieve longer range, AIM-54 and S-300 sized missile goes longer than 100km, without following trajectory course.
From this result, we could understand why each nation develop own missile for different size. US, usually operating offensive counter air, will develop smaller missile to carry more missiles in limited payload for longer mission. (And offensive mission should encounter shorter range of engagement). Eastern side should develop larger missile to perform aerial-denial for high-value asset of western side.
Korean Government had sent B747-400 for Escape of Wuhan; planned A330-300 was cancelled due to discord between Korean and China.
Indeed, B747-400 flew twice to carry all people.
HL7461 conducted its mission successfully
Picture from https://cafe.naver.com/waateam/60414
2020년 1월 29일 수요일
Korean Government will send B747-400 and A330-300 to Wuhan for the escape of their own people.
I hope there will be no accident related to it.
All crew of this flight is all volunteer.
I reenact this flight with X-plane for the volunteers
(Details of flight can be different)
I usually play DCS and X-plane (BMS4.33 and il2 in the past)
2020년 1월 28일 화요일
I had taken some pictures from Airports (Incheon, Paris, Barcelona, Granada, Madrid) during my trip.
I could enjoy ride of A359, A319/320/321, and A380 for this trip; what a Airbus-Tour...
Specifically, A359 and A380 provides very nice feeling of ride.