---
description: SDM (Standard Dynamic Model)
---

# Case 2 : SDM

## &#x20;Introduction

* 모델 동체는 실린더형이며 주익 익형과 평면형상은 사다리꼴로 형상이 단순하며 제작이 용이함
* 모델형상이 공개되어 있으며, 국제적으로 여러 기관에서 시험한 결과가 공개되어 있음
* 저 받음각에서 비선형적인 공력 특성을 보여줌
* CFD를 통해 이러항 비선형적인 공력 특성이 나타나는지 확인
* 자세한 분석을 통한 비선형적인 공력 특성의 원인 분석 필요

## &#x20;Wind Tunnel Test

**아음속 비행체(SDM)  공력해석**

* 국과연, 공사 및 항우연 풍동에서 공력측정시험 수행
* 형상 : SDM ( Standard Dynamic Model)
* SDM ( Standard Dynamic Model) designed by NRC and tested at NRC 1.93m X 2.74 m tunnel
* 동체 형상 : 원통, 주익 익형과 planform : trapezoidal

![Standard Dynamic Model](https://3677869846-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LLYBDuv9aXEPGNxQyav%2F-LLmdxT1_guMF9gAGat1%2F-LLmexMGJdV-RZ7NVvyy%2FFig_2_1.png?alt=media\&token=d8f57356-a9cf-4ef5-8594-78c10911bd87)

![Standard Dynamic Model](https://3677869846-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LLYBDuv9aXEPGNxQyav%2F-LLYpdqASonx9gcaDsRj%2F-LLYP7HD1kc7HaWBLTEw%2FSDM.png?alt=media\&token=651e6c46-7892-45fa-9e7e-e7dfd0b0550b)

![Arc angle change test](https://3677869846-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LLYBDuv9aXEPGNxQyav%2F-LLmfnou-xQTmlAkmZiN%2F-LLmfr7WBlAq87ql37IX%2FFig_2_3.png?alt=media\&token=12d9401f-53f6-479e-9e70-eedb4a3e7f08)

![Yaw rotation angle change test](https://3677869846-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LLYBDuv9aXEPGNxQyav%2F-LLmfnou-xQTmlAkmZiN%2F-LLmfvDwnQMrjQTlZimK%2FFig_2_4.png?alt=media\&token=b968066c-63cf-46ef-bd9a-0974e149b4af)

## &#x20;Result

&#x20;**아음속 비행체(SDM)  공력해석, Run Log(KARI)**

* 모델 지지 Sting : 직경 – 35mm, 길이 – 92cm
* 풍속 : 38m/sec, 50m/sec, 70m/sec & 100m/sec
* Model blockage ratio : 0.56%\
  \-  blockage correction is negligible

![RunLog](https://3677869846-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LLYBDuv9aXEPGNxQyav%2F-LLmiPEPhCwuAVQIXs5_%2F-LLmjtx2h1Hvsb5wcmOD%2FFig_2_5.png?alt=media\&token=0bbb76b5-7e48-4a1b-96c6-1a34829c2443)

**수직력 및 피칭모멘트 결과 비교(KARI)**

* T044R042 : wrong geometry
* NRC 100  풍속 : 100 m/sec
* T060R020 풍속 : 50 m/sec, model size is double

![Normal Force Coefficients](https://3677869846-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LLYBDuv9aXEPGNxQyav%2F-LLmiPEPhCwuAVQIXs5_%2F-LLmk0ywLMR_q0iVfq_k%2FFig_2_6.png?alt=media\&token=58f057e9-7c2d-4644-ba1f-23353d5afb88)

![Pitching Moment Coefficients](https://3677869846-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LLYBDuv9aXEPGNxQyav%2F-LLmiPEPhCwuAVQIXs5_%2F-LLmkAurSHBtdX6YMfEI%2FFig_2_7.png?alt=media\&token=991e4ccb-b2c8-4ab0-b382-7506a8e0eb97)

* Pitching moment plots show deviations for different wind speed

![Normal Force Coefficients](https://3677869846-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LLYBDuv9aXEPGNxQyav%2F-LLmlf5X3QRgVZYCfGXa%2F-LLmlh2082C4bnsYQSZj%2FFig_2_8.png?alt=media\&token=7e04e84a-df95-428f-a5ee-37b0f0b60453)

![Pitching Moment Coefficients](https://3677869846-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LLYBDuv9aXEPGNxQyav%2F-LLmlf5X3QRgVZYCfGXa%2F-LLmlmpO6ipMiGg6rdGF%2FFig_2_9.png?alt=media\&token=69ff78d2-37fb-438d-b798-e5d1b08a207c)

* S : strake,    P : ventral fin,    C : canopy
* \+ : attached, - : detached

![Normal Force Coefficients](https://3677869846-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LLYBDuv9aXEPGNxQyav%2F-LLmmwUqTHL6MvUKh4nj%2F-LLmn8g7DbS4GGMraWzA%2FFig_2_10.png?alt=media\&token=608a793d-e03e-45e6-8fbb-75c0ac5b1cdb)

![Pitching Moment Coefficients](https://3677869846-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LLYBDuv9aXEPGNxQyav%2F-LLmmwUqTHL6MvUKh4nj%2F-LLmnBumodG9sRIJcNAh%2FFig_2_11.png?alt=media\&token=1a92e1a7-9ad4-4c25-af47-0f2e0a7eb0c6)

## &#x20;Attached files

* Case2\_소개자료.pptx                                                                :  Case 2 소개 자료
* Case2\_참고자료\_KARI-ADG-TM-2003-014(2002버전).pdf :  Case 2 참고 문헌
* Case2\_SDM.igs                                                                          :  Case 2 형상 파일

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