[보고서]레이저 충격파 기반 발사체 파이로 충격파 전파 고속 가시화 시작품 개발 및 충격 저감구조 연구

이정률

레이저 충격파 기반 발사체 파이로 충격파 전파 고속 가시화 시작품 개발 및 충격 저감구조 연구
Fast Visualization Prototype Development for Space Launcher Pyroshock Propagation using Laser Shock and Study on Shock Reduction Structures 원문보기

보고서 정보
주관연구기관	한국과학기술원 Korea Advanced Institute of Science and Technology
연구책임자	이정률
보고서유형	최종보고서
발행국가	대한민국
언어	한국어
발행년월	2018-10
과제시작연도	2017
주관부처	과학기술정보통신부 Ministry of Science and ICT
등록번호	TRKO202200002901
과제고유번호	1711057743
사업명	우주핵심기술개발
DB 구축일자	2022-06-18
키워드	화약폭발유도충격파.레이저충격파.비접촉 가진.비접촉 센싱.파이로 충격파 전파 가시화 시작품.Explosive pyroshock.Laser shock.Non-contact excitation.Non-contact sensing.Pyroshock propagation imaging prototype.

초록 ▼

□ 연구의 목적 및 내용
❍ 화약 분리 장치의 작동으로 발생되는 파이로 충격파는 매우 짧은 작동 시간동안 분리장치의 종류에 따라 1 MHz 이상의 고주파 영역에서 매우 큰 가속도 값을 갖는다(NASA-STD-7003, 1999). 이러한 충격파들은 구조물을 따라 전파하며 발사체 내부 또는 위성에 장착되어 있는 전자 탑재물의 기능을 비정상적으로 작동시키거나 오작동을 유발하게 된다. 이러한 충격파의 정확한 측정 및 전파특성을 시뮬레이션 하는 기술들이 많이 연구 되고 있다. 하지만 충격파 계측에 있어 접촉형 가속도계를 사용할 경우 굴곡진 표면에서 측정이 불가능 하거나 혹은 10 kHz 이상의 주파수 성분의 측정이 어렵다는 단점을 가지고 있다. 그리고 수치해석 (유한요소해석)을 통해 충격파 전파 양상을 가시화 할 수 있지만 계산 시간이 오래 걸리며 평판 혹은 실린더 등 간단한 구조서만 가능하다는 단점을 가지고 있으며 정량적 시뮬레이션을 위해서는 측정값을 모델 입력값으로 사용해야 하는 경우가 대부분이다. 또한 전파 중 반사파 및 회절파등과 간섭을 일으키기 때문에 소스가 다수이거나 소스가 연속적일 경우(예, 선형화약) 수치해석이 현실적으로 어렵다. 특히, 실구조에 적용하고자 할 때는 체결기구, 용접부위, 재료변화계면, 형상변화 등이 존재하여 사실상 다채널 가속도 센서 시스템을 이용한 실험적 분석에 의존할 수밖에 없다. 이에 본 연구에서는 레이저빔의 Q-switching 기술을 이용하여 파이로 충격파를 모사하고 실구조에 레이저빔 스캐닝을 수행하여 복잡한 형상 및 재료로 구성된 발사체의 서브시스템(subsystem)에서 실험적으로 획득된 파이로 충격파를 복원하여 전파 동영상으로 제시할 수 있으며 폭발과 관련된 다양한 변수들을 변화시키며 전파 동영상을 simulation 할 수 있는 HW 및 SW를 세계 최초로 개발하고자 한다.

□ 연구개발성과
❍ SCI 10건, 개발된 시작품을 활용하여 한화 실적용 중

□ 연구개발성과의 활용계획(기대효과)
❍ 제한된 숫자의 지점에서 계측된 충격파를 이용하여 실구조 전체에서 가속도 예측 및 전파 가시화에 활용
❍ 분리기구의 충격파 전파 경로 제어 및 가속도 전달량을 규명하여 발사체 구조 설계에 활용
❍ 폭발지점, 폭발속도등 파이로분리기구 파라메터 변화를 통해 충격파 시뮬레이션
❍ Shock reduction, absorber, isolator 재료 및 구조형상 개발에 활용
❍ 새로운 혹은 복잡한 재료 및 구조 채택에 필요한 충격파 영향분석에 활용
❍ 파이로 충격파 전파의 Equipment 및 위성으로의 영향평가에 활용
❍ 파이로 충격파관련 전문인력 양성 및 산업인력 재교육을 위한 Demonstrator로 활용
❍ 발사체 및 유도무기 파이로 충격파 전파 고속 가시화 시작품의 상용화
❍ 시작품의 KSLV-II 실구조물 및 유도무기 개발 시 활용

(출처 : 요약문 3p)

목차 Contents

표지 ... 1
제출문 ... 2
요약문 ... 3
목차 ... 5
제 1 장 연구개발과제의 개요 ... 10
제 1 절 연구개발의 필요성 ... 10
가. 연구 개발의 개요 ... 10
나. 연구개발대상 기술의 경제적·산업적 중요성 및 연구 개발의 필요성 ... 11
다. 발사체 파이로 충격파 전파 가시화 시작품의 시의적 중요성 ... 11
제 2 장 연구개발 내용 (1단계) ... 13
제 1 절 레이저 충격파의 다양한 구조 충격파와의 비교 연구 ... 13
가. 레이저 파장 영향 규명 ... 13
나. 압전 유도 충격파, 기계적 유도 충격파, 점형/선형 폭발 유도파 ... 20
제 2 절 레이저 충격파의 다양한 구조충격파로의 정략적 변환 기술 개발 ... 43
가. HW 및 신호처리 기술을 이용한 변환 연구 ... 43
제 3 절 선형 화약 특성화를 위해 3 채널에서 4 채널로 시스템 확장 ... 96
제 4 절 선형화약폭발 레이저시뮬레이션을 위한 다점 동시 가속도 센싱 HW 개발 ... 98
가. 멀티 채널 DAQ 조사 및 구매 ... 98
나. 멀티 채널 DAQ 보드 ... 100
다. 멀티 채널 DAQ 보드 개발 ... 106
제 5 절 레이저충격파 생성/빔제어/DAQ 고속 동기화 ... 121
가. 멀티 채널 레이저 충격파 측정 시스템 통합 ... 121
나. 멀티 채널 충격파 계측 시스템의 성능 테스트 ... 127
제 6 절 영상처리고속화를 위한 DAQ 최적화 ... 132
가. On-the-fly 데이터 전송 기법 구현 ... 132
나. 데이터 포맷 및 신호 길이의 최적화 연구 ... 134
제 7 절 On-the-fly 레이저 충격파 신호처리 기술 개발 ... 137
가. 레이저 충격파 훈련 기반의 파이로 충격파 예측 알고리즘 ... 137
나. 레이저 충격파 훈련 결과 ... 142
제 8 절 파이로 충격파 전파 고속 가시화 시작품 통합 ... 145
가. FPGA 기반의 PWPI 알고리즘 ... 146
나. SRS 및 신간 영역 신호 복원 알고리즘의 통합 ... 148
다. 통합 시스템 시작품 제작 ... 149
제 3 장 연구수행내용(2단계) 및 성과 ... 151
제 1 절 폭발볼트의 체결 위치에 따른 충격파 전달 가시화 및 저감 구조 연구 ... 151
가. 유한 요소 해석과 레이저 스캐닝을 이용한 파이로 충격파 시뮬레이션 알고리즘 ... 151
나. 파이로 충격파 시뮬레이션 알고리즘 기반 폭발볼트의 체결 위치에 따른 충격파 전달 가시화 및 저감 구조 연구 ... 160
제 2 절 충격 절연 재료에 따른 충격파 전달 가시화 및 저감 구조 연구 ... 164
가. 충격 절연 재료 선정 ... 164
나. 전자 탑재물로 전달되는 파이로 충격파 시험 환경 모사 ... 165
다. 충격 절연 재료에 따른 충격파 전달 가시화 ... 165
라. 충격 절연 재료에 따른 충격파 저감 효과 정량적 제시 ... 173
제 3 절 구조 형상과 체결 방식에 따른 충격파 전달 가시화 및 저감 구조 연구 ... 175
가. Type 1 시편에서 1/2 inch 폭발 볼트 유도 파이로 충격파 전달 가시화 ... 175
나. Type 1 시편에서 1/2 inch 파이로락 유도 충격파 전달 가시화 ... 178
다. Type 2 시편에서 1/2 inch 폭발 볼트 유도 충격파 전달 가시화 ... 180
라. Type 2 시편에서 1/2 inch 파이로락 유도 충격파 전달 가시화 ... 182
마. 구조 형상과 체결 방식에 따른 충격 저감 효과의 정량적 제시 ... 184
제 4 절 Payload Bay – Electronics 체결부 충격파 전파 가시화 ... 187
가. Payload Bay – Electronics 체결부 파이로 충격파 시험 환경 모사 ... 187
나. Payload Bay – Electronics 체결부 파이로 충격파 전파 가시화 ... 187
제 5 절 Satellite - Payload Attach Fitting 체결부 충격파 전파 가시화 ... 190
가. Satellite – Payload Attach Fitting 체결부 파이로 충격파 시험 환경 모사 ... 190
나. Satellite – Payload Attach Fitting 체결부 파이로 충격파 전파 가시화 ... 191
제 6 절 Payload Bay - Payload Attach Fitting 체결부 충격파 전파 가시화 ... 194
가. Payload Bay - Payload Attach Fitting 체결부 파이로 충격파 시험 환경 모사 ... 194
나. Payload Bay - Payload Attach Fitting 체결부 파이로 충격파 전파 가시화 ... 194
제 7 절 기대 성과 및 파급 효과 ... 197
제 4 장 목표 달성도 및 관련 분야 기여도 ... 198
제 1 절 연구개발 목표 및 달성내용 ... 198
가. 최종 목표 ... 198
나. 단계별 목표 ... 198
다. 시작품 성능 목표 ... 198
라. 연차별 연구 개발 목표 및 내용 ... 199
마. 연차별 계획대비 달성도 ... 200
바. 연차별 연구목표 및 평가의 착안점 ... 202
제 2 절 연구 성과 ... 203
가. 정량적 성과 요약 ... 203
나. 논문게재 성과 ... 204
다. 국제협력성과 ... 214
라. 사업화 성과 ... 215
제 5 장 연구개발성과의 활용 계획 ... 218
제 6 장 연구개발과정에서 수집한 해외과학기술정보 ... 219
붙임. 참고문헌 ... 219
끝페이지 ... 223

표/그림 (274)

표 Representative separation mechanism of launch vehicle
표 Examples of pyrotechnical devices based on explosive bolt and linearexplosive
표 Spacecraft application of pyrotechnical device of explosive bolt
표 Specification of laser beam with different wavelength
표 Experimental setup for shockwave measurement: (a) Experiment composition, (b) Position of six excitation points and two sensing point, front and back, on the aluminum plate
표 Comparison of SNR in different PRF of 1 Hz, 50 Hz, 100 Hz and 150 Hz
표 SNR comparison on laser shock measurement
표 Laser-induced shocks generated by different wavelength in two sensing position; (a) sensor front, and (b) sensor back
표 Laser-induced shocks in two sensing position using different wavelength; (a) 532 nm, and (b) 1064 nm
표 Experimentally generated waves in different propagation distance; 250 mm, 500 mm, 750 mm, 1000 mm, 1250 mm, and 1500 mm
표 Distance dependent attenuation characteristic of laser-induced shock signals in different thickness of specimen; (a) 2 mm, (b) 3 mm, (c) 4 mm, and (d) 5 mm
표 Experimental setup for investigation of wavelength effect: (a) same optical conditions of the beam, (b) though-thickness method, and (c) six specimens with different thickness
표 Experimental time-domain signals in different thickness of 5 mm, 10 mm, 20 mm, 30 mm, 40 mm, and 50 mm
표 Comparison of attenuation among laser beam of different wavelengths
표 Point-source pyroshock measurement: (a) 2 mm thick aluminum plate (Al-alloy 1050) configuration and (b) simultaneous 4 LDVs measurement configuration
표 Excitation point and sensing points for pyroshock
표 Measured pyroshock signals ((a) to (d)) at Point 1 to 4
표 (a) Attenuation of pyroshock for 2 mm aluminum plate, and (b) SRS response of the reference pyroshock signal and the SRS repeatability
표 Mean acceleration differences (%) in the pyroshock SRS repeatability test over the four points
표 Decomposition of the reference pyroshock at Point 1 with the bandwidth of (a) 100 Hz to 1 kHz, (b) 1 kHz to 10 kHz, (c) 10 kHz to 100 kHz, and (d) direct synthesizing of the decomposed signals
표 Frequency components of the reference pyroshock signal at Pt1 in respective to the bandwidths of (a) 100 Hz to 1 kHz, (b) 1 kHz to 10 kHz, and (c) 10 kHz to 100 kHz. (d) Frequency components of the reconstructed pyroshock signal at Pt1
표 Comparison between the reference SRS curve and the pyroshock SRS curve decomposed in the frequency band of (a) 100 Hz to 1 kHz, (b) 1 kHz to 10 kHz, (c) 10 kHz to 100 kHz, and (d) comparison between the reference SRS curve and the SRS curve superposed with the decomposed three pyroshock signals
표 (a) Measured pyroshock signals and (b) the corresponding time-frequency graph at Point 1 to 3
표 Linear-source pyroshock measurement: (a) quasi-isotropic CFRP sandwich panel with 1.34 facesheet configuration and (b) simultaneous 4 LDVs measurement configuration at stand-off distance of about 7 m
표 Excitation point and sensing points for linear-source pyroshock
표 Measured pyroshock signals ((a) to (c)) at Point 1, 2 and 4
표 (a) Attenuation of linear source pyroshock for quasi-isotropic CFRP sandwich panel with 1.34 mm facesheet, and (b) SRS response of the reference pyroshock signal and the SRS repeatability
표 Mean acceleration differences (%) in the pyroshock SRS repeatability test over the four points
표 Decomposition of the reference pyroshock at Point 1 with the bandwidth of (a) 100 Hz to 1 kHz, (b) 1 kHz to 10 kHz, (c) 10 kHz to 100 kHz, and (d) direct synthesizing of the decomposed signals
표 Frequency components of the reference pyroshock signal at Pt1 in respective to the bandwidths of (a) 100 Hz to 1 kHz, (b) 1 kHz to 10 kHz, and (c) 10 kHz to 100 kHz. (d) Frequency components of the reconstructed pyroshock signal at Pt1
표 Comparison between the reference SRS curve and the pyroshock SRS curve decomposed in the frequency band of (a) 100 Hz to 1 kHz, (b) 1 kHz to 10 kHz, (c) 10 kHz to 100 kHz, and (d) comparison between the reference SRS curve and the SRS curve superposed with the decomposed three pyroshock signals
표 (a) Measured pyroshock signals and (b) the corresponding time-frequency graph at Point 1, 2 and 4
표 Experimental setup for mechanical shock characterization and prediction
표 Measured mechanical shocks ((a) to (c)) at Point 1 to 3
표 (a). Attenuation of mechanical shock for 2mm thick aluminum plate (Al 1050), and (b) SRS response of the reference mechanical shock signal and the SRS repeatability
표 Mean acceleration differences (%) in the mechanical shock SRS repeatability test over the four points
표 Decomposition of the reference mechanical shock at Point 1 with the bandwidth of (a) 100 Hz to 1 kHz, (b) 1 kHz to 10 kHz, (c) 10 kHz to 100 kHz, and (d) direct synthesizing of the decomposed signals
표 Frequency components of the reference mechanical shock at Pt1 in respective to the bandwidths of (a) 100 Hz to 1 kHz, (b) 1 kHz to 10 kHz, and (c) 10 kHz to 100 kHz. (d) Frequency
표 Comparison between the reference SRS curve and the mechanical shock SRS curve decomposed in the frequency band of (a) 100 Hz to 1 kHz, (b) 1 kHz to 10 kHz, (c) 10 kHz to 100 kHz, and (d) comparison between the reference SRS curve and the SRS curve superposed with the decomposed three mechanical shocks
표 (a) Measured mechanical shocks and (b) the corresponding time-frequency graph at Point 1 to 3
표 Experimental setup for PZT shock characterization and prediction: (a) Input voltage signal, (b)configuration of PZT shock wave measurement
표 Measured mechanical shocks ((a) to (d)) at Point 1 to 4
표 (a) Attenuation of PZT shock for 2mm thick aluminum plate (Al 1050), and (b) SRS response of the reference PZT shock signal and the SRS repeatability
표 Mean acceleration differences (%) in the PZT shock SRS repeatability test over the four points
표 Decomposition of the reference PZT shock at Point 1 with the bandwidth of (a) 100 Hz to 1 kHz, (b) 1 kHz to 10 kHz, (c) 10 kHz to 100 kHz, and (d) direct synthesizing of the decomposed signals
표 Frequency components of the reference mechanical shock at Pt1 in respective to the bandwidths of (a) 100 Hz to 1 kHz, (b) 1 kHz to 10 kHz, and (c) 10 kHz to 100 kHz. (d) Frequency components of the reconstructed mechanical shock at Pt1
표 Comparison between the reference SRS curve and the PZT shock SRS curve decomposed in the frequency band of (a) 100 Hz to 1 kHz, (b) 1 kHz to 10 kHz, (c) 10 kHz to 100 kHz, and (d) comparison between the reference SRS curve and the SRS curve superposed with the decomposed three PZT shocks
표 (a) Measured PZT shocks and (b) the corresponding time-frequency graph at Point 1 to 4
표 Summary of characteristics of various shocks
표 Pyroshock sensing and laser-induced shock excitation points
표 Experiment setup for pyroshock signal measurement: (a) Field test with four laser Doppler vibrometers setup, (b) Initiator and mount, and (c) Position of detonation point and four sensing points on the 2 mm thick aluminum plate
표 Pyroshock signals and the laser-induced shock signals, conditioned with laser beam, filtering band, and initial, optimized and constant gains: (a) Pt 1, (b) Pt 2, (c) Pt 3, and (d) Pt 4
표 Schematic diagram of experiment setup for the laser-induced shock measurement, with the four excitation points in the same test plate for pyroshock
표 Raw and gained laser-induced shock time histories at Pt 3, depending on the different laser beam energy and fluence, under the condition of the same beam size
표 Mean acceleration differences, under the condition of the same beam size
표 Flow chart of the pyroshock response spectrum prediction process, based on experimental conditioning of the laser-induced shock acquisition
표 Comparison of SRS curves at Pt 3, depending on the laser beam energy (E) and fluence (F), under the condition of the same beam size (A = 0.21 cm2)
표 Raw and gained laser-induced shock time histories at Pt 3, depending on the laser beam size (A) and fluence (F), under the condition of the same laser beam energy
표 Comparison of SRS curve at Pt 3, depending on the laser beam size (A) and fluence (F), under the condition of the same laser beam energy
표 Raw and gained laser-induced shock time histories at Pt 3, depending on the different laser beam energy (E) and size (A), under the condition of the same fluence (F)
표 Comparison of SRS curve at Pt 3, depending on the laser beam size (A) and energy (E), under the condition of the same laser beam fluence
표 MAD with respect to the cut-off frequency of the in-line band-pass filter
표 MAD with respect to the cut-on frequency of the in-line band-pass filter
표 Distance dependent attenuation characteristics of laser-induced shock signals: (a) Attenuation curve using the laser-induced shock signals at the four points, and (b) Initial, optimized and constant gains along the distance
표 SRS curve and MAD comparison between the pyroshock and laser-induced shocks at (a) Pt 1, (b) Pt 2, (c) Pt 3, and (d) Pt 4, in the cases of the initial, optimized and constant gains
표 MADs (%) in using the initial, optimized and constant gains in the repeatability tests
표 Overall experimental setup for pyroshock signal measurement in field
표 Position of detonation location and three sensing points on the 1.34 mm thick face sheet CFRP sandwich panel
표 Pyroshock sensing and laser shock excitation points
표 (a) Real pyroshock signals, (b) laser-induced shock signals with optimal conditions
표 Sensor layout for estimation of the principal wave speed and direction
표 Experiment setup for the laser shock measurement, with the three excitation points in the same test plate for pyroshock: (a) configuration of Laser shock measurement system, (b) multiple sensors array to describe the linear explosion
표 Flowchart of linear explosive-induced pyroshock reconstruction process using experimentally conditioned laser shock
표 Pyroshock response spectrum prediction process
표 Optimal experimental conditions
표 SRS comparison between conditioned laser SRS and pyroshock SRS for (a) Pt1, (b) Pt2, and (c) Pt3 at the time delay of Δτ= 6.33㎲
표 Pyroshock sensing and laser-induced shock excitation points
표 Schematic diagram of experiment setup for the laser-induced shock measurement, with the four excitation points in the same test plate for pyroshock
표 MAD with respect to the cut-on frequency
표 MAD with respect to the cut-off frequency
표 MAD with respect to the cut-on frequency and the cut-off frequency
표 Optimal experimental conditions
표 Distance dependent attenuation characteristics of laser-induced shock signals: (a) Attenuation curve using the laser-induced shock signals at the four points, and (b) Initial, optimized and constant gains along the distance
표 SRS curve and MAD comparison between the pyroshock and laser-induced shocks at (a) Pt 1, (b) Pt 2, (c) Pt 3, and (d) Pt 4, in the cases of the initial, optimized and constant gains
표 MADs (%) in using the initial, optimized and constant gains in the repeatability tests
표 Overview of pointwise explosive-induced pyroshock prediction scheme
표 Training algorithms used in SRS training processes
표 Training algorithm of amplitude attenuation and time-of-flight estimation models
표 Training algorithm of RMS-amplitude attenuation and ToF estimation models
표 SRS reconstruction algorithm
표 Time-domain waveform reconstruction process: (a) Time-domain waveform reconstruction algorithm, and (b) RMS acceleration signal processing algorithm
표 SRS curve comparison between the reference pyroshock signal and the conditioned laser shock signal reconstructed with hieratical subband decomposition at (a) Point 1, (b) Point 2, (c) Point 3, and (d) Point 4 in cases of three different N bandpass filters in Level 2
표 Mean acceleration difference (%) in SRS between the conditioned laser shock signals based on training process and verification process
표 SRS curve comparison between reference pyroshock signal and conditioned laser shock signals with and without trained estimation models at (a) Point 1, (b) Point 2, (c) Point 3, and (d) Point 4
표 SRS curve comparison between the reference pyroshock signal and the conditioned laser shock signals, which were constructed with trained estimation models at (a) Point 5, (b) Point 6, (c) Point 7, and (d) Point 8
표 Peak-to-peak acceleration difference (PAD) performance comparison in various frequency range f1 to f3
표 Peak-to-peak acceleration difference (%) in conditioned laser shock signals between the case without and with trained models based on
표 Time-domain waveform comparison between reference pyroshock signals and conditioned laser shock signals which reconstructed with trained estimation models at (a) Point 1, (b) Point 2, (c) Point 3, and (d) Point 4
표 Time-domain waveform comparison between reference pyroshock signals and conditioned laser shock signals, which were reconstructed with trained estimation models at (a) Point 5, (b) Point 6, (c) Point 7, and (d) Point 8
표 Mean acceleration difference (%) in SRS between the conditioned laser shock signals and reference mechanical shock signals
표 SRS curve comparison between the reference mechanical shock signal and the conditioned laser shock signal reconstructed with hieratical subband decomposition at (a) Point 1, (b) Point 2, and (c) Point 3 in cases of three different N bandpass filters in Level 2
표 Mean acceleration difference (%) in SRS between the conditioned laser shock signals based on training process and verification process
표 SRS curve comparison between reference mechanical shock signal and conditioned laser shock signals with and without trained estimation models at (a) Point 1, (b) Point 2, and (c) Point 3
표 SRS curve comparison between the reference mechanical shock signal and the conditioned laser shock signals, which were constructed with trained estimation models at (a) Point 4, (b) Point 5, and (c) Point 6
표 Time-domain waveform of the conditioned laser shock, which were constructed with trained estimation models of SRS reconstruction at (a) Point 1, (b) Point 2, and (c) Point 3
표 Peak-to-peak acceleration difference (%) in time-domain waveform between the conditioned laser shock signals, which generated based on trained models of SRS reconstruction, using training set and verification set data
표 Time-domain waveform of the conditioned laser shock, which were constructed with trained estimation models of SRS reconstruction at (a) Point 4, (b) Point 5, and (c) Point 6
표 Mean acceleration difference (%) in SRS between the conditioned laser shock signals and reference linear-source pyroshock signals
표 SRS curve comparison between the reference linear-source pyroshock signal and the conditioned laser shock signal reconstructed with hieratical subband decomposition at (a) Point 1, (b) Point
표 Mean acceleration difference (%) in SRS between the conditioned laser shock signals based on training process and verification process
표 SRS curve comparison between reference linear-source pyroshock signal and conditioned laser shock signals with and without trained estimation models at (a) Point 1, (b) Point 2, and (c) Point 4
표 Time-domain waveform of the conditioned laser shock, which were constructed with trained estimation models of SRS reconstruction at (a) Point 1, (b) Point 2, and (c) Point 4
표 Time-domain waveform of the conditioned laser shock, which were constructed with trained estimation models of time-domain reconstruction at (a) Point 1, (b) Point 2, and (c) Point 4
표 Mean acceleration difference (%) in SRS between the conditioned laser shock signals and reference PZT shock wavess
표 SRS curve comparison between the reference PZT shock wave and the conditioned laser shock signal reconstructed with hieratical subband decomposition at (a) Point 1, (b) Point 2, (c) Point 3 and (d) Point 4 in cases of three different N bandpass filters in Level 2
표 SRS curve comparison between reference PZT shock signal and conditioned laser shock signals with and without trained estimation models at (a) Point 1, (b) Point 2, (c) Point 3, and (d) Point 4
표 Mean acceleration difference (%) in SRS between the conditioned laser shock signals based on training process and verification process
표 SRS curve comparison between the reference PZT shock signal and the conditioned laser shock signals, which were constructed with trained estimation models at (a) Point 5, (b) Point 6, and (c) Point 7
표 Time-domain waveform of the conditioned laser shock, which were constructed with trained estimation models of SRS reconstruction at (a) Point 1, (b) Point 2, (c) Point 3, and (d) Point 4
표 Time-domain waveform of the conditioned laser shock, which were constructed with trained estimation models of SRS reconstruction at (a) Point 5, (b) Point 6, and (c) Point 7
표 the GUI-based system operation software
표 (a) Measured pyroshock signals and Its (b) SRS curves at each sensing point
표 FPGA based signal processing board with multi-channel ADC card
표 Specifications summary for multi-channel DAQ board
표 FM680 FPGA XMC
표 FMC116 block diagram
표 SMA breakout cable
표 FMC116 FPGA mezzanine card
표 4FM GUI control application
표 PCI data/command flow
표 Memory test using reference software
표 Top Logic diagram for reference firmware design with FMC116
표 Test result for FMC116 Reference design
표 Block diagram for multi-channel DAQ design
표 Firmware design for multi-channel DAQ
표 Firmware architecture of FMC116 module
표 Timing diagram for simultaneous data capture
표 Timing diagram for channel acquisition delay
표 Timing diagram for decimation of sampling frequency
표 Experiment setup to verify clock decimation
표 Test results for sampling clock decimation
표 Block diagram for memory interfacing
표 Schematic diagram of our design for memory interfacing
표 Data format for write cycle
표 Timing diagram for write cycle
표 Timing diagram for read cycle
표 Main window of LSS GUI
표 GUI for inspection parameter settings
표 Hardware and wiring installation configuration
표 PZT contact sensor
표 (a) Q-switched laser Head and laser controller. (b) RS232/USB cable
표 (a) Laser mirror scanner. (b) LMS External card driver
표 Hardware setup for Laser shock sensing system and beam generation
표 Laser navigator sub-window
표 Inspection summary for laser shock sensing using Qt application
표 (a) laser shock measurement point and scan area, and (b) multiple sensors array to describe the linear explosion
표 Fifteen laser-induced shock waves acquired at each channel
표 Fifteen laser-induced shocks acquired by multi-channel and laser-induced shock after superposition with a time delay
표 Illustration of (a) scanning path on the scanning area, (b) signal saved, and (c) shock wave signal structure and sliced along the time axis
표 Laser shock wave propagation Imaging based on the time delay 10 μs at the snapshot of 142 μs
표 Scanning imaging of test plate were captured at (a) 0 sec, (b) 35 sec, (c) 75 sec , and (d) 102 sec
표 Block diagram for memory interfacing
표 Flow chart for on the fly data transfer method
표 Timing diagram for data transfer
표 Comparison of data type for device utilization and latency
표 Shock signal comparison between 16 bit, 32 bit and 64 bit integers
표 Comparison for precision between single precision floats, double precision floats and fixed point
표 Maximum number of samples available at 1 MHz sampling frequency
표 Overview of pyroshock prediction scheme
표 Decomposition of the reference pyroshock signal at Pt1 with the bandwidths of (a) 100 Hz to 1 kHz, (b) 1 kHz to 10 kHz, (c) 10 kHz to 100 kHz, and (d) direct synthesizing of the decomposed signals
표 Comparison between the reference SRS curve and the pyroshock SRS curve decomposed in the frequency band of (a) 100 Hz to 1 kHz, (b) 1 kHz to 10 kHz, (c) 10 kHz to 100 kHz, and (d) comparison between the reference SRS curve and the SRS curve superposed with the decomposed three pyroshock signals
표 Time domain waveform training process
표 SRS training algorithm
표 Mean acceleration difference (%) in SRS and peak-to-peak acceleration difference (%)
표 Comparison of time domain signals and SRS curves at (a) point 1, (b) point 2, (C) point 3 and (d) point 4
표 Mean acceleration difference (%) in SRS and peak-to-peak acceleration difference (%)
표 Comparison of time domain signals and SRS curves at (a) point 1, (b) point 2 and (C) point 3
표 (a) Q-switched laser head and laser controller, (b) Laser mirror scanner, and (c) Scanalone board cabinet
표 Trigger connection to initialize scanning and data capture
표 Block diagram for memory controller design
표 GUI platform of multi-point simultaneous laser shock sensing system
표 Trained results on GUI platform
표 Noncontact explosive-induced shock measurement system and multipoint simultaneous laser shock sensing system
표 (a) R-Cast M204A sensor sensitivity data sheet (b) FFT result of arbitrary laser shock obatined by R-Cast M204A sensor
표 Pyroshock simulation algorithm flow chart
표 Pyroshock measurement process scheme
표 Laser shock measurement process scheme; (a) PC and GUI platform (b) Thermo-elastic mechanism (c) Arbitrary laser shock time domain signal (d) Laser scanning data
표 Modal analysis process scheme; (a) Modal analysis results (b) Laser scanning data
표 Laser shock wave form training using 2-parameter exponential decay function; (a) Waveform training algorithm (b) Laser shock and pyroshock signal (b) Waveform trained laser shock signal and pyroshock signal
표 (a) 2-parameter exponential decay function (b) 4-parameter exponential decay function
표 Laser shock wave form training using 4-parameter exponential decay function; (a) Waveform training algrotigh (b) Laser shock and pyroshock signal (b) Waveform trained laser shock signal and pyroshock signal
표 Time domain signal simulation scheme
표 (a) Characteristic of Butterworth filter (b) Unremoved stop band signal
표 (a) Pyroshock wave propagation image (b) Shock response spectrum image
표 Experimental setup for pyroshock reduction study according to explosion position
표 Pyroshock measurement setup for pyroshock reduction study according to explosion position
표 Data acquisition condition for pyroshock measurement
표 Laser shock measurement setup for pyroshock reduction study according to explosion position
표 Data acquisition condition for laser shock measurement
표 Comparison of real pyroshock and simulated pyroshock at test1
표 Comparison of real pyroshock and simulated pyroshock at test2
표 Pyroshock simulation results for pyroshock reduction study according to explosion position
표 Experimental setup for pendulum test
표 Results of pendulum test
표 (a) Real satellite-equipped electronic equipment (b) simulated specimen
표 Measurement setup of pyroshock for simulation of initiator induced pyroshock on AL 6061 plate
표 Data acquisition condition for pyroshock measurement
표 Pyroshock measurement case classification; (a) steel mount – steel mount (b) rubber mount – steel mount (c) steel mount – rubber mount
표 Measurement setup of laser scanning for simulation of initiator induced pyroshock on AL 6061 plate
표 Data acquisition condition for laser shock measurement
표 Laser shock measurement case classification; (a) steel mount – steel mount (b) rubber mount – steel mount (c) steel mount – rubber mount
표 Experimental setup of test 1 (steel mount – steel mount)
표 Comparison of real pyroshock and simulated pyroshock at training point – test 1
표 PWPI at 930㎲ and SRSI at 10kHz - test1
표 Comparison of real pyroshock and simulated pyroshock at verification point - test1
표 Experimental setup of test 2 (rubber mount – steel mount)
표 Comparison of real pyroshock and simulated pyroshock at training point – test 2
표 PWPI at 930㎲ and SRSI at 10kHz - test 2
표 Comparison of real pyroshock and simulated pyroshock at verification point – test 2
표 Experimental setup of test 3 (steel mount – rubber mount)
표 Comparison of real pyroshock and simulated pyroshock at training point – test 3
표 PWPI at 930㎲ and SRSI at 10kHz - test 3
표 Comparison of real pyroshock and simulated pyroshock at verification point – test 3
표 Peak to peak acceleration results at each test
표 Similarity level between real pyroshock and simulated pyroshock at each test
표 Pyroshock reduction study using shock insulation materials based on pyroshock simulation results
표 Measurement setup of 1/2 inch explosive bolt induced pyroshock on type 1 specimen
표 Data acquisition condition of 1/2 inch explosive bolt induced pyroshock on type 1 specimen
표 Measurement setup of laser scanning for simulation of pyroshock on type 1 specimen
표 Data acquisition condition of laser scanning for simulation of pyroshock on type 1 specimen
표 Comparison of real pyroshock and simulated pyroshock at training point; (explosive bolt –type 1)
표 PWPI at 300㎲ and SRSI at 1kHz, 3kHz and 30kHz ; (explosive bolt –type 1)
표 Comparison of real pyroshock and simulated pyroshock at verification point; (explosive bolt –type 1)
표 Measurement setup of 1/2 inch pyrolock induced pyroshock on type 1 specimen
표 Data acquisition condition of 1/2 inch pyrolock induced pyroshock on type 1 specimen
표 Comparison of real pyroshock and simulated pyroshock at training point; (pyrolock –type 1)
표 PWPI at 300㎲ and SRSI at 1kHz , 3kHz and 30kHz ; (pyrolock –type 1)
표 Comparison of real pyroshock and simulated pyroshock at verification point; (pyrolock –type 1)
표 Measurement setup of 1/2 inch explosive bolt induced pyroshock on type 2 specimen
표 Data acquisition condition of 1/2 inch explosive induced pyroshock on type 2 specimen
표 Comparison of real pyroshock and simulated pyroshock at training point; (explosive bolt –type 2)
표 PWPI at 300㎲ and SRSI at 1kHz, 3kHz and 30kHz; (explosive bolt –type 2)
표 Measurement setup of 1/2 inch pyrolock induced pyroshock on type 2 specimen
표 Data acquisition condition of 1/2 inch pyrolock induced pyroshock on type 2 specimen
표 Comparison of real pyroshock and simulated pyroshock at training point; (pyrolock –type 2)
표 PWPI at 300㎲ and SRSI at 1kHz, 3kHz and 30kHz; (pyrolock –type 2)
표 Comparison of each pyroshock signal at temporal and spectral domain
표 Peak to peak acceleration results at each test
표 Pyroshock reduction study depending on structural shape and fastening method based on pyroshock simulation results
표 Similarity level between real pyroshock and simulated pyroshock at each test
표 (a) Real KSLV-2 graphic demonstration, (b) real Satellite-equipped electronic equipment, (b) simulated specimen
표 (a) Pyroshock measurement environment, (b) detailed measurement points and source point
표 Data acquisition condition for pyroshock measurement
표 (a) Laser scanning and lasershock measurement environment, (b) Detailed scan area and sensing position
표 Data acquisition condition for laser shock measurement
표 Simulation result at training points
표 (a) PWPI snapshot at 880㎲ on interested area, (b) SRSI at 10kHz on interested area
표 Simulation result at verification points
표 (a) Real satellite-payload attach fitting, (b) simulated specimen 3D sketch, (c) manufactured specimen and pyro-device fastening position
표 (a) Pyroshock measurement environment, (b) detailed measurement points and source position
표 Data acquisition condition for pyroshock measurement
표 (a) Laser scanning and laser shock measurement environment and sensor position, (b) detailed laser scan area
표 Data acquisition condition for laser shock measurement
표 Simulation result at training points
표 (a) PWPI snapshot at 883 ㎲ on interested area, (b) SRSI at 70kHz on interested area
표 Simulation result at verification points
표 (a) Real payload attach fitting-payload bay, (b) simulated specimen 3D sketch
표 (a) Pyroshock measurement environment, (b) detailed measurement points and source position
표 Data acquisition condition for pyroshock measurement
표 (a) Laser scanning environment, (b) tilting specimen (40°) for vertical laser incident scan, (c) detailed sensor position, (d) laser scan area
표 Data acquisition condition for laser shock measurement
표 Simulation result at training points
표 (a) PWPI snapshot at 168 ㎲ on interested area, (b) SRSI at 27 kHz on interested area
표 Simulation result at verification points

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레이저 충격파 기반 발사체 파이로 충격파 전파 고속 가시화 시작품 개발 및 충격 저감구조 연구
Fast Visualization Prototype Development for Space Launcher Pyroshock Propagation using Laser Shock and Study on Shock Reduction Structures 원문보기

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레이저 충격파 기반 발사체 파이로 충격파 전파 고속 가시화 시작품 개발 및 충격 저감구조 연구
Fast Visualization Prototype Development for Space Launcher Pyroshock Propagation using Laser Shock and Study on Shock Reduction Structures 원문보기

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