HERO 시험평가 기법 연구

신승제,Shin, Seung-Je 한국군사과학기술학회 2007 한국군사과학기술학회지 Vol.10 No.2

This report presents the test technique using optic thermal sensor for the HERO evaluation of equipment installed EED. The calibration method of EED-thermal sensor assembly is explained by relation between the current in bridge wire and voltage in thermal sensor. And the HERO test and evaluation method is indicated based on MIL-STD-464A and MIL-STD-331C. The safety and reliability levels of EED-thermal sensor assembly are evaluated when exposed in the electromagnetic environment.

지능형 유도 탄약의 신뢰성 향상을 위한 항법센서 고장탐지 및 대응기법

신승제(Seung-Je Shin),김환우(Whan-Woo Kim) 대한전자공학회 2018 전자공학회논문지 Vol.55 No.7

포발사 유도 탄약은 유도탄과 달리 발사초기 강한 물리적 충격을 받게 된다. 유도 탄약 내부에 장착된 항법센서(INS, Inertia Navigation System)인 가속도계 및 자이로가 포발사 충격에 손상되지 않는다면, 비행중 항법 초기화가 가능하게 되고 일반적인 순수 항법알고리즘을 이용하여 탄의 현재상태를 추측하여 유도조종을 수행할 수 있으며 최종적으로 표적타격 정확도를 향상시킬 수 있다. 하지만 탑재된 항법센서의 일부 또는 전체에서 고장이 발생한다면 표적오차를 증가시키는 방향으로 유도조종을 수행할 확률이 매우 높아진다. 이 논문에서는 포발사 유도 탄약에 장착된 항법센서(가속도계 및 자이로)의 고장 상황에서 탄약의 표적타격 정확도를 최대한 유지하기 위해, 가용한 센서 정보를 이용한 근사적인 항법해를 도출하는 알고리즘을 제안 하였다. 이를 위해 각각의 센서 출력값 변화에 따라 센서의 정상/성능저하/고장을 판단하였으며, 이 정보를 이용하여 성능저하 상황에서는 센서 측정치와 시스템 예측값을 조합하여 탄약의 현재 상태를 추정하고 고장상황에서는 정상 측정되는 타센서의 정보를 이용하여 근사적 항법해를 도출하는 시스템을 설계하였다. 마지막으로 제안한 알고리즘의 적용을 통해 항법센서 고장에 따른 포발사 유도 탄약의 성능저하가 효과적으로 개선됨을 확인하였다. Unlike guided missiles, guided ammunitions are subject to strong physical shocks at launch. If the accelerometer and gyroscope (INS, Inertia Navigation System) installed in the guided ammunition are not damaged by the impact of the shooter, it will be possible to initialize the navigation in flight and estimate the current state of the ammunition using general basic navigation algorithm guided controls can be performed, and finally the target striking accuracy can be improved. However, if a fault occurs in some or all of the mounted navigation sensors, the probability of performing the guided control in the direction of increasing the target error becomes very high. In this paper, we propose an new algorithm to derive an approximate navigation solution using the available sensor information in order to maintain the target hit accuracy of the ammunition in the fault situation of the some navigation sensor (accelerometer and gyro) mounted on the guided ammunition. For this purpose, the normal / performance deterioration / fault of the sensor was determined according to the change of each sensor output value. In the case of performance degradation using this information, the current state of the ammunition is estimated by combining the sensor measurement value and the system predictive value. In the case of fault, the system is designed to derive an approximate navigation solution using information from other sensors. Finally, it was confirmed that the deterioration of ammunition performance due to the failure of the navigation sensor was effectively improved through the application of the proposed algorithm.

좌표계 변환을 통한 롤 각 추정기법의 적용가능성 연구

신승제(Seung-Je Shin),김철영(Chul-Young Kim) 대한전자공학회 2020 전자공학회논문지 Vol.57 No.10

항법/유도조종이 가능한 지능형 탄약은 발사초기 열악한 환경(충격, 회전)을 극복하기 위한 내고충격 전자장치를 내장하고 있다. 하지만 짧은 순간에 강한 충격과 고속 회전이 인가되기 때문에 항법 수행을 위한 초기정렬은 불가능 하고 발사 직후 충격량에 의해 작동하는 열전지에 의해 전원인가 및 초기화가 이루어진다. 위성항법장치(GPS, Global Positioning System)와 관성항법장치(INS, Inertial Navigation System)를 이용한 비행 중 항법 초기화를 위해 가장 필요한 것은 롤 각 추정이다. 포강의 강선에 의해 발생하는 초당 20∼30회의 회전력 때문에 롤 각을 추정하는 것은 매우 어려우며 많은 오차를 발생시킨다. 선진국에서 개발 완료된 지능탄약인 M982(Excalibur)의 경우 GPS 수신강도 변화와 회전율을 이용하여 롤 각을 추정한다. 이 방법은 회전율이 일정시간 동안 일정하게 유지되지 않으면 추정 정확도가 떨어지는 등 문제가 있다. 이러한 문제를 개선하기 위해 회전율에 관계없는 새로운 롤 각 추정기법을 제안한바 있다[14]. 이 논문에서는 기 제안한 롤 각 추정기법의 오차가 지능형 탄약의 통합항법과 유도조종에 미치는 영향을 확인하였으며 최종 탄착 정확도 분석을 통해 적용 가능성함을 확인하였다. 이를 위해 성능분석 시스템을 구성하였으며 다양한 유도 기법에서 성능저하가 없음을 확인 하였다. The intelligent ammunition capable of navigation/guided control has built-in high-impact electronics to overcome strong impact and high-speed rotation at the beginning of launch. However, since strong shock and high-speed rotation are applied in a short moment, initial alignment for navigation is impossible, and power is applied and initialized by a thermoelectric battery operated by the amount of shock immediately after launch. The roll angle estimation is the most necessary for initializing navigation during a flight using a Global Positioning System(GPS) and Inertial Navigation System(INS). It is very difficult to estimate the roll angle due to the rotational force of 20 to 30 times per second caused by the steel wire of the gun barrel, and it causes many errors. In the case of M982(Excalibur), an intelligent ammunition developed in united states, the roll angle is estimated by using the change in GPS reception intensity and rotation rate. This method has problems such as poor estimation accuracy if the rotation rate is not kept constant for a certain period of time. To solve this problem, a new roll angle eestimation technique was proposed that is independent of the rotation rate<SUP>[14]</SUP>. In this paper, it was confirmed that the error of the recently proposed roll angle estimation technique does not affect the integrated navigation and guided control of intelligent ammunition, and further confirmed the applicability through the final target hitting accuracy analysis. For this, performance analysis was constructed and it was confirmed that there was no performance degradation in various guidance techniques.

지능형 유도탄약의 회전각 추정기법

신승제(Seung-Je Shin),김경훈(Gyeong-Hun Kim),김환우(Whan-Woo Kim) 대한전자공학회 2019 전자공학회논문지 Vol.56 No.3

포발사 지능형 유도탄약은 일반 유도탄과 달리 극한의 초기발사조건 때문에 탄약의 초기자세 설정이 불가능하다. 또한 발사초기 강한 물리적 충격을 받으므로 유도탄약 내부에 장착된 GPS(Global Position System) 및 관성항법장치(INS, Inertia Navigation System)는 전원이 인가되지 않은 상태에서 발사가 되고, 비행 중 항법 초기화를 통해 탄의 현재 상태를 추정하여 유도조종을 수행할 수 있으며 최종적으로 표적타격 정확도를 향상시킬 수 있다. 하지만 포발사 탄약의 특성에 따라 포강의 강선에 의해 발생하는 초당 20∼30회의 회전력 때문에 탄약의 회전각을 추정하는 것은 매우 어려우면서도 많은 오차요인을 가지고 있다. 선진국에서 개발 완료된 지능형 유도탄약인 M982(엑스켈리버)의 경우 GPS 수신강도 변화와 회전율을 이용하여 회전각을 추정한다. 이 방법은 회전율이 일정시간 동안 일정하게 유지되지 않으면 추정 정확도가 떨어지는 등 문제가 있다. 이 논문에서는 지능형 유도탄약에 탑재된 GPS 측정치의 미분/회전변환 후 INS의 가속도 데이터와 비교하거나 INS 측정치의 적분/회전변환 후 GPS 속도 데이터와 비교함으로써 회전각을 예측하는 기법을 제안 하였다. 제안한 기법은 유도탄약의 성능분석프로그램을 통해 획득한 모의데이터를 통해 기능을 확인 하였으며, 실제 포발사 시험에서 획득된 원격측정장치 데이터를 이용하여 성능을 검증하였다. Unlike conventional guided missiles, the intelligence gun-guided ammunition cannot set the initial position because of initial conditions of an extremity that is subject to a strong physical shock at the beginning of launch. Therefore the GPS and INS installed inside the intelligence guided ammunition are launched without power applied. The current state of the ammunition is estimated by the navigation initialization during the flight. After that, the ammunition has undergo guided control and finally the target striking accuracy can be improved. However, it is very difficult to estimate the rotation angle of the ammunition because of the 20∼30 rotations per second caused by the rifling inside the gun bore due to the characteristics of cannon launch ammunition. In the case of the M982(excalibur), an intelligence guided ammunition developed in the U.S. the rotation angle is estimated using the signal intensity of GPS and rotation rate. This method has a problem in that the roll angle estimation accuracy is significantly lowered unless the rotation rate is maintained constant for a certain period of time. In this paper, we propose a method to estimate rotation angle by comparing the acceleration data of INS after differential/rotation conversion of GPS measurements or by comparing the velocity data of GPS after integration/rotation conversion of INS measurements mounted on intelligent guided ammunition. The proposed algorithm was verified by simulation data obtained form the performance analysis program of ammunition and once again verified using telemetry data obtained from actual cannon launch test.

포발사 탄약에 적합한 3차원 유도법칙의 성능개선 기법

신승제(Seung-Je Shin ),김환우(Whan-Woo Kim) 한국항공우주학회 2018 韓國航空宇宙學會誌 Vol.46 No.8

이 논문에서는 정밀유도 포탄의 성능향상을 위한 유도기법을 제안하였다. 본 논문에서 제안하는 기법은 탄의 운동특성분석 없이 탄도와의 오차를 최대한 줄여 탄약의 표적오차를 줄이기 위해서 고안한 기법이다. 이 기법은 탄약의 회전 및 세차운동으로 발생하는 탄내 장착 관성센서의 출력 변동폭을 줄이기 위해 신호처리 기법으로 많이 사용되는 이동평균필터 기법을 적절히 응용한 것으로 관성센서 출력값을 보정하는 것이 목적이다. 단순히 3차원 유도조종 기법을 적용한 경우와 개선기법을 포함하여 적용한 기법의 성능을 비교하였으며, 명확한 성능개선을 확인하였다. 이 기법의 적용으로 유도탄과는 달리 가혹한 환경조건 및 불규칙한 운동 특성을 가지는 포발사 탄약의 탄착 정확도가 개선되는 것을 확인하였다. In this paper, we propose a method to improve the performance by guidance technique and applying it to the precision guided ammunition. The proposed method is a technique designed to reduce the target error of ammunition by reducing the projectile error without analyzing the motion characteristics of the shot. This technique is applied to the moving average filter technique which is widely used as signal processing technique to reduce the fluctuation of the output of the inboard mounting inertial sensor caused by the rotation and the coning motion of the ammunition. In order to compare the performance of the applied technique including the simple 3D guided control technique and the proposed improvement technique. It is confirmed that the application of this technique improves the accuracy of impact of the cannon - launched ammunition with severe environmental conditions and irregular motion characteristics unlike the missile.

함정 발생 수중 전자기장 신호의 특성 및 측정 기법

양창섭,정현주,신승제,Yang, Chang-Seob,Chung, Hyun-Ju,Shin, Seung-Je 한국군사과학기술학회 2006 한국군사과학기술학회지 Vol.9 No.2

The underwater electromagnetic signatures of a naval ship are mainly generated from three sources which are the permanent and induced magnetic field in the ship's hull and other ferrous components, the cathodic current electromagnetic field established by the Impressed Current Cathodic Protection(ICCP) system or the Sacrificial Anode and the stray electromagnetic fields generated by onboard equipment. These signatures can be minimized by certain design methods or installation of signature reduction equipment. In this paper, we represented the characteristic of the underwater electromagnetic signature and the signature reduction techniques for a naval ship. Also, we measured the electromagnetic field changes emitted from the real ship using the Electric and Magnetic field Measurement System(EMMS). We found that the underwater electromagnetic signature for a naval ship can be used as input or trigger signal in a surveillance system and an influence mine.

고유수용성 신경근 촉진법 하지 패턴에 기초한 탄력밴드 훈련이 만성 편마비 환자의 보행에 미치는 영향

김좌준,김광일,김도환,성용인,신승제,Kim, Jwa-Jun,Kim, Gwang-Il,Kim, Do-Whan,Sung, Yong-In,Shin, Seung-Je 대한고유수용성신경근촉진법학회 2007 PNF and Movement Vol.5 No.2

Purpose : The purpose of this study were to determine the effect of a Elastic Theraband Exercise Based of PNF L/E pattern on the gait of the chronic Hemiplegic Patients. Methods : We selected the 20 chronic Hemiplegic Patients not given treatment now and divided them into two groups of both 10 Elastic Theraband group and 10 Self Exercise. The first group went through a Elastic Theraband Exercise Based of PNF L/E pattern 30 minutes a day, 5 times a week, for 6 weeks. Exercise used to blue elastic band which 2 patterns of PNF by 1) hip extension - abduction - internal rotation with knee extension. 2) hip flexion - adduction - external rotation with knee flexion. The latter group experienced Self Exercise, 30 minutes a day, 5 times a week, for 6 weeks. Firstly, we measured the absolute improvement of gait velocity(m/s), cadence(steps/min) among walking characters. Secondly, we measured the functional walking ability such as Functional Ambulatory Category(FAC, score out of 5), Modified Motor Assesment Scale(MMAS, score out of 6). Data analysis was performed with using SPSS 12.0 win program. The descriptive analysis was used to obtain average and standard deviation. The independent t-test and the paired t-test were used to compare both the groups about pre and post training test. Treatment effects were established by pre and post assessment. Subjects tolerated the training well without side-effects. Therefore, the results of this study were as follows; Results : 1. There was a more significant improvement of Gait velocity(0.12m/s) Elastic Theraband group(p<.05). 2. There was a more significant improvement of cadence(9.40steps/min) Elastic Theraband group(p<.05). Conclusion : As we can see from above, the findings suggest that Elastic Theraband may be more effective than the Self Exercise for improving some gait parameters such as Gait velocity and Cadency. This conclusion also suggest that Elstic Theraband is more effective for the improvement of gait of chronic Hemiplegic Patients.

탄성력을 이용하여 전개하는 날개의 분석을 위한 3차원 유체구조 연계 해석

김종록(Jong Rok Kim),강병덕(Byung Duk Kang),박지은(Ji Yun Park),신승제(Seung Je Shin),방재원(Jae Won Bang) 한국항공우주학회 2017 한국항공우주학회 학술발표회 논문집 Vol.2017 No.11

양방향 유체 구조 연계 해석 기법을 이용한 날개 전개 해석

김종록(Jong Rok Kim),곽인근(Einkeun Kwak),강병덕(Byungduk Kang),나형진(Hyungjin Na),신승제(Seung Je Shin),방재원(Jaewon Bang) 한국전산유체공학회 2020 한국전산유체공학회지 Vol.25 No.1

Fluid-structure interaction analysis was performed to predict a time of wing deployment using eleatic force and centrifugal force. The Fluent for flow domain and ANSYS-Mechanical for structure domain were applied for fluid-structure interaction simulations. The loosely coupling method exchange force and displacement between two solvers each other at every coupling iteration. The structure alone analysis results showed that the wing’s elastic force, inertia and centrifugal force were well reflected. Fluid structure interaction analysis results showed that the shock wave generated at cavity in front of wings affected the wing deployment time. In addition, pressure field on each wing varied depending on the angle of attack, which caused each wing to have different deployment time.