Ultrasonic Signal Analysis of Solid Propellant Using Hilbert Transform

Lin Yun; Dongryun Kim; Iksoo Park; Sungju Han; Hyung Sub Sim

doi:10.6108/KSPE.2024.28.4.020

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2024 Vol.28, Issue 4 Preview Page Next Page

RESEARCH PAPERS

Ultrasonic Signal Analysis of Solid Propellant Using Hilbert Transform 힐버트 변환 신호처리 기법을 활용한 고체추진제의 초음파 신호 분석에 관한 연구

31 August 2024. pp. 20-28

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Abstract

While the ultrasound technique has demonstrated efficiency in measuring the regression rate of solid propellants, the associated challenge of detecting highly attenuated echoes of ultrasound signals needs to be addressed. The present study constructed an experimental apparatus consisting of an ultrasonic pulser/receiver, a multiplexer, an oscilloscope, and a 0.5 MHz probe, and conducted ultrasound thickness measurements with two types of samples. The Hilbert transform was utilized to obtain the signal envelope and MRL(Mean Resultant Length) by extracting the amplitude and phase characteristics from the measured ultrasonic signals. The signal envelope was found to be unsuitable for low-level echo detection as it significantly decayed along with the attenuating echoes, whereas the MRL enabled the detection of low-level echoes. However, the signal processing method developed in this work exhibited a slight increase in uncertainty for the time-of-flight (TOF) measurement for the highly attenuating samples. Further studies are ongoing to enhance the precision of this ultrasonic technique and apply it to measure the regression rate in solid-fuel ramjets.

Keywords

Ultrasonic Technique

Hilbert Transform

Signal Envelope

Mean Resultant Length

Solid Fuel

초음파 기법은 고체추진제의 후퇴율을 측정하는데 효율적이지만, 연소관, 내열재, 라이너, 추진제가 결합된 다층 구조에서 심한 감쇠로 인해 반사신호의 식별이 어렵다. 본 연구에서는 고체추진제의 초음파 측정을 위한 측정장치를 설계하였고, 비활성 추진제 및 내열 고무 샘플에 대한 두께 측정 실험을 수행하였다. 반사신호 식별을 위해서 힐버트 변환 기법을 활용하여 측정한 초음파 신호의 진폭, 위상특성을 분석하였고 신호 포락선(Signal envelope)과 MRL(Mean Resultant Length)을 도출하였다. 초음파 측정장치는 초음파 펄서/리시버, 오실로스코프, 피코스코프와 0.5 MHz 주파수의 탐촉자로 구성되며, 두 가지 종류의 샘플에 대해서 초음파 신호를 측정하였다. 힐버트 변환을 적용한 결과, 신호 포락선의 진폭이 반사신호의 감쇠로 인해 크게 감소하여, 잡음과 구별하기 어려움을 확인했다. 반면, MRL을 사용하면 높은 감쇠율의 반사신호를 증폭시켜 식별할 수 있었다. 그러나, 감쇠율이 높은 샘플에 대해 힐버트 신호처리 기법을 적용하면 왕복 진행시간의 최대 오차율이 소폭 증가하는 것을 확인했다. 이에 따라, 추가 연구를 통해 초음파 측정의 정확도를 향상시킬 예정이며, 이러한 개선된 기법을 고체연료 램제트 연소 실험에 적용하여 연료의 두께 및 후퇴율을 정밀하게 측정할 계획이다.

키워드

초음파 기법

힐버트 변환

신호 포락선

평균 결과 벡터 길이

고체연료

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Information

Publisher :The Korean Society of Propulsion Engineers
Publisher(Ko) :한국추진공학회
Journal Title :Journal of the Korean Society of Propulsion Engineers
Journal Title(Ko) :한국추진공학회지
Volume : 28
No :4
Pages :20-28
Received Date : 2024-06-11
Revised Date : 2024-08-01
Accepted Date : 2024-08-06
DOI :https://doi.org/10.6108/KSPE.2024.28.4.020

Journal of the Korean Society of Propulsion Engineers ISSN:1226-6027(Print) 2288-4548(Online) 한국추진공학회지

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