사단법인한국소음진동공학회 The Korean Society for Noise and Vibration Engineering

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저널레터 : Trans. Korean Soc. Noise Vib. Eng., Vol. 29, No. 5 한국소음진동공학회 2019-12-05
첨부파일
2019년 10월 제 29권 제 5호 통권 250호
음향 방출 센서를 이용한 2행정 저속 디젤엔진의 상태 진단을 위한 실험적인 연구
Condition Diagnostic of Two-stroke Low-speed Diesel Engine using Acoustic Emission Sensor
동수안 틴 · 송 명 호 · 이 돈 출
Dong Xuan Thin, Myeongho Song and Don Chool Lee
Currently, condition diagnostic technologies of general machinery and their structures based on an acoustic emission sensor (AES) are widely used and applied to a variety of fields. An AES is an efficacious and powerful tool for measuring the high-frequency vibrations of reciprocating or rotating devices. Data acquisition (DAQ) and analysis software (S/W) for AES operating at high frequencies from 50kHz to 1MHz is necessary...
매트랩 언어를 이용한 선박용 디젤엔진의 음향 방출 신호 모니터링 소프트웨어 개발
Acoustic Emission Signal Monitoring Software for Marine Diesel Engine using MATLAB
송 명 호 · 벙광다오 · 이 돈 출
Myeongho Song, QuangDao Vuong and Donchool Lee
An engine/rotor vibration analysis and monitoring system (EVAMOS; brand name of Dynamic Lab. of Mokpo Maritime University) was developed to measure, monitor, store, and analyze vibration and noise data. It is highly reliable and user-friendly, therefore, it is recommended for hull and diesel engine vibration measurements based on ISO 20283-2, 20283-5, 8528-9, and class rules...
도로교통소음과 도시구성요소 관계 분석을 위한 인공신경망 모형
Artificial Neural Network Model Development based on Road-traffic Noise and Urban Form Indicators
김 필 립 · 류 훈 재 · 전 종 준 · 장 서 일
Phillip Kim, Hunjae Ryu, Jong June Jeon and Seo Il Chang
Road-traffic noise is a critical factor that affects the life and health environments of urban inhabitants. In Korea, noise maps of cities created by commercial noise mapping software are used to manage road-traffic noise. This makes the management of noisy environments easy, but in the case of metropolitan cities, the creation of noise maps is time-consuming and costly. In this study, the relationship between road-traffic noise and urban form indicators (i.e., population, roads, buildings, and land use), showing the characteristics of a city, were analyzed to predict the road-traffic noise level using a statistical model...
흡음재특성에 따른 차량 실내 음질 예측 기술
Sound Quality Prediction of Interior Noise according to the Characteristics of Sound-absorbing Materials
이 건 희 · 백 지 선 · 안 강 현 · 이 상 권 · 김 근 영
Kunhee Lee, Jisun Back, Kanghyun An, Sang Kwon Lee and Keunyoung Kim
In the early design stage, prediction of the sound quality of interior noise is useful for the NVH development of a car according to the characteristics of the absorbing material. This paper presents a method to predict the quality of interior sound in a car cabin when the acoustic characteristics of absorption materials are changed. Firstly, a model to predict the interior sound of a virtual car is proposed based on a signal processing tool...
프로펠러 BPF 유발 선체 가진력 저감을 위한 복수개 풍선의 설계

Multi-balloons Design for Suppressing Propeller BPF Induced Hull-excitation at Multi-frequencies
이 정 훈 · 이 경 준
Jeung-Hoon Lee and Kyung-Jun Lee
The marine propellers installed at the rear of ships experience the cavitation phenomenon, producing vibratory hull-excitations at several orders of blade passing frequency. The current investigation establishes a practical design method of multi air-balloons to suppress the propeller cavitation-induced excitation at multiple frequencies. The theoretical formulation begins with the existing modal series solution of a multiple scattering problem. We propose an approximated solution in a low-frequency system that is useful in the analysis and design stages. The parametric variation of the separation distance between the balloons reveals a rational proof that their mutual interaction can be ignored unless they are too close together. Therefore, it is emphasized that each balloon can be designed individually without reflection of the coupling characteristics among them.
평면파 파동 함수를 이용한 혼합 경계를 가진 임의 형상 음향 공동의 고정밀도 고유치 해석
Highly Accurate Eigenvalue Analysis of Arbitrarily Shaped Acoustic Cavities with a Mixed Boundary using Plane Wave Functions
강 상 욱
S. W. Kang
A meshfree method for a highly accurate eigenvalue analysis of arbitrarily shaped acoustic cavities with a mixed boundary, comprising rigid-wall and pressure-release boundaries, is proposed in this paper. A sound pressure at a point inside an acoustic cavity is assumed by linear superposition of the plane waves propagated from the boundaries of the cavity. First, the sound pressure is assumed as an approximate solution of the eigenvalue analysis of the cavity...
기저선 변동 제거를 위한 정수 계수 고역 통과 디지털 필터의 개선
Improvement of Integer-coefficient High-pass Filters to Eliminate Baseline Drift
김 민 규 · 안 세 진 · 정 의 봉 · 홍 진 숙
Min-Kyu Kim, Se-Jin Ahn, Weui-Bong Jeong and Chinsuk Hong
This paper focuses on the improvement of the integer-coefficient high-pass filter for baseline drift elimination. A sharp filter is required to effectively remove low-frequency noise and baseline drift. To sharpen the filter, the number of zeros and the filter order should be increased, which causes an increase in the amount of computation. An integer-coefficient high-pass filter is designed as a combination of an all-pass filter and a 0Hz bandstop filter. If a time delay independent of the computation amount is imposed on the all-pass filter, the characteristics of the filter can be changed...
경량충격음 차단성능 평가지표 및 주파수 대역별 상관성 분석
Correlation Analysis of the Evaluation Index of Lightweight Impact Sound Insulation and Frequency Bands
김 경 우 · 신 혜 경
Kyoung-woo Kim and Hye-kyung Shin
The evaluation indexes of lightweight impact sounds are given by the inverse-A and L indexes and ISO (L’n,AW). Based on the measurement results separated by 120mm and 210mm slab conditions, the correlation between the indicators was analyzed. The coefficient of determination for the 120mm slab conditions ranged from 0.9148 to 0.9794, while that of the 210mm slab conditions was from 0.7045 to 0.8955...
FE해석을 이용한 도시철도 제륜자의 스퀼 성향 분석
Squeal Propensity Analysis on Railway Shoe using the FE Analysis
신 희 혁 · 남 재 현 · 강 재 영 · 남 찬 혁 · 안 서 연 · 최 성 진
HeeHyuk Shin, Jaehyeon Nam, Jaeyoung Kang, Chanhyuk Nam, Seoyeon Ahn and Sungjin Choi
As the wheel-shoe type railway brake has clearance between the wheel and shoe, the contact area changes with variations in pressure. In this study, the squeal propensity for wheel brakes is investigated using a complex eigenvalue analysis dependent on the contact area. An FE model was constructed, with an error of no more than 8%, by performing a modal test. As the shoe is a composite material, it generally has a very large damping value...
로베드 트레일러 수송 동특성 분석 및 대형레이다 규격정립
Analysis of Transport Dynamic Property for Lowbed Trailer and Vibration Specification Establishment of Large Radar
신 동 준 · 안 상 혁 · 이 종 학 · 유 구 현 · 권 민 상
Dong-Jun Shin, Sang-Hyeok Ahn, Jong-Hak Lee, Gu-Hyun Ryu and Min-Sang Kwon
A large radar is transported using a lowbed trailer to reduce the height of the radar. As it is exposed to the vibration and impact load of the road during transportation, the radar core components, such as the antenna and DTRM, should be designed to be safely protected. In this paper, PSD data were analyzed through acceleration measurements during lowbed trailer transportation and were compared with the MIL-STD-810G METHOD 514.7C specification...
음향블랙홀 파동 전달 특성을 이용한 굽힘진동 저감용 충돌 댐퍼
Impact Damper for Reduction of Flexural Vibrations using Wave Propagation Property of Acoustic Blackholes
성 연 욱 · 정 성 영 · 양 원 석 · 박 준 홍
Yeonuk Seong, Seongyoung Jeong, Wonseok Yang and Junhong Park
To mitigate noise radiation of home appliances in audio frequency ranges, viscoelastic damping materials with the constrained layer are widely used although their performance degrades after exposure to heat and moisture. In this study, the impact damper system incorporating acoustic blackhole structure is used to implement similar damping performance. The reflection coefficient for the proposed structure was evaluated by experimentation on the beam structure...
순환정상성을 이용한 캐비테이션 초생 속도 분석기법 연구
Study on Cavitation Inception Speed Analysis Methods using Cyclo-stationarity
이 희 창 · 김 성 용 · 한 민 수 · 김 태 형 · 문 영 선
Hee-Chang Lee, Seong-Yong Kim, Minsu Han, Tae Hyeong Kim and Youngsun Moon
Cavitation inception speed (CIS) is a key factor of the acoustic stealth performance of naval ships because the level of underwater radiated noise begins to increase significantly after cavitation inception. Moreover, the acoustic feature could be provided to the enemy. The CIS is currently measured and managed by a strict naval procedure...
냉장고 기계실의 고주파 소음 특성 분석을 통한 음질 개선
Sound Quality Improvement of Refrigerator using the Analysis of High Frequency Noise Radiated from Compressor in the Machine Room
장 준 영 · 김 태 훈 · 탁 언 수 · 정 의 봉 · 안 세 진
Jun-Young Jang, Tae-Hoon Kim, Un-Su Tark, Weui-Bong Jeong and Se-Jin Ahn
This paper provides an analysis of the characteristics of the noise of components that affect the sound quality of oil-less refrigerators and suggests ways to effectively improve the sound quality. As the sound quality of refrigerators is determined by the characteristics of the various components and the path through which the noise is transferred, it is necessary to first analyze the characteristics of the noise generated by the components...
기존공동주택의 발코니 배수소음 저감용 드레인 덮개 시제품 적용 연구
Study on the Drain Cover Prototype Application for Balcony Drainage Noise Reduction of Existing Apartment House
송 민 정 · 강 민 우 · 오 양 기
Min-Jeong Song, Min-Woo Kang and Yang-Ki Oh
Balcony drainage noise in existing apartments is one of the facility noises subject to civil petition, next to the floor impact sound for residents. Newly constructed apartment houses have separate discharge systems for rainwater and drainage, thus, the drainage sounds of upper house are blocked by the lower house. However, as the structure of balcony drainpipes of apartments built before 2006 incorporate rainwater and drainage, residents are continuously complaining about the balcony drainage sounds...
COPYRIGHT 2018 ⓒ KSNVE ALL RIGHTS RESERVED.
The Korean Society for Noise and Vibration Engineering
#1406 Renaissance Officetel, 69, Seochojungang-ro, Seocho-gu, Seoul, 06651, Rep. of KOREA
Phone : 82-2-3474-8002~3, Fax : 82-2-3474-8004 / http://www.ksnve.or.kr / E-mail : ksnve@ksnve.or.kr
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