사단법인한국소음진동공학회 The Korean Society for Noise and Vibration Engineering

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저널레터 : Trans. Korean Soc. Noise Vib. Eng., Vol. 29, No. 6 한국소음진동공학회 2019-12-26
첨부파일
2019년 12월 제 29권 제 6호 통권 251호
타겟면의 거칠기 및 경사각에 따른 초음파 반사 특성 실험
Experiments Characterizing Ultrasound Reflection at a Target Surface Depending on Roughness and Slope
임 성 구 · 김 진 오
Sung Gu Lim and Jin Oh Kim
This study deals with ultrasound reflection characteristics at a target surface during distance measurements using an ultrasonic sensor. The purpose of this study is to investigate the allowable range of the slope angle of a target surface where the incident ultrasound is reflected to return when the distance is measured by an ultrasonic sensor for both transmission and reception. To this end, it is necessary to research ...
프로펠러 가진에 의한 저속 디젤엔진을 갖는 추진축계의 종진동
Axial Vibration of Propulsion Shafting System with Low Speed Diesel Engine by Propeller Excitation
송 명 호 · 이 돈 출
Myeongho Song and Donchool Lee
The axial vibration of propeller-induced excitation can be mostly seen in warships that have high-speed rotation propulsion shafting systems equipped with reduction gears. Coupled torsional and axial vibration is mainly focused on the excitation force that is ...
G/T 500톤급 차도선 추진축계시스템의 비틀림진동 특성과 안전성 평가
Torsional Vibration Characteristics and Safety Estimation of Propulsion Shafting System on the G/T 500 ton Class Passenger and Car-ferry Vessel
송 명 호
Myeongho Song
In South Korea, which is surrounded by the sea on three sides, many passenger and car ferries operate around the coasts where there are many islands. Until recently, passenger and car ferries of the 200 gross tonnage (G/T) class were mainly built by small shipbuilding companies. In recent years, with the improvement of the berth facilities of islands, passenger and car ferries of the 500 G/T class have been built and operated to improve economic and operational efficiency. The propulsion shafting system applied to these ships requires ...
주거공간 공기전달음의 저주파 대역 음압레벨의 최소 인지 차이
Just Noticeable Difference of SPL in Low-frequency Range for Airborne Sounds in Residential Space
이 송 미 · 김 정 훈 · 송 한 솔 · 류 종 관 · 김 경 호
Songmi Lee, Jeonghun Kim, Hansol Song, Jongkwan Ryu and Kyungho Kim
This study investigated the just noticeable difference (JND) of sound pressure levels (SPL) in low-frequency ranges for airborne sounds in residential spaces through an auditory experiment. Test sound consisted of TV news, piano, and music (metal genre) filtered by the sound transmission loss of a 200 mm concrete wall. The SPL in the...
선체진동 신호로부터 정의된 선체의 수중방사소음을 이용한 프로펠러 캐비테이션 소음 예측 연구

Study for Estimation of Propeller Cavitation Sound using Underwater Radiated Sound from the Hull Estimating with Hull Vibration
한 형 석 · 전 수 홍 · 이 청 원 · 김 용 훈
Hyungsuk Han, Soohong Jeon, Chungwon Lee and Yonghoon Kim
In order to estimate the underwater radiated noise of a ship, the underwater radiated sound from the hull as well as the propeller cavitation should first be defined. However, the propeller cavitation sound is not defined yet but the approximated value is used in the design state of the ship. In this research, the propeller sound including external flow-induced noise is defined. The underwater radiated ...
바닥충격음 및 배수음에 대한 인공음과 자연음의 마스킹효과 조사
Investigation on Masking Effect of Artificial and Natural Sounds on Floor Impact and Drainage Noises
김 정 훈 · 송 한 솔 · 이 송 미 · 박 한 솔 · 이 우 영 · 조 성 근 · 류 종 관
Jeonghun Kim, Hansol Song, Songmi Lee, Hansol Park, Wooyoung Lee, Sungkuen Cho and Jongkwan Ryu
This study investigated the effect of artificial and natural sounds on the masking of residential noises through auditory experiments. Residential noises consisted of floor impact noise (children jumping) and toilet flushing noise. As masking sounds, white, pink, and brown noises were used for artificial sounds and waterfall, stream, wave, rain-fall, insect, and bird sounds were included as natural sounds. In the auditory experiment, thirty subjects rated their masking sound preferences and annoyance (7 point verbal scale) for residential noises and residential noises mixed...
달팽이관 필터뱅크 및 ZCPA 청각모델에 기반한 두 귀의 시간차 추정기법
Estimation of Interaural Time Difference based on Cochlear Filter Bank and ZCPA Auditory Model
이 경 태 · 박 용 화
Gyeong-Tae Lee and Yong-Hwa Park
This study presents a method for estimating interaural time difference (ITD) by modeling the human auditory system. The proposed model simulated the response of the human inner ear by signal processing. The response of the cochlea consists of the mechanical vibration of the basilar membrane and the neural transduction of the inner hair cells. The traveling waves on the basilar membrane were ...
지진하중 하에서 로킹모드에 의한 캐비닛의 응답특성 분석
Evaluate the Characteristics of Vibration Caused by Rocking Modes of Electric Cabinet under Seismic Loading
임 승 현 · 전 법 규 · 장 성 진 · 최 인 길
Seung-Hyun Eem, Bub-Gyu Jeon, Sung-Jin Jang and In-Kil Choi
Safety-related electrical cabinets that are installed in nuclear power plants require seismic performance evaluation. The seismic performance evaluation for these cabinets is conducted by shaking table tests or numerical analyses. These methods usually assume that the electrical cabinets are rigidly anchored to the floor or foundation when performing the seismic evaluation by the numerical simulation. However, this assumption ...
단독경보형감지기 발생음 패턴에 따른 음향 특성 연구
Acoustical Characteristics of the Single Alarm Detector in Terms of Sound Pattern
백 은 선 · 박 현 구
Eun-Sun Baek and Hyeon-Ku Park
The household smoke alarm is a warning device used to minimize damage in case of fire in a house or business. There are many types of fire detectors, but smoke alarms are known to be the most efficient. This study was conducted to analyze the acoustic characteristics of household smoke alarms. Thirteen domestic and overseas products were measured to...
지진에 의한 배전반 설치 앵커부의 하중특성에 대한 해석적 연구
Analytical Study on the Loading Characteristics of the Distribution Panel Installed Anchorage under the Seismic
이 상 문 · 정 우 영
Sang-Moon Lee and Woo-Young Jung
The main purpose of this study is to assess the safety of the fixed earthquake anchorages for the distribution panel of facilities in an actual power plant. Experimental and analytical studies were conducted to investigate the load response that occurs on the anchorages in the event of an actual earthquake. Shaking table experiments of the panels were first conducted and the boundary conditions of different joint connections ...
수소전기차용 공기압축기 에어포일 스러스트 베어링 2-FSI 해석
2-FSI Analysis of an Air Foil Thrust Bearing of Air Compressor for a Hydrogen Electric Car
신 현 장 · 박 건 웅
Hyun Jang Shin and Gun Woong Park
A hydrogen-electric car is a fuel-cell vehicle that reacts hydrogen fuel with oxygen in the air to generate electricity to drive the traction motor. An air compressor is a device that compresses air and supplies it to the fuel cell stack. These generally use two types of airfoil bearings: The first is journal bearing, the second a thrust bearing. In this paper, axial thrust bearings are...
진동대 시험을 이용한 수력발전소 RTU 패널의 내진성능평가
Seismic Performance Evaluation for Hydroelectric Power Plants RTU Panel by Shaking Table Tests
전 법 규 · 윤 다 운 · 신 용 재 · 정 우 영
Bub-Gyu Jeon, Da-Woon Yun, Yong-Jae Shin and Woo-Young Jung
In Korea, many facilities were damaged due to the Gyeongju and Pohang earthquakes in 2016 and 2017, respectively. In recent years, earthquakes have caused more damage to non-structural components than to structures. Among these non-structural components, electrical panels are one of the most important devices used to maintain the function of their facility. Thus, damage to equipment ...
전술급 무인기 프로펠러의 형상변화에 따른 소음 수준 특성
Sound Levels from Variable Shapes of a Tactical UAV Propeller Room
유 기 완
Ki-Wahn Ryu
Sound levels from the propeller of a tactical unmanned aerial vehicle (UAV) were computed using an acoustic analogy. The potential based panel method was used to obtain the pressure distribution on the blade surface. The blade geometry, pressure distribution on the blade surface, and operating conditions were used as input data for the thickness ...
2행정 저속 디젤 엔진용 종진동 댐퍼의 모델링 방법
Axial Vibration Damper Modelling Method on the Two Stroke Low Speed Diesel Engine
송 명 호 · 이 돈 출
Myeongho Song and Donchool Lee
The axial vibration of the crankshaft was first introduced in 1940 and related studies were conducted in the 1960s. An axial vibration countermeasure of a de-tuner, similar to a thrust bearing, was applied at an early stage. After the first and second oil shocks in the 1970s, MAN Energy Solutions developed the fuel-saving long-stroke MC engine and they began to apply the axial vibration damper (AVD) in earnest. Around that time, WinGD also developed ...
압전 초음파 진동자를 이용한 차량엔진 월웨팅 저감 성능 고찰
Performance Investigation of Wall-Wetting Reduction in Vehicle Engines Utilizing Piezoelectric Ultrasonic Vibrator
한 영 민
Young-Min Han
This study proposes a droplet dispersion technology utilizing ultrasonic waves to reduce the wall-wetting phenomenon of the injected fuel droplets inside an engine, which can reduce the exhaust gas of vehicles. To achieve this goal, the wall-wetting reduction device was designed to generate ultrasonic waves utilizing a piezoelectric vibrator. The design parameters of the proposed piezoelectric vibrator were ...
바닥충격음 표준 중량 충격원과 평가지표 간의 대응관계
Correspondence Between Standard Heavy Impact Sources and Single Number Indexes of Floor Impact Sound
김 경 우 · 신 혜 경
Kyoung-woo Kim and Hye-kyung Shin
A bang machine and a rubber ball can be used as a heavy impact source. Rubber ball sources have recently been included in International and Korean Standards. Heavy impact sound evaluation indexes are used for the inverse-A characteristic curve, arithmetic mean, A-weighted impact sound pressure levels, and the L index. To improve the utilization of the measurement results of the two heavy impact sources, we looked ...
유리의 단면구성과 미서기 창호 창틀이 창의 차음성능에 미치는 영향
Effect on Sound Insulation Performance of Double Sliding Window According to Glass Sectional Structures and Window Frame
양 관 섭 · 신 혜 경 · 김 경 우
Kwan-seop Yang, Hye-kyung Shin and Kyoung-woo Kim
In general, indoor noise due to external noise such as automobiles and airplanes is determined by the sound insulation performance of the window. However, windows do not only provide sound insulation from external noise but also perform various functions such as providing views, ventilation, insulation, and airtightness. Among these functions, the national insulation standards, including windows, have been strengthened to achieve greenhouse gas reduction for the building sector. Therefore, the cross-sectional structure of glass ...
철도소음 측정망에 대한 적정한 소음측정방법의 비교 연구
A Comparative Study on the Noise Measurement Methods for Proper Monitoring of Railway Network Noise
이 창 혁 · 노 유 진 · 김 인 규 · 이 병 찬
Chang Hyeok Lee, Yu Jin Noh, In Kyu Kim and Byung Chan Lee
The railway noise measurement network shows the noise around the railway area by one manual measurement every half year. This method suffers with limitations in determining the railway noise levels. To obtain more reliable measurement data and to obtain basic data for noise reduction procedures, the railway noise was measured for one year at six railway stations in three cities, using a portable ...
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The Korean Society for Noise and Vibration Engineering
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