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사단법인한국소음진동공학회 The Korean Society for Noise and Vibration Engineering

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저널레터 : Trans. Korean Soc. Noise Vib. Eng., Vol. 29, No. 3

한국소음진동공학회

2019-06-21

첨부파일

한국소음진동공학회_발행논문 서지정보(20190620).xlsx

2019년 06월 제 29권 제 3호 통권 248호


철도 브레이크 스퀼 소음 해석 연구
Numerical Investigation on Rail Brake Squeal
신희혁 · 남재현 · 최성진 · 강재영 Heehyuk Shin, Jaehyeon Nam, Sungjin Choi and Jaeyoung Kang
In this study, the brake squeal of rail or subway brakes is investigated using the numerical finite element method. A complex eigenvalue analysis is applied to determine the squeal modes of the train brake. Because the geometry of the rail brake pad is relatively large, numerous natural modes of the pad exist, leading to its instability....


진동 절연을 위한 KDamper 모델링
Modeling of KDamper for Vibration Isolation
안진수 · 이찬규 · 송오섭 Jin-Soo Ahn, Chan-Kyu Lee and Ohseop Song
The KDamper is a new passive vibration isolation and damping concept based on the incorporation of negative stiffness elements. In this study, a mathematical model of the KDamper system is established and an analysis on the vibration isolation performance of a KDamper system is performed considering the effect of nonlinear negative stiffness. ...


수중폭발 직접충격파에 의한 FRP 음향창의 구조안전성 분석
Structural Safety Analysis of FRP Type Sonar Window Due to Direct Shock Wave of Underwater Explosion
김완호 · 정병규 · 강명환 · 서영수 · 김소윤 Wan-Ho Kim, Byung-Kyoo Jung, Myung-Hwan Kang, Young-Soo Seo and So-Yoon Kim
This paper describes an experimental and analytical analysis on structural safety owing to direct shock waves generated by an underwater explosion in an FRP-type acoustic window of a surface ship. First, an underwater explosion test in a cylindrical water tank was conducted to determine the impact response. In order to set the underwater shock test conditions ruled by MIL-S-901D, this...


초음파 펄스-에코 측정을 통한 열화 시편의 음향 비선형 특성 평가
Evaluation of Acoustic Nonlinearity of Heat-treated Specimens by Using Ultrasonic Pulse-echo Measurements
조성종 · 정형 · 신효정 · 주영상 Sungjong Cho, Hyunjo Jeong, Hyojeong Shin and Young Sang Joo
An experimental study was conducted to accurately measure the absolute nonlinear parameter (β) of damaged solid samples in a pulse-echo setup; the results are presented in this paper. Artificially aged Al 6061 specimens were used as the damaged specimens. To improve the amplitude of the second harmonic wave received in the pulse-echo mode with a stress-free boundary to a measurable level, we developed a dual element transducer in which the transmitter and receiver were separated. .....


차량용 파워 시트 슬라이드 장치 음질의 감성 평가
Sensory Evaluation of Sound Quality for Vehicle Power Seat Slide Adjuster
김성육 · 오종석 · 김기 Sung-Yuk Kim, Jong-Seok Oh and Key-Sun Kim
In this study, we analyzed the image characteristics of vehicle type and the operating sound quality by jury testing the operating noise of the power seat slide adjuster for the vehicle. First, the operating noise for five test power seats was measured and adjectives for subjective sound quality evaluation were extracted through questionnaires. Next, the images according to vehicle type were examined using the extracted adjectives. ...


물리적 좌표기반 구조 변위해석 유한요소 코드 및 PARDISO, PCG, GMRES와 MATLAB 또는 OCTAVE 연산자 ‘＼’ 를 포함하는 여러 고성능 계산기법 개발
Development of Structural Displacement Finite Element Codes Based on Physical Coordinates and High Performance Computing Methods Including PARDISO, PCG, GMRES and MATLAB or OCTAVE Intrinsic Operator ‘＼’
박석태 Seok-Tae Park
This paper presents physical coordinate-based 3-node triangular, 4-node rectangular, and 4-node quadrilateral FE codes on the Kirchhoff thin plate theory. Isoparametric 4-node quadrilateral and 4-node plate shell FE codes based on natural coordinates are also presented. The calculation time needed to solve a system equation was compared using direct, iterative, and full matrix and sparse matrix solvers including Gauss elimination method, CG, DGESV, DSGESV, SOR, PCG, GMRES, FGMRES, MGMRES, PARDISO, etc....


가속내구에 의한 자동차 내외장재 마찰소음 실험연구 고찰
An Experimental Study on the Friction Noise of Interior and External Automotive Materials by Endurance Test
배상규 · 김기선 · 강재영 Sang-Kyu Bae, Key-Sun Kim and Jaeyoung Kang
In this study, we investigated the noise characteristics using the friction curve of an ABS material where surface changes occurred owing to continuous friction using a friction test apparatus. To artificially generate instability, the acceleration and the friction coefficient were measured after 90000cycles rubbing at a normal force of 40N and a velocity of 80mm/s.r...


CPU와 GPU를 이용한 혼성 방법을 이용한 고속 직접 경계 요소법 개발
Development of High Performance Computing Codes in Direct Boundary Element Method Using Hybrid Method Combined with CPU and GPU
박석태 Seok-Tae Park
Various techniques have been proposed to shorten the analysis time of the traditional acoustic direct boundary element method. The overall analysis time can be reduced by vector operations and parallel operations. When constructing the system equation, unnecessary repetitions were reduced and modified separately to increase the analysis speed. To solve the system equations, computation speeds for each case to run on a CPU were compared using LINPACK-, LAPACK-, and MKL-dedicated libraries.....


수소전기차용 공기압축기의 NVH 특성 규명
Identification of NVH Characteristics of Air Compressor for Fuel Cell Electric Vehicles
김태호 · 문창국 · 황성호 · 이종성 · 박건웅 · 양현섭 · 하경구 · 이창하 Tae Ho Kim, Chang Gook Moon, Sung Ho Hwang, Jongsung Lee, Gun Woong Park, Hyun Sup Yang, Kyoung-Ku Ha and Chang Ha Lee
This paper evaluates the NVH characteristics of an air compressor for fuel cell electric vehicles (FCEVs) by conducting experimental as well as on-road tests. For the experiment, five eddy-current-type displacement sensors measured the vibration amplitudes of the shaft at the impeller and thrust runner ends, one three-axis accelerometer measured the acceleration of the compressor....


초음파 센서의 혼 가이드 치수에 따른 음향 지향성
Acoustic Directivity of an Ultrasonic Sensor Depending on Horn Guide Dimension
임성구 · 김진오 Sung Gu Lim and Jin Oh Kim
This study investigates the ultrasonic transmission and reception characteristics of an ultrasonic sensor combined with a horn guide to improve its acoustic directivity. Because an ultrasonic sensor with better directivity can measure longer distances, the purpose of this study is to determine the length and angle in the design of a horn guide to be combined with an ultrasonic sensor, which provides the best transmission and reception directivity...


허니컴 샌드위치 패널 인서트의 충격파 전달 특성에 관한 실험 및 해석적 연구
Experimental and Analytical Study on Shock Wave Transfer Characteristic of Honeycomb Sandwich Panel Insert
박현수 · 황대현 · 한재흥 Hyun-Su Park, Dae-Hyun Hwang and Jae-Hung Han
Severe pyroshock can cause failure of mounted electronic equipment used in various space missions. To prevent this problem, it is important to predict the propagation path and attenuation of shock in space structures. In the case of a honeycomb sandwich panel, which is widely used in satellites, an insert is used in essential to connect with other structures and the shock wave propagates through this insert system....


공기소음 및 고체소음 측정불확도 추정
Estimation of Measurement Uncertainty in Airborne Noise and Structureborne Noise
박성호 Sungho Park
This paper analyzes the results of the estimated uncertainties of air-borne noise and structure-borne noise. The test results include the measurement uncertainties, which are used for validation. A mathematical model with various measurement uncertainty factors is required to provide more accurate test results. The contribution of each element to the measurement uncertainty was analyzed and the characteristics of the measurement uncertainty with frequency variation were investigated.


하이브리드 파워흐름해석법을 이용한 동일 평면상에서 연성된 평판의 횡진동 해석 연구
An Investigation on the Flexural Vibration of Coupled Co-planar Plates by Using Hybrid Power Flow Analysis
강현영 · 유정수 · 김기선 Hyunyoung Kang, Jungsoo Ryue and Ki-Sun Kim
The finite element method (FEM) and the statistical energy analysis (SEA) are widely used in the numerical analyses of structural vibrations. However, these two methods are limited in that they cannot be applied at high frequencies. In order to overcome this problem, an alternative approach, called energy finite element analysis (EFEA) has been proposed, which is based on power flow analysis (PFA)....


탄성경계조건을 가지는 회전하는 보의 자유진동 해석
Free Vibration Analysis for a Rotating Beam with an Elastic Boundary Condition
이정우 · 유충준 · 이정윤 Jung Woo Lee, Chung Jun You and Jung Youn Lee
his paper presents a transfer matrix method to accurately determine the natural frequencies and mode shapes of the free vibration characteristics of a rotating Bernoulli–Euler beam with an elastic boundary condition (EBC) at its root. The proposed method can accurately determine the desired number of natural frequencies for such problems using a single element....


전기 자동차용 인휠 모터 시스템의 소음 저감
Noise Reduction of an In-wheel Motor System for an Electric Vehicle
김보형 · 홍준기 · 윤신 · 신경호 · 민경휘 · 정진태 Bohyeong Kim, Jungi Hong, Seen Yun, Gyoungho Shin, Gyeongwhi Min and Jintai Chung
In this study, we identified the noise sources of an in-wheel motor system and proposed a low-noise design guideline through structural modification. To identify the noise sources, we not only measured the noise and vibration signals, but we also performed modal testing. Using waterfall plots for the....


지향성을 고려한 야외공연장 옥외전달소음 예측식 비교·분석
Comparison and Analysis on the Prediction Equations of Transmission Noise Considering the Sound Directivity in Playing at the Outdoor Performance Hall
김흥식 · 조순형 Heung-Sik Kim and Soon-Hyeong Jo
This study provides an appropriate estimation equation for outdoor transmission noise while manufacturing noise maps or predicting the noise of surrounding regions during a performance at an outdoor performance hall. By utilizing a commercially available program Cadna-A, values predicted using three equations, ISO-9613, VDI-2714, and CONCAWE, are compared with...

The Korean Society for Noise and Vibration Engineering
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