사단법인한국소음진동공학회 The Korean Society for Noise and Vibration Engineering

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저널레터 : Trans. Korean Soc. Noise Vib. Eng., Vol. 29, No. 4 한국소음진동공학회 2019-08-20
첨부파일
2019년 08월 제 29권 제 4호 통권 249호
토크 변동조건에서의 유성기어세트 동적 거동 해석 모델링에 대한 연구
Research for the Modeling of the Dynamic Analysis for the Planetary Gear Sets under the Torque Fluctuation
이현구 · 김무석 · 홍사만 · 유동규 · 아멧칼만 · 데이빗탈봇
Hyun Ku Lee, Moo Suk Kim, Sa Man Hong, Dong Kyu Yoo, Ahmet Kahraman and David Talbot
In this paper, to reduce planetary gear noise under the neutral control condition, a dynamic analysis model for multi-stage planetary gear trains of the HMC 6th speed automatic transmissions under a torque fluctuations condition is proposed. The natural frequencies of its system are computed by solving the corresponding eigenvalue problem. Moreover, some forced torque fluctuation response to the planetary gear system is applied to check its influence during neutral control. By undertaking some....
초전도 EDS 시스템 캡슐열차의 동특성 연구
Study on Dynamic Characteristics of Superconducting Capsule Train
윤란희 · 유원희 · 이진호 · 이창영 · 이관섭
Ranhee Yoon, Wonhee You, Jinho Lee, Changyoung Lee and Kwansup Lee
The capsule train is a subsonic high-speed transportation system adopting electrodynamic suspension using a superconducting magnet. As the capsule train travels in a levitated state by using magnetic levitation force at a certain speed, the dynamic characteristics under those conditions must be considered. In this study, the running dynamic characteristics of ...
동적하중을 받는 항공기 외부장착물의 피로수명 예측에 대한 연구
Study on Fatigue Life Estimation of an Aircraft External Store under Dynamic Loads
정회인 · 박지환 · 손동훈 · 장종윤
Hoein Jeong, Jihwan Park, Donghun Son and Jongyoun Jang
In this article, we evaluate the fatigue life of an aircraft external store under real dynamic loads of a helicopter. For estimation of fatigue life of an aircraft external store, we first measured the vibration after mounting an aircraft external store on the actual helicopter and analyzed the PSD. Then, the PSD for accelerated life test was calculated using VRS and time scaling....
스톡브릿지 댐퍼를 장착한 송전선의 진동해석
Vibration Analysis of Transmission Line with Stockbridge Dampers
구재량 · 송오섭
Jae-Raeyang Koo and Oh-Seop Song
This paper discusses the dynamic modeling and vibration analysis of transmission lines with Stockbridge dampers. Stockbridge dampers are attached to transmission lines to reduce the vibration amplitude of the transmission line, thus avoiding the risk of fatigue on the line. To build a dynamic model, the kinetic and potential energies of a transmission line with Stockbridge dampers were derived using the assumed mode method and Lagrange’s equation. The equations of motion are expressed in matrix form...
바닥충격음 연구현황 및 전망

Review and Perspective on the Researches of Floor Impact Sound
정정호
JeongHo Jeong
Since the last 30 years, there have been various studies conducted on different topics related to floor impact sound. In this study, the papers and proceedings presented at KSNVE (The Korean Society for Noise and Vibration Engineering) for the past 30 years are sorted as per the topics, and the results were analyzed. The main subjects of these floor impact sound papers were floor impact sound isolation system, including the resilient materials, and papers on measurement and evaluation methods and prediction. Research on...
스프링 요소를 이용한 멀티와이어쏘 장비의 베어링 배치 설계에 관한 연구
Study on the Bearing Arrangement of Multi-wire Saw Equipment Using Spring Elements
박혜량 · 이준영 · 임홍재 · 정재일
Hye Ryang Park, Jun Young Lee, Hong Jae Yim and Jay Il Jeong
In this paper, bearing arrangements for multi-wire saw were studied with the aim of reducing time and material loss in the after-treatment process. Due to the displacement of the spindle during the cutting process, the workpieces are curved. To improve the stiffness of the spindle, a bearing arrangement was performed. Because the mass of the spindle....
신호처리를 이용한 노크센서의 엔진진동 측정에 대한 연구
A Study on Engine Vibration Measurement of Knock Sensor Using Signal Processing
김용현 · 고대철
Young Hyun Kim and Dae Cheol Ko
To measure engine vibrations, an additional accelerometer must be installed. However, selecting the measurement position is difficult to and requires additional cost. In contrast, the knock sensor is a sensor that detects the knocking of the engine. It has a piezo resistor, which is inserted in the knock sensor, that can turn these vibrations into voltage. In this study, we measured...
유체-구조간 결합을 고려한 진동-음향 모델의 축소
Performance of Multiphysics Model Reduction of Vibro-acoustic Coupled Problem
김수민 · 채수원 · 박광춘 · 김진균
Soo Min Kim, Soo-Won Chae, K. C. Park and Jin-Gyun Kim
We introduce a strongly coupled model reduction method recently developed for well-known vibro-acoustic interaction, which is a standard (u, p) formulation. The key principle of the scheme is a sequential reduction process from the structure to fluid domains. The sequential projection allows for a strong connection between two different physical domains, unlike conventional schemes that...
타공형 석고보드 천장적용에 따른 중량충격음 저감 효과분석
Analysis Effects of Perforated Gypsum Board Ceiling Structure for Floor Impact Sound Reduction
신혜경 · 김경우
Hye Kyung Shin and Kyoung Woo Kim
As the number of old apartments increases, a method that reduces heavy weight floor impact sound during remodeling or repair work needs to be developed. Generally, apartment ceilings are constructed using gypsum boards with an air layer approximately 170 mm to 200 mm from the bottom slab. This air layer causes amplification of heavy impact sound in the 63 Hz ~ 125 Hz frequency band. In this study, to reduce ....
음향상사법을 이용한 멀티콥터형 소형무인기의 공력 소음 예측
Prediction of Aerodynamic Noise Radiated from a Small Multicopter Unmanned Aerial Vehicle using Acoustic Analogy
이학진 · 이덕주
Hakjin Lee and Duck-Joo Lee
The rotor interaction phenomenon occurs frequently in unmanned aerial vehicles (UAVs) with multi-rotor configuration. In this study, we investigated the rotor interaction effects of a small-size quadcopter UAV on the aerodynamic performance and acoustic characteristics. The numerical simulation of DJI Phantom 2 model in the hover flight condition was conducted using the nonlinear vortex lattice method (NVLM) with the vortex particle method (VPM) and acoustic analogy based on the Farassat-1A formula. NVLM can consider...
다구치방법과 전달행렬법을 이용하여 지반진동을 받는 감쇠전단구조물의 진동저감 연구
Study on Vibration Reduction of Shear Damping Structure Subjected to Ground Vibration Using the Taguchi Method and Transfer Matrix Method
조찬우 · 이정우 · 김동원 · 이정윤
Chan U Jo, Jung Woo Lee, Dong-Won Kim and Jung Youn Lee
Damped shear structures are widely used in industrial plant construction and building design but are often excited during ground vibrations. The study of vibration response of these structures is important for both accurate product production and building design. Traditionally, finite element methods such as ANSYS have been used as the main method for calculating the response of these structures. However, when interpreting shear structures, this method is not as efficient because the matrix is larger....
시간 영역 설계 사양을 위한 강인한 P2/LTR 제어
Robust P2/LTR Control for Time Domain Design Specification
서상민
SangMin Suh
Linear quadratic Gaussian/loop transfer recovery(LQG/LTR) is a robust control design method in the frequency domain. However, the method does not consider time-domain design specifications such as overshoots or vibrations. This paper proposes pole placement/loop transfer recovery(P2/LTR) to satisfy the time-domain design specifications that include frequency domain design specifications. The time-domain design...
에어컨 실내기 냉매 소음의 정량적 평가 인덱스 개발
Development of Refrigerant-induced Noise Quantitative Index for Air Conditioner Indoor Unit
정운창 · 오재응
Un-Chang Jeong and Jae-Eung Oh
In this study, the objective and subjective sound quality of refrigerant-induced noise from air conditioner indoor units are conducted, particularly on the noise of two-phase flow, which is the main refrigerant-induced noise in air conditioner indoor units. To this end, Zwicker’s parameters were determined for an objective evaluation of two-phase flow noise via signal processing. In addition, virtual sound sources...
가변형 Magneto-rheological Elastomer 동흡진기의 설계
Design of Variable Magnetic-rheological Elastomer-based Dynamic Vibration Absorber
정운창 · 오재응
Un-Chang Jeong and Jae-Eung Oh
Magnetic-rheological elastomer is a smart material that can change its shear modulus. This study suggested magneto-rheological elastomer (MRE)-based dynamic vibration absorber (DVA). The MRE-based DVA can change its stiffness instantly by controlling the magnetic field. To control the magnetic field, a magnetic flux generator was designed using electromagnetic finite element...
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