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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Transactions of the Korean Society for Noise and Vibration Engineering
Journal Basic Information
Journal DOI :
The Korean Society for Noise and Vibration Engineering
Editor in Chief :
Volume & Issues
Volume 24, Issue 12 - Dec 2014
Volume 24, Issue 11 - Nov 2014
Volume 24, Issue 10 - Oct 2014
Volume 24, Issue 9 - Sep 2014
Volume 24, Issue 8 - Aug 2014
Volume 24, Issue 7 - Jul 2014
Volume 24, Issue 6 - Jun 2014
Volume 24, Issue 5 - May 2014
Volume 24, Issue 4 - Apr 2014
Volume 24, Issue 3 - Mar 2014
Volume 24, Issue 2 - Feb 2014
Volume 24, Issue 1 - Jan 2014
Selecting the target year
Development of Acoustic Emission(AE) Sensor for Prognosis Detection of Bearing Fault
Lee, Chibum ; Kim, Gyeongwoo ; Park, Yeong-Il ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 6, 2014, Pages 429~436
DOI : 10.5050/KSNVE.2014.24.6.429
Most mechanical systems are now operating consistently and getting faster due to the development of automation systems. Peoples' dependence on machines have increased as when problems occur within the mechanical system, personal injury and production loss may come as a result, as most of the mechanical system's malfunctions are caused by the failure of the rotational bearing. What we need now is a maintenance system that can warn us when it detects abnormal conditions before significant damage occurs to the bearing. In this study, we have developed an acoustic emissions sensor that can figure if the bearing works under the normal condition. With this acoustic emissions sensor, we can inspect the bearing for defects by using the Heterodyne technique, which converts the ultrasound signal into audio, as a signal conditioning process.
Comparison of Fatigue Damage of Linear Elastic System with Respect to Vibration Input Conditions
Heo, Yun Seok ; Kim, Chan-Jung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 6, 2014, Pages 437~443
DOI : 10.5050/KSNVE.2014.24.6.437
Vibration testing is conducted for evaluate the fatigue resistance of responsible system over excitation situations and two kinds of vibration profiles, harmonic or random, are widely used in engineering fields. Harmonic excitation profile is adequate for the rotating machinery that is primarily exposed to the orderly excited force subjected for a rotating speed; Random profile is suitable for the non-stationary vibration input, that is a ground excitation for example. Recently, the sine on random(SOR) testing method was sometimes considered to represent the real excitation conditions since the measured response signals of a target system, expecially for moving mobility, shows usually a mixture of them. So, it is important to understand the accumulated fatigue damage over different excitation patterns, harmonic and/or random, to determine the efficient vibration profile of a target system. A uniaxial vibration testing with a notched simple beam was introduced to evaluate the fatigue damage for different excitation profiles and the best choice of vibration profile was concluded from those comparison of calculated fatigue damages.
Experimental Study and Evaluation Method for Sloshing Noise of Fuel Tank on Passenger Vehicle
Ahn, Sejin ; Yoon, Seongho ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 6, 2014, Pages 444~451
DOI : 10.5050/KSNVE.2014.24.6.444
The signal patterns of slosh noise produced by the fuel tank of a passenger vehicle are characterized by analyzing vehicle interior noise, fuel tank vibration, and near-field noise radiated from the fuel tank. This paper also shows the noise transfer path analysis results performed from the fuel tank to the vehicle inside. On top of them, physical index is described, demonstrating a good correlation with subjective feeling of slosh noise. It is essential to identify the main noise transfer paths for redesigning of the fuel tank system aiming at reducing slosh noise and also helpful to apply physical index in evaluating and reducing this noise. It is found that structure-borne path is the main root of slosh noise and a value reveals a good correlation with subjective feeling.
Study of Two Stroke Low Speed Diesel Engine Crankshaft Crack Phenomenon by Torsional Vibration Calculation & Measurement
Moon, Joung-Ha ; Kim, Jeong-Ryul ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 6, 2014, Pages 452~461
DOI : 10.5050/KSNVE.2014.24.6.452
Two stroke low speed diesel engines that have many advantages such as high thermal efficiency and durability have been widely used for marine engine. However, it is also true that many problems have occurred due to the high explosion pressure and severe operating environment. Especially problems of shaft damage etc. intensively occurred due to the phenomenon of crankshaft exceeding the allowable stress, including the shaft vibration of the engine model in the early stage. In this study, the crankshaft fracture phenomenon of early engine model was evaluated and analyzed by using up-to-date torsional vibration calculation program and measurement instrument. And this was numerically shown.
Analysis of Dynamics Characteristics of Water Injection Pump through the 2D Finite Element
Lee, Jong-Myeong ; Kim, Yong-Hwi ; Kim, Jun-Ho ; Choi, Hyeon-Cheol ; Choi, Byeong Keun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 6, 2014, Pages 462~469
DOI : 10.5050/KSNVE.2014.24.6.462
After drilling operations at the offshore plant, crude oil is producted under high pressure. After that time, oil recovery is reduced, because the pressure of the pipe inside is low during the secondary produce. At that time injection sea water at the pipe inside through water injection pump that the device increase to recovery. A variety of mathematical analysis during the detailed design analysis was not made through the dynamics characteristic at the domestic company. 2D model has reliability of analysis results for the uncomplicated model. Also element and the node the number of significantly less than in the 3D model. So, the temporal part is very effective. In addition, depending on the quality of mesh 3D is a real model and FEM model occurs error. So, user needs a lot of skill. In this paper, a 2D finite element analysis was performed through the dynamics analysis and the study model was validated.
A Research for the Development of the Transmission Error Measuring System and Transmission Error Specification for the Gear Noise Quality
Lee, Sang Hwa ; Lee, Hyun Ku ; Kang, Seok Chan ; Kim, Si Yoong ; Yoo, Dong Kyu ; Won, Kwang Min ; Chae, Geum Muk ; Lee, Tae Hwi ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 6, 2014, Pages 470~475
DOI : 10.5050/KSNVE.2014.24.6.470
In the past, transmission error(T.E.) has been identified as one of the main sources of gear whine noise, which cause serious passengers irritation at high frequency. In this study, to identify the correlation of the T.E. and gear whine noise, a T.E. measuring system was developed. By comparing the T.E. and gear whine noise level, T.E. target value which can represent the gear noise was proposed. The conclusions are followed: (I) It is possible to measure T.E. of the gear pairs (II) Similar trends are observed between T.E. and gear whine noise. (III) By observing the T.E. pattern, presence of sideband noise can be predicted. (IV) Proposed T.E. target value can be adopted to the gear manufacturing for gear noise quality management.
A Study on the Measurement of the Pipeline Displacement Vibration Using Accelerometers
Suh, Jin Sung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 6, 2014, Pages 476~482
DOI : 10.5050/KSNVE.2014.24.6.476
The stress analysis of the pipeline is required in any kind of plant for its safe operation. For this, the displacement vibration data measured at many locations of the pipeline should be provided. In reality, the installation of the non-contact type displacement sensors such as laser displacement sensors or eddy current type proximity sensors in a narrow and confined region in the vicinity of the pipeline is almost impracticable. In this work, the general purpose piezo-ceramic accelerometers were attached on the measuring points on the pipeline and the acceleration vibration signal was acquired. The measured acceleration signal was low pass filtered and then downsampled. The resulting acceleration signal was transformed into both the time-domain and frequency-domain displacement signal utilizing the fast Fourier transform techniques. All the procedures are presented in detail. It is demonstrated that the measurement of the pipeline acceleration by using contact type accelerometers can be made for the purpose of providing the required displacement data for the stress analysis of the pipeline.
Prediction of Concrete Slab Acceleration and Floor Impact Noise Using Frequency Response Function
Mun, Dae-Ho ; Park, Hong-Gun ; Hwang, Jae-Seung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 24, issue 6, 2014, Pages 483~492
DOI : 10.5050/KSNVE.2014.24.6.483
Uncomfortable feelings of occupants by indoor floor impact noise in a residential building are not accurately represented by the floor impact noise from a standard impact source. It is due to the characteristics of standard impact sources, which are different from the impact forces produced by occupants. It varies significantly by impact source, and it is not easy to be replicated for testing. As a result, the indoor floor impact noise under different acoustic conditions cannot be directly compared. Using frequency response function(FRF), which represents the input-output relationships of a dynamic system, it is possible to examine the characteristics of the system. Especially, FRF can predict the response of a linear dynamic system subjected to various excitation. To determine the relationship between impact force and the corresponding response of dynamic system in residential building, the acceleration response of a concrete slab and the floor impact noise in the living room, produced by bang-machine and rubber-ball excitation, were measured. The test results are compared to the estimates based on FRF and impact force spectrum.