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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Transactions of the Korean Society for Noise and Vibration Engineering
Journal Basic Information
Journal DOI :
The Korean Society for Noise and Vibration Engineering
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Volume & Issues
Volume 22, Issue 12 - Dec 2012
Volume 22, Issue 11 - Nov 2012
Volume 22, Issue 10 - Oct 2012
Volume 22, Issue 9 - Sep 2012
Volume 22, Issue 8 - Aug 2012
Volume 22, Issue 7 - Jul 2012
Volume 22, Issue 6 - Jun 2012
Volume 22, Issue 5 - May 2012
Volume 22, Issue 4 - Apr 2012
Volume 22, Issue 3 - Mar 2012
Volume 22, Issue 2 - Feb 2012
Volume 22, Issue 1 - Jan 2012
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Sound Absorption and Thermal Insulation Characteristics of Membrane Used for Sound Field Control
Jeong, Jeong-Ho ; Kim, Jeong-Uk ; Jeong, Jae-Gun ; Cho, Byung-Wook ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 2, 2012, Pages 103~114
DOI : 10.5050/KSNVE.2012.22.2.103
Nowadays membrane material is widely used for large indoor spaces and long spaces such as traditional market. Thermal insulation and sound field control performance is considered as a main properties for design of such buildings. In this paper sound absorption and thermal insulation properties of membrane material was investigated. Firstly, normal incidence sound absorption coefficient of 10 kinds of glass wool textiles showed that sound absorption coefficient was increased in proportion of thickness and surface density of textile. Sound absorption coefficient of 4 kinds of sound absorptive inner membrane with outer membrane was tested in the reverberation chamber. Sound absorption coefficient of mid frequency range was about 0.4 ~ 0.6. Also, sound absorption coefficient was changed by the air space behind the membrane material. Secondly, sound field control performance was investigated using mock-up space. By the installation of sound absorption membrane material, reverberation time was decreased and speech intelligibility was increased. Finally, thermal resistance and room temperature in two kinds of mock-up rooms were tested, simultaneously. Results of thermal properties showed thermal insulation properties ware increased by adding inner membrane material underneath the outer membrane.
Study on the Design Process to minimize the Weight of the Damping Material
Kim, Ki-Chang ; Kwon, Jo-Seph ; Kim, Chan-Mook ; Kim, Jin-Taek ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 2, 2012, Pages 115~122
DOI : 10.5050/KSNVE.2012.22.2.115
Sound packages and damping materials have been widely applied on the floor to decrease the interior noise of a vehicle. Based on the previous researches on the low-noise vehicles, weight optimization through minimization of damping material usage is required while decreasing mid and high frequency range noise by application of sound packages. This paper describes the analysis process of robust design of vehicle body structure before applying damping materials and focuses on the analysis and test process of the location optimization at the stage of damping material application. A vibration experiment for the analysis of floor panel velocity with respect to the excitation of suspension attachment parts at the underfloor of a vehicle is performed. And through the improvement correlation between FEA and TEST, a design guide to optimize damping materials application in the early design stage is proposed. A research on vibration damping steel sheets and liquid acoustic spray on deadener(LASD) is performed to minimize manufacturing time and to minimize the space for pre-existing asphalt damping materials. As results of this study, panel stiffness is achieved through curved surface panel and bead optimization. And test baseline of optimum design is suggested through damping material optimization. And finally, through re-establishing the analysis process for vibration reduction of vehicle floors and lightweight design of damping materials, it is possible to design damping materials efficiently in the preceding stage of design.
Fatigue Damage Prediction Using Design Sensitivity Analysis
Kim, Chan-Jung ; Lee, Bong-Hyun ; Jeon, Hyun-Cheol ; Jo, Hyeon-Ho ; Kang, Yeon-June ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 2, 2012, Pages 123~129
DOI : 10.5050/KSNVE.2012.22.2.123
It was previously suggested the design sensitivity analysis based on transmissibility function to identify the most sensitive response location over a small design modification. On the other hand, energy isoclines were used to predict the fatigue damage with acceleration response only. Both of previous studies commonly tackle the engineering problem using the acceleration response alone such that it may be possible to investigate the relationship between sensitivity analysis and accumulated fatigue damage. In this paper, it is suggested the novel method of vibration fatigue prediction using design sensitivity analysis to enhance the accuracy of predicted accumulated fatigue. Uni-axial vibration testing is performed with a simple notched specimen and the prediction of fatigue damage is conducted using accelerations measured at different locations. It can be concluded that the accuracy of predicted fatigue damage is proportional to the sensitivity index of the responsible location.
Analysis of Residents' Consciousness for the Environmental Noise in the Residential Area
Park, Hyeon-Ku ; Song, Guk-Gon ; Kim, Won-Sik ; Kim, Sun-Woo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 2, 2012, Pages 130~138
DOI : 10.5050/KSNVE.2012.22.2.130
Environmental noise in the residential area is appeared with different types and features along with the growth of society. In particular when the economic level is raised up, the demand of residents for the environmental noise becomes more sensitive. The existing research on the environmental noise was initiated in the 1980's and resulted that the children's jumping sound was most annoying among the noises transmitted from the other unit. This result caused such activities that the researches were focused on the floor impact noise and that the laws in relation to environmental noise within residential area were revised strictly. This study aimed to survey the consciousness of residents for the environmental noise and to see how it is changed comparing with the previous one. Ultimately this result could be useful to establish the target for research or noise control to make the comfortable residential environment.
A Study on the Standard of Navy Vessel's Environmental Vibration for Improvement of the Habitability of Crew
Park, Mi-You ; Cho, Heung-Gi ; Han, Hyung-Suk ; Lee, Kyoung-Hyun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 2, 2012, Pages 139~145
DOI : 10.5050/KSNVE.2012.22.2.139
The shipboard working environment of navy vessel is very inferior to the ground working environment. For this reason, the crew of a navy vessel suffer from an occupational disease such as lumbar pain, hearing loss, etc. Although standard for navy vessel's environmental vibration is applied, the criterion of the environmental vibration is too high. So it doesn't help to improve habitability of crew. In this study, for improving its habitability of crew, the current vibration level of navy vessel was examined and the standard of navy vessel's environmental vibration was investigated.
Design of a New VSS-Adaptive Filter for a Potential Application of Active Noise Control to Intake System
Kim, Eui-Youl ; Kim, Byung-Hyun ; Kim, Ho-Wuk ; Lee, Sang-Kwon ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 2, 2012, Pages 146~155
DOI : 10.5050/KSNVE.2012.22.2.146
The filtered-x LMS(FX-LMS) algorithm has been applied to the active noise control(ANC) system in an acoustic duct. This algorithm is designed based on the FIR(finite impulse response) filter, but it has a slow convergence problem because of a large number of zero coefficients. In order to improve the convergence performance, the step size of the LMS algorithm was modified from fixed to variable. However, this algorithm is still not suitable for the ANC system of a short acoustic duct since the reference signal is affected by the backward acoustic wave propagated from a secondary source. Therefore, the recursive filtered-u LMS algorithm(FU-LMS) based on infinite impulse response(IIR) is developed by considering the backward acoustic propagation. This algorithm, unfortunately, generally has a stability problem. The stability problem was improved by using an error smoothing filter. In this paper, the recursive LMS algorithm with variable step size and smoothing error filter is designed. This recursive LMS algorithm, called FU-VSSLMS algorithm, uses an IIR filter. With fast convergence and good stability, this algorithm is suitable for the ANC system in a short acoustic duct such as the intake system of an automotive. This algorithm is applied to the ANC system of a short acoustic duct. The disturbance signals used as primary noise source are a sinusoidal signal embedded in white noise and the chirp signal of which the instantaneous frequency is variable. Test results demonstrate that the FU-VSSLMS algorithm has superior convergence performance to the FX-LMS algorithm and FX-LMS algorithm. It is successfully applied to the ANC system in a short duct.
Comparison of Draft Map and Digital Map for Analysis of Areas and Populations of Excessive Noise Exposure from Noise Maps
Yeon, Jung-Hum ; Lee, Byung-Chan ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 2, 2012, Pages 156~162
DOI : 10.5050/KSNVE.2012.22.2.156
This paper presents differences of road traffic noise maps were generated by using the draft map and two digital maps with different versions. As a first step, the calculation of the areas of excessive noise exposure was made for the draft map and each digital map version. Subsequently, the areas of excessive noise exposure were compared so as to determine how different from each other. Then, comparison of the populations exposed to excessive noise was also conducted in the same way. It was found that the most accurate noise map was obtained when using the combination of the draft map containing all attribute information and the digital map Ver 2.0. This result indicates that more information on the height and the number of floors of the individual building is required in order to obtain more accurate population exposed to excessive noise, thus creating a more accurate noise map.
Effect of Friction Curve on Brake Squeal Propensity
Kang, Jae-Young ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 2, 2012, Pages 163~169
DOI : 10.5050/KSNVE.2012.22.2.163
The brake squeal propensity associated with friction curve is investigated by using the hybrid finite element(FE)-analytical model. The modal analysis of an actual disc and pad is conducted by FE method. Also, the modeling for the accurate contact and disc rotation is analytically achieved. The eigenvalue analysis for the hybrid model provided the squeal dependency on the friction curve. Particularly, some pad modes and the disc torsion mode are shown to be sensitive for the friction curve.
Development of Power Amplifier for Piezoelectric Actuator and Control Algorithm Realization System for Active Vibration Control of Structures
Lee, Wan-Joo ; Kwak, Moon-K. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 2, 2012, Pages 170~178
DOI : 10.5050/KSNVE.2012.22.2.170
This paper is concerned with the development of power amplifier and controller for piezoelectric actuator and sensor used in smart structures. Even though a high-voltage power amplifier is provided in the form of an operational amplifier, a very high DC voltage is still necessary as a power supply. In this study, we propose a low-cost design for the power amplifier including the DC power supply. We also need a controller on which a control algorithm will be mounted. In general, a digital signal processing chip is popularly used because of high speed. However, only commercial product is available for smart structure applications. In this paper, a controller consisting of a DSP and electronic circuits suitable for piezoelectric sensor and actuator pair is proposed. To validate the proposed controller with power amplifier, experiment on smart structure was carried out. The experimental results show that the proposed control system can be effectively used for smart structure applications with low cost.
Impact Force and Acoustic Analysis on Composite Plates with In-plane Loading
Kim, Sung-Joon ; Hwang, In-Hee ; Hong, Chang-Ho ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 2, 2012, Pages 179~186
DOI : 10.5050/KSNVE.2012.22.2.179
The potential hazards resulting from a low-velocity impact(bird-strike, tool drop, runway debris, etc.) on aircraft structures, such as engine nacelle or leading edges has been a long-term concern to the aircraft industry. Certification authorities require that exposed aircraft components must be tested to prove their capability to withstand low-velocity impact without suffering critical damage. In most of the past research studies unloaded specimens have been used for impact tests, however, in reality it is much more likely that a composite structure is exposed to a certain stress state when it is being impacted, which can have a significant effect on the impact performance. And the radiated impact sound induced by impact is analyzed for the damage detection evaluation. In this study, an investigation was undertaken to evaluate the effect in-plane loading on the impact force and sound of composite laminates numerically.
Dynamic Characteristic Analyses of a Bearingless Helicopter Rotor System
Kee, Young-Jung ; Yun, Chul-Yong ; Kim, Doeg-Kwan ; Kim, Seung-Ho ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 2, 2012, Pages 187~192
DOI : 10.5050/KSNVE.2012.22.2.187
Recently, KARI(Korea Aerospace Research Institute) has been developing a modern 11.5 m diameter four bladed bearingless main rotor system, and this rotor system can be used for 7,000 lb class helicopter. Flexbeam and torque tube can be considered as key structural components, and large elastic twist of flexbeam induced by pitch control motion of torque tube can influence the nonlinear aeroelastic behavior. In this paper, the dynamic characteristic analysis results of bearingless rotor system were presented. In order to construct a input model and validate the analysis procedures, calculated results using the comprehensive helicopter analysis program CAMRAD II were compared with the measured natural frequencies and lag damping data from small-scale wind tunnel test. Next, the analysis model was extended to a full-scale model, and the dynamic analysis results were presented.
Effects of Vehicle Classification Methods on Noise Prediction Results of Road Traffic Noise Map
Kim, Ji-Yoon ; Park, In-Sun ; Jung, Woo-Hong ; Kang, Dae-Joon ; Park, Sang-Kyu ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 22, issue 2, 2012, Pages 193~197
DOI : 10.5050/KSNVE.2012.22.2.193
Road traffic noise map is effective method to save cost and time for environmental noise assessment. Generally, noise is calculated by using theoretical equation of noise prediction, and the calculated result can be influenced by various input factors. Especially, domestic vehicle classification method for traffic flow and heavy vehicle percentage is different from that of foreign countries. Thus, this can cause effect on the noise prediction results. In this study, noise prediction results by using domestic vehicle classification method are compared with those by foreign methods.