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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 20, Issue 12 - Dec 2010
Volume 20, Issue 11 - Nov 2010
Volume 20, Issue 10 - Oct 2010
Volume 20, Issue 9 - Sep 2010
Volume 20, Issue 8 - Aug 2010
Volume 20, Issue 7 - Jul 2010
Volume 20, Issue 6 - Jun 2010
Volume 20, Issue 5 - May 2010
Volume 20, Issue 4 - Apr 2010
Volume 20, Issue 3 - Mar 2010
Volume 20, Issue 2 - Feb 2010
Volume 20, Issue 1 - Jan 2010
Selecting the target year
Theoretical and Experimental Study on Airfoil Singing
Ahn, Byoung-Kwon ; Lee, Jong-Hyun ; Rhee, Wook ; Choi, Jong-Soo ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 2, 2010, Pages 115~121
DOI : 10.5050/KSNVE.2010.20.2.115
Periodic vortex separations generate periodic vertical forces acting on a trailing edge of an airfoil. When a natural frequency of the trailing edge of the airfoil is close to a vortex shedding frequency, an amplitude of the edge oscillation becomes maximal; it makes intensive noise called singing. Motion of the trailing edge may also feedback to the vortex shedding so that self-sustained oscillation appears, and a resonant frequency is locked in some interval of the speed of the incident flow. In this study, a theoretical model is proposed and applied for modeling an airfoil singing. Results are compared with experimental measurements which are carried out in an anechoic wind tunnel.
Control of Active Engine Mount System Featuring MR Fluid and Piezostack via HILS
Lee, Dong-Young ; Choi, Seung-Bok ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 2, 2010, Pages 122~128
DOI : 10.5050/KSNVE.2010.20.2.122
This paper presents vibration control performance of active engine mount system installed with the magneto-rheological(MR) mount and the piezostack mount. The performance is evaluated via hardware-in-the-loop-simulation(HILS) method. As a first step, six degrees-of freedom dynamic model of an in-line four-cylinder engine which has three point mounting system is derived by considering the dynamic behaviors of MR mount and piezostack mount. As a second step, sliding mode controller(SMC) is synthesized to actively control the imposed vibration. In order to demonstrate the effectiveness of the proposed active engine mount, vibration control performances are evaluated under various engine operating speeds(wide frequency range) using HILS method and presented in time and frequency domain.
Position Tracking Control of Flexible Piezo-beam Considering Actuator Hysteresis
Nguyen, Phuong-Bac ; Choi, Seung-Bok ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 2, 2010, Pages 129~137
DOI : 10.5050/KSNVE.2010.20.2.129
This paper presents a position tracking control of a flexible beam using the piezoelectric actuator. This is achieved by implementing both feedforward hysteretic compensator of the actuator and PID feedback controller. The Preisach model is adopted to develop the feedforward hysteretic compensator. In the design of the compensator, estimated displacement of the piezoceramic actuator is used based on the limiting triangle database that results from collecting data of the main reversal curve and the first order ascending curves. Experimental implementation is conducted for position tracking control and performance comparison is made between a PID feedback controller without considering the effect of hysteresis, and a PID feedback controller integrated with the feedforward hysteretic compensator.
Noise Reduction of a Hydraulic Breaker by Change of a Chisel
Kim, Cheol-Ho ; Kim, In-Sik ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 2, 2010, Pages 138~143
DOI : 10.5050/KSNVE.2010.20.2.138
Hydraulic breakers are widely used for mining and construction engineering area but make serious noise problem. The noise is generated between a chisel and a piston when they are hit by a fluid power. This study proposed noise reduction method by the change of a chisel in a hydraulic breaker. In the new design, a different material is inserted inside of a chisel. The proposed design is analyzed and simulated by the use of a numerical method. A chisel by the new design was installed in a hydraulic breaker and experimented for sound pressure level. As a result, the noise of hydraulic breaker can be reduced more than 4 dB by simply changing a chisel.
Free Vibrations of Tapered Circular Arches with Constant Volume
Lee, Byoung-Koo ; Lee, Tae-Eun ; Yoon, Hee-Min ; Choi, Jong-Min ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 2, 2010, Pages 144~152
DOI : 10.5050/KSNVE.2010.20.2.144
This paper deals with free vibrations of the tapered circular arches with constant volume, whose cross sectional shape is the solid regular polygon. Volumes of the objective arches are always held constant regardless shape functions of the cross-sectional depth. The shape functions are chosen as the linear, parabolic and sinusoidal ones. Ordinary differential equations governing free vibrations of such arches are derived and solved numerically for determining the natural frequencies. In the numerical examples, hinged-hinged, hinged-clamped and clamped-clamped end constraints are considered. As the numerical results, the relationships between non-dimensional frequency parameters and various arch parameters such as rise ratio, section ratio, side number, volume ratio and taper type are reported in tables and figures.
Start-up Noise Reduction of Reciprocating Compressor Using Cavity Resonance Analysis
Kim, Min-Chul ; Kim, Won-Jin ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 2, 2010, Pages 153~159
DOI : 10.5050/KSNVE.2010.20.2.153
This work focuses on finding a method to reduce the noise of a hermetic reciprocating compressor during start-up using an acoustical analysis. The noise of compressor during start-up, which is a higher level than that of a normal operating condition, has transient and non-stationary characteristics. The acoustical analysis of compressor cavity is performed to find an effective method to reduce the noise level. In the acoustical analysis, the shape variations of frequency response function in the neighborhood of resonances are tested for three parameters: the height of remained oil, the suction position of refrigerant and the position of driving part. As a conclusion of this result, to reduce the emission noise of compressor during start-up, the height of remained oil should be kept at 16 mm, the refrigerant should be sucked at the cross point of nodal lines of X and Y directional cavity modes, and the driving part should be positioned in the center of cavity.
Characteristics of Industrial Machinery Noise
Kang, Dae-Joon ; Gu, Jin-Hoi ; Lee, Jae-Won ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 2, 2010, Pages 160~165
DOI : 10.5050/KSNVE.2010.20.2.160
As the various industrial machinery has come into being by development of industrial technology, the productivity of the basic industrial machinery has improved. However, at the same time, noise from various industrial machinery disturbs the quiet environment. There are 35 kinds of the noise emission machinery defined in the noise and vibration control act according to the horse power and the number of machinery. These were classified in 1992, and the characteristics of the noise emission machinery may be different from the past one. So we need to investigate the characteristics of the noise emitted by machinery to control it rightly. We measured sound intensity of 32 noise emission machinery to calculate the sound power levels of those and investigated the characteristics of the sound power level of those according to the frequency. We found that the forging machine, concrete pipe and pile making machine, sawing machine, etc. are noisy. The generator, the concrete pipe and pile making machine, etc. emit the low frequency noise, but the molding machine, the stone cutter, the metal cutter, etc. emit the high frequency noise.
Development of a Wireless Vibration Monitoring System for Structural Health Evaluation
Shim, Bo-Gun ; Lee, Shi-Bok ; Chae, Min-Sung ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 2, 2010, Pages 166~171
DOI : 10.5050/KSNVE.2010.20.2.166
Wired monitoring systems have been used for damage detection and dynamic analysis of large structures(bridges, dams, plants, etc.). However, the real-world applications still remain limited, mainly due to time and cost issues inherent to wired systems. In recent years, an increasing number of researchers have adopted WSN(wireless sensor network) technologies to the field of SHM(structural health monitoring). Accurate time synchronization is most critical for the wireless approach to be feasible for SHM purpose, along with sufficient wireless bandwidth and highly precise measuring resolution. To satisfy technical criteria stated above, a wireless vibration monitoring system that uses high-precision MEMS(micro-electro-mechanical system) sensors and A/D convertor is discussed in detail. It was found experimentally that the level of time synchronization fell within
Study on the Annoyance Response in the Area Exposed by Road Traffic Noise and Railway Noise
Ko, Joon-Hee ; Chang, Seo-Il ; Son, Jin-Hee ; Lee, Kun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 2, 2010, Pages 172~178
DOI : 10.5050/KSNVE.2010.20.2.172
The multiple regression analysis and path analysis in each dominant area of noise source are conducted to analyze the relationship between dependent variables like annoyance and independent ones such as noise and non-noise factors. The multiple regression analysis shows that impact of noise factors is the highest to annoyance in dominant areas of road traffic and railway noise. Meanwhile, impact of non-noise factors such as sensitivity and satisfaction of environment on annoyance is also high in these areas. The path analysis result for multivariate analysis between various independent and dependent variables is similar to that of the multiple regression analysis. However, noise factor is the greatest factor influent on annoyance in the dominant areas of the combined noise, and relationship between annoyance and sensitivity is the highest in combined area exposed to road traffic noise and railway noise.
Investigation Research on the Residents Satisfaction Rating to the Floor Impact Sound in Apartment Buildings
Kim, Kyoung-Woo ; Choi, Hyun-Jung ; Kim, Young-Su ; Yang, Kwan-Seop ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 2, 2010, Pages 179~184
DOI : 10.5050/KSNVE.2010.20.2.179
In this study, the satisfaction rating to the floor impact sound was investigated for the residents in the apartment Building where the business scheme had been approved after 2005. The results are compared with existing research. The questionnaire survey was conducted to the 597 residents in 14 apartments complex which were applied with standard floor structure and approval floor structure. Most of respondents(71.1 %) answered that the performance of floor impact sound insulation, in case of standard floor structure, was improved compared to the apartments where they used to live. Comparing with the questionnaire survey result of existing research, the answered ratio of `less annoyed` and `less loud` is somewhat increased.
Application of the AE Technique for The Detection of Shaft Crack with Low Speed
Gu, Dong-Sik ; Kim, Jae-Gu ; Choi, Byeong-Keun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 2, 2010, Pages 185~190
DOI : 10.5050/KSNVE.2010.20.2.185
Condition monitoring(CM) is a method based on non-destructive test(NDT). So, recently many kind of NDT were applied for CM. Acoustic emission(AE) is widely used for the early detection of faults in rotating machinery in these days because of high sensitivity than common accelerometers and detectable low energy vibration signals. And crack is considered one of severe fault in the rotating machine. Therefore, in this paper, study on early detection using AE has been accomplished for the crack of the low-speed shaft. There is a seeded initial crack on the shaft then the AE signal had been measured with low-speed rotation as the applied load condition. The signal detected from crack in rotating machine was detected by the AE transducer then the trend of crack growth had found out by using some of feature values such as peak value, skewness, kurtosis, crest factor, frequency center value(FC), variance frequency value(VF) and so on.
Acoustic Properties of Temporary Noise Barriers on Construction Site
Chung, Jin-Yun ; Im, Jung-Bin ; Lee, Sung-Chan ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 2, 2010, Pages 191~198
DOI : 10.5050/KSNVE.2010.20.2.191
The noise by the construction activities is one of the main issues in Korea. To prevent the noise from construction site, construction company installs temporary noise barriers along the construction site boundary. Normally sound insulation performance (
) of the temporary noise barriers made by metal or plastic is between 18 and 31 dB and metallic noise barriers are around 5 dB higher than plastic noise barriers. Sound absorption performance (NRC) of the temporary noise barriers are between 0.20 and 0.59 so it`s difficult to characterize their acoustic performance. In this study, it has founded that sound insulation performance of the temporary noise barrier has been improved about 3dB by stick the high density acoustic sheet and insertion loss of noise barrier is getting increased as the source and receiver approached the temporary noise barriers.
Effects of Grid Size on Noise Prediction Results of Road Traffic Noise Map
Kim, Ji-Yoon ; Park, In-Sun ; Park, Chan-Youn ; Park, Sang-Kyu ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 20, issue 2, 2010, Pages 199~204
DOI : 10.5050/KSNVE.2010.20.2.199
Noise map is very efficient tool to evaluate the road traffic noise. However, calculation time and accuracy of noise map heavily depend on the grid size of noise map. In this study, effects of grid size on the prediction results of road traffic noise map have been investigated in detail for urban and rural areas, respectively, and efficient grid size for the noise map has been proposed.