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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
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Journal DOI :
The Korean Society for Noise and Vibration Engineering
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Volume & Issues
Volume 21, Issue 12 - Dec 2011
Volume 21, Issue 11 - Nov 2011
Volume 21, Issue 10 - Oct 2011
Volume 21, Issue 9 - Sep 2011
Volume 21, Issue 8 - Aug 2011
Volume 21, Issue 7 - Jul 2011
Volume 21, Issue 6 - Jun 2011
Volume 21, Issue 5 - May 2011
Volume 21, Issue 4 - Apr 2011
Volume 21, Issue 3 - Mar 2011
Volume 21, Issue 2 - Feb 2011
Volume 21, Issue 1 - Jan 2011
Selecting the target year
Multi-axial Stress Analysis and Experimental Validation to Estimate of the Durability Performance of the Automotive Wheel
Jung, Sung-Pil ; Chung, Won-Sun ; Park, Tae-Won ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 10, 2011, Pages 875~882
DOI : 10.5050/KSNVE.2011.21.10.875
In this paper, the finite element analysis model of the mult-axial wheel durability test configuration is created using SAMCEF. Mooney-Rivlin 2nd model is applied to the tire model, and the variation of the air pressure inside the tire is considered. Vertical load, lateral load and camber angle are applied to the simulation model. The tire rotates because of the friction contact with a drum, and reaches its maximum speed of 60 km/h. The dynamics stress results of the simulation and experiment are compared, and the reliability of the simulation model is verified.
Study on the Sound Quality Evaluation Method for the Vehicle Diesel Engine Noise
Kwon, Jo-Seph ; Kim, Chan-Mook ; Kim, Ki-Chang ; Kim, Jin-Taek ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 10, 2011, Pages 883~889
DOI : 10.5050/KSNVE.2011.21.10.883
The brand sound of vehicle diesel engine is recently one of the important advantage strategies in the automotive company. Because various noise components masked under high frequency level can be audible in quieter driving situation. Many researches have been carried out for subjective and objective assessments on vehicle sounds and noises. In particular, the interior sound quality has been one of research fields that can give high quality feature to vehicle products. Vehicle interior noise above 500 Hz is usually controlled by sound package parts. The materials and geometries of sound package parts directly affect on this high frequency noise. This paper describes the sound quality evaluation method for the vehicle diesel engine noise to establish objective criteria for sound quality assessment. Considering the sensitivity of human hearing to impulsive sounds such as diesel noise, the human auditory mechanism was simulated by introducing temporal masking in the time domain. Furthermore, each of the human auditory organs was simulated by computer codes, providing reasonable analytical explanations of typical human hearing responses to diesel noise. This method finally provides the sound quality index of vehicle diesel engine noise that includes high frequency intermittent offensive sounds caused by impacting excitations of combustion and piston slap.
Acoustic Performance Study of FRP Acoustic Window
Seo, Young-Soo ; Kang, Myeng-Whan ; Shin, Ku-Kyun ; Jeon, Jae-Jin ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 10, 2011, Pages 890~896
DOI : 10.5050/KSNVE.2011.21.10.890
For developing acoustic window, transmission loss in accordance with incident angle was calculated and compared with measurement results. In design stage, the material choice of acoustic window is very important because the material is one of main parameters of transmission loss and structural strength. In order to analyze the effect of material properties on transmission loss, the parametric studies were carried out and the results were discussed in this paper. And, to verify the design specification of acoustic window, measurement was carried out and the results were compared and analyzed.
Study of Apparent Mass and Apparent Eccentric Mass to Vertical Whole-body Vibration by Using Strain-gage Type Six-axis Force Plate
Jeon, Gyeoung-Jin ; Kim, Min-Seok ; Ahn, Se-Jin ; Jeong, Weui-Bong ; Yoo, Wan-Suk ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 10, 2011, Pages 897~904
DOI : 10.5050/KSNVE.2011.21.10.897
When whole-body is exposed to vertical vibration, asymmetry shape of human body affects the response on the translational(fore-aft, lateral, vertical) and rotational(roll, pitch, yaw) motion. While the translational motion has been studied with various titles, it has been rare to study the rotational motion of human body exposed to vertical excitation because of lack of experimental equipment. This study was performed by using a 6-axis force plate installing strain gage type sensors for the rotational response. Sixteen male subjects were exposed to vertical vibration on rigid seat in order to investigate apparent mass of three translational motion and apparent eccentric mass of three rotational motion. Random signal was generated to make excitation vibration which was on an effective frequency range of 3~40 Hz, and magnitude of 0.224 m/
r.m.s. The frequency range and magnitude used was selected for the vibration of passenger vehicle on idling condition. As the result, cross-axis apparent masses of fore-and-aft and lateral direction were not significant showing 20 % and 3 % of vertical apparent mass relatively. And apparent eccentric mass of pitch motion was dominant when compared to that of roll and yaw motion, which is reasoned by asymmetry direction of human body sitting on a seat.
Vibration Analysis for Partially Immersed Shell Structure in Water with Gap from Bottom
Koo, Jae-R. ; Kwak, Moon-K. ; Song, Oh-S. ; Bae, Chun-H. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 10, 2011, Pages 905~915
DOI : 10.5050/KSNVE.2011.21.10.905
The free flexural vibration of a hanged clamped-free cylindrical shell partially submerged in water with gap from bottom is investigated. The fluid is assumed to be inviscid and irrotational. The cylindrical shell is modeled by using the Rayleigh-Ritz method based on the Sanders shell theory. The kinetic energy of the fluid is derived by solving the boundary-value problem related to the fluid motion. The natural vibration characteristics of the partially submerged cylindrical shell are discussed with respect to the added virtual mass approach. In this study, experiments were carried out to confirm theoretical results. It was found that theoretical prediction is in good agreement with experimental results.
Prediction of Two-phase Flow Patterns and Noise Evaluation for Evaporator Pipe in a Refrigerator
Heo, So-Jung ; Kim, Min-Seong ; Han, Hyung-Suk ; Jeong, Weui-Bong ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 10, 2011, Pages 916~923
DOI : 10.5050/KSNVE.2011.21.10.916
The refrigerant after the expansion valve interchanges the heat at the evaporator. At this moment, the state of gas and liquid becomes two-phase flow and causes irregular noise. In order to avoid the noise, the two-phase flow pattern should be predicted. In this paper, the procedure to predict the two-phase flow patterns such as churn flow and annular flow was suggested using the CFD software. The experiments using refrigerant-supplying equipment was carried out and the noise levels according to the flow pattern were measured. The flow patterns predicted by this procedure showed good agreement with those by experiments. The churn flow is noisier than annular flow pattern.
Experimental Verification of Mode-selectivity and Effects of Parameters on Outputs in a Noncontact Vibration Exciter for a Shaft
Lee, Ho-Cheol ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 10, 2011, Pages 924~933
DOI : 10.5050/KSNVE.2011.21.10.924
The possibility of noncontact excitation of vibrations in a shaft was investigated in order to enable online structural health monitoring of a shaft during its rotating condition without stop operation. The proposed noncontact exciter was devised to exclusively generate one of two shaft vibration modes, so called longitudinal and flexural. Using the prototypes and a lot of experiments on them, it was proven that bias magnetic field, exciting voltage, center frequency, and geometry of yokes have crucial impacts on its output characteristics.
Experimental Study on Walking Motion by Ankle Electromyograms
Hong, J.H. ; Chun, H.Y. ; Jeon, J.H. ; Jung, S.I. ; Kim, J.O. ; Park, K.H. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 10, 2011, Pages 934~939
DOI : 10.5050/KSNVE.2011.21.10.934
This paper experimentally deals with the relationship between the ankle electromyogram(EMG) and walking motion in order to activate the ankle joint of a walking-assistance robot for rehabilitation. Based on the anatomical structure and motion pattern of an ankle joint, major muscles were selected for EMG measurements. Surface EMG signals were monitored for several human bodies at various stride distances and stride frequencies. Root-mean-squared magnitude of EMG signals were related with the walking conditions. It appeared that the magnitude of the ankle EMG signal was linearly proportional to the stride distance and stride frequency, and thus to the walking speed.
Active Vibration Control of Plates Using Filtered Velocity Feedback Controllers
Shin, Chang-Joo ; Hong, Chin-Suk ; Jeong, Weui-Bong ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 10, 2011, Pages 940~950
DOI : 10.5050/KSNVE.2011.21.10.940
This paper reports a filtered velocity feedback(FVF) controller, which is an alternative to direct velocity feedback(DVFB) controller. The instability problems at high frequencies due to non-collocated sensor/actuator configuration with the DVFB can be alleviated by the proposed FVF controller. The FVF controller is designed to filter out the unstable high frequency response. The dynamics of a clamped plate under forces and moments and the FVF controllers are formulated. The stability of the control system and performance are investigated with the open loop transfer function(OLTF). It is found that the FVF controller has a higher gain margin than the corresponding DVFB controller owing to the rapid roll-off behavior at high frequencies. Although the gain margin cannot be fully utilized because of the enhancement at the high frequencies, the vibration at the modes lower than the tuning frequency is well controlled. This performance of the FVF controller is shown to be improved from that of the DVFB controller. It is, however, noted that the stability around the tuning frequency is very sensitive so that the enhancement in vibration level should be followed. The reduction performance at low frequencies using the FVF controller should be compromised with the enhancement in the vibration at high frequencies while designing the controller.
LOS(line-of-sight) Stabilization Control of OTM(on-the-move) Antenna Driven by Geared Flexible Transmission Mechanism
Kang, Min-Sig ; Yoon, Wo-Hyun ; Lee, Jong-Bee ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 10, 2011, Pages 951~959
DOI : 10.5050/KSNVE.2011.21.10.951
In this study, an OTM(on-the-move) antenna which is mounted on ground vehicles and is used for mobile communication between vehicle and satellite while moving was addressed. Since LOS(line-of-sight) of antenna should direct satellite consistently while vehicle moving to guarantee high satellite communication quality, active antenna LOS stabilization is a core technology for OTM antenna. Stabilization of a satellite tracking antenna which consists of 2-DOF gimbals, an elevation gimbal over an azimuth gimbal, was considered in this study. In consideration of driving mechanism which consists of gear train and flexible driving shafts, a two-mass-system dynamic model coupled with vehicle motion was presented. An internal PI-control loop + outer PI-control loop structure has been suggested in order to damp the torsional vibration and stabilize control system. The classical pole-placement method was applied to design control gains. In addition, a vehicle motion compensation control beside of the feedback control loop has been suggested to improve LOS stabilization performances. The feasibility of the proposed control design was verified along with some experimental results.
Development of an Improved NDIF Method for Efficiently Extracting Eigenvalues and Eigenmodes of Arbitrarily Shaped Acoustic Cavities
Kang, S.W. ; Yon, J.I. ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 10, 2011, Pages 960~966
DOI : 10.5050/KSNVE.2011.21.10.960
An improved NDIF method is introduced to efficiently extract eigenvalues and eigenmodes of two-dimensional, arbitrarily shaped acoustic cavities. The NDIF method, which was developed by the authors for the eigen-mode analysis of arbitrarily shaped acoustic cavities, membranes, and plates, has the feature that it yields highly accurate eigenvalues compared with other analytical methods or numerical methods(FEM and BEM). However, the NDIF method has the weak point that the system matrix of the NDIF method depends on the frequency parameter and, as a result, a final system equation doesn`s take the form of an algebra eigenvalue problem. The system matrix of the improved NDIF method developed in the paper is independent of the frequency parameter and eigenvalues and mode shapes can be efficiently obtained by solving a typical algebraic eigenvalue problem. Finally, the validity and accuracy of the proposed method is verified in two case studies, which indicate that eigenvalues and mode shapes obtained by the proposed method are very accurate compared to the exact method, the NDIF method or FEM(ANSYS).
Development of Power Flow Boundary Element Method for 3-dimensional Multi-domain Noise Analysis
Kim, Jong-Do ; Hong, Suk-Yoon ; Song, Jee-Hun ;
Transactions of the Korean Society for Noise and Vibration Engineering, volume 21, issue 10, 2011, Pages 967~974
DOI : 10.5050/KSNVE.2011.21.10.967
The direct and indirect PFBEM(power flow boundary element method) for the treatment of the 3 dimensional multi-domain problems are proposed to predict the acoustic energy density in medium to high frequency ranges. In the proposed method, the equation is derived in a matrix form by considering coupled relationships of the power flow at the interface of given domains. The proposed method can successfully obtain the analytical solutions for the problems of coupled cubes and the small-scale reverberant chamber. Then the experiment is carried out to obtain STL(sound transmission loss) by using small-scale reverberant chamber and the results are compared with analysis results.