권호 표지

Transactions of the Korean Society for Noise and Vibration Engineering (한국소음진동공학회논문집)

The Korean Society for Noise and Vibration Engineering

  • Bimonthly
  • /
  • 1598-2785(pISSN)
  • /
  • 2287-5476(eISSN)

Domain

  • Environment ＞ Noise/Vibration Control and Management

Aim & Scope

This journal is bi-monthly published and the purpose is to devote the prompt publication of original articles on any aspect of noise and vibration issues in various fields including mechanical engineering, construction engineering, environmental engineering and so on. This journal publishes fundamental work, theoretical analysis, experimental investigation and practical application on noise, vibration and shock problems in various fields including mechanical engineering and environmental engineering. Recently, articles on advanced technology of active noise and vibration control are also published in this journal. Originally, this journal was launched by Korean Society for Noise and Vibration Engineering (KSNVE) as a Korean Journal in 1991. The articles written in English are being increased, but most of the articles are still written in Korean. The KSNVE now strongly suggests the authors to submit articles written in English to promote this journal as a prestigious international journal. Recently, Korea Research Foundation announced the rank of the KCI (Korean Citation Index). This journal was ranked 54th among 188 KCI engineering and science journals (in 2008). In related engineering fields such as mechanical and automotive engineering, this journal was ranked as one of the top 5 high quality journals.

http://acoms.atit.co.kr:9090/ksnve/index.jsp?publisher_cd=ksnve KSCI KCI

Volume 26 Issue 6_spc

  1. Min, Dong-Ju;Park, Jae-gyun;Kim, Moon-Young 635
    https://doi.org/10.5050/KSNVE.2016.26.6.635 PDF KSCI
    안정성 지도(stability map)을 이용하여 부분 종동력(sub-tangentailly follower force)를 받는 외팔 기둥의 동적안정성 이론을 요약한다. Rayleigh 감쇠를 가정하여 내적 및 외적 감쇠효과를 2개의 감쇠비를 통하여 반영하고, 감쇠비 변화에 따른 플러터하중의 변화와 관련된 매개변수 연구를 수행한다. 또한, 종동력을 받는 외팔기둥에 대한 진동수 방정식의 엄밀해를 유도하고, 특정 감쇠비 범위에 대한 안정성 지도를 유한요소 해석결과와 함께 비교/분석한다.
  2. Bae, Kyu-Young;Yong, Jae Chul;Kim, Lee-Hyeon;Kwon, Sam-Young 644
    https://doi.org/10.5050/KSNVE.2016.26.6.644 PDF KSCI
    Track maintenance works based on track geometry recordings are essential to enhance the safety and comfort of railway transportation. Usually, the track irregularity has been measured by a special inspection trains which all were imported from abroad. Because the inspection train speed is limited under 160 km/h, it takes a long time to inspect railways and there is difficulty in daytime operation. To solve this problem, we started to develop a track geometry measuring system (TGMS) with measurement speed up to 300 km/h which can be installed in commercial vehicles such as HEMU-430X. In this paper, we introduce a newly developed inertial TGMS and propose two inertial navigation system (INS) algorithms (method A, B) for measuring track geometry. In order to investigate advantage and disadvantage of each algorithm, we performed vibration test of the TGMS, which was simulated by 6-axis shaking table. Through the vibration test, we analyzed the influence of vehicle vibration on the TGMS which will be installed on bogie frame. To the vibration test, two methods satisfied the required accuracy of track geometry measurement under the level of the actual vehicle vibration of HEMU-430X train. Theoretically, method A is sensitive to vehicle vibration than method B. However, HEMU-430X's bogie vibration frequency range is out of interest range of measurement system. Therefore, method A can also apply the HEMU-430X train.
  3. Lee, Myung Jun;Jeon, Jun Young;Park, Gyuhae;Kang, To;Han, Soon Woo 651
    https://doi.org/10.5050/KSNVE.2016.26.6.651 PDF KSCI
    Condition monitoring (CM) encounters a large data problem due to sensors that measure vibration data with a continuous, and sometimes, high sampling rate. In this study, compressive sensing approaches for condition monitoring are proposed to demonstrate the efficiency in handling a large amount of data and to improve the damage detection capability of the current condition monitoring process. Compressive sensing is a novel sensing/sampling paradigm that takes much fewer samples compared to traditional sampling methods. For the experiments a built-in rotating system was used and all data were compressively sampled to obtain compressed data. Optimal signal features were then selected without the reconstruction process and were used to detect and classify damage. The experimental results show that the proposed method could improve the data processing speed and the accuracy of condition monitoring of rotating systems.
  4. Kim, Wan Ho;Park, Jhin Ha;Yang, Soon Yong;Shin, Cheol Soo;Choi, Seung-Bok 660
    https://doi.org/10.5050/KSNVE.2016.26.6.660 PDF KSCI
    This paper presents performance comparison results of magneto-rheological (MR) brake in the sense of wear characteristics. To create wear circumstance, the brake is operated in 100 000 cycles by DC motor. To make wear test in same design parameters such as the radius of the housing, ferromagnetic disc and gap size, small sample of stainless are inserted in housing of MR brake. The performances of brake are compared between the initial stage (no wear) and 100 000 revolution cycles operated stage (wear). At each circumstance, torque of the brake is measured and compared by applying step current and sinusoidal control input. The controller used in this work is a simple, but effective PID controller. It is demonstrated that the wear behavior is more obvious as the operating cycle is increased in the torque control process.
  5. Choi, Wonhong 667
    https://doi.org/10.5050/KSNVE.2016.26.6.667 PDF KSCI
    Canister with composite sandwich panel has been suggested owing to its higher stiffness and strength over a weight for square shaped canisters. The pyro shock induced by a short time explosion inside a canister is generally considered to be the most severe source of load affecting on the entire structure. Therefore, in this study, the approach and modeling method to identify the effect of pyro shock on canister with composite sandwich panel in a numerical way were mainly discussed. Moreover, the verification was implemented through comparison with test results.
  6. Lee, Jae Kwan;Yoon, Eun Sun;Jang, Chae Mi;Jae, Sae Young;Chang, Seo-Il 674
    https://doi.org/10.5050/KSNVE.2016.26.6.674 PDF KSCI
    According to the conventional studies on the noise and cardiovascular effect, railway noise is better associated with hypertension and adverse cardiovascular events than road traffic noise. But the underlying mechanisms remain unclear. We investigated the hypothesis that exposure to acute railway noise would the unfavorable effect of cardiovascular and autonomic system in healthy young subjects. Using a randomized, sham-controlled cross-over design, ten subjects were assigned to receive either an exposure to high speed train noise (84 dB) for 30 minutes or a control condition (non noise), separated by two days. Blood pressure, heart rate, augmentation index and heart rate variability as indices of cardiovascular and autonomic system function were measured at baseline, during, and recovery from two trials. The results show that exposure to acute railway noise significantly increased diastolic blood pressure and augmentation index, which may cause of adverse cardiovascular effects.
  7. Yoon, Joo Young;Oh, Wonseok;Park, No-Cheol;Park, Young-Pil 680
    https://doi.org/10.5050/KSNVE.2016.26.6.680 PDF KSCI
    In an optical disc archive system, disc insertion process is an important part. Furthermore, dynamic analysis with the contact area between multi-bent leaf spring and a disc should be considered because the contact area is moved when the disc is inserted into the cartridge. In this paper, a finite element model of disc insertion was constructed based on dynamic characteristics, vertical stiffness, and dynamic response. The disc insertion model was validated with the experimental results. To identify the dynamic response of the disc induced by the changed contact area, applied force to the disc and the stiffness of the multi-bent leaf spring were analyzed. As the results, the factors which cause the failure of the disc insertion were investigated.
  8. Cho, Wan-Ho;Kwon, Hyu-Sang;Cho, Yo-Han;Seo, Hee-Seon 687
    https://doi.org/10.5050/KSNVE.2016.26.6.687 PDF KSCI
    A series of process to design an acoustic lens for underwater imaging is reviewed and the method to evaluate characteristics of the lens is investigated. If the target specification of lens is given, the design process consists of the material selection, evaluation of its properties, lens geometry design, prediction of lens characteristics, manufacturing, and evaluation by measurement. In this study, an actual acoustical lens is made by cutting polymethylpentene block. The characteristics of lens are predicted by the hybrid method, combination of ray tracing and Rayleigh integral. For the direct comparison between the prediction and measurement results, a simulation method based on the equivalent source method is suggested to reflect the actual radiation pattern of transducer used for measurements. Finally, the measurement is conducted in a small water tank to observe the actual characteristics of the manufactured lens.
  9. Kim, Sanghaun;Kim, Gyeong-Ho;Sun, Jongoh;Cho, Yeong-Garp;Kim, Jung-Hyun;Jung, Taeck-Hyung;Lee, Kwan-Hee 697
    https://doi.org/10.5050/KSNVE.2016.26.6.697 PDF KSCI
    The second shutdown drive mechanism (SSDM) that is classified into seismic category I as an active mechanical equipment shall maintain the structural integrity and its designed inherent safety functions during and/or after normal operation, anticipated operational occurrences, accidents and seismic occurrences. Therefore, not only a structural integrity assessment through numerical analyses but also a qualification test by using the prototype SSDM shall be conducted to verify the adequacy of the SSDM design. This paper describes a sort of seismic qualification test of the prototype SSDM to demonstrate that the structural integrity and operability (functionality) of SSDM are maintained during and/or after seismic excitations. From the results, this paper shows that the SSDM satisfies all design requirements without any malfunctions during and after the seismic test.
  10. Seol, Hanshin;Park, Cheolsoo;Kim, Ki-Sup 705
    https://doi.org/10.5050/KSNVE.2016.26.6.705 PDF KSCI
    Underwater noise produced by ships has been becoming an increasing issue. A dominantly contributing noise source is a ship propeller. Therefore, it is important to predict the propeller noise at the propeller design stages. This study applied the acoustic analogy based on Ffowcs Williams equation for the prediction of the marine propeller BPF noise. A marine propeller BPF noise is investigated experimentally as well as numerically. Propeller BPF noise measurement and propeller cavitation observation tests are performed in the KRISO medium size cavitation tunnel. Numerical prediction schemes of marine propeller BPF noise are presented together with the noise measurement method. Propeller BPF noise predictions and experiments are performed under the various propeller operating conditions including non-cavitating and caveating conditions. Numerical and experimental results are compared and analyzed. It is shown that numerical prediction results are generally in good agreement with the measured data.
  11. Yu, Hyeon Tak;Ahn, Byung Hyun;Lee, Jong Myeong;Ha, Jeong Min;Choi, Byeong Keun 714
    https://doi.org/10.5050/KSNVE.2016.26.6.714 PDF KSCI
    Rubbing and misalignment are the most usual faults that occurs in rotating machinery and with them severe effect on power plant availability. Especially blade rubbing is hard to detect on FFT spectrum using the vibration signal. In this paper, the possibility of feature analysis of vibration signal is confirmed under blade rubbing and misalignment condition. And the lab-scale rotor test device provides the blade rubbing and shaft misalignment modes. Feature selection based on GA (genetic algorithm) is processed by the extracted feature of the time domain. Then, classification of the features is analyzed by using SVM (support vector machine) which is one of the machine learning algorithm. The results of features selection based on GA compared with those based on PCA (principal component analysis). According to the results, the possibility of feature analysis is confirmed. Therefore, blade rubbing and shaft misalignment can be diagnosed by feature of vibration signal.
  12. Park, Sung Gyu;Lee, Shi Bok 721
    https://doi.org/10.5050/KSNVE.2016.26.6.721 PDF KSCI
    The combined rotational and translational dynamic vibration absorbers (DVA) with no dampers for the beam vibration control can effectively isolate the vibration within the external excitation force region. This paper investigates the damping efficacy for the combined rotational and translational dynamic vibration absorbers to impose some robustness to the DVA system for the excitation force frequency variation. The beam is assumed to be subjected to a concentrated harmonic excitation force. The solution to the problem is found based on Galerkin method.
  13. Kim, Kab Bae;Chung, Eun-Kyo;Kim, Jong-Kyu;Park, Hae Dong;Kang, Joon Hyuk 729
    https://doi.org/10.5050/KSNVE.2016.26.6.729 PDF KSCI
    According to the survey for working environment of the cashiers in highway tollbooths, workers replied that noise was the most harmful substances next to air pollutant in the tollbooth. Researches on the noise levels exposed to cashiers in the highway tollbooth scarcely have been performed. Therefore, the aim of this study was to acquire baseline data to prevent health impairments of the cashiers by evaluating noise level exposed to them. Noise dosimeters were used for monitoring workers' noise exposure level in the tollbooths at 8 different highway tollgates. The noise levels of tollbooths did not exceed noise exposure limit of the ministry of labor, 90 dB(A). The average TWA inside of the tollbooths was 55.4 dB(A) and the average TWA outside of tollbooths was 58.3 dB(A). The average TWA outside of tollbooths was slightly higher than that of inside of tollbooths. However, the significance probability(p-value) was 0.255 which means statistically not significant. The noise levels inside and outside of tollbooth were statistically significant to both mean traffic volume per day and traffic volume of passenger car.
  14. Song, KeunWoong;Choi, JongSoo 736
    https://doi.org/10.5050/KSNVE.2016.26.6.736 PDF KSCI
    This study describes optimization methods for adjustment of helicopter main rotor tracking and balancing (RTB). RTB is a essential process for helicopter operation and maintenance. Linear and non-linear models were developed with past RTB test results for estimation of RTB adjustment. Then global and sequential optimization methods were applied to the each of models. Utilization of the individual optimization method with each model is hard to fulfill the RTB requirements because of different characteristics of each blade. Therefore an ensemble model was used to integrate every estimated adjustment result, and an adaptive method was also applied to adjustment values of the linear model to update for next estimations. The goal of this developed RTB adjustment optimization program is to achieve the requirements within 2 run. Additional tests for comparison of weight factor of the ensemble model are however necessary.
  15. Kim, Sang-Hyun;Jeon, Jong-Ik;Kim, Byung-Jun;Lee, Jeung;Choi, Ji-Ho;Hwang, Ki-Min 744
    https://doi.org/10.5050/KSNVE.2016.26.6.744 PDF KSCI
    A large satellite communication terminal on the truck shall be designed ruggedly against a disturbance for holding a position which satisfies communication performance. Especially. A design considering a wind is essential for getting into a communication with a satellite in a strong-wind condition. This paper suggests a experimental method to analyze performance of a radio wave and the aiming accuracy by wind vibration. And it analyzes the improvement and vibrational effect on a random-excitation of a structure caused by nonlinear strong wind.