• Title, Summary, Keyword: Transmission Loss

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Influence of Internal Partition of Simple Extension Chamber on the Acoustic Transmission Loss (단순 확장 관 내부 파티션이 음향 투과손실에 미치는 영향해석)

  • Park, Jeong-Pil;Jeong, Weui-Bong;Ahn, Se-Jin
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.690-692
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    • 2014
  • To identify characterization of a simple extension chamber that have the two internal partition, produce the curve to estimate the transmission loss without the computer analysis. For helpful for internal optimum design, identify the characteristic of internal partition on transmission loss. Made estimated transmission loss curve by function of relationship of internal partition and transmission. Check the similarity of predicted transmission loss and analysis transmission loss. Usage of the predicted transmission loss made by relationship of internal partition and transmission loss is good information to place the internal partition so as to maximize the transmission loss on target frequency at optimal design on muffler.

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Transmission Loss Prediction of KHST′s Wall (KHST 차량 벽면의 투과손실값 예측)

  • Kim, Kwanju;Taejung Yoon
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.317.2-317
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    • 2002
  • Transmission loss of KHST passenger vehicle was calculated using measured acoustic data: In order to verify the transmission loss results for KHST case, similar experiment was carried out in laboratory condition, which result was compared those by geometric acoustic method. The computational results shows good agreement with the transmission loss magnitude from experiments. This paper also mentions items to obtain more accurate transmission loss values, i. e. how to assure reverberant field condition, the selection of source speaker' location.

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Assessment of Transmission Losses with The 7th Basic Plan of Long-term Electricity Supply and Demand (7차 전력수급계획에 따른 송전계통 손실 분석에 관한 연구)

  • Kim, Sung-Yul;Lee, Yeo-Jin
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.67 no.2
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    • pp.112-118
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    • 2018
  • In recent years, decentralized power have been increasing due to environmental problems, liberalization of electricity markets and technological developments. These changes have led to the evolution of power generation, transmission, and distribution into discrete sectors and the division of integrated power systems. Therefore, studies are underway to efficiently supply power and reduce losses to each sector's demand. This is a major concern for system planners and operators, as it accounts for a relatively high proportion of total power, with a transmission and distribution loss of 4-6%. Therefore, this paper analyzes the status of loss management based on the current transmission and distribution loss rate of each country and transmission loss management cases of each national power company, and proposes a loss rate prediction algorithm according to the long-term transmission system plan. The proposed algorithm predicts the demand-based long-term evolution and the loss rate of the grid to which the transmission plan is applied.

On-Line Economic Dispatch Algorithm including Transmission Loss (송전손실을 고려한 온라인 경제급전 알고리즘)

  • Jeon, D.H.;Kim, K.J.;Choi, J.H.;Jang, K.C.;Lim, J.H.;Lee, S.J.
    • Proceedings of the KIEE Conference
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    • pp.847-849
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    • 1998
  • In this paper, we propose the generalized on-line economic dispatch algorithm including transmission loss. it was derived from the process developing matrix form of the classic ELD problem. it can rapidly calculate generation power using transmission loss and transmission loss sensitivity calculated from the result of power flow analysis. Transmission loss sensitivity ${\partial}P_{loss}/{\partial}P_G$ is derived using optimization technique.

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Accurate Transmission Loss Allocation Algorithm Based on the Virtual Transaction Strategy: Comparison of Path-integral with Discrete Integral Methods

  • Min, Kyung-Il;Moon, Young-Hyun
    • Journal of Electrical Engineering and Technology
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    • v.5 no.4
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    • pp.511-521
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    • 2010
  • This paper presents a new algorithm to determine accurate bus-wise transmission loss allocation utilizing path-integrals dictated by the transaction strategy. For any transaction strategy, the total sum of the allocated transmission losses of all buses is equal to the actual loss given by the AC power-flow calculation considering the distributed slack. In this paper, the bus-wise allocation of the transmission loss is calculated by integrating the differential loss along a path determined by the transaction strategy. The proposed algorithm is also compared with Galiana's method, which is the well-known transmission loss allocation algorithm based on integration. The performance of the proposed algorithm is evaluated by case studies carried out on the WSCC 9-bus, IEEE 14-bus, New England 39-bus, and IEEE 118-bus systems. The simulation results show that the proposed algorithm is fast and accurate with a large step size.

Transmission Loss Characteristics of the Panel Type Silencer (패널형 소음기의 투과손실 특성 연구)

  • 서상현;김양한
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.178-183
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    • 2003
  • This paper deals with transmission loss characteristics of the panel type silencer to control low frequency noise. The panel type silencer is composed of many Helmholtz resonators by side branch. Each resonator has high transmission loss on the narrow band of its resonance frequency. Direct arrangement of the resonators increases mainly the magnitude of transmission loss. If we arrange the resonators in a row, the peak and band of transmission loss are increased. This makes the resonator array to have high transmission loss in the broader band. Using this idea, we design a silencer that has broader band characteristics and smaller volume.

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Tunneling Effect on Sound Transmission Loss Measurement (차음성능 계측시 터널링 효과에 관한 해석적 연구)

  • 김봉기;김재승;김현실;강현주;김상렬
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.1228-1233
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    • 2002
  • This study is aimed to evaluate a tunneling effect in association with the measurement of sound transmission loss. Based on the formulation for sound transmission loss of a finite panel in the presence of tunnel, variations of the sound transmission loss with parameters such as the location of panel and tunnel depth are investigated. It can be seen that differences in the sound transmission loss are quite evident below coincidence frequency and the sound transmission loss greatly depends on panel location in the tunnel. In comparison with the case without a tunnel, maximum difference occurs in the case where the panel is placed on the center of the tunnel and the flushing with the end of the tunnel gives the better estimation of transmission loss.

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Comparison Study of Sound Transmission Loss in High Speed Train

  • Kim, Tae-Min;Kim, Jeung-Tae
    • International Journal of Railway
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    • v.4 no.1
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    • pp.19-27
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    • 2011
  • Many studies for improving the railway vehicle's performance and comfort such as speed, weight and noise are currently in progress. Improving the structural characteristics of the vehicle for greater noise insulation is considered important for reducing disturbance due to noise, but measuring transmission loss entails large costs. This study explores an alternative method for estimating and measuring the railway vehicle's transmission loss that involves on applying the numerical analysis coupled with scaled reverberation chamber measurement. The transmission loss measurement using scaled reverberation chamber was performed after the compensation value was found through 1mm thickness(1t) specimen. For numerical analysis, a commercially available acoustics solver VA ONE was used. The proposed method is found to lead to transmission loss measurement comparable to the measurements based on large-scale reverberation chamber. Thus, it can be argued that a reliable method has been developed for measuring railway vehicle's transmission loss.

A Study on Tunneling Effect in Sound Transmission Loss Measurement (차음성능 측정시 터널링 효과에 관한 연구)

  • Kim, Bong-Ki;Kim, Jae-Seung;Kim, Hyun-Sil;Kang, Hyun-Ju;Kim, Sang-Ryul
    • The Journal of the Acoustical Society of Korea
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    • v.23 no.1E
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    • pp.24-30
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    • 2004
  • This study is aimed to evaluate a tunneling effect in the laboratory measurement of sound transmission loss. Based on the formulation for sound transmission loss of a finite panel in the presence of tunnel, variations of the sound transmission loss with the parameters of panel location and tunnel depth are investigated. In comparison with the transmission loss of a finite plate in an infinite rigid baffle, the maximum difference occurs in the laboratory measurement when the panel is placed at the center of the tunnel, while a better estimation of true transmission loss is obtained when the panel is located at either end.

An Experimental Study on Transmission Loss of Window (창호의 차음성능에 관한 실험적 연구)

  • 이성호;정갑철
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.241-246
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    • 2001
  • This study considered the transmission loss and frequency characteristecs of window, and examined the transmission loss for each type of windows to design an optimized window for blocking external noise. Moreover this has detect the transmission loss which depending on the thickness and the types(single and fair glass) of window as several major factors of transmission loss design. With this result, this study suggests a window design guide for much silent condition which is below the level of noise standard recommended.

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