• Title/Summary/Keyword: Transmission Angle

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Sound Transmission Loss of Double Panels(I) : A Double Wall with Air Cavity (이중판의 차음손실 I)

  • 강현주;김현실;김재승;김상렬
    • Journal of KSNVE
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    • v.7 no.6
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    • pp.945-952
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    • 1997
  • This paper shows the feasibility of the suggestion that the angle distribution of incident sound to panels might be gaussian, instead of the conventional uniform distribution in the analysis of transmission loss of panels. To prove the suggestion, the problems with the diffuse sound field in a reverberation room are examined by case studies and the comparision of the prediction with the measurement of sound transmission loss of walls are performed. The results of the comparision show good agreement between the two values.

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A Study of the Slim Design of Overhead Transmission Tower (가공송전철탑 경량화 설계에 관한 연구)

  • Lee, Jung-Won;Lee, Won-Kyo
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.23 no.7
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    • pp.560-565
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    • 2010
  • This paper presents the design factor of an overhead transmission tower structure in order to reduce the tower weight. The behaviour of transmission tower structures are affected by the horizontal angle of the tower structure, the equivalent wind pressure group, the slope of the main post of the tower, the separation of the internode and the use of high-strength materials in their construction. Tower weight can be reduced by approximately 30% reduce weight by means of optimal design based on a consideration of all the above factors. In addition, the design of the foundation of the tower with the shear key installation to increase horizontal support together with a modified angle of inclination to the ground can reduce by about 37% the amount of concrete used during construction. The area of ground disturbed by the construction of the tower foundation can thus be reduced by approximately 33%. Therefore it is possible to build an environmently-friendly T/L tower with the mechanical properties of existing towers.

A Study on the Measurement and Analysis Method for the Acoustic Transmission Loss of the Material for the Acoustic Window of Sonar Dome (소나 돔 음향창 시편 투과손실 측정/분석 방법 고찰)

  • Jung, Woo-Jin;Han, Seung-Jin;Kim, Won-Ho;Shin, Ku-Kyun;Jeon, Jae-Jin
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.16 no.7 s.112
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    • pp.729-738
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    • 2006
  • Knowledge of acoustic transmission loss of acoustic window material has a great importance for the sonar performance in ship. The purpose of this study was to investigate the measurement and analysis method for the acoustic transmission loss of the acoustic window materials for sonar dome. The measurement and analysis were carried out in water with GRP material. Transmission losses were calculated based on integrated direct and transmitted signals. The experimental setup enabled to vary the angle of incidence. Thus the transmission loss data could be expressed as the function of frequency and angle of rotation. In this paper, diffraction effect of incident angle, size of specimen with test material, transmission analysis method and multiple waves as incident acoustic signal were discussed.

A Study on the Measurement and Analysis Method for the Acoustic Transmission Loss of the Material for the Acoustic Window of Sonar Dome (소나 돔 음향창 시편 투과손실 측정/분석 방법 고찰)

  • Jung, Woo-Jin;Han, Seung-Jin;Kim, Won-Ho;Shin, Ku-Kyun;Jeon, Jae-Jin
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2006.05a
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    • pp.1183-1189
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    • 2006
  • Knowledge of acoustic transmission loss of acoustic window material has a great Importance for the sonar performance in ship. The purpose of This study was to investigate the measurement and analysis method for me acoustic transmission loss of the acoustic window materials for sonar dome. The measurement and analysis were carried out in water with GRP material. Transmission losses were calculated based on integrated direct and transmitted signals. The experimental setup enabled to vary the angle of incidence. Thus the transmission loss data could be expressed as the function of frequency and angle of rotation. In this paper, diffraction effect of incident angle, size of specimen with test material, transmission analysis method and multiple waves as incident acoustic signal wet-e discussed

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A Study on the Dynamic Behaviors of Toroidal Infinitely Variable Transmission (토로이달 무단변속기 동적 거동에 관한 연구)

  • Jang Siyoul;Choi Wan
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • 2003.11a
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    • pp.348-354
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    • 2003
  • An analysis of the dynamic behavior between disk and roller has been performed when the torque is transmitted to toroidal IVT (Infinitely Variable Transmission). The contact area, shape and pressure with elliptical shapes between disk and roller are computed as the transmission ratios are changed. This study will give the information of contact shapes between roller-input dist and roller-output disk which are working under the most severe condition. The computed results are expected to guide the design criteria for the enhanced endurance li(e. Furthermore, the investigation of contact behaviors is very crucial to develop the traction oil that the efficiency of IVT system is most dependent on.

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Spectral Characteristics of 50 GHz FSR Etalon for Wide-band DWDM Application

  • Kim, Jong-Deog;Moon, Jong-Tae
    • Journal of the Optical Society of Korea
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    • v.8 no.3
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    • pp.104-107
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    • 2004
  • The periodic transmission spectrum of a solid etalon for wide-band capability is analyzed both theoretically and experimentally. In the transmission spectrum with an incident area of a photodetector, the peak wavelength and transmittance are deeply dependent on the incident angle and the divergence angle of the input laser beam. A thermal adjustment for a solid etalon is an optional way to control the transmission spectrum instead of the inefficient fine-angle alignment. In the result, we present the deviations of free spectral range (FSR) by the change in angle and temperature over wide wavelength range.

Power Flow Control of Thyristor Controlled Shunt Compensator (싸이리스터 제어 병렬 보상기에 의한 전력 제어 연구)

  • 정교범
    • Proceedings of the KIPE Conference
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    • 1999.07a
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    • pp.680-683
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    • 1999
  • A thyristor controlled shunt compensator, which is installed in the middle of the transmission line is adopted for controlling real power flow in a simple power transmission system. By means on the Fourier series representation of the thyristor switching action and the system parameters, the thyristor current equations are derived, which transmit the required real power of the simple power transmission system and inform the thyristor firing angle, the thyristor conduction angle, the power flows and the harmonic characteristics EMTP simulations at the various operating points show the dynamic characteristics of the thyristor controlled shunt compensator and correspond to the results calculated with the Fourier series representation.

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Energy Transmission of Elastic Waves in Ultrasonic Transducers (초음파 트랜스듀서의 탄성파 에너지 투과율)

  • Piao, Chunguang;Kim, Dae Jong;Kim, Jin Oh
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.25 no.2
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    • pp.124-132
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    • 2015
  • The paper deals with the energy transmission of the elastic waves obliquely transmitting and refracting through a plate and a pipe. By calculating the transmitting ratio depending on the incidence angle, the angle corresponding to the maximum transmission was determined theoretically and considered in the design of ultrasonic transducers for flow velocimetry. Experiments were carried out by using prototypes of the transducers. Experimentally-obtained transmission ratios were compared with and confirmed the theoretically-calculated results.

Coupling of External Electromagnetic Fields to the Nonuniform Transmission Line Consisting of Two Angled Wires (각진 두 도선으로 구성된 비균일 전송선의 외부 전자파 결합)

  • 홍성용;김세윤;나정웅
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.7 no.2
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    • pp.95-104
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    • 1996
  • The effects of involved parameters to the voltages induced at both ends of an angled two-wire transmission line are investigated for the incidence of an arbitrary plane wave. The minimum level of the induced voltages is found in case that both ends of the transmission line are terminated by the ma- tching loads and the azimuth angle of the incident wave is equal to the elevation angle. A graphical technique is also developed to estimate the induced voltages at the change of the wire radius or tilt angle between two wires.

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Shock-Absorbing Safety Mechanism Based on Transmission Angle of a 4-Bar Linkage (4절링크의 전달각에 기초한 충격흡수식 안전기구)

  • Park, Jung-Jun;Kim, Byeong-Sang;Song, Jae-Bok
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.29 no.11 s.242
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    • pp.1534-1541
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    • 2005
  • Unlike industrial manipulators, the manipulators mounted on service robots are interacting with humans in various aspects. Therefore, safety has been one of the most important design issues. Many compliant robot arms have been introduced for safety. It is known that passive compliance method has faster response and higher reliability than active ones. In this paper, a new safety mechanism based on passive compliance is proposed. Passive mechanical elements, specifically transmission angle of the 4-bar linkage, springs and shock absorbing modules are incorporated into this safety mechanism. This mechanism works only when the robot arm exerts contact force much more than the human pain tolerance. Validity of this mechanism is verified by simulations and experiments. It is shown that the manipulator using this mechanism provides higher performance and safety than those using other passive compliance mechanisms or active methods.