Transmission Loss

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Jie Shi - One of the best experts on this subject based on the ideXlab platform.

  • Acoustic Parts in Vehicle Sound Transmission Loss Test Method Research
    Applied Mechanics and Materials, 2013
    Co-Authors: Xiu Feng Wang, Jie Shi
    Abstract:

    The sound Transmission Loss (STL) of the acoustic parts in the vehicle was proposed to be computed using the Sound Pressure Level measured at the several locations inside the vehicle and the transmitted Sound Intensity Level on the vehicles exterior panel, which the acoustic treated vehicle passenger compartment is assumed as a small reverberation room. The necessary parts retrofits and acoustic treatments for Sound Transmission Loss tests of the acoustic parts in the vehicle were listed. The values of the appropriate number and positions of the loud speakers, microphones and sound intensity probes for Sound Transmission Loss of the acoustic parts in the vehicle were recommended. The in vehicle sound Transmission Loss tests of the acoustic parts such as the doors, carpets, wheel house etc. were achieved in the semi-anechoic room. Based on the door system, the correlation work has been done among the methods of the proposed in vehicle STL test, the reverberation - semi-anechoic chamber buck STL test and SEA analysis.

  • Research of Acoustic Parts in Vehicle Sound Transmission Loss Test Method
    Lecture Notes in Electrical Engineering, 2012
    Co-Authors: Xiu Feng Wang, Jie Shi
    Abstract:

    The sound Transmission Loss (STL) of the acoustic parts in the vehicle was proposed to be computed using the Sound Pressure Level measured at the several locations inside the vehicle and the transmitted Sound Intensity Level on the vehicle’s exterior panel, which the acoustic treated vehicle passenger compartment is assumed as a small reverberation room. The necessary parts retrofits and acoustic treatments for Sound Transmission Loss tests of the acoustic parts in the vehicle were listed. The values of the appropriate number and positions of the loud speakers, microphones and sound intensity probes for Sound Transmission Loss of the acoustic parts in the vehicle were recommended. The in vehicle sound Transmission Loss tests of the acoustic parts such as the doors, carpets, wheel house etc. were achieved in the semi-anechoic room. Based on the door system, the correlation work has been done among the methods of the proposed in vehicle STL test, the reverberation—semi-anechoic chamber buck STL test and SEA analysis.

Zhen-wei Zhao - One of the best experts on this subject based on the ideXlab platform.

  • Study on the Prediction of Troposcatter Transmission Loss
    IEEE Transactions on Antennas and Propagation, 2016
    Co-Authors: Leke Lin, Rui Zhang, Zhen-wei Zhao
    Abstract:

    In this article, a novel semiempirical average annual troposcatter Transmission Loss prediction model is presented. The model is generated by optimizing the correlation coefficients of propagation path conditions utilizing the modern optimization algorithm. The statistical relativities of troposcatter Transmission Loss as captured by changing frequency, path length, scatter angle, and meteorological condition are each analyzed using the terrestrial trans-horizon propagation Loss data banks released by the International Telecommunication Union (ITU). For the percentages of time Transmission Loss not falling below 50%, the model is combined with the model of anomalous propagation mechanism introduced in the Recommendation ITU-R P.2001. The prediction results of this new troposcatter model are compared with other troposcatter models and with the trans-horizon propagation Loss data banks. The comparisons show that the new model has a better estimated accuracy.

Xiu Feng Wang - One of the best experts on this subject based on the ideXlab platform.

  • Acoustic Parts in Vehicle Sound Transmission Loss Test Method Research
    Applied Mechanics and Materials, 2013
    Co-Authors: Xiu Feng Wang, Jie Shi
    Abstract:

    The sound Transmission Loss (STL) of the acoustic parts in the vehicle was proposed to be computed using the Sound Pressure Level measured at the several locations inside the vehicle and the transmitted Sound Intensity Level on the vehicles exterior panel, which the acoustic treated vehicle passenger compartment is assumed as a small reverberation room. The necessary parts retrofits and acoustic treatments for Sound Transmission Loss tests of the acoustic parts in the vehicle were listed. The values of the appropriate number and positions of the loud speakers, microphones and sound intensity probes for Sound Transmission Loss of the acoustic parts in the vehicle were recommended. The in vehicle sound Transmission Loss tests of the acoustic parts such as the doors, carpets, wheel house etc. were achieved in the semi-anechoic room. Based on the door system, the correlation work has been done among the methods of the proposed in vehicle STL test, the reverberation - semi-anechoic chamber buck STL test and SEA analysis.

  • Research of Acoustic Parts in Vehicle Sound Transmission Loss Test Method
    Lecture Notes in Electrical Engineering, 2012
    Co-Authors: Xiu Feng Wang, Jie Shi
    Abstract:

    The sound Transmission Loss (STL) of the acoustic parts in the vehicle was proposed to be computed using the Sound Pressure Level measured at the several locations inside the vehicle and the transmitted Sound Intensity Level on the vehicle’s exterior panel, which the acoustic treated vehicle passenger compartment is assumed as a small reverberation room. The necessary parts retrofits and acoustic treatments for Sound Transmission Loss tests of the acoustic parts in the vehicle were listed. The values of the appropriate number and positions of the loud speakers, microphones and sound intensity probes for Sound Transmission Loss of the acoustic parts in the vehicle were recommended. The in vehicle sound Transmission Loss tests of the acoustic parts such as the doors, carpets, wheel house etc. were achieved in the semi-anechoic room. Based on the door system, the correlation work has been done among the methods of the proposed in vehicle STL test, the reverberation—semi-anechoic chamber buck STL test and SEA analysis.

J. Adin Mann - One of the best experts on this subject based on the ideXlab platform.

  • Comparison of models for piping Transmission Loss estimations
    The Journal of the Acoustical Society of America, 2005
    Co-Authors: Fred W. Catron, J. Adin Mann
    Abstract:

    A frequency dependent model for the Transmission Loss of piping is important for accurate estimates of the external radiation from pipes and the vibration level of the pipe walls. A statistical energy analysis model is used to predict the Transmission Loss of piping. Key terms in the model are the modal density and the radiation efficiency of the piping wall. Several available models for each are compared in reference to measured data. In low frequency octave bands, the modal density is low. The model of the Transmission Loss in these octave bands is augmented with a mass law model in the low frequency regime where the number of modes is small. The different models and a comparison of the models will be presented.

  • Comparison of Models for Piping Transmission Loss Measurements
    2005
    Co-Authors: Fred W. Catron, J. Adin Mann
    Abstract:

    A frequency dependent model for the Transmission Loss of piping is important for accurate estimates of the external radiation from pipes and the vibration level of the pipe walls. A statistical energy analysis model is used to predict the Transmission Loss of piping. Key terms in the model are the modal density and the radiation efficiency of the piping wall. Several available models for each are compared in reference to measured data. In low frequency octave bands, the modal density is low. The model of the Transmission Loss in these octave bands is augmented with a mass law model in the low frequency regime where the number of modes is small. The different models and a comparison of the models will be presented.

  • Piping noise Transmission Loss calculations using finite element analysis
    The Journal of the Acoustical Society of America, 2005
    Co-Authors: Richard Eberhart, Fred W. Catron, Allen C. Fagerlund, Denis G. Karczub, J. Adin Mann
    Abstract:

    The prediction of noise radiated by piping downstream of a control valve is subject to various uncertainties. One of the significant sources of uncertainty is the pipe‐wall Transmission Loss. Due to the difficulties in experimentally measuring pipe‐wall Transmission Loss accurately, and practical difficulties of taking into account pipe length and boundary conditions, an analytical approach for the calculation of Transmission Loss is required. The feasibility of uncoupled structural‐acoustic finite element based calculations of Transmission Loss is being investigated for this purpose. By developing the use of finite element based calculations of Transmission Loss, it is hoped to provide a simple analysis procedure to quantify the effects of pipe length and boundary conditions on the noise level downstream of control valves in practical piping systems. It should also assist in the refinement of analytical/statistical calculations of Transmission Loss and noise radiation.

Leke Lin - One of the best experts on this subject based on the ideXlab platform.

  • Study on the Prediction of Troposcatter Transmission Loss
    IEEE Transactions on Antennas and Propagation, 2016
    Co-Authors: Leke Lin, Rui Zhang, Zhen-wei Zhao
    Abstract:

    In this article, a novel semiempirical average annual troposcatter Transmission Loss prediction model is presented. The model is generated by optimizing the correlation coefficients of propagation path conditions utilizing the modern optimization algorithm. The statistical relativities of troposcatter Transmission Loss as captured by changing frequency, path length, scatter angle, and meteorological condition are each analyzed using the terrestrial trans-horizon propagation Loss data banks released by the International Telecommunication Union (ITU). For the percentages of time Transmission Loss not falling below 50%, the model is combined with the model of anomalous propagation mechanism introduced in the Recommendation ITU-R P.2001. The prediction results of this new troposcatter model are compared with other troposcatter models and with the trans-horizon propagation Loss data banks. The comparisons show that the new model has a better estimated accuracy.