The Journal of the INCE of Japan

The Journal of the INCE of Japan

Online ISSN : 1883-7506
Print ISSN : 0386-8761

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Volume 24, Issue 1

Displaying 1-16 of 16 articles from this issue

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Development of Sound Absorbing Materials

Masaru Koyasu

2000 Volume 24 Issue 1 Pages 3-4
Published: February 01, 2000
Released on J-STAGE: October 06, 2009

DOIhttps://doi.org/10.11372/souonseigyo1977.24.3

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Recent Sound Absorbing Materials

Hiromasa Ogawa

2000 Volume 24 Issue 1 Pages 5-8
Published: February 01, 2000
Released on J-STAGE: October 06, 2009

DOIhttps://doi.org/10.11372/souonseigyo1977.24.5

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Why is Paided Attention to New Type Materials?

Masazumi Shioda

2000 Volume 24 Issue 1 Pages 9-14
Published: February 01, 2000
Released on J-STAGE: October 06, 2009

DOIhttps://doi.org/10.11372/souonseigyo1977.24.9

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Sound Absorption Coefficient of Glass Wool in Hyperbaric Helium-Air Mixture in Saturation Dive

Hisayoshi Suzuki

2000 Volume 24 Issue 1 Pages 15-17
Published: February 01, 2000
Released on J-STAGE: October 06, 2009

DOIhttps://doi.org/10.11372/souonseigyo1977.24.15

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Weatherproof Sound Absorbing Materials

Yasuo Shimizu

2000 Volume 24 Issue 1 Pages 18-20
Published: February 01, 2000
Released on J-STAGE: October 06, 2009

DOIhttps://doi.org/10.11372/souonseigyo1977.24.18

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Noise Reduction of High Temperature Furnace by Ceramic Fiber

Hidenao Kawasaki

2000 Volume 24 Issue 1 Pages 21-24
Published: February 01, 2000
Released on J-STAGE: October 06, 2009

DOIhttps://doi.org/10.11372/souonseigyo1977.24.21

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Acoustic Absorber

Hiroshi Horii

2000 Volume 24 Issue 1 Pages 25-28
Published: February 01, 2000
Released on J-STAGE: October 06, 2009

DOIhttps://doi.org/10.11372/souonseigyo1977.24.25

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The Sound Absorbing System with Spraying Porous Mortar

Hitoshi Tanaka

2000 Volume 24 Issue 1 Pages 29-32
Published: February 01, 2000
Released on J-STAGE: October 06, 2009

DOIhttps://doi.org/10.11372/souonseigyo1977.24.29

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Sound Absorbing Materials from the Point of View of Human and Environment

Yasushi Shimada, Hirohito Yasuoka

2000 Volume 24 Issue 1 Pages 33-35
Published: February 01, 2000
Released on J-STAGE: October 06, 2009

DOIhttps://doi.org/10.11372/souonseigyo1977.24.33

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Sound-absorbing Materials by the Utilization of Flint Stone

Hiroharu Sasayama

2000 Volume 24 Issue 1 Pages 36-38
Published: February 01, 2000
Released on J-STAGE: October 06, 2009

DOIhttps://doi.org/10.11372/souonseigyo1977.24.36

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Application of Porous Concrete Made of Coal Ash for Noise Absorbing Material

Tsuyoshi Tanaka

2000 Volume 24 Issue 1 Pages 39-41
Published: February 01, 2000
Released on J-STAGE: October 06, 2009

DOIhttps://doi.org/10.11372/souonseigyo1977.24.39

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Sound Absorption Materials with a Waste Expanded Poli-Styrol

Yukinobu Yoshida, Hiromi Tsurukubo

2000 Volume 24 Issue 1 Pages 42-44
Published: February 01, 2000
Released on J-STAGE: October 06, 2009

DOIhttps://doi.org/10.11372/souonseigyo1977.24.42

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Recycle Sound Insulating Board Utilization of Waste Magnetic Tape

Hideyuki Kuroda

2000 Volume 24 Issue 1 Pages 45-47
Published: February 01, 2000
Released on J-STAGE: October 06, 2009

DOIhttps://doi.org/10.11372/souonseigyo1977.24.45

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Sound-absorbing Materials by the Utilization of Reclaimed Glass Bottles

Hiroharu Sasayama

2000 Volume 24 Issue 1 Pages 48-49
Published: February 01, 2000
Released on J-STAGE: October 06, 2009

DOIhttps://doi.org/10.11372/souonseigyo1977.24.48

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Study on Strategy of Multiple-Duct Active Silencer System

Minoru Takahashi, Kentaro Matsumoto, Ryusuke Gotohda, Hareo Hamada

2000 Volume 24 Issue 1 Pages 58-67
Published: February 01, 2000
Released on J-STAGE: October 06, 2009

DOIhttps://doi.org/10.11372/souonseigyo1977.24.58

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Large ventilation systems used in subways, underground substations, and other underground facilities have ducts of several meters square, and the noise caused by these systems has generated a need for active noise control that targets higher mode components in addition to plane waves. To this end, a multiple-duct active-silencer system can be considered in which multiple active silencers are installed along a cellular duct system, but degradation in noise reduction has been an issue in this system. We therefore performed a study on duct structure in the multiple-duct active-silencer system by analyzing sound fields inside ducts using the finite element method and by performing experiments with prototype equipment. To achieve noise reduction of 15dB, it was found that sound power of flowing sound from secondarily noise source among the multiple ducts must be suppressed by at least 18%. In this regard, an effective means of accomplishing this was found to be a duct extension on the downstream side where secondarily noise originates.

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Vehicle Noise Reduction Effect of Poro-Elastic Road Surface

Hirofumi Ohnishi, Seishi Meiarashi, Yoshiteru Nanri, Koichi Takagi

2000 Volume 24 Issue 1 Pages 68-76
Published: February 01, 2000
Released on J-STAGE: October 06, 2009

DOIhttps://doi.org/10.11372/souonseigyo1977.24.68

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We carried out some measurements of vehicle noise and a normal incidence absorption coefficient of the poro-elastic road surface (PERS), which was made of rubber granules obtained from wasted tires, and have obtained the following findings. We consider that PERS has a very large reduction effect on the vehicle noise. 1) PERS has very large noise reduction effects of about 16-19dB for passenger cars and about 6-10dB for heavy trucks at a speed of 40-120km/h. 2) PERS has a largenoise reduction effect in the frequency range less than 600Hz, where the drainage asphalt pavement has little reduction effect. This makes the noise reduction effect of PERS much larger than that of the drainage pavement. 3) The peak value of normal incidence absorption coefficient of PERS is about 0.9. It appears in the frequency range of 800-2, 000Hz, where the peak frequency differs from each other due to the thickness of PERS.

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