کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10127509 | 1645056 | 2018 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Reproducibility of sound absorption and surface impedance of materials measured in a reverberation room using ensemble averaging technique with a pressure-velocity sensor and improved calibration
ترجمه فارسی عنوان
تکرار پذیری جذب صدا و امپدانس سطح مواد اندازه گیری شده در یک اتاق بازتابی با استفاده از تکنیک میانگین سازگاری با یک سنسور سرعت فشار و کالیبراسیون بهبود یافته
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کلمات کلیدی
کالیبراسیون، گروه میانگین، امپدانس، سنسور فشار سرعت، تکرارپذیری، جذب صدا،
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی مکانیک
چکیده انگلیسی
The authors have been developing a method using pressure-velocity sensors (pu-sensors) to measure the absorption coefficient and surface normal impedance of materials using ensemble averaging: EApu method. The improvement of geometrical configurations for pu-sensor calibration using an acoustic tube is presented first. Because no clear guideline for pu-sensor positioning in acoustic tube has been reported to date, such improvement is important. Moreover, it enables EApu method measurement to be conducted properly at frequencies region up to 3000â¯Hz. The tube has two openable hard end-walls that help us to make inside humidity conditions similar to those of the outside room and to realizing a one-dimensional sound field at calibration. With such improvements and with consideration of humidity, a round robin test using EApu method was conducted in three reverberation rooms to prove the reproducibility of measurements of absorption characteristics of glass-wool and needle felt. Results revealed excellent agreement of absorption coefficient values for reverberation rooms at frequencies of 100-3000â¯Hz. Results also demonstrated that the maximum difference of absorption coefficient values is less (almost equal or less than half) of those found in the authors' earlier study of the 125-1250â¯Hz frequency region.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Acoustics - Volume 142, 15 December 2018, Pages 87-94
Journal: Applied Acoustics - Volume 142, 15 December 2018, Pages 87-94
نویسندگان
Noriaki Sakamoto, Toru Otsuru, Reiji Tomiku, Saki Yamauchi,