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A Study of a Measurement Method to Obtain Waveforms of Pressure Variations Due to Train Passage
Title: A Study of a Measurement Method to Obtain Waveforms of Pressure Variations Due to Train Passage
Author: Katsuhiro KIKUCHI; Yasuo YOSHIDA; Masanobu IIDA; Akiyoshi YOSHIMURA (N/A)
Source: Transactions of the Japan Society of Mechanical Engineers Series C; ISSN:0387-5024; VOL.69; NO.685; PAGE.2271-2279; (2003)
Abstract: Low-frequency pressure variations observed at the time of train passage have been measured so far by a low-frequency sound level meter. The waveforms measured by this instrument are different from their original because of the influence of the frequency characteristic of the instrument. Therefore, it is desired to establish a method to grasp the original waveform of pressure variations. To obtain the original waveform, a method which restores the original waveform from the measured data obtained by the existing instrument is considered. To restore the original waveform, frequency characteristics of the low-frequency sound level meter is estimated through a frequency response function. The problem of restoring the original waveform is formulated as designing a digital inverse filter whose frequency characteristic corresponds to the inverse of that of measuring system. Through the application of the digital inverse filter to the data measured by the low-frequency sound level meter, effectiveness of the method to obtain original waveforms is verified.
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