翻訳と辞書 Words near each other ・ High-speed steam engine ・ High-speed steel ・ High-speed telegraphy ・ High-speed transceiver logic ・ High-speed transport ・ High-Speed Uplink Packet Access ・ High-spined commensal hydroid ・ High-spired elimia ・ High-stakes testing ・ High-sticking ・ High-strength low-alloy steel ・ High-tech architecture ・ High-floor ・ High-Flux Advanced Neutron Application Reactor ・ High-frequency direction finding ・ High-Frequency Impulse-Measurement ・ High-frequency trading ・ High-frequency ventilation ・ High-frequency vibrating screens ・ High-functioning alcoholic ・ High-functioning autism ・ High-G training ・ High-grade prostatic intraepithelial neoplasia ・ High-hat triplefin ・ High-heeled footwear ・ High-integrity pressure protection system ・ High-intensity discharge lamp ・ High-intensity focused ultrasound ・ High-intensity interval training ・ High-intensity magnetic separator Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク High-Frequency Impulse-Measurement ： ウィキペディア英語版 High-Frequency Impulse-Measurement HFIM, acronym for high-frequency-impulse-measurement, is a certain kind of measurement technique in acoustics, where structure-borne sound signals are detected and processed with certain emphasis on short-lived signals as they are indicative for crack formation in a solid body, mostly steel. The basic idea is to use mathematical signal processing methods such as Fourier analysis in combination with suitable computer hardware to allow for real-time measurements of acoustic signal amplitudes as well as their distribution in frequency space. The main benefit of this technique is the enhanced signal-to-noise ratio when it comes to the separation of acoustic emission from a certain source and other, unwanted contamination by any kinds of noise. The technique is therefore mostly applied in industrial production processes, e.g. cold forming or machining, where a 100 percent quality control is required or in condition monitoring for e.g. quantifying tool wear. == Physical basics == High-frequency-impulse measurement is an algorithm for obtaining frequency information of any structure- or air-borne sound source on the basis of discrete signal transformations. This is mostly done utilizing (series ) to quantify the distribution of the energy content of a sound signal in frequency space. On the software side, the tool used for this is the Fast Fourier transform (FFT) implementation of this mathematical transformation. This allows, in combination with specific hardware, to directly obtain frequency information so that this is accessible in-line, e.g. during a production process. Contrary to classical, off-line frequency analysis methods, the signal is not unfolded prior to transformation but is directly fed into the FFT computation. Single events, such as cracks, are hence depicted as extremely short-lived signals covering the entire frequency range (the Fourier transform of a single impulse is a signal covering the entire observed frequency space). Therefore, such single events are easily separable from other noises, even if they are much more energetic. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「High-Frequency Impulse-Measurement」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.