探討地聲訊號與粒徑之關係

謝易儒

doi:10.6342/NTU201803919

44.192.94.86，Hello！

Close
Search Quick Search Advanced Search Publication Search	Personal Service Member Login Searching History Use Bonus Card SYMSKAN
Browse Browse by University of Graduate Thesis Browse by Pinyin of Graduate Thesis Browse by Conference Proceedings Topic Browse by Conference Proceedings Publisher Browse by Pinyin of Conference Proceedings Browse by eBook Category Browse by eBook Topic Browse by eBook Publisher
Customer Services Authorize Airiti Recommend a Journal

Search Symbol (Half-width)	Description of Search Symbols
Space	"AND" indicates the intertwining of key terms used in a search
Double Quotation Marks ("") ( " " )	Double quotation marks indicate the beginning and end of a phrase, and the search will only include terms that appear in the same order of those within the quotations. Example: "image process" ： " image process "
?	Indicates a variable letter. Entering two ? will indicate two variable letters, and so on. Example: "Appl?", search results will yield apple, apply… e , appl y … ( (often used to English word searches) )
*	Indicates an unlimited number of variable letters to follow, from 1~n. Example: Enter "appl*", search results will yield apple, apples, apply, applied, application…(often used in English word searches) e , appl es , appl y , appl ied , appl ication … ( (often used to English word searches) )
AND、OR、NOT	Boolean logic combinations of key words is a skill used to expand or refine search parameters. (1) AND (1) AND: Refines search parameters (2) OR (2) OR: Expands search parameters (3) NOT: Excludes irrelevant parameters

DOI stands for Digital Object Identifier （ D igital O bject I dentifier ） ,
and is the unique identifier for objects on the internet. It can be used to create persistent link and to cite articles.

Using DOI as a persistent link

To create a persistent link, add「http://dx.doi.org/」「 http://dx.doi.org/ 」 before a DOI.
For instance, if the DOI of an article is 10.5297/ser.1201.002 , you can link persistently to the article by entering the following link in your browser: http://dx.doi.org/ 10.5297/ser.1201.002 。
The DOI link will always direct you to the most updated article page no matter how the publisher changes the document's position, avoiding errors when engaging in important research.

Cite a document with DOI

When citing references, you should also cite the DOI if the article has one. If your citation guideline does not include DOIs, you may cite the DOI link.

DOIs allow accurate citations, improve academic contents connections, and allow users to gain better experience across different platforms. Currently, there are more than 70 million DOIs registered for academic contents. If you want to understand more about DOI, please visit airiti DOI Registration （ doi.airiti.com ）。

Data Source

College of Engineering > Graduate Institute of Civil Engineering
Engineering > Civil Engineering & Architecture Engineering

Bibliography Management Tool

Related Links

Report an Issue

Purchase Single Articles

Download PDF

探討地聲訊號與粒徑之關係

Exploring the Relationship between Geosonic Signals and Grain Size

謝易儒 , Masters　　Advisor：劉格非　　

繁體中文 DOI： 10.6342/NTU201803919

粒徑；地聲探測器；次聲麥克風；頻譜分析；快速傅立葉轉換； grain size ； geophone ； infrasound microphone ； spectrum analysis ； fast Fourier transform

Abstract │ Reference (15) │ Altmetrics

Abstract 〈TOP〉

Parallel Abstract 〈TOP〉

In this study, we use geophones to investigate the vibration signals generated by the collision of different sizes of dry gravel in the laboratory. Afterwards, we use the fast Fourier transform (FFT) to analyze the vibration signals. Then we take the average value of the spectrum energy as the threshold, and regard the frequency band higher than the threshold as the characteristic frequency. We found that it will generate a wide-band frequency signal along the direction of the collision, and generate a low-frequency signal in the vertical direction of the collision. The energy of the low-frequency signal will change significantly with different collision points.
Besides the geophones, we also use infrasound microphone to investigate the sound wave signal propagating in the air. Then we compare the spectrum of the microphone with the spectrum of the geophone, and find that the spectrum of two different system is similar only between 80~120Hz. If we install the infrasound microphone underground, the spectrum of the microphone will be much similar to the spectrum of the geophone.

Reference ( 15 ) 〈TOP〉

[1] Richards, K. S., & Milne, L. M. (1979). “Problems in the calibration of an acoustic device for the observation of bedload transport”
[2] Bogen, J., & Møen, K. (2003). “Bed load measurements with a new passive ultrasonic sensor”
[3] Rickenmann, D., & McArdell, B. W. (2007). “Continuous measurement of sediment transport in the Erlenbach stream using piezoelectric bedload impact sensors”
[4] Wyss, C. R., Rickenmann, D., Fritschi, B., Turowski, J. M., Weitbrecht, V., & Boes, R. M. (2016). “Laboratory flume experiments with the Swiss plate geophone bed load monitoring system: 1. Impulse counts and particle size identification”
[5] Taniguchi, S., Itakura, Y., Miyamoto, K., & Kurihara, J. (1992). “A new acoustic sensor for sediment discharge measurement”

Altmetrics

〈TOP〉

E-mail ：

When an article is available to download, a notice will be sent to your mailbox address.

E-mail ：