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Article | 01-April-2018

Estimation Algorithm for Low Frequency Seismic Motions Based on Extended Semblance Function

Monitoring low frequency and long period ground motions is very important for earthquake detection and alarm systems, and signal processing techniques help to investigate the mechanism of deep ground motions and earthquake occurrence by detecting effective seismic information from the seismograms. In this paper a frequency domain algorithm is presented to estimate the travel time difference of seismic waves with multi-path interferences caused by the refraction effect. The spectra of the

Lianming Sun

International Journal of Advanced Network, Monitoring and Controls, Volume 1 , ISSUE 1, –

Article | 01-December-2015

DISCRETE S-TRANSFORM BASED SPEECH ENHANCEMENT

S-transform (ST) is an effective time-frequency representation method with the advantages of short-time Fourier transform and wavelet transform. This paper utilizes the advantages of the power spectral subtraction method and the speech enhancement method to presents a novel speech enhancement algorithm based on discrete ST. Firstly, the speech in time domain is transformed by ST to joint time-frequency domain for spectral subtraction so that the clear speech spectrum can be obtained and then

Guo-hua Hu, Rui Li, Liang Tao

International Journal on Smart Sensing and Intelligent Systems, Volume 8 , ISSUE 4, 2231–2246

research-article | 30-November-2020

Improving sand flow rate measurement using the wavelet transform and ultrasonic sensors

Transform (STFT) to analyse the signal from acoustic sensors. STFT is an extension of the Fourier Transform for non-stationary signals (those signals which change characteristics over time). STFT converts a signal from the time domain to the time-frequency domain. The Wavelet Transform is a superior method for analysing non-stationary signals and is used in various applications such as image processing, data compression, de-noising, etc. (Shukla, 2013). Similar to the STFT, this method uses the time

H. Seraj*, B. Evans, M. Sarmadivaleh

International Journal on Smart Sensing and Intelligent Systems, Volume 14 , ISSUE 1, 1–13

Article | 03-November-2017

SINGLE SH-SAW SENSOR AS A DISTRIBUTED SENSOR ARRAY FOR LIQUIDS RECOGNITION

Basic possibility to use single-channel shear-horizontal surface acoustic waves sensor constructed as a delay line on multilayered structure with 36О YX LiTaO3 substrate for liquids recognition has been proposed. The changes under analytes influence of the sensor pulse responses obtained by transformation to time domain of one of the S-parameters measured in frequency domain have been used as sensor responses. Examples of responses to some liquid analytes have been demonstrated for a sensor

R. G. Kryshtal, A.V. Medved

International Journal on Smart Sensing and Intelligent Systems, Volume 2 , ISSUE 4, 602–611

Article | 05-June-2013

ANALYSIS AND EXPERIMENTAL STUDY OF OPTIMAL SOIL MOISTURE SENSOR PROBE LENGTH

two parallel needle moisture sensors has been widely used in Soil moisture detection equipment, for example, frequency domain (FD), time domain reflectometry (TDR) and standing wave ratio (SWR) measurement. The design of probe‘s port impedance is key technology parameters to soil moisture sensor. In this study, according to the relationships between the length and impedance characteristics of terminal open and closed state probe were presented based on two-pin probe structure of parallel

Zhao Yandong, Nie Mingjun

International Journal on Smart Sensing and Intelligent Systems, Volume 6 , ISSUE 3, 849–866

Article | 05-September-2013

THE VIBRATION AND MEASUREMENT OF DRIVING MODE OF THE TWO-STAGE DECOUPLED MICRO-MACHINED GYROSCOPE

damping coefficient in time domain and frequency domain respectively using this method. The comparison to the theoretical solution proves that the method is effective and accurate; it will help the study for the micro-machined gyroscope vibration and provides a new way to measure MEMS.

Yao Fenglin, Gao Shiqiao, Zhao Jie, Liu Haipeng, Niu Shaohua, Jin Lei

International Journal on Smart Sensing and Intelligent Systems, Volume 6 , ISSUE 4, 1599–1616

Article | 01-December-2016

CREDIBILITY EVALUATION FOR BLIND PROCESSING RESULTS OF BPSK SIGNALS BY USING PHASE SPECTRAL ENTROPY

A credibility test method based on the features of frequency domain entropy of a phase is proposed to evaluate the blind processing results of a BPSK signal. Initially, a reference signal was constructed depending on the certain identified modulation results. By analyzing the differences of the phase of the correlation series between the observed signal and the reference signal, a reliability test problem for the BPSK signal is performed by calculating the phase spectrum entropy and comparing

Wang Shuwang, Hu Guobing

International Journal on Smart Sensing and Intelligent Systems, Volume 9 , ISSUE 4, 1900–1917

Article | 01-June-2012

PRACTICAL SWAY MOTION CONTROL FOR DOUBLE PENDULUM-TYPE OVERHEAD CRANE SYSTEM

input shapers with the derivative effects are designed based on the properties of the system. The response DPTOC system to shaped input is experimentally verified in time and frequency domain. The performance of the input shaper is examined in terms of sway angle reduction and time response specification. Experimental results demonstrate the effectiveness of the proposed approach in reducing the sway motion of crane system.

M. N. A. Zohari, M. Z. Mohd Tumari, M. S. Saealal, K.H. Ghazali, M.S. Ramli

International Journal on Smart Sensing and Intelligent Systems, Volume 5 , ISSUE 2, 362–381

Article | 01-September-2012

AN APPROPRIATE PROCEDURE FOR DETECTION OF JOURNAL-BEARING FAULT USING POWER SPECTRAL DENSITY, K-NEAREST NEIGHBOR AND SUPPORT VECTOR MACHINE

Journal-bearings play a significant role in industrial applications and the necessity of condition monitoring with nondestructive tests is increasing. This paper deals a proper fault detection technique based on power spectral density (PSD) of vibration signals in combination with K-Nearest Neighbor and Support Vector Machine (SVM). The frequency domain vibration signals of an internal combustion engine with three journal-bearing conditions were gained, corresponding to, (i) normal, (ii

A. Moosavian, H. Ahmadi, A. Tabatabaeefar, B. Sakhaei

International Journal on Smart Sensing and Intelligent Systems, Volume 5 , ISSUE 3, 685–700

Article | 01-September-2014

EMPIRICAL MODE DECOMPOSITION AND ROUGH SET ATTRIBUTE REDUCTION FOR ULTRASONIC FLAW SIGNAL CLASSIFICATION

Feature extraction and selection are the most important techniques for ultrasonic flaw signal classification. In this study, empirical mode decomposition (EMD) is first used to obtain the intrinsic mode functions (IMFs) of original ultrasonic signals. Such IMFs and traditional time as well as frequency domain based statistical parameters are extracted as the initial features of flaw signal. After that, spectral clustering method is used for feature value discretization so that rough set

Yu Wang

International Journal on Smart Sensing and Intelligent Systems, Volume 7 , ISSUE 3, 1401–1420

Research Article | 15-February-2020

Numerical analysis of ultrasonic guided waves propagation in highly attenuative viscoelastic material

The propagation of ultrasonic guided waves in viscoelastic isotropic material has been investigated. Based on the plane theory, a numerical model of the guided waves propagating is developed in the frequency domain by employing the SFEM (spectral finite element method). To verify the proposed method, thin bitumen on the steel substrate is examined and compared with the single plate in terms of the dispersion and attenuation. From the dispersion and attenuation of the displacement curves, the

Li Hong, Wang Qingfeng

International Journal on Smart Sensing and Intelligent Systems, Volume 7 , ISSUE 5, 1–6

Research Article | 13-December-2017

A BROADBAND SPECTROSCOPIC SENSOR PROBE

. Although the probe is capable of a very wide frequency range, separate instruments are generally required, and here we focus on measurements above 1MHz. We demonstrate measurements in the frequency domain using a vector network analyser, and in the time domain using a broadband oscilloscope. For switching, we employed a coaxial switch and demonstrate how that is included within the instrument calibration. Calibration of the probe used three references: an open circuit, short circuit (indium foil) and a

I M Woodhead, I Platt, J H Christie, S Krenek

International Journal on Smart Sensing and Intelligent Systems, Volume 1 , ISSUE 2, 459–469

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