scholarly journals Acoustic-Based Position Estimation of an Object and a Person Using Active Localization and Sound Field Analysis

2020 ◽  
Vol 10 (24) ◽  
pp. 9090
Author(s):  
Kihyun Kim ◽  
Semyung Wang ◽  
Homin Ryu ◽  
Sung Q. Lee
Keyword(s):  
Angular Position ◽  
Sound Field ◽  
Position Estimation ◽  
Field Analysis ◽  
Fdtd Simulation ◽  
Field Variation ◽  
Security Systems ◽  
Control Zone ◽  
Home Security ◽  
Active Localization

This paper proposes a new method to estimate the position of an object and a silent person with a home security system using a loudspeaker and an array of microphones. The conventional acoustic-based security systems have been developed to detect intruders and estimate the direction of intruders who generate noise. However, there is a need for a method to estimate the distance and angular position of a silent intruder for interoperation with the conventional security sensors, thus overcoming the disadvantage of acoustic-based home security systems, which operate only when sound is generated. Therefore, an active localization method is proposed to estimate the direction and distance of a silent person by actively detecting the sound field variation measured by the microphone array after playing the sound source in the control zone. To implement the idea of the proposed method, two main aspects were studied. Firstly, a signal processing method that estimates the position of a person by the reflected sound, and secondly, the environment in which the proposed method can be operated through a finite-difference time-domain (FDTD) simulation and the acoustic parameters of early decay time (EDT) and reverberation time (RT20). Consequently, we verified that with the proposed method it is possible to estimate the position of a polyvinyl chloride (PVC) pipe and a person by using their reflection in a classroom.

A new reaching law for sliding mode observer of controllable excitation linear synchronous motor

2021 ◽  
pp. 014233122110320
Author(s):  
Xiaolei Shi ◽  
Yipeng Lan ◽  
Yunpeng Sun ◽  
Cheng Lei
Keyword(s):  
Sliding Mode ◽  
Dynamic Performance ◽  
Angular Position ◽  
Lyapunov Stability Theory ◽  
Synchronous Motor ◽  
Position Estimation ◽  
Sliding Mode Observer ◽  
Sigmoid Function ◽  
Reaching Law ◽  
Linear Synchronous Motor

This paper presents a sliding mode observer (SMO) with new reaching law (NRL) for observing the real-time linear speed of a controllable excitation linear synchronous motor (CELSM). For the purpose of balancing the dilemma between the rapidity requirement of dynamic performance and the chattering reduction on sliding mode surface, the proposed SMO with NRL optimizes the reaching way of the conventional constant rate reaching law (CRRL) to the sliding mode surface by connecting the reaching process with system states and the sliding mode surface. The NRL is based on sigmoid function and power function, with proper options of exponential term and power term, the NRL is capable of eliminating the effect of chattering on accuracy of the angular position estimation and speed estimation. Compared with conventional CRRL, the SMO with NRL achieves suppressing the chattering phenomenon and tracking the transient process rapidly and accurately. The stability analysis is given to prove the convergence of the SMO through the Lyapunov stability theory. Simulation and experimental results show the effectiveness of the proposed NRL method.

scholarly journals Efficient lock and home security system

2019 ◽  
Vol 4 (2) ◽  
pp. 112-120
Author(s):  
Hadjira BELAIDI ◽  
Nour-El-Houda MEDDAH
Keyword(s):  
Protected Area ◽  
Smart Phone ◽  
Security System ◽  
Motion Sensors ◽  
Entire System ◽  
Security Systems ◽  
Home Security ◽  
Rfid Reader ◽  
First Motion

This work deals with lock and home security systems. First, Motion sensors detect movement indoors and outdoors to guard against intruders, protect valuables and more. Thus, if any movement, RFID reader will be activated and database will be scanned to identify the persons who have the access to the home. This enhances the effectiveness of the security system and provides the user with the complete, whole-house protection he needs. An RFID badge can be used to unlock the door and access to the home. Alerts also are received on the smart phone if motion is sensed in a protected area inside or outside; giving the user the information it needs to act quickly. The door can also be remotely locked/unlocked. A microcontroller (ATmega2560) is used to control the entire system, and GSM is used to send alerts to the Smartphone. An Ethernet shield that connects the microcontroller to the database (DB) is also added.

Some Problems & Methods for Remotely Controllable Automatic Home Security Systems

2008 ◽  
Author(s):  
R. Hariprakash ◽  
G. Venkat Ramu ◽  
T. Rajakumari ◽  
S. Ananthi ◽  
K. Padmanabhan
Keyword(s):  
Security Systems ◽  
Home Security

Sound field analysis and simulation for fluid machines

2009 ◽  
Vol 40 (1) ◽  
pp. 15-22 ◽  
Author(s):  
Shao-Yi Hsia ◽  
Shih-Ming Chiu ◽  
Jyin-Wen Cheng
Keyword(s):  
Sound Field ◽  
Field Analysis

scholarly journals Sound Field Analysis Based on Analytical Beamforming

2006 ◽  
Vol 2007 (1) ◽  
Author(s):  
M. Guillaume ◽  
Y. Grenier
Keyword(s):  
Sound Field ◽  
Field Analysis

GSM Based Home Safety and Security System

2021 ◽  
Vol 6 (6) ◽  
pp. 69-73
Author(s):  
Md. Abdullah Al Rakib ◽  
Md. Moklesur Rahman ◽  
Md. Sohel Rana ◽  
Md. Sanjib Islam ◽  
Fysol Ibna Abbas
Keyword(s):  
Cell Phone ◽  
Security System ◽  
Remote Access ◽  
Home Safety ◽  
Security Systems ◽  
Home Appliances ◽  
Home Security ◽  
The World ◽  
A Cell

In this paper, we worked on how to control home apparatuses, safety, and security systems utilizing GSM innovation by utilizing a cell phone. We will likewise show that we can control the apparatuses even without a phone by sending an ordinary call. The favorable position of utilizing GSM innovation is that we can handle home appliances from any place in the world. This system permits the proprietor to control the appliances and to get a feedback status of the home apparatuses by sending calls just as through a portable application. For the home security system, we are utilizing an antitheft announcing system that will report the proprietor by sending a message and ringing a call. Likewise, for the security system, when fire or gas spillage is expected to occur, it will also report the proprietor by sending a call. Subsequently, by utilizing GSM innovation, it gives remote access to the gadgets to be controlled.

Finite element sound field analysis on measurement of absorption coefficient in a reverberation room -Relationships between inclination of walls and measurement results-

2021 ◽  
Vol 263 (1) ◽  
pp. 5571-5577
Author(s):  
Reiji Tomiku ◽  
Noriko Okamoto ◽  
Toru Otsuru ◽  
Shun Iwamoto ◽  
Shoma Suzuki
Keyword(s):  
Finite Element ◽  
Absorption Coefficient ◽  
Sound Field ◽  
Field Analysis ◽  
Reverberation Time ◽  
Absorption Coefficients ◽  
Sound Fields ◽  
Measurement Results ◽  
Coefficient Measurement ◽  
Absorption Performance

The absorption coefficients in a reverberation room are most representative measure for evaluating absorption performance of architectural materials. However, it is well known that measurement results of the coefficient vary according to a room shape of the measurement and area of the specimen. Numerical analyses based on wave acoustics are effective tools to investigate these factors on absorption coefficient measurement in reverberation room. In this study, sound fields for the measurement of absorption coefficient in reverberation room are analyzed by time domain finite element method (TDFEM). This study shows effectiveness of the analysis for investigation on causes of variation in the measurement results and improvement methods of the measurement. First, some measurement sound fields for absorption coefficient in reverberation rooms the walls of which are incline or decline are analyzed by the TDFEM. Next, reverberation times in each sound fields are calculated from the results obtained by TDFEM and the absorption coefficients are evaluated from the reverberation time of the room with and without specimen. Finally, the relationships among room shape, degree of inclination of the wall, the sound absorption coefficient of the specimen, frequencies and the measurement absorption coefficient are investigated.

Continuous angular position estimation of human ankle during unconstrained locomotion

2020 ◽  
Vol 60 ◽  
pp. 101968 ◽  
Author(s):  
Rohit Gupta ◽  
Inderjeet Singh Dhindsa ◽  
Ravinder Agarwal
Keyword(s):  
Angular Position ◽  
Position Estimation ◽  
Human Ankle

scholarly journals Bearing Fault Diagnosis Based on Spatial Features of 2.5 Dimensional Sound Field

2019 ◽  
Vol 2019 ◽  
pp. 1-10 ◽  
Author(s):  
Junjian Hou ◽  
Jun Ma ◽  
Zhanpeng Fang ◽  
Wuyi Ming ◽  
Wenbin He
Keyword(s):  
Fault Diagnosis ◽  
Diagnostic Test ◽  
Acoustic Field ◽  
Sound Field ◽  
Feature Reduction ◽  
Feature Model ◽  
Source Image ◽  
Field Variation ◽  
Diagnosis Method ◽  
Array Measurement

The traditional acoustic-based diagnosis (ABD) technique based on single-channel testing has a significant engineering value. Since its diagnosis robustness is sensitive to sound signal acquisition location, it develops slowly. To solve this problem, the 2-dimensional (2D) sound field variation near the machine is adopted for diagnosis by the near-field acoustic holography (NAH)- based fault diagnosis method with array measurement. However, its performance is limited due to the neglect of the sound field normal change information. To dig the sound field fault information further, a 2.5-dimensional (2.5D) acoustic field diagnosis method is presented in this paper and its performance compared with the 2D technology is verified by the bearing diagnostic test. Different from the 2D technique with only one source image, the 2.5D acoustic field model consists of source image, holographic sound image, and the differences between them, and its effective feature model is constructed by Gabor wavelet feature extraction and random forest feature reduction algorithm. The diagnostic effect of the 2.5D technique compared with the 2D technique increases more than 11% in the bearing diagnostic test. It provides new ideas for the development of the NAH-based fault diagnosis method, and further improves the ABD technique-based array measurement.

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