Acoustic Sensor Network for Relative Positioning of Nodes

Marziani, Carlos De; Ureña, J.; Hernández, Álvaro; Mazo, Manuel; Garcı́a, J.J.; Jiménez, A.; Rubio, Ma Carmen Perez; Álvarez, F.; Villadangos, J.M.

doi:10.3390/s91108490

Cited by 16 publications

(8 citation statements)

References 16 publications

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“…In recent years, there is an emphasis on the monitoring of various structures in real time, and many innovative algorithms [72][73][74][75][76][77][78][79], sensors [14,80,81], and systems [82][83][84][85][86] have been developed for such a purpose. An AE sensor is normally small, and it can be easily attached to the host structure for real-time monitoring in a nondestructive way [81,[87][88][89][90].…”

Section: Introductionmentioning

confidence: 99%

Feasibility Study of Real-Time Monitoring of Pin Connection Wear Using Acoustic Emission

et al. 2018

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Pin connections are one of the most important connecting forms and they have been widely used in engineering fields. In its service, pin connections are subject to wear, and it will be beneficial if the health condition of pin connections can be monitored in real time. In this paper, an acoustic emission (AE)-based method was developed to monitor wear degree of low rotational speed pin connections in real time in a nondestructive way. Most pin connections are operated at low rotational speed. To facilitate the research, an experimental apparatus to accelerate the wear test of low rotational speed pin connections was designed and fabricated. The piezoceramic AE sensor was mounted on the test apparatus in a nondestructive way, and it was capable of real-time monitoring. Accelerated wear tests of low rotational speed pin connections were conducted. To verify the results of the AE technique, a VHX-600E digital (from Keyence, Osaka, Japan) microscope was applied to observe the micrographs of the tested pins. The experimental results show that AE activity existed throughout the entire wear process, and it was the most prominent in the serious wear phase. The wear degree of the pin connections can be reflected qualitatively by the signal strength and the accumulative signal strength of the AE signals. In addition, two different wear forms can be distinguished by comparing the signal strength values of all specimens. Micrographs of all specimens confirm these results, and determine that the two wear forms include adhesive wear and abrasive wear. Furthermore, AE results demonstrated that adhesive wear is the main mode of wear for the low rotational speed pin connections, and the signal strength of the adhesive wear is around 190 times larger than that of abrasive wear. This feasibility study demonstrated that the developed acoustic emission technique can be utilized in the wear monitoring of pin connections in real time in a nondestructive way.

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Section: Introductionmentioning

confidence: 99%

Feasibility Study of Real-Time Monitoring of Pin Connection Wear Using Acoustic Emission

et al. 2018

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“…The authors argue that besides considering measurement errors, algorithmic errors should be explored in assessing localization accuracy. In [ 14 , 15 ], acoustic sensor networks for a relative localization system are analyzed by reporting the accuracy achieved in the position estimation. The proposed systems are designed for those applications where objects are not restricted to a particular environment and thus one cannot depend on any external infrastructure to compute their positions.…”

Section: Related Workmentioning

confidence: 99%

Cooperative Anchor-Free Position Estimation for Hierarchical Wireless Sensor Networks

Wen

Hsiao

Chan

2010

Sensors

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This paper proposes a distributed algorithm for establishing connectivity and location estimation in cluster-based wireless sensor networks. The algorithm exploits the information flow while coping with distributed signal processing and the requirements of network scalability. Once the estimation procedure and communication protocol are performed, sensor clusters can be merged to establish a single global coordinate system without GPS sensors using only distance information. In order to adjust the sensor positions, the refinement schemes and cooperative fusion approaches are applied to reduce the estimation error and improve the measurement accuracy. This paper outlines the technical foundations of the localization techniques and presents the tradeoffs in algorithm design. The feasibility of the proposed schemes is shown to be effective under certain assumptions and the analysis is supported by simulation and numerical studies.

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“…This improvement brought important advantages: simultaneous emission, higher precision, larger robustness to noise and the capability to introduce privacy in the location process. Since one of the first encoding proposals carried out by Hazas and Ward with Gold sequences [ 6 ], several works have arisen in the field of acoustic LPS that employ more and more complex encoding schemes, with the emission of Kasami sequences [ 7 ], Complementary Sets of Sequences (CSS) [ 8 ] and Loosely Synchronous (LS) codes [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Doppler Effect on the Pulse Compression of Different Codes Emitted by an Ultrasonic LPS

Paredes

Aguilera

Álvarez

et al. 2011

Sensors

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This work analyses the effect of the receiver movement on the detection by pulse compression of different families of codes characterizing the emissions of an Ultrasonic Local Positioning System. Three families of codes have been compared: Kasami, Complementary Sets of Sequences and Loosely Synchronous, considering in all cases three different lengths close to 64, 256 and 1,024 bits. This comparison is first carried out by using a system model in order to obtain a set of results that are then experimentally validated with the help of an electric slider that provides radial speeds up to 2 m/s. The performance of the codes under analysis has been characterized by means of the auto-correlation and cross-correlation bounds. The results derived from this study should be of interest to anyone performing matched filtering of ultrasonic signals with a moving emitter/receiver.

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Acoustic Sensor Network for Relative Positioning of Nodes

Cited by 16 publications

References 16 publications

Feasibility Study of Real-Time Monitoring of Pin Connection Wear Using Acoustic Emission

Feasibility Study of Real-Time Monitoring of Pin Connection Wear Using Acoustic Emission

Cooperative Anchor-Free Position Estimation for Hierarchical Wireless Sensor Networks

Analysis of Doppler Effect on the Pulse Compression of Different Codes Emitted by an Ultrasonic LPS

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