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Author : Dimitri M. Donskoy
Publisher :
ISBN 13 : 9783902613110
Total Pages : pages
Book Rating : 4.6/5 (131 download)
Download or read book Resonance and Nonlinear Seismo-Acoustic Land Mine Detection written by Dimitri M. Donskoy and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 8 pages
Book Rating : 4.:/5 (318 download)
Download or read book Nonlinear Acoustic Techniques for Land Mine Detection written by and published by . This book was released on 2002 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: When airborne sound couples into the ground seismic waves can interact with a target buried in the soil and effect the vibration velocity of the surface. Acoustic-to-seismic coupling (using linear acoustic techniques) has proven to be an extremely accurate technology for locating buried land mines [J.M. Sabatier and N. Xiang, IEEE Trans. Geoscience and Remote Sensing 39, 1146-1154 (2001)] . Donskoy [SPIE Proceedings 3392, 211-217 (1998); 3710, 239-246 (1999)] has suggested a nonlinear technique that can detect an acoustically compliant buried mine that is insensitive to relatively noncompliant targets. (Utilizing both techniques could eliminate certain types of false alarms.) Airborne sound at two primary frequencies f1 and f2 undergo acoustic-to-seismic coupling and a superimposed seismic wave interacts with the compliant mine and soil to generate a difference frequency component that can effect the vibration velocity at the surface. Geophone measurements scanning the soil's surface at the difference frequency (chosen at a resonance) profile the mine with more relative sensitivity than the linear profiles - but off the mine some nonlinearity exists. Amplitude dependent frequency response curves for a harmonically driven mass-soil oscillator are used to find the nonlinearity of the soil acting as a "soft" spring. Donskoy's nonlinear mechanism (over the mine) involves a simple model of the top surface of the mine-soil planar surface separating two elastic surfaces. During the compression phase of the wave, the surfaces stay together and then separate under the tensile phase due to a relatively high compliance of the mine. This "bouncing" soil-mine interface is thought to be a bi-modular oscillator that is inherently nonlinear.
Author : Sean Andrew Genis
Publisher :
ISBN 13 :
Total Pages : 120 pages
Book Rating : 4.:/5 (271 download)
Download or read book Nonlinear Acoustic Landmine Detection written by Sean Andrew Genis and published by . This book was released on 2007 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: Acoustic-to-seismic (A/S) coupling involving airborne sound is used to generate soil vibrations that interact with the top plate of a buried landmine. Due to scattering, the interaction at the soil-mine interface produces an enhanced and strongly nonlinear soil surface vibration directly over the buried landmine. Resonant tuning curves of the soil-mine system show that the nonlinear behavior observed near resonance for "on the mine" locations is considerably stronger that that seen "off the mine." This suggests that some false alarms due to the resonant effects of the ground's natural layering may be eliminated by comparing the frequency softening in resonant tuning curves between "off" and "on target" locations. Experiments with the soil-mass oscillator (SMO) apparatus show that the nonlinear acoustic landmine detection problem involves mesoscopic nanoscale nonlinear elastic behavior. Resonant tuning curves have linear backbones, a behavior also characteristic of certain geomaterials (sandstone). Elasto-slip (Iwan 1966) and LISA (Scalerandi et al 2002) models of hysteresis are used to explain this phenomenon. The soil-mine interface, which is modeled using a soil-plate oscillator (SPO) apparatus, is extremely nonlinear. The SPO is excited using both acoustic and electromagnetic means. A/S coupling experiments are employed to simultaneously measure vibrations at the underside of a buried clamped plate and the soil surface. Electrodynamic experiments determine the motional impedance of a combined soil-plate system. At large drive amplitudes, the backbone curves obtained from the SPO exhibit more complicated behavior, which is described using a bilinear hysteresis model (Caughey 1966). Nonlinear acoustic landmine detection experiments are performed in the anechoic chamber facility using both a buried acrylic drum-like mine simulant and a VS 1.6 plastic anti-tank landmine. Using an automated laser Doppler vibrometer, soil surface vibraions are profiled as a function of scan position. Elements of both the elasto-slip and bilinear hysteresis models appear in these experiments.
Author : Tribikram Kundu
Publisher : Springer
ISBN 13 : 3319944762
Total Pages : 761 pages
Book Rating : 4.3/5 (199 download)
Download or read book Nonlinear Ultrasonic and Vibro-Acoustical Techniques for Nondestructive Evaluation written by Tribikram Kundu and published by Springer. This book was released on 2018-10-19 with total page 761 pages. Available in PDF, EPUB and Kindle. Book excerpt: This multi-contributed volume provides a practical, applications-focused introduction to nonlinear acoustical techniques for nondestructive evaluation. Compared to linear techniques, nonlinear acoustical/ultrasonic techniques are much more sensitive to micro-cracks and other types of small distributed damages. Most materials and structures exhibit nonlinear behavior due to the formation of dislocation and micro-cracks from fatigue or other types of repetitive loadings well before detectable macro-cracks are formed. Nondestructive evaluation (NDE) tools that have been developed based on nonlinear acoustical techniques are capable of providing early warnings about the possibility of structural failure before detectable macro-cracks are formed. This book presents the full range of nonlinear acoustical techniques used today for NDE. The expert chapters cover both theoretical and experimental aspects, but always with an eye towards applications. Unlike other titles currently available, which treat nonlinearity as a physics problem and focus on different analytical derivations, the present volume emphasizes NDE applications over detailed analytical derivations. The introductory chapter presents the fundamentals in a manner accessible to anyone with an undergraduate degree in Engineering or Physics and equips the reader with all of the necessary background to understand the remaining chapters. This self-contained volume will be a valuable reference to graduate students through practising researchers in Engineering, Materials Science, and Physics. Represents the first book on nonlinear acoustical techniques for NDE applications Emphasizes applications of nonlinear acoustical techniques Presents the fundamental physics and mathematics behind nonlinear acoustical phenomenon in a simple, easily understood manner Covers a variety of popular NDE techniques based on nonlinear acoustics in a single volume
Author : Acoustical Society of America
Publisher :
ISBN 13 :
Total Pages : 1552 pages
Book Rating : 4.F/5 ( download)
Download or read book The Journal of the Acoustical Society of America written by Acoustical Society of America and published by . This book was released on 2007 with total page 1552 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 16 pages
Book Rating : 4.:/5 (684 download)
Download or read book Acoustic Resonance for Nonmetallic Mine Detection written by and published by . This book was released on 1998 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: The feasibility of acoustic resonance for detection of plastic mines was investigated by researchers at the Oak Ridge National Laboratory's Instrumentation and Controls Division under an internally funded program. The data reported in this paper suggest that acoustic resonance is not a practical method for mine detection. Representative small plastic anti-personnel mines were tested, and were found to not exhibit detectable acoustic resonances. Also, non-metal objects known to have strong acoustic resonances were tested with a variety of excitation techniques, and no practical non-contact method of exciting a consistently detectable resonance in a buried object was discovered. Some of the experimental data developed in this work may be useful to other researchers seeking a method to detect buried plastic mines. A number of excitation methods and their pitfalls are discussed. Excitation methods that were investigated include swept acoustic, chopped acoustic, wavelet acoustic, and mechanical shaking. Under very contrived conditions, a weak response that could be attributed to acoustic resonance was observed, but it does not appear to be practical as a mine detection feature. Transfer properties of soil were investigated. Impulse responses of several representative plastic mines were investigated. Acoustic leakage coupling, and its implications as a disruptive mechanism were investigated.
Author : Michelle Beatrice Mattingly
Publisher :
ISBN 13 :
Total Pages : 202 pages
Book Rating : 4.:/5 (747 download)
Download or read book A Mathematical Model for the Acoustic and Seismic Properties of the Landmine Detection Problem written by Michelle Beatrice Mattingly and published by . This book was released on 2008 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 42 pages
Book Rating : 4.:/5 (684 download)
Download or read book Humanitarian Mine Detection by Acoustic Resonance written by and published by . This book was released on 1998 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: The JASON Committee at MITRE Corp. was tasked by DARPA to inquire into suitable technologies for humanitarian mine detection. Acoustic resonance was one of the very few technologies that the JASONs determined might be promising for the task, but was as yet unexplored at the time that they conducted their inquiry. The objective of this Seed Money investigation into acoustic resonance was to determine if it would be feasible to use acoustic resonance to provide an improvement to present methods for humanitarian mine detection. As detailed in this report, acoustic resonance methods do not appear to be feasible for this task. Although acoustic resonant responses are relatively easy to detect when they exist, they are very difficult to excite by the non-contact means that must be used for buried objects. Despite many different attempts, this research did not discover any practical means of using sound to excite resonant responses in objects known to have strong resonances. The shaker table experiments did see an effect that might be attributable to the resonance of the object under test, but the effect was weak, and exploited the a priori knowledge of the resonant frequency of the object under test to distinguish it from the background. If experiments that used objects known to have strong acoustic resonances produced such marginal results, this does not seem to be a practical method to detect objects with weak resonances or non-existent resonances. The results of this work contribute to the ORNL countermine initiative. ORNL is exploring several unconventional mine detection technologies, and is proposed to explore others. Since this research has discovered some major pitfalls in non-metallic mine detection, this experience will add realism to other strategies proposed for mine detection technologies. The experiment provided hands-on experience with inert plastic mines under field conditions, and gives ORNL additional insight into the problems of developing practical field-deployable methods of mine detection.
Author :
Publisher :
ISBN 13 :
Total Pages : 16 pages
Book Rating : 4.:/5 (653 download)
Download or read book Beheers de groei written by and published by . This book was released on 1973 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Claudio Guarnaccia
Publisher : MDPI
ISBN 13 : 3039282840
Total Pages : 584 pages
Book Rating : 4.0/5 (392 download)
Download or read book Modelling, Simulation and Data Analysis in Acoustical Problems written by Claudio Guarnaccia and published by MDPI. This book was released on 2020-06-23 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modelling and simulation in acoustics is currently gaining importance. In fact, with the development and improvement of innovative computational techniques and with the growing need for predictive models, an impressive boost has been observed in several research and application areas, such as noise control, indoor acoustics, and industrial applications. This led us to the proposal of a special issue about “Modelling, Simulation and Data Analysis in Acoustical Problems”, as we believe in the importance of these topics in modern acoustics’ studies. In total, 81 papers were submitted and 33 of them were published, with an acceptance rate of 37.5%. According to the number of papers submitted, it can be affirmed that this is a trending topic in the scientific and academic community and this special issue will try to provide a future reference for the research that will be developed in coming years.
Author : Anthony A. Atchley
Publisher : American Institute of Physics
ISBN 13 :
Total Pages : 706 pages
Book Rating : 4.3/5 (91 download)
Download or read book Innovation in Nonlinear Accoustics: ISNA 17 written by Anthony A. Atchley and published by American Institute of Physics. This book was released on 2006-06-09 with total page 706 pages. Available in PDF, EPUB and Kindle. Book excerpt: State College, Pennsylvania, 18-22 July 2005
Author : Benjamin Joseph Copenhaver
Publisher :
ISBN 13 :
Total Pages : 226 pages
Book Rating : 4.:/5 (884 download)
Download or read book Nonlinear Acoustical Detection of Buried Landmines Using Pulsed Standoff Excitation written by Benjamin Joseph Copenhaver and published by . This book was released on 2014 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt: To help resolve certain practical issues with acoustical methods for landmine detection, experiments were performed using a pulsed, standoff source consisting of sixteen speakers mounted on a circular arc. This source, as well as a pair of 18-inch subwoofers, were used separately for acoustical excitation of the buried mine, and the response of the target site was examined as a function of source frequency, sound pressure level, and excitation signal type, with a particular focus on multitone signals. In addition, modeling was undertaken to investigate the effects of nonlinearity, including bimodular nonlinearity, on frequency generation. A numerical, time-domain solution based on a lumped-element model proposed by Donskoy et al. [J. Acoust. Soc. Am. 117, 690 (2005)] was developed and used to simulate pulsed excitation and the effects of bimodular nonlinearity, which allowed experimentally observed spectra to be compared with modeled results.
Author : Thomas Rossing
Publisher : Springer
ISBN 13 : 1493907557
Total Pages : 1280 pages
Book Rating : 4.4/5 (939 download)
Download or read book Springer Handbook of Acoustics written by Thomas Rossing and published by Springer. This book was released on 2015-01-15 with total page 1280 pages. Available in PDF, EPUB and Kindle. Book excerpt: Acoustics, the science of sound, has developed into a broad interdisciplinary field encompassing the academic disciplines of physics, engineering, psychology, speech, audiology, music, architecture, physiology, neuroscience and others. Here is an unparalleled modern handbook reflecting this richly interdisciplinary nature edited by one of the acknowledged masters in the field, Thomas Rossing. Researchers and students benefit from the comprehensive contents spanning: animal acoustics including infrasound and ultrasound, environmental noise control, music and human speech and singing, physiological and psychological acoustics, architectural acoustics, physical and engineering acoustics, medical acoustics and ocean acoustics. The Springer Handbook of Acoustics reviews the most important areas of acoustics, with emphasis on current research. The authors of the various chapters are all experts in their fields. Each chapter is richly illustrated with figures and tables. The latest research and applications are incorporated throughout, e.g. computer recognition and synthesis of speech, physiological acoustics, psychological acoustics, thermoacoustics, diagnostic imaging and therapeutic applications and acoustical oceanography. This new edition of the Handbook features over 11 revised and expanded chapters, new illustrations and two new chapters covering microphone arrays, acoustic metamaterials and acoustic emission. These improvements will make the handbook even more useful as a reference and a guide for researchers and students in every branch of acoustics. Praise for the first edition: "This treatise is a successful attempt to cover in one book the diverse field of acoustics, which ranges from physics to music and from formal mathematics to technological applications. ... It is this reviewer's opinion that a handbook like Rossing's, which covers the whole field of acoustics, serves a real purpose because it not only gives one a chance to see how one's specialty is covered but it also permits one to make a quick survey of other acoustical areas." (Leo Beranek, American Journal of Physics, Vol. 77 (12), December, 2009) "The Springer Handbook of Acoustics falls into that exceptional list. ...every physics department should have a copy available." (John L. Hubisz, The Physics Teacher, Vol. 48, March, 2010) "This handbook is an excellent addition to the acoustics literature. ... The handbook nicely covers both basics and advances in several areas of acoustics. Several chapters provide good mathematical depth, making the handbook useful as a research and technical resource. ...Overall, a very useful educational and research resource. Summing Up: Recommended. Upper-division undergraduates through professionals." (M. G. Prasad, CHOICE, Vol. 45 (5), January, 2008) "This book covers a wide range of topics and the inclusion of musical acoustics, computer and electronic music appeal to me (singer, song-writer, performer and recording studio co-owner). This handbook is probably well suited for an undergraduate-level introduction to an acoustics course. ... The wide range of topics, inclusion of music-related chapters, eye-pleasing presentations and other useful features make this a very good book to have on your shelf." (Tim Casey, International Journal of Acoustics and Vibration, Vol. 13 (1), 2008) "The Springer Handbook of Acoustics comprises 28 chapters written by 33 authors. The Handbook of Acoustics is useful as a source book for anyone who needs or wants to become familiar with the jargon and issues related to a specific subfield of acoustics ... ." (Robert I. Odom, Siam Review, Vol. 50 (3), 2008) The Springer Handbook of Acoustics reviews the most important areas of acoustics, with emphasis on current research. The authors of the various chapters are all experts in their fields. Each chapter is richly illustrated with figures and tables. The latest research and applications are incorporated throughout, e.g. computer recognition and synthesis of speech, physiological acoustics, psychological acoustics, thermoacoustics, diagnostic imaging and therapeutic applications and acoustical oceanography. This new edition of the Handbook features over 13 revised and expanded chapters, new illustrations and 3 new chapters covering microphone arrays, acoustic metamaterials and acoustic emission. These improvements will make the handbook even more useful as a reference and a guide for researchers and students in every branch of acoustics.
Author : ShiXi Joe Qiu
Publisher :
ISBN 13 :
Total Pages : 175 pages
Book Rating : 4.:/5 (42 download)
Download or read book Acoustic Land Mine Detection written by ShiXi Joe Qiu and published by . This book was released on 1999 with total page 175 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 29 pages
Book Rating : 4.:/5 (318 download)
Download or read book False Indicators to Acoustic-To-Seismic Buried Landmine Detection written by and published by . This book was released on 2007 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt: The proliferation of relatively cheap landmines in many of the world's conflicts has led to a critical situation. Most methods of locating landmines trigger on too many false alarms must each be investigated before declaring an area to be clear of mines. This led to the need for an accurate means of detection coupled with a low false alarm rate. The University of Mississippi has developed an acoustic/seismic technique to meet this need. In 2002, the Office of Naval Research issued Grant N00014-02-1-0878 to conduct research to better understand the causes of false alarms using this method and to develop methods to significantly reduce them. This report discusses the significant research advances including a clearer understanding of the phenomenology underlying the technology, development of models, and signal processing techniques to reduce false alarms.
Author :
Publisher :
ISBN 13 :
Total Pages : 11 pages
Book Rating : 4.:/5 (318 download)
Download or read book Advances in Acoustic Landmine Detection written by and published by . This book was released on 2006 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: The phenomenon of the acoustic-to-seismic (A/S) coupling of airborne sound into the ground for buried anti-personnel and anti-tank landmine detection is well established [J.M. Sabatier and N. Xiang, IEEE Trans. on Geoscience & Remote Sensing, 39, pp 1146-1154 (2001); N. Xiang and J.M. Sabatier, J. Acoust. Soc. Am, 113, pp. 1333-1341 (2003)]. A sound source is used to insonify the ground surface. The airborne sound couples into the soil and excites the vibrational energy of the soil matrix. An anomaly in the vibrational energy occurs on the ground surface in a region very near a buried landmine. This anomaly can be detected with a vibration sensor. This paper will discuss vibration sensors that are currently being used to measure the vibrations due to the presence of a buried landmine. These instruments include a geophone, laser, ultrasonic and radar Doppler vibrometers, and a whole field optical sensor. The detection ability of fused sensors comprised of the A/S laser Doppler vibrometer based sensor and a ground penetrating synthetic aperture radar is also being investigated. Researchers at the University of Mississippi, Planning Systems Incorporated, and MetroLaser, Inc. are investigating all of the vibration sensors described above. This paper will present results of this research.
Author : Jacqueline MacDonald Gibson
Publisher : Rand Corporation
ISBN 13 : 9780833033017
Total Pages : 336 pages
Book Rating : 4.0/5 (33 download)
Download or read book Alternatives for Landmine Detection written by Jacqueline MacDonald Gibson and published by Rand Corporation. This book was released on 2003 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: At the rate that government and nongovernmental organizations are clearing existing landmines, it will take 450-500 years to rid the world of them. Concerned about the slow pace of demining, the Office of Science and Technology asked RAND to assess potential innovative technologies being explored and to project what funding would be required to foster the development of the more promising ones. The authors of this report suggest that the federal government undertake a research and development effort to develop a multisensor mine detection system over the next five to eight years.
