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Modeling Pulse-to-Pulse Coherent Doppler Sonar 脉冲对脉冲相干多普勒声纳建模
Canadian Acoustics - Acoustique Canadienne Pub Date : 2008-10-01 DOI: 10.1175/2008JTECHO585.1
L. Zedel
{"title":"Modeling Pulse-to-Pulse Coherent Doppler Sonar","authors":"L. Zedel","doi":"10.1175/2008JTECHO585.1","DOIUrl":"https://doi.org/10.1175/2008JTECHO585.1","url":null,"abstract":"Abstract Coherent Doppler sonar provides a powerful tool for probing boundary layer flows under field and laboratory conditions. However, velocity profiling applications of this technique are complicated by characteristic velocity and range ambiguities. Proper implementation for any application requires careful design so that performance can be accurately predicted. In this paper, a computer model capable of simulating coherent Doppler operation is presented. The point scatterer model operates in three dimensions and accommodates bistatic transducer geometries. Excellent agreement is demonstrated between model simulations and laboratory trials. Some simple model applications are presented. The model has been developed for profiling applications but is equally suited to modeling point measurement acoustic Doppler velocimeters.","PeriodicalId":39902,"journal":{"name":"Canadian Acoustics - Acoustique Canadienne","volume":"25 1","pages":"1834-1844"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1175/2008JTECHO585.1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64585061","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 30
Wavelet application in acoustic emission signal detection of wire related events in pipeline 小波在管道中电线相关事件声发射信号检测中的应用
Canadian Acoustics - Acoustique Canadienne Pub Date : 2008-06-01 DOI: 10.32920/ryerson.14647494.v1
Ran Wu, Z. Liao, L. Zhao, X. Kong
{"title":"Wavelet application in acoustic emission signal detection of wire related events in pipeline","authors":"Ran Wu, Z. Liao, L. Zhao, X. Kong","doi":"10.32920/ryerson.14647494.v1","DOIUrl":"https://doi.org/10.32920/ryerson.14647494.v1","url":null,"abstract":"This thesis establishes an automatic classification program for the signal detection work in pipeline inspection. Time-scale analysis provides the basic methodology of this thesis work. The wavelet transform is implemented in the program for filtering out the majority of noise and detect needed signals. As a popular nondestructive test, acoustic emission (AE) testing has been widely used in many physical and engineering fields such as leak detection and pipeline inspection. Among those applied AE tests, a common problem is to extract the physical features of the ideal events, so as to detect similar signals. In acoustic signal processing, those features can be represented as joint time frequency distribution. However, classical signal processing methods only give global information on either time or frequency domain, while local information is lots. Although the short-time Fourier transform (STFT) is developed to analyze time and frequency details simultaneously, it can only achieve limited precision. Other time-frequency methods are also applied in AE signal processing, but they all have the problem of resolution and time consuming. Wavelet transform is a time-scale technique with adaptable precision, which makes better feature extraction and detail detection. This thesis is an application of wavelet transform in AE signal detection where various noise exists. The wavelet transform with Morelet wavelet as the mother wavelet provides the basis of the program for auto classification in this thesis work. Finally the program is tested with two industrial projects to verify the workability of wavelet transforms and the reliability of the developed auto classifiers.","PeriodicalId":39902,"journal":{"name":"Canadian Acoustics - Acoustique Canadienne","volume":"36 1","pages":"31-41"},"PeriodicalIF":0.0,"publicationDate":"2008-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69469186","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Parametric Analysis of Ultrasound Backscatter Signals for Monitoring Cancer Cell Structural Changes During Cancer Treatment 超声后向散射信号在肿瘤治疗过程中监测癌细胞结构变化的参数分析
Canadian Acoustics - Acoustique Canadienne Pub Date : 2007-06-01 DOI: 10.32920/ryerson.14638620
Harshitha Nallapareddy, S. Krishnan, M. Kolios
{"title":"Parametric Analysis of Ultrasound Backscatter Signals for Monitoring Cancer Cell Structural Changes During Cancer Treatment","authors":"Harshitha Nallapareddy, S. Krishnan, M. Kolios","doi":"10.32920/ryerson.14638620","DOIUrl":"https://doi.org/10.32920/ryerson.14638620","url":null,"abstract":"Parametric Analysis of Ultrasound Backscatter Signals for Monitoring Cancer Cell Structural Changes During Cancer Treatment","PeriodicalId":39902,"journal":{"name":"Canadian Acoustics - Acoustique Canadienne","volume":"35 1","pages":"47-54"},"PeriodicalIF":0.0,"publicationDate":"2007-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69468731","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Medical diagnostic ultrasound 医学诊断超声
Canadian Acoustics - Acoustique Canadienne Pub Date : 2007-03-02 DOI: 10.1063/1.2718756
E. Everbach
{"title":"Medical diagnostic ultrasound","authors":"E. Everbach","doi":"10.1063/1.2718756","DOIUrl":"https://doi.org/10.1063/1.2718756","url":null,"abstract":"Although the roots of medical ultrasound lie in military technology, many of the past decade's advances have come from exploiting new understandings in the physics of mammalian tissues.","PeriodicalId":39902,"journal":{"name":"Canadian Acoustics - Acoustique Canadienne","volume":"35 1","pages":"3-9"},"PeriodicalIF":0.0,"publicationDate":"2007-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1063/1.2718756","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"58424817","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Perceptual differences in categorization of speech sounds by Norwegian/English bilinguals 挪威语/英语双语者语音分类的知觉差异
Canadian Acoustics - Acoustique Canadienne Pub Date : 2003-09-01 DOI: 10.1121/1.4786559
A. Dypvik, E. Slawinski
{"title":"Perceptual differences in categorization of speech sounds by Norwegian/English bilinguals","authors":"A. Dypvik, E. Slawinski","doi":"10.1121/1.4786559","DOIUrl":"https://doi.org/10.1121/1.4786559","url":null,"abstract":"Bilingual immigrants face unique challenges in every-day living. They perceive acoustically identical stimuli differently depending on the language being stimuli differently depending on the language being processed at the time and the extent of this perceptual difference is related to the timing and extent of exposure to the second language. It is proposed that because /v/ and /w/ are allophones in the Norwegian language, English phonemic boundaries of bilingual listeners between /v/ and /w/ will vary from those of English speakers.","PeriodicalId":39902,"journal":{"name":"Canadian Acoustics - Acoustique Canadienne","volume":"31 1","pages":"48-49"},"PeriodicalIF":0.0,"publicationDate":"2003-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64059228","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Finite element modeling of acoustical silencers 消声器的有限元建模
Canadian Acoustics - Acoustique Canadienne Pub Date : 2002-09-01 DOI: 10.7939/R3B56DG3N
S. Bilawchuk, K. Fyfe
{"title":"Finite element modeling of acoustical silencers","authors":"S. Bilawchuk, K. Fyfe","doi":"10.7939/R3B56DG3N","DOIUrl":"https://doi.org/10.7939/R3B56DG3N","url":null,"abstract":"The finite element modeling of acoustic silencers was presented. The model was developed taking into account factors such as geometry, sound absorbing materials and environmental conditions. The results were excellent for purely reactive acoustic silencers and good for absorptive silencers. A more complicated model for sound absorbing materials and the inclusion of flow was required for more accurate results.","PeriodicalId":39902,"journal":{"name":"Canadian Acoustics - Acoustique Canadienne","volume":"30 1","pages":"64-65"},"PeriodicalIF":0.0,"publicationDate":"2002-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71370154","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Prediction, visualization and auralization of noise in industrial workrooms during computer 'walk-through' - The PlantNoise system 预测，可视化和听觉的噪音在工业车间在计算机“漫步”-工厂噪音系统
Canadian Acoustics - Acoustique Canadienne Pub Date : 2001-12-01 DOI: 10.3397/1.599289
M. Hodgson, Nelson Heerema
{"title":"Prediction, visualization and auralization of noise in industrial workrooms during computer 'walk-through' - The PlantNoise system","authors":"M. Hodgson, Nelson Heerema","doi":"10.3397/1.599289","DOIUrl":"https://doi.org/10.3397/1.599289","url":null,"abstract":"A new approach to industrial-noise modeling that takes the form of a combined industrial-noise prediction, visualization and auralization system is presented. The system, called PlantNoise, is designed to predict and present noise to a listener in a way that accurately simulates the noise levels that a worker in a workroom would be exposed to.","PeriodicalId":39902,"journal":{"name":"Canadian Acoustics - Acoustique Canadienne","volume":"29 1","pages":"26-28"},"PeriodicalIF":0.0,"publicationDate":"2001-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3397/1.599289","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69581952","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Temporal jitter mimics the effects of aging on word identification and word recall in noise 时间抖动模拟了老化对噪声条件下单词识别和单词记忆的影响
Canadian Acoustics - Acoustique Canadienne Pub Date : 2000-09-01 DOI: 10.14288/1.0089735
Sasha Brown, M. Pichora-Fuller
{"title":"Temporal jitter mimics the effects of aging on word identification and word recall in noise","authors":"Sasha Brown, M. Pichora-Fuller","doi":"10.14288/1.0089735","DOIUrl":"https://doi.org/10.14288/1.0089735","url":null,"abstract":"The simulation of the neural jitter disrupting the ability to phase-lock to lower frequencies in the aging auditory system was done. The applied jitter was determined to affect young adults performance so that it resembles that of older adults in two different tasks. Such findings helped in explaining age related decline in the ability to perceive speech, particularly in the presence of background noise, when no hearing loss is evidenced by standard clinical pure-tone audiometry. Degraded perceptual processing affects processes, such as memory, which are cognitive. Cognitive processes are employed to rescue signals degraded at the perceptual level.","PeriodicalId":39902,"journal":{"name":"Canadian Acoustics - Acoustique Canadienne","volume":"28 1","pages":"126-128"},"PeriodicalIF":0.0,"publicationDate":"2000-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66898383","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 19
Perceptual and Acoustic Analysis of Word Initial Voicing Contrasts Across Speaker Age 不同说话人年龄的单词初始发声对比的感知与声学分析
Canadian Acoustics - Acoustique Canadienne Pub Date : 1996-09-01 DOI: 10.7939/R3Z892K3M
Kelly Lucky, M. Hodge, A. Rochet
{"title":"Perceptual and Acoustic Analysis of Word Initial Voicing Contrasts Across Speaker Age","authors":"Kelly Lucky, M. Hodge, A. Rochet","doi":"10.7939/R3Z892K3M","DOIUrl":"https://doi.org/10.7939/R3Z892K3M","url":null,"abstract":"","PeriodicalId":39902,"journal":{"name":"Canadian Acoustics - Acoustique Canadienne","volume":"24 1","pages":"25-25"},"PeriodicalIF":0.0,"publicationDate":"1996-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71370655","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Vibration Problem 振动问题
Canadian Acoustics - Acoustique Canadienne Pub Date : 1996-09-01 DOI: 10.32388/tvgh3z
P. Alves
{"title":"Vibration Problem","authors":"P. Alves","doi":"10.32388/tvgh3z","DOIUrl":"https://doi.org/10.32388/tvgh3z","url":null,"abstract":"1.0 Introduction Nova Gas Transmission has an installed fleet of 31 pipeline compressors running on magnetic bearings. The total experience in excess of 1 million running hours was accumulated over the past 10 years of operation. The intent of this paper is to present a very brief introduction to magnetic bearings, and to show two test cases in which the bearings were used to determine the cause of machine vibrations and prevent impending failures.","PeriodicalId":39902,"journal":{"name":"Canadian Acoustics - Acoustique Canadienne","volume":"24 1","pages":"89-89"},"PeriodicalIF":0.0,"publicationDate":"1996-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69641027","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 30
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