Download or read book Characterization of Impulse Noise and Hazard Analysis of Impulse Noise Induced Hearing Loss Using AHAAH Modeling written by Qing Wu and published by . This book was released on 2014 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: Millions of people across the world are suffering from noise induced hearing loss (NIHL), especially under working conditions of either continuous Gaussian or non-Gaussian noise that might affect human's hearing function. Impulse noise is a typical non-Gaussian noise exposure in military and industry, and generates severe hearing loss problem. This study mainly focuses on characterization of impulse noise using digital signal analysis method and prediction of the auditory hazard of impulse noise induced hearing loss by the Auditory Hazard Assessment Algorithm for Humans (AHAAH) modeling. A digital noise exposure system has been developed to produce impulse noises with peak sound pressure level (SPL) up to 160 dB. The characterization of impulse noise generated by the system has been investigated and analyzed in both time and frequency domains. Furthermore, the effects of key parameters of impulse noise on auditory risk unit (ARU) are investigated using both simulated and experimental measured impulse noise signals in the AHAAH model. The results showed that the ARUs increased monotonically with the peak pressure (both P + and P- ) increasing. With increasing of the time duration, the ARUs increased first and then decreased, and the peak of ARUs appeared at about t = 0.2 ms (for both t+ and t- ). In addition, the auditory hazard of experimental measured impulse noises signals demonstrated a monotonically increasing relationship between ARUs and system voltages.
Download or read book Characterization of Impulse Noise and Hazard Analysis of Impulse Noise Induced Hearing Loss Using AHAAH Modeling written by Qing Wu (‡e author) and published by . This book was released on 2014 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: Millions of people across the world are suffering from noise induced hearing loss (NIHL), especially under working conditions of either continuous Gaussian or non-Gaussian noise that might affect human's hearing function. Impulse noise is a typical non-Gaussian noise exposure in military and industry, and generates severe hearing loss problem. This study mainly focuses on characterization of impulse noise using digital signal analysis method and prediction of the auditory hazard of impulse noise induced hearing loss by the Auditory Hazard Assessment Algorithm for Humans (AHAAH) modeling. A digital noise exposure system has been developed to produce impulse noises with peak sound pressure level (SPL) up to 160 dB. The characterization of impulse noise generated by the system has been investigated and analyzed in both time and frequency domains. Furthermore, the effects of key parameters of impulse noise on auditory risk unit (ARU) are investigated using both simulated and experimental measured impulse noise signals in the AHAAH model. The results showed that the ARUs increased monotonically with the peak pressure (both P + and P- ) increasing. With increasing of the time duration, the ARUs increased first and then decreased, and the peak of ARUs appeared at about t = 0.2 ms (for both t+ and t- ). In addition, the auditory hazard of experimental measured impulse noises signals demonstrated a monotonically increasing relationship between ARUs and system voltages.
Download or read book Study on Human Auditory System Models and Risk Assessment of Noise Induced Hearing Loss written by Won Joon Song and published by . This book was released on 2010 with total page 269 pages. Available in PDF, EPUB and Kindle. Book excerpt: Simulation-based study of human auditory response characteristics and development of a prototype for advanced noise guideline are two major focuses of this dissertation research. This research was conducted as a part of the long-term effort to develop an improved noise guideline for better protection of the workers exposed to various noise environments. The human auditory responses were studied with simulation models. A human full-ear model derived from an existing model, Auditory Hazard Assessment Algorithm for Human (AHAAH), was utilized as a baseline for the study. Frequency- and time-domain responses of well-known human middle ear network models were cross-compared to estimate expected accuracy of the models and understand their proper use. Responses of the stapes to impulsive noises were investigated by using the middle ear models to understand the effects of the temporal characteristics of impulsive noises on the responses. Available measured transfer functions between the free-field pressure and the stapes response for human and chinchilla were also used to study the auditory response characteristics. The measured transfer functions were refined and reconditioned to make them have equivalent formats. Using the reconstructed transfer functions, time-domain stapes responses of human and chinchilla to impulsive and complex type noises were calculated and compared. Applicability of the noise metrics defined in terms of the stapes response to assess the risk of the noise induced hearing loss was studied. A prototype of an improved noise guideline was developed from existing chinchilla noise exposure data. Applying a new signal processing technique to the time histories of the exposed noises and studying the relationship between the noise metric and the permanent threshold shift (PTS), the dose-response relationship (DRR) was established in a compatible way with the definition used in current human noise guidelines. From the DDR, noise induced hearing loss (NIHL) threshold is estimated as a function of frequency. An advanced noise guideline that enables quantitative, frequency by frequency assessment of risk of the noise was developed by utilizing the identified NIHL threshold. The guideline was developed so that it can be easily transformed to a human noise guideline. Therefore, the guideline serves as a prototype of a future human noise guideline.
Download or read book Noise induced Hearing Loss written by Armand L. Dancer and published by . This book was released on 1992 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Noise and Blasts written by Hans M. Borchgrevink and published by . This book was released on 1991 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Controlling Impulse Noise Hazards Programmatic Model for Developing Validated Exposure Standards written by and published by . This book was released on 1986 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: Blast producing weapons such as artillery cannons, mortars, and rockets can produce serious hearing loss among combat troops. Effective control of the risks of hearing loss requires realistic, valid standards for noise hazard evaluation and materiel design. Unfortunately, current Army standards for impulse noise are neither founded on a thorough scientific database nor validated for operational scenarios. These limitations make it difficult to balance the requirement for improved weapons against the need to protect crewmembers' hearing. In support of the Army's Health Hazard Assessment Program, A multiphase research model has been developed to provide a scientific foundation for valid impulse noise standards. The model constitutes a blueprint of the programmatic building blocks required to achieve the ultimate goal of realistics, effective standards applicable to a broad spectrum of weapons. Laboratory and field research methods are used to establish a systematic, comprehensive database relating auditory injury to critical noise parameters. The model culminates in validation of new standards under realistic field conditions. The new noise exposure standards can be translated into hearing conservation standards, materiel design standards, and noise hazard assessment procedures.
Download or read book Using the Auditory Hazard Assessment Algorithm for Humans AHAAH Software Beta Release W93e written by and published by . This book was released on 2009 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Auditory Hazard Analysis Algorithm for Humans (AHAAH) calculates the risk to human hearing of impulse noises, such as gunfire or airbag deployment. It achieves this by modeling the effects of the sound pressure wave from the free field, through the middle ear, and into the inner ear. The output of the algorithm is the number of auditory risk units (ARUs) associated with exposure to the given impulse sound. ARUs predict hearing damage; values over 500 ARUs for a 24-h exposure are likely to produce permanent hearing loss. The algorithm is implemented in computer software. This report is a user's manual for the AHAAH software release W93e.
Download or read book Characterization of Impulse Noise and Analysis of Its Effects Upon Correlation Receivers written by Jerry Don Moore and published by . This book was released on 1972 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NIOSH Publications on Noise and Hearing written by National Institute for Occupational Safety and Health and published by . This book was released on 1991 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Basic and Applied Aspects of Noise Induced Hearing Loss written by Richard J. Salvi and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 655 pages. Available in PDF, EPUB and Kindle. Book excerpt: In September 1985, NATO sponsored an Advanced Study WOl'kshop entitled, "Noise-Induced Hearing Loss: Basic and Applied Aspects." Tne meeting was held in a mountain retreat near Lucca, Italy and was attended by scientists, clinicians, and public officials from 12 countries. This was the third in a series of such conferences organized by the authors. The first two were supported by the United States National Institute of Occupational Safety and Health; their proceedings were published as "The Effects of Noise on Hearing" in 1976 and "New Perspectives on Noise-Induced Hearing Loss" in 1982. The Organizing Committee approached NATO because it was felt that the problem of noise was common to all industrialized countries and was an especially serious problem for the military. Thus, the NATO sponsorship and the Italian site of the meeting were part of the Organizing Committee's plan to obtain an international and thorough repr'esentation on the problem of noise-induced hearing loss. The NATO meeting and proceedings followed the format of the previous two symposia with an initial focus on the anatomical and physiological disturbances resulting from noise-induced hearing loss. This was followed by sections devoted to studies of a more applied nature involving general auditory performance in noise, issues associated with the establishment of noise-exposure criteria, nonauditory effects of noise, and the interaction of noise with other agents.
Download or read book Damage Risk from Impulse Noise written by and published by . This book was released on 2000 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication comprises papers from an RTO Lecture Series on Damage Risk From Impulse Noise. High-level impulse noise (weapons noise) can cause auditory as well as non-auditory damage, which may limit combat effectiveness and may result in communication impairments as a consequence of noise-induced hearing loss. Recent research has shown that the present damage risk criteria have to be adjusted. This has major implications for the protective measures that have to be taken when using weapon systems. Protection equipment can be very effective when properly used, but everyday practice shows that the results in the field fall short of what could be achieved. In addition, hearing protection may interfere with communication. New developments in the design of hearing protectors: level dependent, active noise reduction show how the protection and communication requirements can be combined and satisfied. Educational programs, emphasizing the new developments, may help to improve the effectiveness of hearing conservation and reduce the number of non-auditory accidents. Topics covered by individual papers are: techniques and procedures for the measurement of impulse noise; a draft ANSI standard on auditory risk criteria; performance of hearing protectors; communication and localization with hearing protectors; individual susceptibility to noise-induced hearing loss; new perspectives in the treatment of acute noise trauma; cost effectiveness of hearing conservation programmes; non-auditory damage risk assessment for impulse noise.
Download or read book Use of Animal Test Data in the Development of a Human Auditory Hazard Criterion for Impulse Noise Part 1 written by and published by . This book was released on 1997 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hearing loss and sensory cell loss data, obtained from 909 chinchillas exposed to one of 137 different impulse noise or blast wave exposure paradigms, were statistically analyzed. The objective was to extract relations between the effects of the exposure on the auditory system (effects metrics) and metrics used to characterize the blast wave exposure. Specifically the following two questions were asked: (a) What is the best indicator of the amount of hazard associated with an impulse noise exposure? (b) How does the hazard of an impulse noise exposure accumulate with increasing numbers of impulses? Two analytical approaches were used. Both approaches indicated that the P-weighting functions or one of its derivatives (P1-, P2- or R-weighting) best organized the effects metrics. Depending on the analytical approach, either an energy trading rule of 10 log(10) N or 6 log(10) N; where N is the number of impulses, best organized the data for N between 10 and 100. For exposures of between 1 and 10 impulses, a region of the parametric space that is of considerable practical significance, there is insufficient data to form any conclusions. For this region the limited data suggest that an energy trading rule i.e., 10 log N, does not work.
Download or read book The Handbook of Hearing and the Effects of Noise written by Kryter and published by BRILL. This book was released on 2023-12-11 with total page 687 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contains information on the fundamentals of hearing and sound physics. This book offers a review of research findings and concepts on the effects of noise on people. It focuses on the psychological and physiological affects of noise on hearing and performance. It explains the interrelations of various factors involved in making noise a problem.
Download or read book New Perspectives on Noise induced Hearing Loss written by Roger P. Hamernik and published by Lippincott Williams & Wilkins. This book was released on 1982 with total page 562 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Development and Validation of New Models and Metrics for the Assessments of Noise induced Hearing Loss written by Wisam Subhi Talib Al-Dayyeni and published by . This book was released on 2019 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: Noise-induced hearing loss (NIHL) is one of the most common illnesses that is frequently reported in the occupational and military sectors. Hearing loss due to high noise exposure is a major health problem with economic consequences. Industrial and military noise exposures often contain high-level impulsive noise components. The presence of these impulsive noise components complicates the assessment of noise levels for hearing conservation purposes. The current noise guidelines use equal energy hypothesis (EEH) based metrics to evaluate the risk of hearing loss. A number of studies show that the current noise metrics often underestimates the risk of hearing loss in high-level complex noise environments. The overarching goal of this dissertation is to develop advance signal processing based methods for more accurate assessments of the risk of NIHL. For these assessments, various auditory filters that take into account the physiological characteristics of the ear are used. These filters will help to understand the complexity of the ear's response to high-level complex noises. In this study, the F-weighting and the fatigue model are evaluated using animal noise exposure data. The results show that both the F-weighting and the fatigue model demonstrate better correlations with the hearing loss indicators compared with conventional noise metrics. Also, the dual resonance nonlinear filter and the rounded-exponential filter are applied to develop the velocity excitation pattern and the loudness excitation pattern. The results show that both excitation patterns can potentially be used as noise hazardous level indexes for the assessment of NIHL. Moreover, six noise metrics derived from six different auditory models are developed based on excitation patterns to assess NIHL. The designed noise metrics are evaluated by their correlations with chinchilla noise exposure data. The results show that the developed metrics have better correlation with hearing loss assessment compared to conventional metrics.
Download or read book Noise Induced Hearing Loss written by Colleen G. Le Prell and published by Springer Science & Business Media. This book was released on 2011-10-30 with total page 377 pages. Available in PDF, EPUB and Kindle. Book excerpt: Exposure to loud noise continues to be the largest cause of hearing loss in the adult population. The problem of NIHL impacts a number of disciplines. US standards for permissible noise exposure were originally published in 1968 and remain largely unchanged today. Indeed, permissible noise exposure for US personnel is significantly greater than that allowed in numerous other countries, including for example, Canada, China, Brazil, Mexico, and the European Union. However, there have been a number of discoveries and advances that have increased our understanding of the mechanisms of NIHL. These advances have the potential to impact how NIHL can be prevented and how our noise standards can be made more appropriate.
Download or read book Qualitative Cusp Catastrophe Risk Based Model for Describing Noise Induced Hearing Loss written by Salvatore Sebastiano Gambacorta and published by . This book was released on 2022-09-30 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this monograph is to describe the dynamics of Noise Induced Hearing Loss (NIHL) in terms of the Cusp Catastrophe Model. The wide application of catastrophe theory began after the work of Rene Thom in the 1960s, where it was applied to the study of biological morphogenesis. Since then catastrophe theory has been applied to many nonlinear phenomena in fields as diverse as medicine, finance, engineering, psychology, linguistics, sociology and theoretical physics. Significantly, whilst Newtonian mechanics describes smooth, continuous, processes very well, catastrophe theory is useful in providing a method for modelling dynamic nonlinear systems that involve discontinuous transitions of state. In this regard, the author provides an introduction to catastrophe theory building into the model from fundamental principles such as that of phase-spaces and bifurcations. The model is also providedfrom a qualitative risk management perspective, in terms of distal and proximal risk factors. In this regard, this paper introduces the concepts of the impulse noise cascade and arc and auditory adaptive cycles, whilst describing the bimodality of hearing deterioration vs recovery, proximal and distal risk divergence, and threshold shift hysteresis.
