Dan Mennitt

Daniel J. Mennitt, Ph.D., P.E.

Managing Engineer
Mechanical Engineering
Denver
  • CV (English)
  • Contact Card

Dr. Mennitt specializes in acoustics and has expertise in the characterization, design, and modeling of acoustical environments and devices. He has over 15 years of experience in acoustics, environmental noise, and noise control and is a certified Occupational Hearing Conservationist. Dr. Mennitt leverages his experience to assist clients in the areas of noise and vibration control, auditory perception, nondestructive testing, and environmental noise.

Dr. Mennitt has worked extensively with federal agencies to assess environmental noise and the consequences of noise exposure to humans and ecological systems. Prior to joining Exponent, he worked in partnership with Colorado State University and the National Park Service’s Natural Sounds and Night Skies Division to manage acoustical environments. His research involved the spatiotemporal patterns of environmental sound on landscape scales, impacts of noise exposure, acoustical transducers, bioacoustics, and predictive modeling. Dr. Mennitt has designed acoustic devices for calibration as well as devices for monitoring sound in extremely quiet environments. Measurements in quiet environments are especially prone to contamination and his research utilized signal processing techniques and machine learning for flow noise reduction and robust data acquisition. He has also directed large environmental noise studies in urban areas.

Dr. Mennitt’s experience includes deterministic time and frequency domain simulations of acoustic propagation as well as statistical learning, predictive modeling and data mining. He led a multidisciplinary team to pioneer technology that uses geospatial data to generate comprehensive maps of environmental sound levels and noise exposure on national scales. He has worked with academia, government, and industry to translate these estimates to implications for land management, ecological, epidemiological, military, and commercial applications. Related research in underwater acoustics demonstrated the utility of passive acoustical monitoring and environmental data to predict trends in marine biodiversity. While at Colorado State University, Dr. Mennitt also lectured on acoustics, noise, and signal processing.

Dr. Mennitt’s background is in mechanical engineering. He performed his doctoral work at Virginia Tech’s Vibration and Acoustics Laboratory, investigating localization and tracking of acoustic sources in free-field and cluttered environments. During this research, he developed robust statistical methods for classification of acoustical signals and fusion of information from distributed sensor networks. He has also created tools for beamforming, adaptive filtering, speech processing, and other signal processing applications with free field and diffracting microphone arrays. While at the Vibration and Acoustics Laboratory, he conducted testing with anechoic and reverberation rooms, intensity probes, impedance tubes, modal impact hammers, accelerometers, and shakers. Other graduate work included studies in virtual acoustic prototyping, architectural acoustics, and audio engineering. His training and expertise in audio engineering helps Dr. Mennitt conduct educated and critical observations to address acoustical issues.

CREDENTIALS & PROFESSIONAL HONORS

  • Ph.D., Mechanical Engineering, Virginia Polytechnic Institute and State University, 2008, magna cum laude
  • B.S., Mechanical Engineering, Virginia Polytechnic Institute and State University, 2004, magna cum laude
  • The Robert Bradford Newman Medal for Merit in Architectural Acoustics, 2005

    Best Paper By A Young Presenter, 153rd Meeting of the Acoustical Society of America, 2007.

LICENSES & CERTIFICATIONS

Licensed Professional Engineer, Colorado, PE 58367

Occupational Hearing Conservationist (OHC), Council for Accreditation in Occupational Hearing Conservation, 503540

Publications

M. Senzaki, J. R. Barber, J. N. Phillips, N. H. Carter, C. B. Cooper, M. A. Ditmer, K. M. Fristrup, C. McClure, D. J. Mennitt, L. P. Tyrrell, J. Vukomanovic, A. A. Wilson and C. D. Francis, “Sensory pollutants alter bird phenology and fitness across a continent,” Nature 587 (2020):605-609.

D. Paksarian, K. E. Rudolph, E. K. Stapp, G. P. Dunster, J. He, D. J. Mennitt, and K. Merikangas, “Association of Outdoor Artificial Light at Night With Mental Disorders and Sleep Patterns Among US Adolescents,” JAMA Psychiatry 77 (2020):1266-1275.

DM Dominoni et. al., “Why conservation biology can benefit from sensory ecology,” Nature Ecology & Evolution, 4 (2020): 502-511.

R. T. Buxton, M.F. McKenna, D. J. Mennitt, E. Brown, K. Fristrup, K.R. Crooks, L. M. Angeloni, G. Wittemyer, “Anthropogenic noise in US national parks – sources and spatial extent,” Frontiers in Ecology and the Environment 17 (2020): 559-564.

D. J. Mennitt, “An adaptive coupler for the calibration of the arbitrarily shaped microphones,” Applied Acoustics 154 (2019):114-120.

K.E. Rudolph, A. Shev, D. Paksarian, K.R. Merikangas, D.J. Mennitt, P. James, and J. A. Casey, “Environmental noise and sleep and mental health outcomes in a nationally representative sample of urban US adolescents,” Environmental Epidemiology, 3 (2019): e056.

D. J. Mennitt, K. Fristrup, and B. Notaros, “Characterization of gain and directivity of exponential horn receivers,” The Journal of the Acoustical Society of America, 142 (2017):3257-3266.

C. D. Francis, D. Taff, P. Newman, C. White, C. A. Monz, M. Levenhagen, A. R. Petrelli, L. C. Abbott, J. Newton, S. Burson, C. B. Cooper, Kurt M. Fristrup, C. McClure, D. J. Mennitt, M. Giamellaro, J. R. Barber, “Acoustic Environments Matter: Synergistic benefits to humans and ecological communities,” Journal of Environmental Management, 203 (2017):245-254.

J. A. Casey, R. Morello-Frosch, D. J. Mennitt, K. M. Fristrup, E. L. Ogburn, and P. James, “Race/Ethnicity, Socioeconomic Status, Residential Segregation, and Spatial Variation in Noise Exposure in the Contiguous United States,” Environmental Health Perspectives, 125 (2017):1-10.

R. T. Buxton, M. F. McKenna, D. J. Mennitt, K. M. Fristrup, K. Crooks, L. Angeloni, and G. Wittemyer, “Noise pollution is pervasive in US protected areas.” Science 356, no. 6337 (2017):531-533.

D. J. Mennitt and K. Fristrup, “Influential factors and spatiotemporal patterns of environmental sound levels in the contiguous United States,” Noise Control Engineering Journal, 64 (2016):342-353.

D. J. Mennitt, K. Fristrup, and K. Sherrill, “A geospatial model of ambient sound pressure levels in the contiguous United States,” The Journal of the Acoustical Society of America 135 (2014):2746-2764.

D. J. Mennitt, K.M. Fristrup, “Obtaining calibrated sound pressure levels from consumer digital audio recorders,” Applied Acoustics 73 (2012):1138-1145.

K. M. Fristrup, and D. J. Mennitt. “Bioacoustical monitoring in terrestrial environments.” Acoustics Today 8(2012):16-24.

D. J. Mennitt, and M. Johnson, “Multiple-array passive acoustic source localization in urban environments,” The Journal of the Acoustical Society of America, 127.5 (2010): 2932-2942.

M. Ermann, M. R. F. Kidner, and D. J. Mennitt, “Mapping the sound field of a 400 seat theater,” Building Acoustics 13.3 (2006):199-210.

Conference Proceedings

D. J. Mennitt, M. F. McKenna, and K. M. Fristrup, “Continental perspectives of noise exposure and its effects,” INTER-NOISE and NOISE-CON Congress and Conference Proceedings, 255 (2017):1168-1172.

D. J. Mennitt and K. Fristrup, “Influential factors and spatiotemporal patterns of environmental sound levels,” INTER-NOISE and NOISE-CON Congress and Conference Proceedings, 250 (2015):2029-2040.

D. J. Mennitt, K. Fristrup, K. Sherrill, and L. Nelson, “Mapping sound pressure levels on continental scales using a geospatial sound model,” INTER-NOISE and NOISE-CON Congress and Conference Proceedings, 1 (2013):1-11.

D. J. Mennitt, P. Gillett, J. Carneal and M. Johnson, “Tracking Noise Sources Using Multiple Mobile Microphone Arrays,” Thirteenth International Congress on Sound and Vibration, Vienna, Austria (2006):1-8.

Technical reports

D. J. Mennitt and B. J. Ikelheimer, “Geospatial sound modeling for military and community noise metrics,” Prepared for the United States Army (2017).

Presentations

D.J. Mennitt, D. Joyce, and K. Fristrup, “Benefits and challenges of using consumer audio equipment for unattended acoustical monitoring,” The Journal of the Acoustical Society of America, 144, 1828 (2018).

J. A. Casey, A. Shev, D. Paksarian, K. R. Merikangas, D. J. Mennitt, and K. E. Rudolph, “Association between exposure to noise and sleep and mental health outcomes in a nationally-representative sample of U.S. adolescents,” 2018 Annual Conference of the International Society for Environmental Epidemiology (2018).

K. Fristrup, M.F. McKenna, and D.J. Mennitt, “Forecasting increases in recreational value that would result from restoration of natural soundscapes in National Parks,” The Journal of the Acoustical Society of America, 143, 1806 (2018).

M. F. McKenna, D. J. Mennitt, M. Thompson, J. Stanley, S. Van Parijs, K. M. Fristrup, and L. Hatch, “Including acoustical features in marine ecological prediction,” NOAA-Navy Workshop: Soundscape Metrics to Support Marine Protected Area Management, Woods Hole Oceanographic Institution, MA (2018).

D. J. Mennitt, “Classification of wind induced pseudo noise using low resolution features,” National Park Service, Natural Resource Stewardship and Science, Fort Collins, CO (2017).

D. J. Mennitt, Megan F. McKenna, and Kurt M. Fristrup, “Continental perspectives of noise exposure and its effects,” INTER-NOISE and NOISE-CON Congress and Conference Proceedings, 255 (2017):1168-1172.

D. J. Mennitt and K. Fristrup, “Gain and directivity of exponential horn receivers,” The Journal of the Acoustical Society of America 140, 3140 (2016).

D.J. Mennitt and K. Fristrup, “Anomaly detection and other practical considerations for estimating acoustical metrics from time series data,” The Journal of the Acoustical Society of America, 140, 3424 (2016).

D. J. Mennitt and K. M. Fristrup, “A geospatial approach to mapping environmental sound levels across the United States,” American Society for Photogrammetry and Remote Sensing, Geobytes (2016).

J. A. Casey, R. Morello-Frosch, D. J. Mennitt, K. M. Fristrup, and P. James, "The distribution of noise pollution along racial and socioeconomic lines in the United States," 28th Annual Conference of the International Society of Environmental Epidemiology, Rome, Italy (2016).

P. James, R. Banay, D. J. Mennitt, K. Fristrup, J. Africa, J. Hart, F. Laden, "Noise and Cardiovascular Disease in a Nationwide Cohort Study," 28th Annual Conference of the International Society of Environmental Epidemiology, Rome, Italy (2016).

R. T. Buxton, M. McKenna, E. Brown, D. J. Mennitt, K. Fristrup, K. Crooks, L. Angeloni, G. Wittemyer, “Noise Exposure in U. S. Protected Areas,” American Association for the Advancement of Science, Washington DC (2016).

D. J. Mennitt, L. Hatch, K. M. Fristrup, M. Thompson, D. Cholewiak, M. F. McKenna, P. Auster and S. Van Parijs, “A geospatial approach to exploring the soundscape of Stellwagen Bank National Marine Sanctuary,” Oceanoise 2015, Vilanova i la Geltrú, Spain (2015).

D. J. Mennitt, E. Brown, and K.M. Fristrup, “Assessing the condition of acoustical resources across the National Park Service Units,” 2015 George Wright Society Conference on Parks, Protected Areas, and Cultural Sites, Oakland, CA (2015).

M. F. McKenna, K. M. Fristrup, and D. J. Mennitt, “Predicting historic and current sound levels from point measurements: a geospatial model,” Science for Parks, Parks for Science: The Next Century, Berkeley, CA (2015).

K. Fristrup, D. Joyce, E. Lynch, M. Mckenna, D. J. Mennitt, “Monitoring and modeling sound levels at landscape scales in U. S. National Parks,” Ecology and acoustics: emergent properties from community to landscape, Paris, France (2014).

D. Risch, P. Auster, D. Cholewiak, K. Fristrup, L. Hatch, M. McKenna, D. Mennitt, M. Thompson, and S. Van Parijs, “Monitoring bio-acoustic activity & geospatial models of ambient sound: Applications in a marine sanctuary,” Ecology and acoustics: emergent properties from community to landscape, Paris, France (2014).

C. Walker, S. Buxner, D. J. Mennitt, C. Cooper, S. O’Connor, and S. M. Pompea, “Using NGSS to Shape Research Projects with Citizen-Science Data,” Astronomical Society of the Pacific Annual Meeting, Burlingame, California (2014).

D. J. Mennitt, K. Fristrup, and K. Sherrill, “A geospatial model of ambient sound pressure levels in the continental United States,” The Journal of the Acoustical Society of America 132, 1926 (2012).

D. J. Mennitt, "Spatial variation of natural ambient sound pressure levels in Rocky Mountain National Park." The Journal of the Acoustical Society of America 129, 2617 (2011). M. Ermann, J. Carneal, D. Mennitt, C. Jackson, B. Karmarkar, M. Helveston, and P. Clay, “Sound transmission loss of nontraditional building materials and redundancies,” The Journal of the Acoustical Society of America 122(5) (2007).

D. J. Mennitt, M. Johnson, and J. Carneal, “Coarse classification of acoustic signals using temporal and spectral characteristics,” Journal of the Acoustical Society of America 121(5):3046 (2007).

J. Carneal, M. Johnson, D. J. Mennitt, and P. Gillett, “Localization and tracking noise sources with autonomous vehicles: from node processing to central command fusion and tracking,” Acoustical Society of America's North Carolina Chapter, Raleigh, NC (2006).

D. J. Mennitt, “Numerical accuracy of virtual acoustic prototyping: determination of the minimum size of the evaluation sphere to achieve accurate local simulation,” Acoustical Society of America's North Carolina Chapter, Raleigh, NC (2006).

D. J. Mennitt, J. Redenshek, A. Tawney “Acoustical mapping of the lyric theater,” Acoustical Society of America's North Carolina Chapter, Blacksburg, VA (2005).

Patents

US Patent Application 16/390,965. Adaptive coupler for calibration of arbitrarily shaped microphones, published December 26, 2019.

Academic Appointments

Research Scientist III, Department of Electrical and Computer Engineering, Colorado State University, 2018-2019

Research Scientist II, Department of Electrical and Computer Engineering, Colorado State University, 2015-2018

Research Scientist I, Department of Electrical and Computer Engineering, Colorado State University, 2010-2015

Graduate Research Assistant, Department of Mechanical Engineering, Virginia Polytechnic Institute and State University, 2004-2008

Professional Affiliations

Acoustical Society of America

Institute of Noise Control Engineering

Project Experience

Environmental Noise

Assessed the potential for environmental impacts associated with noise from construction and operation of facilities.

Designed and conducted field surveys of existing ambient conditions.

Modeled acoustic propagation from noise sources to determine compliance with regulations and aid in permitting of new facilities.

Evaluated and recommended noise control strategies for projects in which mitigative measures were warranted.

Noise and Vibration Control Engineering

Evaluated occupational noise exposure and the efficacy of mitigative measures to protect employee hearing.

Assessed and modeled building HVAC noise to mitigate occupant annoyance.

Investigated a flow induced resonance in a steam pipeline and designed noise controls to reduce structural vibration.

Measured and analyzed meteorological, sound, and vibration data to determine the root cause of wind-induced sound and vibration of a transmission line.

Evaluated the effects of vibration on people and sensitive instruments using accelerometer data.

Auditory Perception, Sound Quality, and Consumer Products

Assessed the active and passive noise reduction performance of hearing protection devices.

Recreated and measured acoustic events to evaluate their subjective perception using psychoacoustic metrics such as time-varying loudness.

Evaluated characteristics of acoustic sources and environments to estimate audibility.

Analyzed the sound field of an automobile cabin to evaluate the auditory perception of the driver.

Reviewed patents for musical instruments and other devices.

Designed digital signal processing algorithms to analyze acoustic measurement data.

Nondestructive Testing and Machine Condition Monitoring

Developed protocols and instrumentation to assess the effect of vibration on nondestructive evaluation of gas pipelines that account for vibroacoustic interaction of shell and fluid dynamics.

Instrumented turbomachinery and analyzed condition monitoring data to identify component failure and determine maintenance requirements.

Conducted experimental modal analysis of vibrating structures to determine root cause of failure in conjunction with finite element analyses.

Measured the dynamics of lightweight structures using laser vibrometry to solve problems related to fatigue and NVH (noise, vibration, and harshness).

Additional Information

Peer Reviewer

Noise Control Engineering Journal

Journal of the Acoustical Society of America

Environment International Journal

IEEE Sensors Journal

CREDENTIALS & PROFESSIONAL HONORS

  • Ph.D., Mechanical Engineering, Virginia Polytechnic Institute and State University, 2008, magna cum laude
  • B.S., Mechanical Engineering, Virginia Polytechnic Institute and State University, 2004, magna cum laude
  • The Robert Bradford Newman Medal for Merit in Architectural Acoustics, 2005

    Best Paper By A Young Presenter, 153rd Meeting of the Acoustical Society of America, 2007.

LICENSES & CERTIFICATIONS

Licensed Professional Engineer, Colorado, PE 58367

Occupational Hearing Conservationist (OHC), Council for Accreditation in Occupational Hearing Conservation, 503540