Diego Turo, Ph.D. Headshot


  • Mechanical Engineering
  • School

  • School of Engineering
  • Expertise

  • Physical Acoustics
  • Computational Acoustics
  • Sound propagation modeling
  • Atmospheric Acoustics
  • Acoustics of porous media
  • Acoustic imaging
  • Ultrasonic tissue characterization
  • Shear wave elastography
  • Languages

  • Italian
  • Publications

    • Airgun inter-pulse noise field during a seismic survey in an Arctic ultra shallow marine environment

      Offshore oil and gas exploration using seismic airguns generates intense underwater pulses that could cause marine mammal hearing impairment and/or behavioral disturbances. However, few studies have investigated the resulting multipath propagation and reverberation from airgun pulses. This research uses continuous acoustic recordings collected in the Arctic during a low-level open-water shallow marine seismic survey, to measure noise levels between airgun pulses. Two methods were used to quantify noise levels during these inter-pulse intervals. The first, based on calculating the root-mean-square sound pressurelevel in various sub-intervals, is referred to as the increment computation method, and the second, which employs the Hilbert transform to calculate instantaneous acoustic amplitudes, is referred to as the Hilbert transform method. Analyses using both methods yield similar results, showing that the inter-pulse sound field exceeds ambient noise levels by as much as 9 dB during relatively quiet conditions. Inter-pulse noise levels are also related to the sourcedistance, probably due to the higher reverberant conditions of the very shallow water environment. These methods can be used to quantify acoustic environment impacts from anthropogenic transient noises (e.g., seismic pulses, impact pile driving, and sonar pings) and to address potential acoustic masking affecting marine mammals.

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    • Novel Use of Ultrasound Elastography to Quantify Muscle Tissue Changes After Dry Needling of Myofascial Trigger Points in Patients With Chronic Myofascial Pain

      Objectives—To compare a mechanical heterogeneity index derived from ultrasound vibration elastography with physical findings before and after dry-needling treatment of spontaneously painful active myofascial trigger points in the upper trapezius muscle.

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    • Dynamics of soundscape in a shallow water marine environment: A study of the habitat of the Indo-Pacific humpback dolphin

      The underwater acoustic field is an important ecological element for many aquatic animals. This research examines the soundscape of a critically endangered Indo-Pacific humpback dolphin population in the shallow waterenvironment off the west coast of Taiwan. Underwater acoustic recordings were conducted between late spring and late fall in 2012 at Yunlin (YL), which is close to a shipping lane, and Waisanding (WS), which is relatively pristine. Site-specific analyses were performed on the dynamics of the temporal and spectral acoustic characteristics for both locations. The results highlight the dynamics of the soundscape in two major octave bands: 150–300 Hz and 1.2–2.4 kHz. The acoustic energy in the former frequency band is mainly associated with passing container vessels near YL, while the latter frequency band is from sonic fish chorus at nighttime in both recording sites. In addition, large variation of low frequency acoustic energy throughout the study period was noticed at WS, where the water depths ranged between 1.5 and 4.5 m depending on tidal cycle. This phenomenon suggests that besides certain sound sources in the environment, the coastal soundscape may also be influenced by its local bathymetry and the dynamics of the physical environment.

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    • Influence of Forchheimer's nonlinearity and transient effects on pulse propagation in air saturated rigid granular materials

      It has been shown in the earlier work of Umnova et al. [Noise Control Eng. 50, 204–210 (2002)] that interaction of a relatively long, high amplitude acoustic pulse with a rigid porous material can be accurately described accounting for the Forchheimer nonlinearity. In the present study, the goal is to determine whether the accuracy of the modeling can be improved in the case of a lower amplitude and a shorter pulse. A model that accounts for the Forchheimer's nonlinearity and the transient effects is developed. It is assumed that all the contributions to the viscous force are additive in the time domain. The governing equations are solved numerically using finite difference time domainscheme. The results are compared with the data for two granular materials. The latter are obtained in an impedance tube and in a shock tube experiments, where acoustic pulses with various amplitudes and durations are generated.

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