About

Dean Capone is an Associate Research Professor affiliated with the Applied Research Laboratory and the Acoustics Center for Acoustics and Vibration at Penn State University. He is part of the Graduate Program in Acoustics, which was founded in 1965 and is recognized as a leading resource for graduate education in acoustics in the United States. His research focuses on acoustics, and he is involved in interdisciplinary work within the College of Engineering. He can be contacted via email at dec5@psu.edu and by phone at 814-863-3027. His departmental and personal website provide additional information about his academic and research activities.

Research topics

• Mechanics
• Materials science
• Physics
• Composite material
• Optics

Selected publications

• Measurement of turbulent boundary layer unsteady wall pressures beneath elastomer layers of various thicknesses on a plate

  Noise Control Engineering Journal · 2021

  • Materials science
  • Composite material
  • Optics

  The attenuation of turbulence-inducedwall pressure fluctuations through elastomer layers is studied experimentally and analytically. Wall pressure statistics are measured downstream from a backward facing step, with no elastomer present and beneath 2-, 3- and 4-mm-thick elastomers in a water tunnel facility. In the absence of an elastomer layer, the wall pressure spectra, cross-spectra and velocity statistics measured at the various locations downstream from the backward facing step are in excellent agreement with those reported in the archival literature. The streamwise coherence measured beneath the elastomer layers is higher than that measured in the absence of an elastomer layer, an effect which increases with increasing elastomer thickness. It is speculated that this increase in coherence level is due to the ability of the elastomer to support shear stresses, which effectively increases the area over which an eddy influences the normal stresses measured by the pressure sensors. The high-frequency filtering of the elastomers is also observed in the coherence at the smallest streamwise separation. The attenuation of the turbulent boundary layer wall pressure fluctuations through the elastomer layer using an analytical elastomer transfer function is in excellent agreement with the attenuation measured experimentally through all thicknesses of elastomer and at all the free stream velocities at which the experiments are performed.

  PublisherDOI

• Evaluation of bolt torque levels using nonlinear wave modulation spectroscopy

  AIP conference proceedings · 2019-01-01

  articleOpen accessSenior author

  Nondestructive evaluation techniques have been used to evaluate the integrity of bolted joints in structures. One such method is nonlinear wave modulation spectroscopy (NWMS), which examines the sideband generation in the presence of dual inputs as a result of nonlinearity present in the system. This work uses NWMS on an aluminum T-joint structure to evaluate the torque levels of the bolts. In addition, this work compares excitation with two shakers to excitation with a single shaker and an impact hammer, in which the hammer excites several low frequency modes. The results show that the damage indicator based on the sidebands is highly dependent on damage and sensor location, and that the damage indicator is most sensitive over a specific range of torque levels.

  PublisherOA PDFDOI

• Development of a perforated plate underwater acoustic ground cloak

  The Journal of the Acoustical Society of America · 2019-10-01 · 15 citations

  article

  One of the commonly investigated transformation acoustic device is the ground cloak, which conceals a scattering object on a reflecting surface. Multiple studies have numerically simulated acoustic ground cloaks, but because of the challenges associated with realizing a homogeneous anisotropic metamaterial, only two acoustic ground cloaks have been built and tested. Perforated plastic plates in air were used to construct two and three dimensional ground cloaks and alternating layers of brass and water were used to construct an extended area ground cloak underwater. With underwater mass density anisotropy previously demonstrated for perforated steel plates, the primary focus of this article is to build and evaluate an underwater ground cloak with perforated steel plates. The cloak was evaluated at a water-air pressure release reflecting surface. The cloak successfully concealed the scattering object over a broad frequency range of 7-12 kHz.

  PublisherDOI

• Measurement of turbulent boundary layer unsteady wall pressures beneath elastomer layers of various thicknesses on a plate

  The Journal of the Acoustical Society of America · 2019-10-01

  article

  The attenuation of turbulence induced wall pressure fluctuations through elastomer layers was studied experimentally and analytically. Wall pressure statistics were measured downstream from a backward facing step, with no elastomer present and beneath 2, 3, and 4 mm thick elastomers in a water tunnel facility. The step height, h, was 0.635 cm, and the wall pressures were measured at non-dimensional distances of x/h = 10, 24, 36 and 54 downstream from the step. The attenuation of the wall pressure spectra beneath the elastomer layers that was measured experimentally was then compared to analytical model predictions. An analytical elastomer transfer function, which models the transfer of turbulent boundary layer wall pressures on the surface of an elastomer to the normal stresses through the elastomer, was applied to the turbulent boundary layer wall pressure spectra measured in the absence of an elastomer layer and compared to spectra measured beneath the 2, 3, and 4 mm thick elastomers. The attenuation of the turbulent boundary layer wall pressure spectra through the elastomer layer using the analytical elastomer transfer function was in excellent agreement with the attenuation measured experimentally through all thicknesses of elastomer and at all free stream velocities at which the experiments were performed.

  PublisherDOI

• Metamaterial characterization for acoustic cloaking applications

  2018-01-01

  articleSenior author

• Underwater acoustic ground cloak development and demonstration

  The Journal of the Acoustical Society of America · 2018-03-01 · 3 citations

  articleSenior author

  Acoustic ground cloaks, which conceal an object on a rigid surface, utilize a linear coordinate transformation to map the flat surface to a triangular void by compressing space into two triangular cloaking regions consisting of a homogeneous anisotropic acoustic metamaterial. Transformation acoustics allows for the realization of a coordinate transformation through a reinterpretation of the scale factors as a new material in the original coordinate system. An underwater acoustic ground cloak was constructed from perforated steel plates and experimentally tested to conceal an object on a pressure release surface. The perforated plate acoustic ground cloak successfully cloaked the scattered object. There was excellent agreement between the phase of the surface reflection and cloak reflection with a small amplitude difference. Above 15 [kHz], the cloaking performance decreased as the effective material parameters of the perforated plate metamaterial deviated from the required material parameters.

  PublisherDOI

• Development of a multi-material underwater anisotropic acoustic metamaterial

  The Journal of the Acoustical Society of America · 2017-05-01 · 1 citations

  articleSenior authorCorresponding

  Previous work in the open literature has described three potential ways to create an acoustic metamaterial with anisotropic mass density and isotropic bulk modulus: (1) alternating layers of homogeneous isotropic materials, (2) perforated plates, and (3) solid inclusions. The primary focus of this work will be to experimentally demonstrate the anisotropic behavior of a metamaterial comprised of a multi-solid inclusion unit cell in water. The two material design of the unit cell consists of one material more dense and one less dense than the background fluid, which results in an effective mass density tensor for the unit cell where one component is more dense and one component is less dense than the background fluid. Successful demonstration of an anisotropic metamaterial with these effective parameters is an important step in the development of structures based on transformational acoustics.

  PublisherDOI

• Measurement of the unsteady lift of thick airfoils in incompressible turbulent flow

  Journal of Fluids and Structures · 2016-08-20 · 29 citations

  article
  PublisherDOI

• Wave propagation through additive manufactured phononic crystals

  The Journal of the Acoustical Society of America · 2016-04-01 · 1 citations

  articleSenior author

  Obtaining the effective parameters is an important step in designing a unit cell for a variety of metamaterial applications. The effective parameters including the density and bulk modulus govern how a wave propagates through a medium constructed from unit cells. Additive manufacturing has created the potential to change the static density of materials by encapsulating metallic powder inside the produced component. This work will use modal analysis to extract the bulk modulus from additive manufactured rods. After the material properties are determined, numerical and experimental results will be compared for wave propagation through a phononic crystal constructed from additive manufactured rods of different densities.

  PublisherDOI

• Wave propagation through additive manufactured materials-Working toward a realizable anistropic unit cell

  2016-01-01

  article

Frequent coauthors

• William K. Bonness

  Pennsylvania State University

  27 shared

• Stephen A. Hambric

  HEAD Acoustics (Germany)

  14 shared

• Timothy A. Brungart

  Pennsylvania State University

  13 shared

• Robert L. Campbell

  University of Strathclyde

  10 shared

• Amanda Hanford

  Pennsylvania State University

  10 shared

• Gerald C. Lauchle

  Pennsylvania State University

  9 shared

• Peter Kerrian

  ATA Engineering (United States)

  8 shared

• John B. Fahnline

  Pennsylvania State University

  7 shared