This paper has exploited a new acoustic sensor method for determining moving acoustic wave loads from the structural responses through an inverse process. This new method is completely different from the principle of conventional acoustic wave sensors which use certain piezoelectric materials to generate the acoustic wave. Specifically, a beam structure with elastic foundation supports acting as a sensor configuration is studied. The time-domain response of an Euler–Bernoulli beam supported by an elastic foundation and excited by a traveling sinusoidal excitation is obtained based on an assumed basis function approach and by the finite element method. Moving wave loads are well identified in the time domain through an inverse process with the help of the Tikhonov regularization technique to solve ill-conditioned problems. To evaluate the method and examine various configurations, various levels of random noise are added to the simulated displacements and velocities to study the effect of noise in moving wave load identification. In addition, some of the configuration parameters of interest include the beam material, geometry, and thickness, and the elastic foundation properties. Results obtained from the simulations show that this sensor configuration can be effective in identifying moving wave loads.
In this paper, a new beam shape function configuration method for determining transient responses of a finite Euler-Bernoulli beam with two intermediate supports excited by moving pressure wave loads is developed. To clarify this method, this beam structure is excited by the moving sinusoidal loads as an example. Transient responses of this beam structure are investigated and verified by the traditional finite element method. This method can be used to solve transient response problems of moving pressure loads exciting the beam structure with intermediate support. Actually it can be extended to solve other complicated beam structure problems.
Because axons serve as the conduit for signal transmission within the brain, research related to axon damage during brain injury has received much attention in recent years. Although myelinated axons appear as a uniform white matter, the complex structure of axons has not been thoroughly considered in the study of fundamental structural injury mechanisms. Most axons are surrounded by an insulating sheath of myelin. Furthermore, hollow tube-like microtubules provide a form of structural support as well as a means for transport within the axon. In this work, the effects of microtubule and its surrounding protein mediums inside the axon structure are considered in order to obtain a better understanding of wave propagation within the axon in an attempt to make progress in this area of brain injury modeling. By examining axial wave propagation using a simplified finite element model to represent microtubule and its surrounding proteins assembly, the impact caused by stress wave loads within the brain axon structure can be better understood. Through conducting a transient analysis as the wave propagates, some important characteristics relative to brain tissue injuries are studied.
A continuous structure has several response characteristics that make it a good candidate for a sensor to be used in locating an acoustic source. In this paper, based on a beam structure with simple supports on both ends, the response of the structure to transient sinusoidal wave excitations is examined analytically and also verified by a finite element method (FEM). For sensor configuration on this structure, various interesting parameters such as the aperture of the structure, material properties, and thickness are examined by evaluating their effects on structure displacement responses. Results will be used for acoustic wave identification in the future.
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