As a first step in more accurately investigating the performance of a fixture designed for targeted RFID tag communication coupled with an energy harvesting application, this paper analyzes the dynamic features of a higher-order beam based on Reddy-Levinson theory. The beam element is a necessary design feature of the experimental fixture. Specifically, understanding the mechanical feature’s properties, including its dynamic response, is an important step in the analysis and deign of both the element and the resulting fixture since it provides information about the maximum voltage and current extractable from an energy harvester. In other words, the efficacy of a proposed energy harvester element can be verified by means of mechanical analysis of the beam element. In this regard, the vibration response of a rotating electro-mechanical system based on continuum mechanics, coupled with displacement field and Reddy-Levinson beam theories (RLBT) provides the scientific underpinning of this paper. RLBT is used to obtain more precise level of accuracy incorporating shear deformations and a coupled displacement field is utilized to constrain translational and rotational movements of the system based on a linear constraint equation. Using coupled displacement field theory results in an additional kinetic energy due to rotations. It is good to mention that translational and rotational displacements are assumed to be coupled to each other. The proposed beam model has pinned-pinned type of boundary conditions. Hamilton’s principle is utilized to derive a coupled system of governing equations of motion. Due to the symmetric type of boundary conditions, harmonic displacement field functions fit to the lateral and rotational displacement fields. Consequently, Navier method is adopted as a numerical method to discretize the continuous system and to solve the un-coupled system of motion equations, respectively. Results reveal the significance of dynamic features of the proposed model coupled to the RF communicating system for the purpose of minimizing energy usage. Furthermore, the effect of the slenderness ratio in such a system has been investigated. Current results are compared and verified with available benchmarks, to confirm a satisfactory level of accuracy. The proposed model, which is based on a coupled displacement field, can also be used to design other types of energy harvesters; e.g., more efficient gyroscopes and piezoelectric energy harvesters. In other words, in an energy-scavenging system, a fundamental understanding of dynamic features and the response of the harvester element can be accomplished through the presented analysis, highlighting notable factors in the system response and the most extractable energy within the system to empower RF element energy resources.

 


Energy Resource for a RFID System Based on Dynamic Features of Reddy-Levinson Beam

Division / Sponsors: 
Aerospace, Bioengineering, Applied Mechanics, Design Engineering Division, Advanced Energy Systems, Manufacturing Engineering Division, Noise Control and Acoustics, Nondestructive Evaluation, Diagnosis, and Prognosis (NDPD), Nuclear Engineering Division, Process Industries Division, Fluids Engineering, Heat Transfer, Materials, Microelectromechanical Systems, Safety Engineering and Risk Analysis, Computers & Information in Engineering


Paper Proceedings: https://asmedigitalcollection.asme.org/IMECE/IMECE2020/volume/84478

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