E-Thesis 127 views 44 downloads
Experimental and Analytical Demonstration of Inertial Amplifier Concepts / EMILY NAR
Swansea University Author: EMILY NAR
Abstract
An inertial amplifier is a dynamic tuning device, which works to increase the effective mass of a resonator without proportionally augmenting the physical mass of the system. This thesis presents six inertial amplifier mechanisms, namely the single-stage, single-stage truss, compound, compound truss...
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Swansea, Wales, UK
2023
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| Institution: | Swansea University |
| Degree level: | Master of Research |
| Degree name: | MSc by Research |
| Supervisor: | Shaw, Alex D. and Adhikari, Sondipon. |
| URI: | https://cronfa.swan.ac.uk/Record/cronfa65369 |
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| Abstract: |
An inertial amplifier is a dynamic tuning device, which works to increase the effective mass of a resonator without proportionally augmenting the physical mass of the system. This thesis presents six inertial amplifier mechanisms, namely the single-stage, single-stage truss, compound, compound truss, nested, and nested truss inertial amplifiers. The configuration of each inertial amplifier is conceived through a series of link-bar mechanisms. Based on the configurations of each inertial amplifier, the kinematic relationships and the equations of motion are derived. The analytical analysis demonstrates that through geometrical adjustments, and proof mass alterations to each system, it is possible to manipulate the effective mass of each system, respectively. To support the analytical analysis, an experimental demonstration of each inertial amplifier is provided, whereby a series of electrodynamic shaker tests are conducted. These tests assess the pure mass effects of each inertial amplifier, the behaviour of a cantilever beam, and the impact of the single-stage, single-stage truss, compound and compound truss inertial amplifiers on the dominant single-degree-of-freedom mode of the cantilever beam. Through frequency response plots it is shown that the single-stage, single-stage truss, compound, and compound truss inertial amplifiers, all have the ability to enhance the effective mass characteristics of the cantilever beam, thereby causing changes to its the underlying natural frequency, damping ratio, and Q-factor properties. The inertial amplifiers presented in this paper, provide a step improvement for applications that require dynamic tuning. |
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| Keywords: |
Dynamic Response, Effective Mass, Inertial Amplifier, Natural Frequency, Single-Degree-of-Freedom System, Vibration Control |
| College: |
Faculty of Science and Engineering |