Vibration control in cricket bats using piezoelectric-based smart materials

Cao, J 2006, Vibration control in cricket bats using piezoelectric-based smart materials, Doctor of Philosophy (PhD), Aerospace, Mechanical and Manufacturing Engineering, RMIT University.

Document type: Thesis
Collection: Theses

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Title Vibration control in cricket bats using piezoelectric-based smart materials
Author(s) Cao, J
Year 2006
Abstract The vibrations of a Cricket bat are traditionally passively damped by the inherent damping properties of wood and flat rubber panels located in the handle of the bat. This sort of passive damping is effective for the high frequency vibrations only and is not effective for the low frequency vibrations. Recently, the use of Smart materials for vibration control has become an alternative to the traditional vibration control techniques which are usually heavy and bulky, especially at low frequencies. In contrast, the vibration controls with Smart materials can target any particular frequency of vibration. This has advantages such as it results in smaller size, lighter weight, portability, and flexibility in the structure. This makes it particularly suitable for traditional techniques which cannot be applied due to weight and size restrictions.

This research is about the study of vibration control with Smart materials with the ultimate goal to reduce the vibration of the Cricket bat upon contact with a Cricket ball. The study focused on the passive piezoelectric vibration shunt control technique. The scope of the study is to understand the nature of piezoelectric materials for converting mechanical energy to electrical energy and vice versa. Physical properties of piezoelectric materials for vibration sensing, actuation and dissipation were evaluated. An analytical study of the resistor-inductor (R-L) passive piezoelectric vibration shunt control of a cantilever beam was undertaken. The modal and strain analyses were performed by varying the material properties and geometric configurations of the piezoelectric transducer in relation to the structure in order to maximize the mechanical strain produced in the piezoelectric transducer. Numerical modelling of structures was performed and field-coupled with the passive piezoelectric vibration shunt control circuitry. The Finite Element Analysis (FEA) was used in order for the analysis, optimal design and for determining the location of piezoelectric transducers. Experiments with the passive piezoelectric vibration shunt control of beam and Cricket bats were carried out to verify the analytical results and numerical simulations. The study demonstrated that the effectiveness of the passive piezoelectric vibration shunt control is largely influenced by the material properties of the structures to be controlled. Based on the results from simple beam evaluations, vibration reduction of up to 42% was obtained with the designed Smart Cricket bat. Finally, for the control circuit to automatically track the frequency shift of structures
required in real applications, an adaptive filter protocol was developed for estimating multiple frequency components inherent in noisy systems. This has immediate application prospects in Cricket bats.
Degree Doctor of Philosophy (PhD)
Institution RMIT University
School, Department or Centre Aerospace, Mechanical and Manufacturing Engineering
Keyword(s) Smart material
Vibration shunt
Frequency estimation
Version Filter Type
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Created: Fri, 26 Nov 2010, 14:00:46 EST
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