Design and development of a multimodal self adjusting vibration energy harvesting system / Lim Chin Seong

Lim, Chin Seong (2021) Design and development of a multimodal self adjusting vibration energy harvesting system / Lim Chin Seong. Masters thesis, Univesiti Malaya.

	PDF (The Candidate’s Agreement) Restricted to Repository staff only Download (730Kb)
Preview	PDF (Thesis M.A) Download (15Mb) | Preview

Abstract

Vibration energy harveting devices have the potential to replace batteries in powering remote sensors. However,the bandwidth of such devices is typically very narrow, and thus. only abble to generate sufficient power when the excitation frequency is at the natural frequency of the device. This research aims to design, build and test the behavior of a antilever beam that has the capability to self-tune its natural frequency mechanically.The self-turning mechanism is designed based on the observation that vibration causes freely supported disc to rotate, and the mass distribution of an asymmetrical disc changes with the rotary position of the disc, which in turn changes the natural frequency of the cantilever beam. Teh self-tuning mechanism is found to increase the bandwidth of the testing apparatus as compared to the bandwith without self-tuning. An improvement of up to 318% was observed between the measured vibration magnitudes of the self-tuning system vs the system without self-tuning. The vibration magnitude is characterized by RMS Acceleration and Displacement as measured by accelerometers and laser displacement sensor. It is expectedthat higher Acceleration and Displacement would couse more electrical power to be generated when the self-tuning mechanism is combinedwith energy conversion devices such as piezo-electric elements.

Actions (For repository staff only : Login required)