Many researchers have been focused on energy harvester for the tire over the past decade. In this paper, we propose a self-tuning stochastic resonance energy harvester for a smart tire with the circuit integration. Compared to existing harvesters, the energy harvester shows large power and wide bandwidth due to stochastic resonance and passive selftuning. The harvester consists of an inward rotating cantilever beam with an electromagnetic transducer. The tuning performance is verified by analysis of Kramers rate and signal-to-noise ratio (SNR). In addition to energy harvester, we implemented the energy harvesting circuit to achieve data acquisition and energy storage. Circuit includes a rectifier, buck-boost converter, wireless communication module, microprocessor and temperature monitoring sensor. In lab test and field test are conducted to performance of self-tuning energy harvester. Circuit assembly is attached to the rim hub while harvester assembly is installed inside the tire with a tire pressure monitoring sensor (TPMS). The results the feasibility of the self-tuning harvesting strategy on the smart tire application.
Energy harvesting from smart tire has been an influential topic for researchers over several years. In this paper, we propose novel energy harvester for smart tire taking advantage of adaptive tuning stochastic resonance. Compared to previous tire energy harvesters, it can generate large power and has wide bandwidth. Large power is achieved by stochastic resonance while wide-bandwidth is accomplished by adaptive tuning via centrifugal stiffening effect. Energy harvesting configuration for modulated noise is described first. It is an electromagnetic energy harvester consists of rotating beam subject to centrifugal buckling. Equation of motion for energy harvester is derived to investigate the effect of centrifugal stiffening. Numerical analysis was conducted to simulate response. The result show that high power is achieved with wide bandwidth. To verify the theoretical and simulation results, the experiment was conducted. Equivalent horizontal rotating platform is built to mimic tire environment. Experiment results showed good agreement with the numerical result with around 10% of errors, which verified feasibility of proposed harvester. Maximum power 1.8mW is achieved from 3:1 scale experiment setup. The equivalent working range of harvester is around 60-105 km/h which is typical speed for car in general road and highway.
Many vibration energy harvesters have been developed in the past to harvest energy from rotating systems. Yet most of
these harvesters are linear resonance-based harvesters whose output power drops dramatically under random excitation.
This poses a serious problem because a lot of vibrations of rotating systems are stochastic. In this paper, an advanced
energy harvesting mechanism is proposed to magnify power output when the excitation is random. Large power output
can be produced with stochastic resonance by inputting weak periodic signal and noise excitation into a bistable system.
Stick-slip and whirling vibrations which are inherently existing in various rotating shaft systems, are used to make
periodic signal and noise excitation. Energy harvester with external magnet was used to compensate biased periodic
force from rotating shaft. The proposed energy harvesting approach is particularly useful for high friction and low speed
application such as oil drilling. Detailed analysis is conducted to prove the effectiveness of the proposed energy
harvesting concept. In addition, experiments were performed to verify the feasibility of this energy harvesting strategy.
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