Sufficient power supply to run GPS machinery and transmit data on a long-term basis remains to be the key challenge for wildlife tracking technology. Traditional way of replacing battery periodically is not only time and money consuming but also dangerous to live-trapping wild animals. In this paper, an innovative wildlife tracking device with multi-source energy harvester with advantage of high efficiency and reliability is investigated and developed. This multi-source energy harvester entails a solar energy harvester and an innovative rotational electromagnetic energy harvester is mounted on the “wildlife tracking collar” which will remarkably extend the duration of wild life tracking. A feedforward and feedback control of DC-DC converter circuit is adopted to passively realize the Maximum Power Point Tracking (MPPT) logic for the solar energy harvester. The rotational electromagnetic energy harvester can mechanically rectify the irregular bidirectional motion into unidirectional motion has been modeled and demonstrated.
Making the use of the electromechanical characteristics of piezoelectric, admittance-based structure health monitoring
method is an effective method to detect damages. The experiment study on the admittance-based damage detection
method with high-order resonant circuit is presented in this paper, including comparisons with first-order resistive
circuit, and second-order inductive circuit on the aspects of signal-to-noise ratio and damage detection sensitivity. The
results show that the designed damage detection method with high-order resonant circuit has higher signal-to-noise ratio
and higher sensitivity to damages than the first-order resistive circuit and the second-order inductive circuit. Optimal
electrical components, i.e., resistors, inductors, and capacitors, are found in the experiment study. It also indicates that
the admittance change due to damages is very sensitive to the inaccuracies of electrical components. We find that the
damage detection method with high-order resonant circuit has very high requirement for the resistance in the circuit, that
is to say, even a small resistance (for example, 0.5 Ohm) may cause too large damping for the system.