Accelerated Aging Procedures of Bending Piezoelectric Structures Using Electrical Stress Induced Approaches

Hoang, Trang; Férin, Guillaume; Bantignies, Claire; Rosinski, Bogdan; Vince, Phillipe; Cheppe, Maxime; An, Ning

doi:10.1109/ultsym.2018.8579799

Cited by 1 publication

(2 citation statements)

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“…Wozniak et al measured a shift in the resonant frequency of their PMN-PT harvester of -7.0% between 0°C and 70°C while Gasnier et al measured a shift of -5.6% with a PZT-5A harvester between 90°C and 120°C. Concerning the aging effects, Hoang et al [6] measured a decrease of around 6% of the resonant frequency of their piezoelectric cantilevers after 6.7 billon cycles. Furthermore, a drift of 1% of the resonant frequency of the harvester of Benchemoul et al [58] dedicated to HVAC systems led to a decrease of 30% of the harvested power compared to a frequency adjusted case.…”

Section: Operation With a Dedicated Integrated Circuitmentioning

confidence: 99%

“…This situation is encountered in many applications as shown by Rantz and Roundy [5]: one third of the vehicle vibration signals presented in the NiPS Laboratory "Real Vibration" database [4] exhibit a dominant vibration frequency that varies. This mismatch can also occur when the resonant frequency of the harvester drifts due to the aging of materials and assemblies [6] or temperature variations of the environment [7,8]. In response to these frequency mismatches a new trend has recently emerged with the development of electrical techniques [9,10] and power management circuits [11,12] able to tune the resonant frequency of piezoelectric cantilevers thanks to the coupling effect between the mechanical dynamics and the electrical circuit.…”

Section: Introductionmentioning

confidence: 99%

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Strongly coupled piezoelectric cantilevers for broadband vibration energy harvesting

et al. 2020

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Vibration energy harvesters based on piezoelectric resonators are promising for powering Wireless Sensors Nodes (WSNs). Yet, any mismatch between the resonant frequency of traditional harvesters and the vibration frequency can drastically decrease the scavenged power and make them ineffective. Electrical techniques able to tune the resonant frequency of piezoelectric harvesters has been proposed as a solution and opens up new perspectives. To be fully competitive, this approach requires energy harvesters with very strong global electromechanical coupling coefficients k² (>10%), whose design remains a challenge today. This work reports on a method to design strongly coupled piezoelectric cantilevers thanks to an analytical approach based on the Rayleigh-Ritz method and a two degrees-of-freedom model, which considers the proof mass inertia effects. Through an expression of the coupling coefficient, we provide design guidelines, which are experimentally validated. We show that a long proof mass is a very effective configuration to maximize the global electromechanical coupling coefficient and consequently the frequency bandwidth of the system. Three proposed prototypes exhibit some of the strongest squared global electromechanical coupling coefficients k² of the state-of-the-art of piezoelectric harvesters (16.6% for the PMN-PT cantilever, 11.3% and 16.4% for the narrow and wide PZT-5A cantilevers respectively) and demonstrate a wide bandwidth behavior (10.1%, 7.8% and 11.3% of the central frequency respectively). Using a strongly coupled prototype based on PZT-5A leveraged by a dedicated integrated circuit, we experimentally show that it can harvest enough power (more than 100µW) to supply a WSN over a frequency bandwidth as large as 21%.

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Section: Operation With a Dedicated Integrated Circuitmentioning

confidence: 99%