scholarly journals Mechanical Durability Assessment of an Energy-Harvesting Piezoelectric Inverted Flag

Energies ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 77
Author(s):  
Kaidong Yang ◽  
Andrea Cioncolini ◽  
Mostafa R. A. Nabawy ◽  
Alistair Revell
Keyword(s):  
Temperature Sensor ◽  
Energy Harvester ◽  
Sampling Rate ◽  
Extensive Study ◽  
Polyvinylidene Difluoride ◽  
Structural Fatigue ◽  
Battery Power ◽  
Mechanical Durability ◽  
Durability Assessment ◽  
Agriculture Management

This paper presents results from a practical assessment of the endurance of an inverted flag energy harvester, tested over multiple days in a wind tunnel to provide first insights into flapping fatigue and failure. The inverted flag is a composite bimorph, composed of PVDF (polyvinylidene difluoride) strips combined with a passive metallic core to provide sufficient stiffness. The flag, derived from an earlier, more extensive study, flaps with a typical amplitude of ~120 degrees and a frequency of ~2 Hz, generating a constant power of ~0.09 mW in a wind velocity of 6 m/s. The flag was observed to complete ~5×105 cycles before failure, corresponding to ~70 h of operation. The energy generated over this lifespan is estimated to be sufficient to power a standard low-power temperature sensor for several months at a sampling rate of one sample/minute, which would be adequate for applications such as wildfire detection, environmental monitoring, and agriculture management. This study indicates that structural fatigue may present a practical obstacle to the wider development of this technology, particularly in the context of their usual justification as a ‘deploy and forget’ alternative to battery power. Further work is required to improve the fatigue resistance of the flag material.

Simply supported FPEDs connected by springs for broadband energy harvesting

2020 ◽  
Vol 64 (1-4) ◽  
pp. 201-210
Author(s):  
Yoshikazu Tanaka ◽  
Satoru Odake ◽  
Jun Miyake ◽  
Hidemi Mutsuda ◽  
Atanas A. Popov ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Evaluation Method ◽  
Energy Harvester ◽  
Vibrational Energy ◽  
Functional Materials ◽  
Vibration Energy ◽  
Theoretical Evaluation ◽  
Vibration Energy Harvester ◽  
Polyvinylidene Difluoride ◽  
Simply Supported

Energy harvesting methods that use functional materials have attracted interest because they can take advantage of an abundant but underutilized energy source. Most vibration energy harvester designs operate most effectively around their resonant frequency. However, in practice, the frequency band for ambient vibrational energy is typically broad. The development of technologies for broadband energy harvesting is therefore desirable. The authors previously proposed an energy harvester, called a flexible piezoelectric device (FPED), that consists of a piezoelectric film (polyvinylidene difluoride) and a soft material, such as silicon rubber or polyethylene terephthalate. The authors also proposed a system based on FPEDs for broadband energy harvesting. The system consisted of cantilevered FPEDs, with each FPED connected via a spring. Simply supported FPEDs also have potential for broadband energy harvesting, and here, a theoretical evaluation method is proposed for such a system. Experiments are conducted to validate the derived model.

Attachable Magnetic-Piezoelectric Energy-Harvester Powered Wireless Temperature Sensor Nodes for Monitoring of High-Power Electrical Facilities

2021 ◽  
Vol 21 (9) ◽  
pp. 11140-11154
Author(s):  
Po-Chen Yeh ◽  
Tzu-Hao Chien ◽  
Min-Siang Hung ◽  
Chuan-Ping Chen ◽  
Tien-Kan Chung
Keyword(s):  
High Power ◽  
Temperature Sensor ◽  
Energy Harvester ◽  
Sensor Nodes ◽  
Piezoelectric Energy

scholarly journals Effect of Piezo-Embedded Inverted Flag in Free Shear Layer Wake

Aerospace ◽  
2019 ◽  
Vol 6 (3) ◽  
pp. 33
Author(s):  
Sidaard Gunasekaran ◽  
Grant Ross
Keyword(s):  
Shear Layer ◽  
Oscillation Frequency ◽  
Energy Harvester ◽  
Oscillation Amplitude ◽  
Angle Of Attack ◽  
Lower Surface ◽  
Free Shear Layer ◽  
Polyvinylidene Difluoride ◽  
Image Velocimetry ◽  
Naca 0012

The use of flexible inverted piezo embedded Polyvinylidene Difluoride (PVDF) as a simultaneous energy harvester and as a wake sensor is explored. The oscillation amplitude (characterized by voltage output) and oscillation frequency of the piezo-embedded PDVF was quantified in the wake of a 2D NACA 0012 model and SD7003 model at a Reynolds number of 100,000 and 67,000, respectively. The performance of the sensor was also quantified in the freestream without the presence of the wing. In order to quantify the sensor response to angle of attack and downstream distance, the amplitude and frequency of oscillations were recorded in the wing wake. Increase in angle of attack of the wing resulted in increase in oscillation frequency and amplitude of the PVDF. The results also indicated that the inverted flag configuration performed better in the wake under unsteady conditions when compared to freestream conditions. The results from Particle Image Velocimetry indicated that the wake signature was not affected by the presence of the PVDF in the wake. The root mean square voltage contours in the wake of SD7003 airfoil show remarkable free shear layer wake features such as upper and lower surface stratification and downwash angle which shows the sensitivity of the sensor to the unsteadiness in the wake. The capability of this device to act as a potential energy harvester and as a sensor has serious implications in extending the mission capabilities of small UAVs.

Integration of a torsion-based shear-mode energy harvester and energy management electronics for a sensor module

2016 ◽  
Vol 28 (10) ◽  
pp. 1346-1357
Author(s):  
Vainatey Kulkarni ◽  
Frédéric Giraud ◽  
Christophe Giraud-Audine ◽  
Michel Amberg ◽  
Ridha Ben Mrad ◽  
...  
Keyword(s):  
Temperature Sensor ◽  
Energy Harvester ◽  
Maximum Power ◽  
Electrical Charge ◽  
Superior Performance ◽  
Shear Mode ◽  
Piezoelectric Energy ◽  
Sensor Module ◽  
Charge Extraction ◽  
Mode Energy

This work demonstrates the ability of a torsion-based shear-mode energy harvester to power a sensor module by integrating a temperature sensor circuit with a purpose developed piezoelectric energy harvester. A 10-cm3 energy harvester was developed for this application and was found to produce over 200 µW of maximum power through an optimal load resistance under 0.25  gpk acceleration excitation at its resonant frequency of 237 Hz. This harvester was then tested with two interface circuits: a standard interface diode bridge rectifier and a nonlinear synchronous electrical charge extraction circuit that were compared for their suitability in powering the sensor module. Through this, the synchronous electrical charge extraction nonlinear conditioning circuit was found to have superior performance when charging a capacitor and with DC loads at low voltages and was capable of providing a maximum power output of 37 µW under 0.25  gpk acceleration at 237 Hz. This output power was then used to successfully power a temperature sensor module consisting of a temperature sensor, a microcontroller, and a radio-frequency identification memory chip at a sensing frequency of 0.5 Hz.

scholarly journals Development of a Dental Implantable Temperature Sensor for Real-Time Diagnosis of Infectious Disease

Sensors ◽  
2020 ◽  
Vol 20 (14) ◽  
pp. 3953
Author(s):  
Jeffrey J. Kim ◽  
Gery R. Stafford ◽  
Carlos Beauchamp ◽  
Shin Ae Kim
Keyword(s):  
Real Time ◽  
Dental Implant ◽  
Temperature Sensor ◽  
Flexible Substrate ◽  
Polyimide Film ◽  
Elastic Response ◽  
Optical Images ◽  
Channel Temperature ◽  
Mechanical Durability

Implantable sensors capable of real-time measurements are powerful tools to diagnose disease and maintain health by providing continuous or regular biometric monitoring. In this paper, we present a dental implantable temperature sensor that can send early warning signals in real time before the implant fails. Using a microfabrication process on a flexible polyimide film, we successfully fabricated a multi-channel temperature sensor that can be wrapped around a dental implant abutment wing. In addition, the feasibility, durability, and implantability of the sensor were investigated. First, high linearity and repeatability between electrical resistance and temperature confirmed the feasibility of the sensor with a temperature coefficient of resistance (TCR) value of 3.33 × 10–3/°C between 20 and 100 °C. Second, constant TCR values and robust optical images without damage validated sufficient thermal, chemical, and mechanical durability in the sensor’s performance and structures. Lastly, the elastic response of the sensor’s flexible substrate film to thermal and humidity variations, simulating in the oral environment, suggested its successful long-term implantability. Based on these findings, we have successfully developed a polymer-based flexible temperature sensor for dental implant systems.

A low power-integrated temperature sensor interface circuit

2022 ◽  
Author(s):  
Mingyuan Ren ◽  
Huijing Yang ◽  
Beining Zhang ◽  
Guoxu Zheng
Keyword(s):  
Temperature Sensor ◽  
Supply Voltage ◽  
Sampling Rate ◽  
Average Power ◽  
Temperature Sensitive ◽  
Frequency Noise ◽  
Power Supply Voltage ◽  
Sensor Interface ◽  
Interface Circuit ◽  
Average Power Consumption

This paper constructs and simulates the interface circuit of a temperature sensor based on SMIC 0.18 [Formula: see text]m CMOS. The simulation results show that when the power supply voltage is 1.8 V, the chopper op-amp gain is 89.44 dB, the low-frequency noise is 71.83 nV/Hz,[Formula: see text] and the temperature coefficient of the core temperature sensitive circuit is 1.7808 mV/[Formula: see text]C. The sampling rate of 10-bit SAR ADC was 10 kS/s, effective bit was 9.0119, SNR was 59.3256 dB, SFDR was 68.7091 dB, and THD was −62.5859 dB. The measurement range of temperature sensor interface circuit is −50[Formula: see text]C[Formula: see text]C, the relative temperature measurement error is ±0.47[Formula: see text]C, the resolution is 0.2[Formula: see text]C/LSB, and the overall average power consumption is 434.9 [Formula: see text]W.

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