Papers by Dr Iman Izadgoshasb
Microelectronics Journal, 2016
Sensors (Basel, Switzerland), 2021
Information and communication technologies (ICT) are major features of smart cities. Smart sensin... more Information and communication technologies (ICT) are major features of smart cities. Smart sensing devices will benefit from 5 G and the Internet of Things, which will enable them to communicate in a safe and timely manner. However, the need for sustainable power sources and self-powered active sensing devices will continue to be a major issue in this sector. Since their discovery, piezoelectric energy harvesters have demonstrated a significant ability to power wireless sensor nodes, and their application in a wide range of systems, including intelligent transportation, smart healthcare, human-machine interfaces, and security systems, has been systematically investigated. Piezoelectric energy-harvesting systems are promising candidates not only for sustainably powering wireless sensor nodes but also for the development of intelligent and active self-powered sensors with a wide range of applications. In this paper, the various applications of piezoelectric energy harvesters in poweri...
Smart Materials and Structures, 2022
This study gives a thorough model for a small vibration powered piezoelectric device (PD) and ana... more This study gives a thorough model for a small vibration powered piezoelectric device (PD) and analysis modes of operation and control of a self-powered boost converter circuit (SPBC) for the goal of tracking the PD’s finest functioning points. The concept defines the power dependency of the PD on mechanical excitation and frequency, and it aids in the design of load behaviour for power optimisation. With a fundamental control circuit, the electrical nature of the input (i.e. PD) of an SPBC circuit in the discontinuous current mode (DCM) is found to be in perfect configuration with the studied optimisation requirements. The performance of the proposed SPBC circuit is studied in terms of both simulation and experiment. Firstly, the performance of the SPBC on optimisation of the piezoelectric device is investigated using a mechanical shaker. Then, the proposed circuit’s ability to charge a battery, which can be used in piezo garden lights with low-frequency applicability, is also inves...
Piezoelectric materials are capable of converting energy from mechanical vibration to electrical ... more Piezoelectric materials are capable of converting energy from mechanical vibration to electrical energy. Piezoelectricity stands for pressure electricity and is a property of special crystalline materials including quartz, Rochelle salt, tourmaline, and barium titanate 1 .Piezoelectricity is generated when dielectric materials that have developed a polarization are subjected to mechanical strain deformation. The mechanical strain produces a biasing forcer arrangement of atoms there by creating polarization and thus an electric field 2-3. Conversely, when a piezoelectric material is subjected to an electric field, it will cause a mechanical deformation with in its structure. In both conditions, changing the direction of the applied force, (mechanical or electrical), will generate a change in the direction of the effect 2-3. Harvesting mechanical energy from human motion is an attractive approach for obtaining clean and sustainable electric energy to power wearable sensors, which are ...
Piezoelectric materials are capable of converting energy from mechanical vibration to electrical ... more Piezoelectric materials are capable of converting energy from mechanical vibration to electrical energy. Piezoelectricity stands for pressure electricity and is a property of special crystalline materials including quartz, Rochelle salt, tourmaline, and barium titanate 1 .Piezoelectricity is generated when dielectric materials that have developed a polarization are subjected to mechanical strain deformation. The mechanical strain produces a biasing forcer arrangement of atoms there by creating polarization and thus an electric field 2-3. Conversely, when a piezoelectric material is subjected to an electric field, it will cause a mechanical deformation with in its structure. In both conditions, changing the direction of the applied force, (mechanical or electrical), will generate a change in the direction of the effect 2-3. Harvesting mechanical energy from human motion is an attractive approach for obtaining clean and sustainable electric energy to power wearable sensors, which are ...
Piezoelectric materials are capable of converting energy from mechanical vibration to electrical ... more Piezoelectric materials are capable of converting energy from mechanical vibration to electrical energy. Piezoelectricity is generated when dielectric materials that have developed a polarization are subjected to mechanical strain deformation. Conversely, when a piezoelectric material is subjected to an electric field, it will cause a mechanical deformation within its structure. Harvesting mechanical energy from human motion is an attractive approach for obtaining clean and sustainable electric energy to power wearable sensors, which are widely used for health monitoring, activity recognition, gait analysis and so on. This research studies the capability of piezoelectric energy harvester in converting mechanical energy of human motions to electricity. The harvester exploits walking swing and shock excitations and could be embedded to the shoe. Series of magnets can amplify the foot acceleration in swing phase. The harvester contains a cantilever beam that can vibrate based on foot a...
Structural adhesives are an important component of strengthening and repair techniques for struct... more Structural adhesives are an important component of strengthening and repair techniques for structures. Adequate and proper curing of such materials is essential to achieve its desired strength and durability. In this study, the curing process of epoxy type Sikadur 330 is monitored using the electromechanical impedance (EMI) technique employing smart piezoelectric material, namely Lead Zirconate Titanate (PZT). Experimental results show that the PZT transducer embedded into the epoxy in liquid state is effective in monitoring the initial setting and the subsequent hardening process of a lab scale epoxy coupon. Rightward movement of both the PZT resonance peaks and the structural resonance peaks indirectly reflects the curing process. This study shows that the EMI technique is capable of monitoring the curing process of the structural adhesive. Future study shall focus on developing theoretical model capable of parametrically relate the electrical signatures to the mechanical stiffnes...
The use of structural adhesives, such as epoxy, for the strengthening and repair of civil infrast... more The use of structural adhesives, such as epoxy, for the strengthening and repair of civil infrastructure is gaining popularity in the engineering community. Of particular concern to the viability of intervention measure is the degradation of strength and durability of the epoxy over time, especially when exposed to aggressive environments. Monitoring the corrosion process of epoxy is thus essential to ensure safety of the host structure. In this paper, the electromechanical impedance (EMI) technique that employs a smart piezoelectric transducer is used to monitor the degradation process of commercially available epoxy when exposed to corrosive environments. Standard epoxy coupons with surface bonded piezoelectric transducer are prepared and then immersed in either acidic or saline conditions in the laboratory. Experimental results show that the change in frequency of resonance peaks in the admittance signatures versus the frequency spectrum is a good indicator of the corrosion proce...
Sustainability, 2021
Collaboration is problematic in the public sector, yet many smart city theorists advocate relatio... more Collaboration is problematic in the public sector, yet many smart city theorists advocate relationships fully dependent upon collaboration to address the intense complexity encountered by city governments and achieve city objectives of quality of life, efficiency, effectiveness, and economic and environmental sustainability. Skeptical, we inductively drew together the widely dispersed theoretical tenets of smart city collaboration into a framework of collaborative relationships and tested this framework using secondary evidence as to practice in greater Amsterdam. Mostly authentic collaborative relationships were explicated. Theory is extended by clarifying the roles of actors, especially the role of city government as actor and steward of the collaborative ecosystem. Future research should unpack the factors that impact the sustainability of smart city collaborations.
IEEE Journal of the Electron Devices Society, 2020
In recent years, piezoelectric materials have been widely investigated for harvesting energy from... more In recent years, piezoelectric materials have been widely investigated for harvesting energy from ambient vibrations. A vibrating piezoelectric device (PD) generates alternating current (AC), which needs to be converted into direct current (DC) for powering electronic devices or for storage. A traditional full-wave bridge rectifier (FBR) interface circuit serves this purpose, but it suffers from high power loss due to the presence of high forward voltage across the diodes. In this article, an improved H-Bridge rectifier circuit is proposed as the AC-DC rectifier circuit to reduce power loss for high frequency and low amplitude application. The performance of the proposed rectifier circuit was experimentally studied, analysed and discussed. Two different testing scenarios for high frequency, namely, varying input power with fixed excitation frequency and varying excitation frequency with fixed input voltage were considered. Applicability of the circuit at low frequency range was also investigated. The outcome shows that the proposed circuit notably increases the voltage and the power produced from the PD when compared to traditional FBR circuits.
Energy Conversion and Management, 2019
Abstract Harvesting electrical energy from various human motions using piezoelectric energy harve... more Abstract Harvesting electrical energy from various human motions using piezoelectric energy harvesters (PEH) is gaining research attention in recent years. The energy harvested could potentially power hand held electronic devices and medical devices without the need of external power source for recharging batteries. In this study, an attempt is made to improve the efficiency of PEH to harvest energy from human motions by adopting a double pendulum system coupled with magnetic force interactions. For the purpose of comparison, three configurations of PEH which includes the conventional PEH with cantilever beam (PEHCB), the PEH with single pendulum system (PEHSP) and the PEH with double pendulum system (PEHDP) are experimentally studied. Excitations by both mechanical shaker and major human body parts during walking and jogging motions are investigated. The performance of each configuration, in terms of voltage and power produced as well as the idle time between each cycle, are analysed, compared and discussed. ANSYS© software is used to analyse the proposed model and MATLAB© software is used to calculate the output power. The results demonstrate that, with the use of the proposed double pendulum system, multiple impacts in each motion cycle is generated, thus producing higher voltage and power as compared to the conventional PEHCB. The idle time between each motion cycle is also effectively reduced. The efficiency of the PEH is thus significantly increased.
Energies, 2019
Harvesting electricity from low frequency vibration sources such as human motions using piezoelec... more Harvesting electricity from low frequency vibration sources such as human motions using piezoelectric energy harvesters (PEH) is attracting the attention of many researchers in recent years. The energy harvested can potentially power portable electronic devices as well as some medical devices without the need of an external power source. For this purpose, the piezoelectric patch is often mechanically attached to a cantilever beam, such that the resonance frequency is predominantly governed by the cantilever beam. To increase the power generated from vibration sources with varying frequency, a multiresonant PEH (MRPEH) is often used. In this study, an attempt is made to enhance the performance of MRPEH with the use of a cantilever beam of optimised shape, i.e., a cantilever beam with two triangular branches. The performance is further enhanced through optimising the design of the proposed MRPEH to suit the frequency range of the targeted vibration source. A series of parametric studi...
The use of structural adhesives, such as epoxy, for the strengthening and repair of civil infrast... more The use of structural adhesives, such as epoxy, for the strengthening and repair of civil infrastructure is gaining popularity in the engineering community. Of particular concern to the viability of intervention measure is the degradation of strength and durability of the epoxy over time, especially when exposed to aggressive environments. Monitoring the corrosion process of epoxy is thus essential to ensure safety of the host structure. In this paper, the electromechanical impedance (EMI) technique that employs a smart piezoelectric transducer is used to monitor the degradation process of commercially available epoxy when exposed to corrosive environments. Standard epoxy coupons with surface bonded piezoelectric transducer are prepared and then immersed in either acidic or saline conditions in the laboratory. Experimental results show that the change in frequency of resonance peaks in the admittance signatures versus the frequency spectrum is a good indicator of the corrosion proce...
In recent years, several researchers have been interested in harvesting electricity from low freq... more In recent years, several researchers have been interested in harvesting electricity from low frequency vibration sources such as human movements utilising piezoelectric energy harvesters (PEH). Without the need for an external power source, the energy captured might possibly run portable electronic gadgets as well as certain medical equipment. The piezoelectric patch is often mechanically linked to a cantilever beam for this purpose, allowing the cantilever beam to dominate the resonance frequency. A multi-resonant PEH (MRPEH) is often used to improve the power produced by vibration sources with changing frequency. In this work, an effort is made to improve the performance of MRPEH by using a cantilever beam with two triangular branches that has been optimised in shape. The performance of the proposed MRPEH is further improved by tailoring the design to the frequency range of the intended vibration source. To get a better understanding of the influence of each design parameter on the power production at a low frequency vibration, a series of parametric studies were initially carried out using finite-element analysis. After that, selected outcomes were tested in the lab. Finally, an improved design was presented. The findings show that broadband energy harvesting is possible with the use of a correctly constructed MRPEH, and that the PEH system's efficiency may be greatly boosted.
In recent years, several researchers have been interested in harvesting electricity from low freq... more In recent years, several researchers have been interested in harvesting electricity from low frequency vibration sources such as human movements utilising piezoelectric energy harvesters (PEH). Without the need for an external power source, the energy captured might possibly run portable electronic gadgets as well as certain medical equipment. The piezoelectric patch is often mechanically linked to a cantilever beam for this purpose, allowing the cantilever beam to dominate the resonance frequency. A multi-resonant PEH (MRPEH) is often used to improve the power produced by vibration sources with changing frequency. In this work, an effort is made to improve the performance of MRPEH by using a cantilever beam with two triangular branches that has been optimised in shape. The performance of the proposed MRPEH is further improved by tailoring the design to the frequency range of the intended vibration source. To get a better understanding of the influence of each design parameter on the power production at a low frequency vibration, a series of parametric studies were initially carried out using finite-element analysis. After that, selected outcomes were tested in the lab. Finally, an improved design was presented. The findings show that broadband energy harvesting is possible with the use of a correctly constructed MRPEH, and that the PEH system's efficiency may be greatly boosted.
Sensors, 2021
Information and communication technologies (ICT) are major features of smart cities.
Smart sensin... more Information and communication technologies (ICT) are major features of smart cities.
Smart sensing devices will benefit from 5 G and the Internet of Things, which will enable them to communicate in a safe and timely manner. However, the need for sustainable power sources and selfpowered
active sensing devices will continue to be a major issue in this sector. Since their discovery,
piezoelectric energy harvesters have demonstrated a significant ability to power wireless sensor
nodes, and their application in a wide range of systems, including intelligent transportation, smart healthcare, human-machine interfaces, and security systems, has been systematically investigated.
Piezoelectric energy-harvesting systems are promising candidates not only for sustainably powering wireless sensor nodes but also for the development of intelligent and active self-powered sensors with
a wide range of applications. In this paper, the various applications of piezoelectric energy harvesters in powering the Internet of Things sensors and devices in smart cities are discussed and reviewed.
see: https://epubs.scu.edu.au/theses/658/ >>>>>> Harves... more see: https://epubs.scu.edu.au/theses/658/ >>>>>> Harvesting electricity from human motions using piezoelectric energy harvesters is attracting the attention of many researchers in recent years. The energy harvested can potentially power portable electronic devices such as mobile phones as well as some medical devices like pacemakers without the need of external power source or battery. The frequency of human movements is low and thus the design of energy harvesting systems needs to be improved to harvest high power. The overarching aim of this thesis was to improve the efficiency of piezoelectric energy harvesting from human motions. To achieve this, optimising orientation of conventional piezoelectric cantilever beam investigated; the new mechanism consisting of double pendulum system was studied to make several impacts in each walking step and to reduce the idle time among voltage peaks and finally the new shape design of cantilever was proposed to generate multi resonance peaks in the low frequency range. The outcome of this research showed that (1) maximum power (2779 micro Watts) was achieved when the PEH was orientated at 70º with reference to a coordinate system attached to the leg; (2) using double pendulum system, a dramatic increase in maximum output voltage and power (2100 micro Watts) was achieved with the proposed system on both the well-controlled mechanical shaker test and practical tests on human arm and leg motion in walking and jogging modes, in comparison to the conventional harvester and a similar system with only one pendulum and (3) the proposed shape design of cantilever with two branched triangular beams was able to produce several resonance peaks under 20 Hz which can increase the output power. These achievements may help to improve the efficiency of piezoelectric energy harvesting systems in the future.
Energy Conversion and Management
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Papers by Dr Iman Izadgoshasb
Smart sensing devices will benefit from 5 G and the Internet of Things, which will enable them to communicate in a safe and timely manner. However, the need for sustainable power sources and selfpowered
active sensing devices will continue to be a major issue in this sector. Since their discovery,
piezoelectric energy harvesters have demonstrated a significant ability to power wireless sensor
nodes, and their application in a wide range of systems, including intelligent transportation, smart healthcare, human-machine interfaces, and security systems, has been systematically investigated.
Piezoelectric energy-harvesting systems are promising candidates not only for sustainably powering wireless sensor nodes but also for the development of intelligent and active self-powered sensors with
a wide range of applications. In this paper, the various applications of piezoelectric energy harvesters in powering the Internet of Things sensors and devices in smart cities are discussed and reviewed.
Smart sensing devices will benefit from 5 G and the Internet of Things, which will enable them to communicate in a safe and timely manner. However, the need for sustainable power sources and selfpowered
active sensing devices will continue to be a major issue in this sector. Since their discovery,
piezoelectric energy harvesters have demonstrated a significant ability to power wireless sensor
nodes, and their application in a wide range of systems, including intelligent transportation, smart healthcare, human-machine interfaces, and security systems, has been systematically investigated.
Piezoelectric energy-harvesting systems are promising candidates not only for sustainably powering wireless sensor nodes but also for the development of intelligent and active self-powered sensors with
a wide range of applications. In this paper, the various applications of piezoelectric energy harvesters in powering the Internet of Things sensors and devices in smart cities are discussed and reviewed.
pacemakers without the need of external power source or battery.
The frequency of human movements is low and thus the design of energy harvesting systems needs to be improved to harvest high power. The overarching aim of this thesis was to improve the efficiency of piezoelectric energy harvesting from human motions. To achieve this,
optimising orientation of conventional piezoelectric cantilever beam investigated; the new mechanism consisting of double pendulum system was studied to make several impacts in each walking step and to reduce the idle time among voltage peaks and finally the new shape design of cantilever was proposed to generate multi resonance peaks in the low frequency range. The outcome of this research showed that (1) maximum power (2779 micro Watts) was achieved when the PEH was orientated at 70º with reference to a coordinate system attached to the leg; (2) using double pendulum system, a dramatic increase in maximum output voltage and power (2100 micro Watts) was achieved with the proposed system on both the well-controlled mechanical shaker test and practical tests on human arm and leg motion in walking and jogging
modes, in comparison to the conventional harvester and a similar system with only one pendulum and (3) the proposed shape design of cantilever with two branched triangular beams was able to produce several resonance peaks under 20 Hz which can increase the output power.
These achievements may help to improve the efficiency of piezoelectric energy harvesting systems in the future.