KMITL

Permanent URI for this communityhttps://dspace.kmitl.ac.th/handle/123456789/1

Browse

Search Results

Now showing 1 - 10 of 12

Some of the metrics are blocked by your
consent settings
Piezoelectric composite films for real-time foot strike detection and energy generation
(2025-12-16)
Panpho, Phakakorn
;
Charoonsuk, Thitirat
;
Vittayakorn, Naratip
;
Charoenthai, Nipaphat
;
Bongkarn, Theerachai
Energy harvesting technology integrated into running shoes enables the conversion of mechanical energy from foot strikes into electrical signals for real-time monitoring. This approach enhances running efficiency, reduces injury risk, and eliminates the need for external power sources. In this study, composite films combining lead-free piezoelectric ceramics (KNNS-BNZ-xBF) with PDMS were developed for efficient energy harvesting and accurate detection of foot-strike patterns. XRD analysis revealed a broad R–O–T phase coexistence zone (0 ≤ x ≤ 0.006) and a transition to an R–T phase boundary for x > 0.006, with reduced grain size as xBF increased. The sample with xBF = 0.006 mol.% showed optimal electrical properties and was selected for composite film fabrication. Electrical output increased with ceramic loading, reaching maximum open-circuit voltage (V<inf>OC</inf>) and short-circuit current (I<inf>SC</inf>) at 18 wt% KBB due to enhanced piezoelectric response and uniform particle dispersion. The films, mounted on running shoe soles, successfully detected different foot-strike patterns (heel strike, midfoot, and forefoot). This system demonstrates strong potential for wearable sensors in athletic monitoring and injury prevention.
Some of the metrics are blocked by your
consent settings
Effect of Ba0.93Ca0.04La0.03Sn0.1Ti0.9O3 addition on structural and electrical properties of lead-free 0.5Ba(Zr0.2Ti0.8)O3-0.5(Ba0.7Ca0.3)TiO3 piezoelectric ceramics
(2025-12-01)
Kantha, Puripat
;
Unruan, Muangjai
;
Tunkasiri, Tawee
;
Pengpat, Kamonpan
;
Sukkha, Usa
The doping of other materials into the structure of BCZT ceramics can improve the electrical properties. The lead-free piezoelectric ceramics in the (1-x)BCZT–xBCLST binary system, where x = 0.00, 0.01, 0.03, 0.05, and 0.07 mol, were synthesized using a two-step mixed oxide method. Initially, pure phases of 0.5Ba(Zr<inf>0.2</inf>Ti<inf>0.8</inf>)O<inf>3</inf>-0.5(Ba<inf>0.7</inf>Ca<inf>0.3</inf>)TiO<inf>3</inf> (BCZT) and Ba<inf>0.93</inf>Ca<inf>0.04</inf>La<inf>0.03</inf>Sn<inf>0.1</inf>Ti<inf>0.9</inf>O<inf>3</inf> (BCLST) powders were separately prepared by mixed oxide and conventional solid-state reaction methods. X-ray diffraction patterns and Ti K-edge X-ray Absorption Near-Edge Structure (XANES) spectra revealed structural distortions in BCLST-doped ceramics. The electrical properties including dielectric, piezoelectric, and ferroelectric properties were evaluated. Besides, the dielectric constant and dielectric loss at room temperature of BCZT–BCLST ceramics were enhanced with increasing BCLST content. The dielectric properties at room temperature improved with increasing BCLST concentration from x = 0.00 to x = 0.03 mol, with the maximum dielectric constant rising from 1408 to 2552—an increase of approximately 81 %. The hysteresis P–E loop of BCZT–BCLST ceramics exhibited a slim loop, with a maximum remanent polarization (P<inf>r</inf>) of 7.22 μC/cm2 observed at x = 0.03 mol. The optimal doping condition for BCLST in BCZT ceramics was found at 0.03 mol, yielding the highest piezoelectric coefficient (d<inf>33</inf>) of 235 pC/N—an improvement of approximately 9 % compared to the undoped sample (x = 0.00).
Some of the metrics are blocked by your
consent settings
Enhanced electrical and energy storage performances of Fe, Sb co-doped BNBCTS ceramics synthesized via the solid-state combustion technique
(2024-12-01)
Kornphom, C.
;
Saenkam, K.
;
Yotthuan, S.
;
Vittayakorn, N.
;
Bongkarn, T.
In this study BNBCTS ceramics were co-doped with Fe and Sb to form (Bi<inf>0.5</inf>Na<inf>0.5</inf>)<inf>0.93</inf>(Ba<inf>0.945</inf>Ca<inf>0.055</inf>)<inf>0.07</inf>(Ti<inf>(0.9946-x)</inf>Sn<inf>0.0054</inf>)(Fe<inf>0.5</inf>Sb<inf>0.5</inf>)<inf>x</inf>O<inf>3</inf> ceramics (denoted as BNBCTS-xFS) with various x content and were prepared via the solid-state combustion technique to enhance the electrical and energy storage performance. The effect of co-doping Fe and Sb on the phase formation, defect dipole, microstructure, electrical and energy storage properties of BNBCTS-xFS ceramics was studied. When x content increased from 0.0 to 0.030, the amount of the rhombohedral (R) phase decreased from 51 to 24 % while the tetragonal (T) phase increased from 49 to 76 %. The increased Fe and Sb content increased the defect dipole of singly/doubly charged oxygen-vacancies (V<inf>O</inf>∙/ V<inf>O</inf>∙∙) and caused more Ti4+ to transition to Ti3+, which caused the transition temperature of the ferroelectric phase to relaxor state (T<inf>F-R</inf>) in the ceramics to drop to below room temperature and it exhibited relaxor characteristics at room temperature. The ceramic with an x content of 0.010 had the largest grain size (3.06 μm), excellence ferroelectric properties (P<inf>r</inf> ∼31.04 μC/cm2, P<inf>m</inf> ∼38.98 μC/cm2 and E<inf>c</inf> ∼18.28 kV/cm), the largest electro strain (∼0.175 %) and a large d<inf>33</inf>* of 350 pm/V. Moreover, when x = 0.020, the ergodic relaxor ceramic showed the smallest grain size (1.03 μm), the lowest remanant polarization (P<inf>r</inf>) of 4.52 μC/cm2 and the lowest coercive field (E<inf>c</inf>) of 8.37 kV/cm, at an electric field of 60 kV/cm. More importantly, energy storage properties at the electric breakdown strength (E<inf>b</inf> = 120 kV/cm) of the ceramics with an x content of 0.020 exhibited a recoverable energy storage density (W<inf>rec</inf>) of 1.81 J/cm3, a total energy storage density (W<inf>total</inf>) of 2.95 J/cm3 and an efficiency (η) of 61.30%, with excellent thermal (∼25–150 °C) and frequency stability (∼1–100 Hz). This study provides new insights into the modulation of BNBCTS ceramics with Fe and Sb co-doping, which could effectively improve the electrical properties and energy storage properties of BNBCTS-xFS ceramics.
Some of the metrics are blocked by your
consent settings
Investigating the feasibility of nano-grid infrastructure integration into street lighting systems based on energy production and economic evaluation
(2024-12-01)
Ngaopitakkul, Atthapol
;
Yoomak, Suntiti
To enhance efficient and sustainable energy usage in street lighting systems, a nano-grid infrastructure comprising an energy harvesting, storage, and management system is integrated. This paper investigated the feasibility in terms of energy production and economic evaluation of using various energy harvesting for photovoltaic, piezoelectric, and wind energy in a nano-grid street lighting system. The photovoltaic system was evaluated based on the factors of annual actual solar radiation, power losses, and system performance using the PVsyst software. The piezoelectric energy production was studied and designed. Optimal piezoelectric installation for maximum power generation was analyzed in terms of deformation and stress using ANSYS software. For wind power generation, the wind turbine characteristics, along with its location, were designed to optimize power output using computational fluid dynamic simulations in ANSYS software. After that, economic evaluation for the proposed energy harvesting systems for nano-grid street lighting system are analyzed and compared in terms of DPP, NPV, IRR, and LCOE. In addition, the optimization of using PV, a wind system, a hybrid PV—wind system for nano-grid street lighting systems was conducted using HOMER Pro software. The results indicated that generating power through PV, piezoelectric, and wind energy was feasible. However, economic evaluation unveiled the infeasibility of employing piezoelectric and wind energy systems due to their elevated investment costs relative to their power generation capabilities. The dynamics of power generation from PV and wind systems, along with street lighting consumption, significantly impacted the dimensions of energy harvesting and storage systems, as well as their economic feasibility. The hybrid PV-wind system exhibited strong economic feasibility.
Some of the metrics are blocked by your
consent settings
Evaluation of harvesting energy from pedestrians using piezoelectric floor tile energy harvester
(2021-11-01)
Yingyong, Phonexai
;
Thainiramit, Panu
;
Jayasvasti, Subhawat
;
Thanach-Issarasak, Nicharas
;
Isarakorn, Don
This study determined the influences of several pedestrian parameters on the amount of energy harvested by a piezoelectric energy harvesting floor tile (EHFT), for the goal of providing a realistic harvested energy specification for an application in a certain pedestrian environment. Experiments were conducts to measure the original harvested energy in a laboratory and the harvested energy under a variety of pedestrian parameter values. The main outcomes were the following: the original, unadjusted harvested energy provided by one pedestrian step obtained in the laboratory was 35 mW<inf>rms</inf>; when ten people, weighing less than 50 kg or over 70 kg, stepped on the floor tile, the harvested energy was about 11.0 mJ and 32.0 mJ, respectively; When 30 people walked or ran over it without any fixed pattern, the harvested energy was about 289.0 mJ and 736.9 mJ, respectively; when 30 people walking in a row, separated by a gap of 0.5, 1, and 1.5 m, walking over the tile one by one, the stored energy was 401.0 mJ, 406.0 mJ, and 452.0 mJ, respectively. To conclude, two pedestrian parameters affected the harvested energy strongly pedestrian body weight and pace (walking or running), but pedestrian density did not affect the harvested energy of our developed EHFT strongly. Therefore, in an adjustment of a laboratory-obtained harvested energy into a realistic specification, the influences of those two pedestrian parameters had to be included, while pedestrian density could be ignored. These findings should be directly useful to new researchers and developers in their effort to formulate a realistic harvested energy specification for their developed EHFT.
Some of the metrics are blocked by your
consent settings
Development of micro-mobility based on piezoelectric energy harvesting for smart city applications
(2020-04-01)
Jettanasen, Chaiyan
;
Songsukthawan, Panapong
;
Ngaopitakkul, Atthapol
This study investigates the use of an alternative energy source in the production of electric energy to meet the increasing energy requirements, encourage the use of clean energy, and thus reduce the effects of global warming. The alternative energy source used is a mechanical energy by piezoelectric material, which can convert mechanical energy into electrical energy, that can convert mechanical energy from pressure forces and vibrations during activities such as walking and traveling into electrical energy. Herein, a pilot device is designed, involving the modification of a bicycle into a stationary exercise bike with a piezoelectric generator, to study energy conversion and storage generated from using the bike. Secondly, the piezoelectric energy harvesting system is used on bicycles as a micro-mobility, light electric utility vehicle with smart operation, providing a novel approach to smart city design. The results show that the energy harvested from the piezoelectric devices can be stored in a 3200 mAh, 5 V battery and power sensors on the bicycle. Moreover, 13.6 mW power can be generated at regular cycling speed, outputting 11.5 V and 1.2 mA. Therefore, the piezoelectric energy harvesting system has sufficient potential for application as a renewable energy source that can be used with low power equipment.
Some of the metrics are blocked by your
consent settings
Practical Test of Contactless Rotational Piezoelectric Generator for Low Speed Application
(2019-05-15)
Sriyuttakrai, S.
;
Isarakorn, D.
;
Boonprasert, S.
;
Nundrakwang, S.
Piezoelectric has drawn significant attention as the smart and straightforward generator as energy harvester for decades. The principle of this theology is to transform the vibration from itself blending become electricity through the piezoelectric effect phenomenal. Piezoelectric has been used to generate electricity through the cantilever form. However, it still hard to apply with the rotational movement. This research represents the practical optimization test of the rotational piezoelectric generator for a low-speed application such as application in ocean wave or wearable device under the speed between 10 to 100 RPM. The design was applied a pushing force of two permanent magnets which, attached at the far end of the piezoelectric cantilever in stator and the rotational disk in rotor. When the application load drives the rotor, the magnetic field from each permanent magnet will repulse each other and generate AC electricity. The experimental result shows the possibility to harvest energy in the range of 5.92 and 234.47 microwatts at 10 RPM (0.167 Hz) and 100 RPM (1.667 Hz) in order.
Some of the metrics are blocked by your
consent settings
Physical and piezoelectric properties of ceramics in the (K0.5Na0.5)NbO3–Bi(Zn0.5Ti0.5)O3–PbTiO3 system
(2018-01-01)
Prasatkhetragarn, Anurak
;
Phetphum, Natthaporn
;
Bongkarn, Theerachai
;
Vittayakorn, Naratip
;
Maensiri, Santi
Piezoelectric ceramic materials in xKNN–yBZT–(1-x-y)PT system, when both of x and y were varied from 0.05 to 0.20, were prepared by a solid state reaction technique. Phase formation, microstructure, density, ferroelectric and piezoelectric properties of the specimens were investigated. The powders were calcined and sintered at the temperature of 900 oC for 6 h and 1050 oC for 2 h, respectively, to obtain single phase perovskite structures. The results indicated that the crystal structure of xKNN–yBZT–(1-xy)PT ceramics system changed from tetragonal to monoclinic phase while the secondary phase of PbTi2O7 was present at the composition of point 5 (0.2KNN–0.1BZT–0.7PT). The densities of the specimens tended to decrease with increasing KNN content. However, the densities and average grain sizes of their ceramics increased with increasing BZT content. In addition, the maximum values of piezoelectric and ferroelectric properties were achieved in 0.05KNN–0.05BZT–0.9PT compound, likely caused by the grain size effects.
Some of the metrics are blocked by your
consent settings
Generation and storage of electrical energy from piezoelectric materials
(2017-07-25)
Songsukthawan, Panapong
;
Jettanasen, Chaiyan
The electrical energy generation and storage from piezoelectric materials are focused and discussed in this paper. This kind of materials is able to directly convert mechanical energy into electrical one, which can be later stored by utilizing energy harvesting technique/circuit. The energy conversion from ambient vibration is indeed nowadays fascinating research area. Due to the compatibility to integrate with electronics and microsystem with high voltage and supporting standalone circuit, it is the most popular electromechanical transducer materials for low power consumption applications, such as wireless and sensors. This paper focuses how to extract energy from piezoelectric materials to be stored in the energy storage device such as battery, in order to later supply electronic/electrical device/equipment. The simulation in MATLAB Simulink is presented and experimental results are also carried out in order to confirm the effectiveness of energy extraction. Consequently, this work may be practical for energy supplying of low power devices.
Some of the metrics are blocked by your
consent settings
Structural, microstructure and electrical properties of La2O3-doped Bi0.5(Na0.68K0.22Li0.1)0.5TiO3 lead-free piezoelectric ceramics synthesized by the combustion technique
(2015-07-01)
Bhupaijit, Pamornnarumol
;
Kornphom, Chittakorn
;
Vittayakorn, Naratip
;
Bongkarn, Theerachai
The effect of firing temperatures on phase formation, microstructure and physical properties of [Bi<inf>0.5</inf>(Na<inf>0.68</inf>K<inf>0.22</inf>Li<inf>0.1</inf>)<inf>0.5</inf>TiO<inf>3</inf>] doped with La<inf>2</inf>O<inf>3</inf> at 0.1 wt% (BNKLLT) ceramics prepared by the combustion method was studied. Glycine was used as fuel and the ratio of raw material (corresponding oxidant metal nitrate) with fuel was about 1:0.56. The samples were calcined at 600-900 °C for 2 h and sintered at 1075-1150 °C for 2 h. The single rhombohedral peroveskite phase of BNKLLT powders was observed from the sample calcined at 750 °C for 2 h. The BNKLLT ceramics exhibited a pure peroveskite phase in all samples. The microstructures of the BNKLLT powders exhibited an agglomerated form while the grain ceramics exhibited a square shape. The average particle size and average grain size increased with increasing firing temperatures. The density, dielectric constant (ε<inf>r</inf> and ε<inf>m</inf>), P<inf>r</inf> and d<inf>33</inf> tended to increase with increasing sintering temperatures up to 1100 °C and then decreased. The maximum density (5.73 g/cm2), maximum dielectric constant (ε<inf>r</inf>~2572 and ε<inf>m</inf>~5536), good ferroelectric properties (P<inf>r</inf>~35.78 μC/cm2 and E<inf>c</inf>~22.42 kV/cm) and highest d<inf>33</inf> (210 pC/N) were obtained by the sample sintered at 1100 °C for 2 h.

KMITL

Browse

Filters

Settings

Sort By

Results per page

Search Results