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Multiphysics vibration FE model of piezoelectric macro fibre composite on carbon fibre composite structures
摘要： This paper presents a finite element (FE) model developed using commercial FE software COMSOL to simulate the multiphysical process of piezoelectric vibration energy harvesting (PVEH), involving the dynamic mechanical and electrical behaviours of piezoelectric macro fibre composite (MFC) on carbon fibre composite structures. The integration of MFC enables energy harvesting, sensing and actuation capabilities, with applications found in aerospace, automotive and renewable energy. There is an existing gap in the literature on modelling the dynamic response of PVEH in relation to real-world vibration data. Most simulations were either semi-analytical MATLAB models that are geometry unspecific, or basic FE simulations limited to sinusoidal analysis. However, the use of representative environment vibration data is crucial to predict practical behaviour for industrial development. Piezoelectric device physics involving solid mechanics and electrostatics were combined with electrical circuit defined in this FE model. The structure was dynamically excited by interpolated vibration data files, while orthotropic material properties for MFC and carbon fibre composite were individually defined for accuracy. The simulation results were validated by experiments with < 10% deviation, providing confidence for the proposed multiphysical FE model to design and optimise PVEH smart composite structures.
关键词： Energy harvesting,Multiphysics,FE,CRFP,MFC,COMSOL
更新于2025-09-23 15:23:52
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Experimental studies and mathematical simulation of intermittent infrared and convective drying of sweet potato (Ipomoea batatas L.)
摘要： Intermittent infrared and convective drying (IIRCD) is a novel drying method that can enhance energy efficiency and quality of dried product. The mechanism of drying using this method is not yet fully understood. Mathematical models that describe the drying process of IIRCD for agricultural crops do not exist. In this study, a physics based mathematical model was developed to understand the mechanism of drying sweet potato using IIRCD. The model was based on shrinkage dependent diffusivity and evaporation phenomenon. COMSOL Multiphysics finite element software was employed for the model simulation. The simulation results of moisture and temperature distribution were validated by experimental drying data. The results fitted closely with experimental data. Drying of sweet potato using IIRCD was found to be more efficient in terms of final product quality compared to convective hot-air drying method.
关键词： quality of dried products,COMSOL,Physics-based model,modelling and simulation
更新于2025-09-23 15:23:52
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High spatial resolution identification of hematoma in inhomogeneous head phantom using broadband fNIR system
摘要： This paper presents a novel method for early detection of hematomas using highly sensitive optical fNIR imaging methods based on broadband photon migration. The NIR experimental measurements of inhomogeneous multi-layer phantoms representing human head are compared to 3D numerical modeling over broadband frequencies of 30–1000 MHz. A finite element method (FEM) simulation of the head phantom are compared to measurements of insertion loss and phase using custom-designed broadband free space optical transmitter (Tx) and receiver (Rx) modules that are developed for photon migration at wavelengths of 670 nm, 795 nm, 850 nm, though results of 670 nm are discussed here. Standard error is used to compute error between 3D FEM modeling and experimental measurements by fitting experimental data to the a√frequency + b . Error results are shown at narrowband and broadband frequency modulation in order to have confidence in 3D numerical modeling. A novel method is established here to identify presence of hematoma based on first and second derivatives of changes in insertion loss and phase (?IL and ?IP), where frequency modulated photons sensitive to different sizes of hematoma is identified for wavelength of 670 nm. The high accuracy of this comparison provides confidence in optical bio-imaging and its eventual application to TBI detection.
关键词： Optical receiver Rx,IL,TBI,Optical transmitter Tx,FEM,fNIR,DE,COMSOL,IP,PDW,Tri-wavelength VCSEL
更新于2025-09-23 15:23:52
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[IEEE 2018 IEEE International Ultrasonics Symposium (IUS) - Kobe, Japan (2018.10.22-2018.10.25)] 2018 IEEE International Ultrasonics Symposium (IUS) - Fast SAW Device Simulation in COMSOL Using the Hierarchical Cascading Method
摘要： Using the hierarchical cascading method for modeling semiconductor devices makes it possible to achieve high accuracy by considering the influence of the details of the structure of the device. In this paper, we consider the simulation of a quantum cascade laser (QCL) with a periodic structure. The simulation is performed using the finite element method (FEM) in the COMSOL Multiphysics software. The results show that the proposed method allows to obtain the characteristics of the device with high accuracy.
关键词： finite element method,quantum cascade laser,COMSOL Multiphysics,simulation
更新于2025-09-23 15:23:52
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[IEEE 2018 International Conference on Emerging Trends and Innovations In Engineering And Technological Research (ICETIETR) - Ernakulam (2018.7.11-2018.7.13)] 2018 International Conference on Emerging Trends and Innovations In Engineering And Technological Research (ICETIETR) - Design, Simulation and Optimization of Metal Oxide Sensor for Ammonia Detection Using Nanowires
摘要： The levels of toxic gases are increasing enormously in the atmosphere, thereby causing adverse effects on the health of all living beings. There are various toxic gases like ammonia, oxides of nitrogen etc., which have to be detected and eliminated even if present in minute concentrations. Metal oxide based sensors is a sought-after technology for various reasons. In this paper, we present a method of detecting ammonia gas using titanium oxide nanowire based gas sensor. The basic principle of operation was adsorption of gas on to the sensing substance. This happens only at elevated temperatures which are provided by a micro hotplate. The aim was to increase the sensitivity of the sensor and to reduce the power consumption. Surface resistance, which varies due to interactions of gas and oxide, was taken as a measure to calculate the concentration in the ambience of sensor. COMSOL multiphysics tool was used for the performance analysis of the sensor.
关键词： metal oxide,COMSOL,nanowire,micro hotplate,toxic gases
更新于2025-09-23 15:22:29
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[IEEE 2018 International Conference on Intelligent and Advanced System (ICIAS) - Kuala Lumpur, Malaysia (2018.8.13-2018.8.14)] 2018 International Conference on Intelligent and Advanced System (ICIAS) - Simulation of Interdigitated Electrodes (IDEs) Geometry Using COMSOL Multiphysics
摘要： Interdigitated Electrodes (IDEs) based sensor in comb-like electrodes structure is also an attractive candidate in gas sensor and biosensor applications, owing to its simple structural design. The sensitivity can be improved based on geometric parameters of the sensor. Hence, in this paper, we study the physical model of the IDEs-based sensor and concern with its geometrical parameters (gap sizes, number of fingers and width of fingers) based on the finite element simulations using COMSOL Multiphysics. The simulation results were used to show the electrical field that generated by the IDEs and compare to other to find the optimum design. Based on the results, the relationship between the geometric parameters and the IDEs performances are studied. The simulation results show that the higher electric fields are generated with the smaller gap size and smaller width of fingers. Besides that, the results show that the gap size and the width of fingers affect the IDEs performance significantly compared to the number of fingers. The IDE with the design 18 fingers, 0.1 mm gap size between fingers and 0.1 mm width of the finger is the optimum design which generates 30.6 kV/m average of electric field magnitude.
关键词： IDEs,COMSOL Multiphysics,geometry parameter
更新于2025-09-23 15:22:29
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Enhancement of the thermal properties of heterojunction perovskite solar cells by nanostructured contacts design
摘要： A perovskite solar cell design is structured and analyzed to investigate the thermal behavior of the cell. In order to perform large scale industrial devices, it is required to understand the effect of varying light intensity, ambient temperature and other sources such as joule heating and non-radiative recombination on the module. Subsequently, the enhancement of thermal stability is accomplished by selecting layers that can contribute to the reduction of operating temperature, such as transparent front electrodes and back electrodes. COMSOL Multiphysics is used to structure and simulate a regular planar heterojunction perovskite solar cell with ITO as a transparent front contact and Au as the back contact. These conventional contacts selection resulted in a maximum temperature of 79 °C for all sources of thermalization. Moreover, nine structures combinations are investigated by using FTO, AZO, Ag, and RGO electrodes. It is found that the best thermal structure is the one that utilizes AZO as a transparent contact and RGO as a back contact. This design achieves a huge reduction in the maximum temperature to ~32 °C; with a total of 59.5% thermal reduction when compared to conventional ITO/Au contacts structure.
关键词： Electrodes,COMSOL,Perovskite solar cell,Thermal properties
更新于2025-09-23 15:21:01
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Low cost flexible pressure sensor using laser scribed GO/RGO periodic structure for electronic skin applications
摘要： Considering electronic skin applications, a pressure sensor based on periodic structure of graphene oxide-reduced graphene oxide (GO-rGO) has been designed and fabricated based on a low cost direct laser writing technique by utilizing the laser diode of DVD drive’s pickup head. The optimization of sensor structure has been performed using computational modelling through Finite Element Method (FEM) in the COMSOL environment. The optimized structure is fabricated based on the deposition of thin layer of GO on the surface of Kapton and the pattering is performed by laser irradiation. The fabricated sensor structure has been characterized structurally and functionally. The results show that the fabrication method is successful in the formation of periodic structure of GO-rGO and the sensor has an acceptable response in the range of 1.5–40 kPa.
关键词： COMSOL,Pressure sensor,Laser scribed,Electronic skin,Graphene oxide
更新于2025-09-23 15:19:57
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Simulation of a stripline beam position monitor of a single electrode for educational purposes
摘要： A beam position monitor is a device used in particle accelerators which determine the position of the beam. In this work, the results obtained by computational simulation and the characterization of a stripline beam position monitor using a single electrode under the action of an electric potential are shown. The electric potential is generated along a copper cable, concentrically located on the monitor, to emulate the particle beam. The simulations were made in COMSOL R(cid:13), and the response of the electric potential, on the electrode, is shown when varying the position of the copper cable on the vertical axis of the monitor. In addition, the teaching value of the device is discussed.
关键词： simulation,particles,Accelerator,COMSOL R(cid:13)
更新于2025-09-19 17:15:36
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LAO-NCS: Laser Assisted Spin Torque Nano Oscillator-Based Neuromorphic Computing System
摘要： Dealing with big data, especially the videos and images, is the biggest challenge of existing Von-Neumann machines while the human brain, benefiting from its massive parallel structure, is capable of processing the images and videos in a fraction of second. The most promising solution, which has been recently researched widely, is brain-inspired computers, so-called neuromorphic computing systems (NCS). The NCS overcomes the limitation of the word-at-a-time thinking of conventional computers benefiting from massive parallelism for data processing, similar to the brain. Recently, spintronic-based NCSs have shown the potential of implementation of low-power high-density NCSs, where neurons are implemented using magnetic tunnel junctions (MTJs) or spin torque nano-oscillators (STNOs) and memristors are used to mimic synaptic functionality. Although using STNOs as neuron requires lower energy in comparison to the MTJs, still there is a huge gap between the power consumption of spintronic-based NCSs and the brain due to high bias current needed for starting the oscillation with a detectable output power. In this manuscript, we propose a spintronic-based NCS (196 × 10) proof-of-concept where the power consumption of the NCS is reduced by assisting the STNO oscillation through a microwatt nanosecond laser pulse. The experimental results show the power consumption of the STNOs in the designed NCS is reduced by 55.3% by heating up the STNOs to 100?C. Moreover, the average power consumption of spintronic layer (STNOs and memristor array) is decreased by 54.9% at 100?C compared with room temperature. The total power consumption of the proposed laser assisted STNO-based NCS (LAO-NCS) at 100?C is improved by 40% in comparison to a typical STNO-based NCS at room temperature. Finally, the energy consumption of the LAO-NCA at 100?C is expected to reduce by 86% compared with a typical STNO-based NCS at the room temperature.
关键词： COMSOL multiphysics,power efficient,laser,spin torque nano-oscillators,neuromorphic computing system
更新于2025-09-19 17:13:59