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[IEEE 2018 25th International Conference on Mechatronics and Machine Vision in Practice (M2VIP) - Stuttgart, Germany (2018.11.20-2018.11.22)] 2018 25th International Conference on Mechatronics and Machine Vision in Practice (M2VIP) - A Soft Ring-shaped Actuator: FE Simulation and Motion Tracking
摘要： A soft ring-shaped actuator is inspired by the human stomach. This actuator can contract inward, mimicking the movements of the human stomach. It can benefit the research field of medical science and food engineering. In this paper, we investigate the deformation of such actuator employing finite-element simulation and motion tracking. Simulations are carried out to examine the influence of different pressure on the performance of the actuator. Motion tracking system is applied to track the mid-points on the deformed surface when the actuator is under pressurisation. The results show that the actuator can achieve axisymmetric contraction when inflated. The principal movements of mid-points are on the horizontal plane, whereas the change in the axial direction is negligible. This investigation can benefit the understanding of the profile of the deformed membrane and the construction of the mathematical modelling.
关键词： finite-element simulation,ring-shaped actuator,deformation,motion tracking,soft robotics
更新于2025-09-23 15:22:29
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Study on laser irradiation temperature field of carbon fiber reinforced plastic composites
摘要： Based on Abaqus software, the temperature profiles during laser heating CFRP materials in different fiber directions was investigated in this research. The 3D temperature distribution and temperature history of laminates with different ply directions were analyzed and compared through the homogenous model. It is found that the focusing characteristics of laser causes a large temperature gradient. Meanwhile, the temperature field of CFRP laminate extends toward the direction of fibers because of the large axial thermal conductivity of carbon fibers. The thermal conduction in the thickness direction is poor, so the lower layer will not reach the melting temperature. In order to verify the validity of the model, a real-time temperature field measurement device consisting of thermal imager and thermocouples was built. The results show that the model can effectively simulate the temperature field of composite materials irradiated by laser.
关键词： carbon fiber reinforced plastic composites,laser,finite element simulation,temperature field
更新于2025-09-23 15:19:57
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Effect of processing parameters on the size of molten pool in GH3536 alloy during selective laser melting
摘要： A combination of the finite element simulation and experimental measurement is proposed to study the influence of laser power and scanning velocity on the molten pool size in the selective laser melting (SLM) of GH3536 alloy. The results show that line energy density and molten pool size exhibit linear growth relationship within the scope of the study parameters. In addition, several GH3536 alloy samples are fabricated by SLM technology with different parameters. All SLM samples are used for metallographic experiment to measure the molten pool size. The result shows that experimental measurements are in good agreement with the simulation predictions.
关键词： molten pool size,experimental measurement,finite element simulation,GH3536 alloy,selective laser melting
更新于2025-09-23 15:19:57
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Round-tower plasmonic optical microfiber tip for nanofocusing with a high field enhancement
摘要： A round-tower (RT) plasmonic tip based on an optical microfiber for nanofocusing is proposed. Its operation principle is systematically analyzed by theoretical methods. Four operation regions of the theoretical model of the plasmonic tip are identified for the first time in this study. In addition, the near-field performances of the plasmonic optical microfiber tip are investigated by a finite-element simulation. The results reveal that the field enhancement at the tip apex can be improved by adjusting the slope angle of its surface plasmon polariton region. Remarkably, the proposed RT plasmonic tip can achieve a significantly enhanced field at the tip apex and simultaneously focus the optical spot to a few nanometers. The characteristics of superfocused optical spot and ultrahigh field enhancement are promising for applications in scanning near-field optical microscopy, optical recording, nanolithography, and biosensing.
关键词： Plasmonic tip,Optical microfiber,Finite-element simulation,Nanofocusing
更新于2025-09-12 10:27:22
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Numerical investigation of Transient Temperature Field on the Selective Laser Melting process with Al6063
摘要： The finite element simulation of the selective laser melting process with Al6063 metal powder was carried out by using ABAQUS. The loading of the laser Gaussian moving heat source is realized, and a model of the three-dimensional transient temperature field is established. The effects of scanning speed and scanning pitch on temperature distribution and temperature changes on different scanning channels were investigated. The simulation results show that due to the heat accumulation effect and heat conduction, the previous scan will have effect on the surrounding powder, which results the rise of temperature. Different scanning speed and the scanning pitch have influence on the temperature distribution. As the scanning speed increases, the temperature gradually decreases, and the increase in the scanning pitch also lead to lower temperature of the powder layer.
关键词： Finite Element Simulation,Transient Temperature Field,ABAQUS,Selective Laser Melting,Al6063
更新于2025-09-12 10:27:22
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Multi-Objective Optimization of Residual Stress and Cost in Laser Shock Peening Process Using Finite Element Analysis and PSO Algorithm
摘要： Laser shock peening (LSP) is an effective process utilized for surface enhancement of metal parts so that generating compressive residual stresses (RS) on the surface improves fatigue life of the material. The main affecting parameters on surface negative residual stress are laser power, laser beam size and shape, peening pitch and pattern. Varying these parameters alters the magnitude and depth of RS as well as the cost of LSP. An integrated method for simulation of optimum LSP process is presented in this paper, in which Particle Swarm Optimization (PSO) technique was employed utilizing Python coding in ABAQUS finite element environment to maximize the uniformity of compressive RS and minimize LSP cost on an Inconel 718 super-alloy specimen. The mentioned affecting parameters were selected as optimization parameters, and minimum acceptable amounts and depth of compressive RSs were two main design constraints. Simulation results were compared with previously published experimental ones, and optimum LSP variables were finally determined and presented for certain amount of design constraints. It was revealed that, relatively small circular laser beam, shot by square scanning pattern, leads to generate the most uniform RS with minimum LSP cost.
关键词： Particle swarm multi-objective optimization,Laser shock peening,Residual stress,Python coding,Finite element simulation
更新于2025-09-12 10:27:22
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Effect of Laser Welding Sequences on Residual Stresses and Distortion of DP600 Steel Joints
摘要： Different materials have been welded by laser beam. This process allows to obtain high quality welds with lower thermal effect. Laser beam welding produces narrow and high penetration welds without filler material. However, this process modifies the mechanical and microstructural properties of the welded joints. Therefore, this is currently a research topic, mainly using Advanced High Strength Steel (AHSS). These materials are used in the automotive industry. As a result, it is important to study the thermometallurgical and mechanical behavior of welded steels. In addition, a tool used to approximate the thermal effect in the fusion zone (FZ) and heat affected zone (HAZ) has been the computational numerical simulation. In this work, two butt joints of DP600 steel plates of 200 mm × 150 mm and 2 mm thickness with different welding sequences were simulated using the SYSWELD finite element software. The results of both coupons were compared and it was determined that the distortion and residual stresses decreased in the second coupon by applying a different welding sequence with equal heat input.
关键词： SYSWELD,Laser welding,Finite element simulation,Residual stresses,DP600 steel,Distortion
更新于2025-09-12 10:27:22
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Complex- <i>k</i> modes of plasmonic chain waveguides
摘要： Nanoparticle chain waveguide based on negative-epsilon material is investigated through a generic 3D finite-element Bloch-mode solver which derives complex propagation constant (k). Our study starts from waveguides made of non-dispersive material, which not only singles out ‘waveguide dispersion’ but also motivates search of new materials to achieve guidance at unconventional wavelengths. Performances of gold or silver chain waveguides are then evaluated; a concise comparison of these two types of chain waveguides has been previously missing. Beyond these singly-plasmonic chain waveguides, we examine a hetero-plasmonic chain system with interlacing gold and silver particles, inspired by a recent proposal; the claimed enhanced energy transfer between gold particles appears to be a one-sided view of its hybridized waveguiding behavior—energy transfer between silver particles worsens. Enabled by the versatile numerical method, we also discuss effects of inter-particle spacing, background medium, and presence of a substrate. Our extensive analyses show that the general route for reducing propagation loss of e.g. a gold chain waveguide is to lower chain-mode frequency with a proper geometry (e.g. smaller particle spacing) and background material setting (e.g. high-permittivity background or even foreign nanoparticles). In addition, the possibility of building mid-infrared chain waveguides using doped silicon is commented based on numerical simulation.
关键词： plasmonics,periodic structure,computational electromagnetics,waveguide,photonic band structure,finite-element simulation
更新于2025-09-11 14:15:04
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The effect of piezoelectric ceramic volume fraction on the thickness vibration characteristics of 1-3 piezocomposites
摘要： The thickness vibration mode of the piezoelectric composite is the most common operation mode in transducer applications. The study on the thickness vibration characteristics plays a key role in application.In this paper, the influence of volume fraction of piezo-ceramic on the thickness vibration characteristics of 1-3 piezoelectric composites was investigated. Through finite element analysis and simulation, the relationship between vibration performance parameters and the ceramic volume fraction of composites was obtained. The samples with volume fraction of 0.2 (cid:1) 0.6 were prepared by cutting and filling and tested by Impedance Analyzer.Experimental and simulation results were matched by comparison.
关键词： electromechanical coupling factor,finite element simulation,conductance,1-3 piezocomposite
更新于2025-09-11 14:12:44
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[Micro/Nano Technologies] Micro and Nano Fabrication Technology Volume 1 || Precision Molding of Microstructures on Chalcogenide Glass for Infrared Optics
摘要： Chalcogenide glass (ChG), as an alternative material in place of single-crystal germanium, is increasingly used in thermal imaging, night vision, and infrared guidance systems, etc., and microstructure array on the infrared component is widely used in micro-optical systems owing to their excellent formability through precision glass molding (PGM), which can achieve low cost and high efficiency compared with other microstructural manufacturing technologies. To describe the thermomechanical properties of ChG, the viscoelastic constitutive of ChG is modeled and used in finite element simulation to study the influence of process parameters on the forming stress. The processing parameters are studied to reduce the occurrence of microdimples and optimize the molding conditions. Finally, microstructure arrays are molded using spherical ChG preform and the optimal molding materials are identified.
关键词： Microdimples,Finite element simulation,Precision glass molding,Microstructure array,Chalcogenide glass
更新于2025-09-09 09:28:46