Effect of Mesh Size of Finite Element Analysis in Modal Analysis for Periodic Symmetric Struts Support

Liu, Wei Bing; Gheni, Mamtimin; Yu, Lie

doi:10.4028/www.scientific.net/kem.462-463.1008

Cited by 11 publications

(4 citation statements)

References 4 publications

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“…As seen in figure 6, It is found that the maximum error in resonant frequency does not exceed 0.6%, 0.07% and 1.5% for longitudinal, torsional, and flexural modes respectively when using 6 mm coarse mesh size and 1 mm fine mesh size which confirms the insignificance of the mesh size on resonant frequency [44][45][46]. So, the number of elements is about 20 000 elements which is sufficient for better convergence with shorter solution time.…”

Section: Mesh Distributionmentioning

confidence: 65%

Design optimization and experimental verification of ultrasonic stack for micro hot embossing of polymers

Abdel-Aleem,

Fath El-Bab,

Yoshino

et al. 2024

J. Micromech. Microeng.

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Ultrasonic micro hot embossing (UMHE) is a prominent technique used in numerous sectors to produce micro parts since it is cheaper, faster, and more accurate. Amplitude uniformity is a crucial parameter in UMHE in order to manufacture micro parts with accurate dimensions and high-quality surfaces, even though limited research has been conducted on the uniformity of ultrasonic amplitude at the horn face during the embossing process. This paper presents an experimental and numerical study for designing an ultrasonic transducer and horn tailored to the micro hot embossing of polymer micro parts. A finite element (FE) simulation model combined with the Taguchi method has been developed to optimize the horn geometry and maximum amplitude uniformity. The Taguchi orthogonal array of 25 design runs has been generated and simulated using the developed FE modal analysis model, and then the optimized geometry was used to fabricate the horn. Applied torque and operating time calibrate and evaluate the transducer vibration characteristics. Experimental and simulation results revealed that the fabricated ultrasonic transducer and horn of a straight microfeature has a natural frequency of 28.8 kHz and has an 11 µm average peak-to-peak amplitude with 0.963 amplitude homogeneity along the microfeature face. The achieved frequency separation was greater than 0.85 kHz, whereas the gain ratio was 1.2. The design methodology developed in this paper showed great potential and has been numerically validated for various microfeature shapes across the horn face. Consequently, it can be applied to various ultrasonic applications beyond UMHE.

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Section: Mesh Distributionmentioning

confidence: 65%

Design optimization and experimental verification of ultrasonic stack for micro hot embossing of polymers

Abdel-Aleem,

Fath El-Bab,

Yoshino

et al. 2024

J. Micromech. Microeng.

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“…It has been shown in several studies that mesh size affects the accuracy of findings obtained using FE Analysis in several studies. By varying element size and type, Liu et al [32] obtained different results. Figures 18 show a comparison between three mesh sizes: 30, 40, and 50.…”

Section: Effect Of Mesh Size On Fe Analysis Of Beammentioning

confidence: 99%

A Study of the Structural Behavior of Recycled-Concrete Haunched Beams with Web Opening

Mosa¹,

Abbas²

2022

MMEP

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The structural behavior of Reinforced Concrete Haunched Beams (RCHBs) was investigated in this study. One prismatic control beam and fourteen Haunched Beams (HBs) were used in the experimental test and numerical analysis. The variables considered are Recycled Concrete Aggregate (RCA) ratio which is taken as 0, 30 %, and 60 %, opening shape (square and circular with the same area of 4560 mm2), and haunch angle (α) of 6.34° and 9.46°. The samples of dimensions (1750x200x300) mm were tested under a two-point load. The samples were simulated numerically using the Abaqus/CAE tool. The experimental outcomes show that using 30% RCA decreased the resistance by 8.24% - 26.45% compared with the control sample. While at 60% RCA, the resistance decreased by 16.35% - 34.71%. HBs with α=6.34° give a strength quite close to the control beam (PN) by 1.93%, while α=9.46° decreases the strength by 12.94% compared with PN. Compared with the solid beam, square holes in HBs provide a strength reduction range of 5.83% - 18.79% for α=6.34° and α=9.46°, respectively. The beams with circular apertures have a resistance decrease of about 3.43% - 14.70%, which corresponds to α=6.34° and α=9.46°. The numerical findings were 8.41% of the experimental data.

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“…4 mm is enough sizing, compared to the overall dimension. It is not required to be smaller enough because the corner region is not the most concern for stress or displacement analysis [14].…”

Section: Numerical Simulationmentioning

confidence: 99%

Frame modal analysis for an electric three-wheel vehicle

et al. 2018

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The alternative electric vehicle for delivery (E-Trike) is a developing three-wheel electric vehicle for goods delivery. Small size and its three-wheel mobility are required for flexible manoeuvrability on urban space due to traffic, parking and alley road. In this study, three different Alpha frames (Alpha-0, Alpha-1, and Alpha-2) of E-Trike vehicle are analysed using numerical simulation LS-DYNA. This study is conducted to obtain the modal response E-Trike vehicle. Eigenvalues of dynamics properties are investigated to avoid a resonance on excitation frequency. LS-DYNA implicit simulation used for simulating quadrangular shell element for the surface geometry of the frames. Boundary conditions are applied to the steering and suspension joints represent the real field. The result shows the amplitudes and the natural frequencies of Alpha frames. Bending mode and torsion mode can be determined. Based on the simulation, there is a pattern of vibration modes. Alpha-2 which is the latest version of three configurations has better response on vibration modes. There is about 3% reduction of vibration amplitude at Alpha-2 than Alpha-0 and Alpha-1. Natural frequency response for each mode occurs at similar range. Furthermore, a shifted natural frequency of Alpha-2 combination mode occurs due to addition of the stretched frame.

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Effect of Mesh Size of Finite Element Analysis in Modal Analysis for Periodic Symmetric Struts Support

Cited by 11 publications

References 4 publications

Design optimization and experimental verification of ultrasonic stack for micro hot embossing of polymers

Design optimization and experimental verification of ultrasonic stack for micro hot embossing of polymers

A Study of the Structural Behavior of Recycled-Concrete Haunched Beams with Web Opening

Frame modal analysis for an electric three-wheel vehicle

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