Investigation of Mesh Size Effect on Dynamic Behaviour of an Assembled Structure with Bolted Joints using Finite Element Method

Omar, Roaimah; Rani, M. N. Abdul; Yunus, M. A.; Isa, Ahmad Azlan Mat; Mirza, W. I. I. Wan Iskandar; Zin, M. S. Mohd; Roslan, Liyana

doi:10.15282/ijame.15.3.2018.22.0437

Cited by 23 publications

(4 citation statements)

References 15 publications

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“…Modal analysis on the bed was performed under free-free conditions, and the corresponding modal parameters were determined by neglecting the rigid body modes. One of the most fundamental challenges in FEM is selecting the correct mesh size [20,21]. Large elements may yield less accurate results, while small elements may yield better results.…”

Section: Methodsmentioning

confidence: 99%

Modal Analysis Of CNC Milling Machine Bed Made Of Different Alloys Using Finite Element Modeling

Omar,

Abdul Halim,

Othman

2023

JMPM

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Selama bertahun-tahun, ada keperluan kuat pada prediksi perilaku dinamis dari struktur alat mesin dengan mengidentifikasi parameter modal. Machine bed adalah salah satu komponen terpenting dalam mesin frais CNC karena fungsinya secara signifikan memengaruhi kualitas produk akhir. Bed berfungsi sebagai fondasi alat berat, menopang semua komponen penting alat berat. Ini juga digunakan untuk menghindari deformasi yang disebabkan oleh beban statis dan dinamis. Penelitian ini bertujuan untuk membandingkan parameter modal dari beberapa paduan yang berfungsi sebagai bahan alas, seperti baja karbon, baja paduan, dan baja tahan karat, dengan bahan yang digunakan pada umumnya. Model tiga dimensi dan analisis modal machine bed dilakukan menggunakan perangkat lunak Autodesk Inventor. Baja paduan menunjukkan nilai frekuensi alami tertinggi dibandingkan dengan bahan lain karena modulus Young yang tinggi dan kerapatan yang rendah. Bentuk mode serupa dengan besaran bervariasi teramati di semua bahan. Menurut temuan tersebut, baja paduan bisa menjadi alternatif yang layak untuk besi tuang dalam struktur tempat tidur peralatan mesin. Over the years, there has been a strong emphasis on predicting the dynamic behavior of machine tool structures by identifying modal parameters. The machine bed is one of the most significant components in a CNC milling machine because its functionality significantly affects the final product's quality. The bed acts as the machine's foundation, supporting all of the machine's critical components. It is also utilized to avoid deformation caused by static and dynamic loads. This study aims to compare the modal parameters of several alloys used as bed materials, such as carbon steel, alloy steel, and stainless steel, to those of a common material. A three-dimensional model and modal analysis of the bed were conducted in Autodesk Inventor software. Alloy steel shows the highest values of natural frequencies compared to other materials due to its high Young’s modulus and low density. Similar mode shape is observed with varied magnitude in all the materials. According to the findings, alloy steel could be a viable alternative to cast iron in machine tools bed's structure

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Section: Methodsmentioning

confidence: 99%

Modal Analysis Of CNC Milling Machine Bed Made Of Different Alloys Using Finite Element Modeling

Omar,

Abdul Halim,

Othman

2023

JMPM

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“…The setup was designed as to that of the FE model. The EMA was performed by hanging the plate with two soft springs to imitate a free-free configuration [22]. A single 10 mV/g uniaxial accelerometer was used to measure the dynamic data, and a 21.7mV/N impact hammer was used for the excitation.…”

Section: Finite Element Modellingmentioning

confidence: 99%

Estimating Rotational Frequency Response Function Using Mode Expansion and Frequency Response Function Synthesis Method

Mirza¹,

Rani²,

Yunus³

et al. 2021

IJAME

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The rotational frequency response function (RFRF) plays a crucial role in increasing the accuracy of the calculated results of the frequency-based substructuring method. However, RFRFs are often omitted due to the difficulties in the measurement process and limitations of the equipment. This paper presents a scheme of estimating the rotational FRF of an irregular plate structure using the FE model reduction and expansion method. The reduced FE model was introduced using the improved reduction system (IRS) and expanded to the experimental modal model (EMA model) using the system reduction and the expansion (SEREP) method. The FRF expanded method was then employed to derive the translational and rotational FRFs from the expanded EMA model. The accuracy of the expanded FRFs was evaluated with the EMA model of the irregular plate. It was found that the translational and rotational FRFs estimated from the proposed scheme were in good agreement with the EMA counterparts. Furthermore, the patterns of the estimated RFRFs were well correlated with the EMA RFRFs. This work shows that the proposed scheme may offer an attractive alternative way of accurately determining the RFRs of complex structures or structural components.

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“…The element size adopted in this study was 5 mm. The size was selected after evaluating several convergent tests performed on the FE model with different mesh sizes [20]. Figure 2 shows the FE model of the bolted structure.…”

Section: Fe Modelling and Analysismentioning

confidence: 99%

Representation of bolted joints in a structure using finite element modelling and model updating

Omar¹,

Rani²,

Yunus³

2020

JMES

Self Cite

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Efficient and accurate finite element (FE) modelling of bolted joints is essential for increasing confidence in the investigation of structural vibrations. However, modelling of bolted joints for the investigation is often found to be very challenging. This paper proposes an appropriate FE representation of bolted joints for the prediction of the dynamic behaviour of a bolted joint structure. Two different FE models of the bolted joint structure with two different FE element connectors, which are CBEAM and CBUSH, representing the bolted joints are developed. Modal updating is used to correlate the two FE models with the experimental model. The dynamic behaviour of the two FE models is compared with experimental modal analysis to evaluate and determine the most appropriate FE model of the bolted joint structure. The comparison reveals that the CBUSH element connectors based FE model has a greater capability in representing the bolted joints with 86 percent accuracy and greater efficiency in updating the model parameters. The proposed modelling technique will be useful in the modelling of a complex structure with a large number of bolted joints.

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Investigation of Mesh Size Effect on Dynamic Behaviour of an Assembled Structure with Bolted Joints using Finite Element Method

Cited by 23 publications

References 15 publications

Modal Analysis Of CNC Milling Machine Bed Made Of Different Alloys Using Finite Element Modeling

Modal Analysis Of CNC Milling Machine Bed Made Of Different Alloys Using Finite Element Modeling

Estimating Rotational Frequency Response Function Using Mode Expansion and Frequency Response Function Synthesis Method

Representation of bolted joints in a structure using finite element modelling and model updating

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