Structural dynamic investigation of frame structure with bolted joints

Izham, M H N; Abdullah, Nur Azam; Zahari, S.N.; Sani, M. S. M.

doi:10.1051/matecconf/20179001043

Cited by 16 publications

(7 citation statements)

References 13 publications

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“…Confirmation for the accuracy of a result obtained in finite element analysis is usually validated by EMA [20][21][22]. The most regularly used technique of conducting the experiment is by using impact hammer as an actuator, an accelerometer as the sensor and a Fast Fourier Transform (FFT) analyzer to obtain the system Frequency Response Function (FRFs) [23].…”

Section: Experimental Modal Analysismentioning

confidence: 99%

Model Updating of Friction Stir Welding for Aluminium and Magnesium Plate Structure

Nazri

Sani

Mansor

et al. 2018

MATEC Web of Conferences

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Abstract. Friction stir welding (FSW) of aluminium and magnesium alloys face high demands in automotive and aerospace application due to its advanced and lightweight properties. FSW is an emerging solid state joining process in which the material that is being welded does not melt and recast. The main objectives of this project are to perform model updating based on finite element analysis (FEA) and experimental modal analysis (EMA) of dissimilar material of aluminium alloy AL 7075 and magnesium alloy AZ 31B. Modal properties such as natural frequencies, mode shapes are obtained and compared between FEA and EMA. The discrepancies of first five modes natural frequencies are below than 10% and the model updating have been conducted to minimize the error between two methods. This model updating are based on sensitivity analysis in order to make sure which parameters are given more influence in this structural dynamic analysis. Young's modulus and Poisson's ratio both materials are selected in the model updating process. After perform model updating, total average error of the natural frequencies of dissimilar friction stir welding plate is improved significantly.

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Section: Experimental Modal Analysismentioning

confidence: 99%

Model Updating of Friction Stir Welding for Aluminium and Magnesium Plate Structure

Nazri

Sani

Mansor

et al. 2018

MATEC Web of Conferences

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“…The simulation determines the maximum stress value and deflection of the low loader chassis structure. Analytical study about the bolted joint that is used to to gain the correlation data between experimental modal analysis (EMA) and finite element method (FEM) [19]. It can be assumed that the different results between both methods can be minimized by optimizing the sensitivity of the analysis.…”

Section: Introductionmentioning

confidence: 99%

Stress Analysis Simulations of Welded and Bolted Joints Method for Full Steel and Composite-Steel Chassis Structure of Electric Low Floor Medium Bus

et al. 2020

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Stress analysis of welded steel-to-steel, bolted steel-to-steel, and bolted composite-steel chassis in an electric low floor medium bus structure is presented in this paper. The analysis was carried out on the condition that is when the bus is full of load in idle/static. This condition reflects the situation of the vehicle in full load with passengers and components, which is important to be analyzed to anticipate the unwanted structural failure of the chassis. Finite Element Method (Harmonic response simulation) is used to investigate the structural behavior of both welded and bolted methods. Several parameters such as 2 Hertz for the maximum frequency, 5000 kg for the total vehicle weight, and the uniform distribution of load are used for this study to simulate the simplified, real application in the real world. The first comparison is between the welded and bolted steel-to-steel chassis which results in the bolted method has a lower stress value by the difference of 4.3 MPa in the joint section than the welded joint. This means that the bolted joint is more recommended than welded for the use as an electric low floor medium bus and has the potential to be optimized further. In terms of reducing the weight of the chassis structure, then lightweight material (carbon fiber composite) is used to replace the full steel chassis to be a composite-steel chassis. The use of this hybrid material depicts the stress value of 61.5 MPa in the joint area, this value is still far below the limit of carbon fiber that is 3200 MPa makes this bolted composite-steel is considerably safe in full load condition as an electric low floor medium bus structure. Using this hybrid bolted composite-steel chassis structure also reduces the total chassis weight by about 22.7 % compared to the full steel chassis structure, thus one could expect to extend the mileage of electric vehicles by more than 20 %

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“…To model and solve the vibration problems numerically, FEA method was adopted in this study since it has become the most favourable technique in parallel to the development of high computing capability paired with recent advances in numerical methods. As reported by [10], FEA was used in the industry to gain a confidence level in the early design stage, and to analyse the product performance, as well as to predict the dynamic characteristics of the structure definitely.…”

Section: Introductionmentioning

confidence: 99%

“…In order to verify either the constructed FE model is feasible to represent the actual dynamic behaviour produced by real structure or not, numerous researchers used correlation processes to compare the modal data obtained from FEA with measured counterparts [3,9,10,13,14].From the correlation processes, the level of discrepancy between prediction results and its experimental data were then calculated. The outstanding joint model among RBE2, CBAR, CBEAM and CELAS model with less error percentage was chosen to be treated with FE model updating.…”

Section: Introductionmentioning

confidence: 99%

“…As mentioned by [16], the parameters selected should be justified by engineering understanding of the structure, and the number of parameters should be kept to a minimum to avoid ill-conditioning problems. A number of published papers managed to reduce the discrepancies between predicted results of FEA and measured data from EMA using FE model updating with MSC Nastran optimization algorithm, SOL200 [2,9,10,13,17].…”

Section: Introductionmentioning

confidence: 99%

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Finite Element Modelling and Updating of Welded Thin-Walled Beam

Fouzi

Jelani

Nazri

et al. 2018

IJAME

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This article concentrates on the finite element (FE) modelling approach to model welded thin-walled beam and the adoption of model updating technique to enhance the dynamic characteristic of the FE model. Four different types of element connectors which are RBE2, CBAR, CBEAM and CELAS format are used to construct the FE model of welded structure. Normal mode analysis is performed using finite element analysis (FEA) software, MSC Patran/Nastran to extract the modal parameters (natural frequency and mode shape) of the FE model. The precision of predicted modal parameters obtained from the four models of welded structure are compared with the measured counterparts. The dynamic characteristics of a measured counterpart is obtained through experimental modal analysis (EMA) using impact hammer method with roving accelerometer under free-free boundary conditions. In correlation process, the CBAR model has been selected for updating purposes due to its accuracy in prediction with measured counterparts and contains updating parameters compared to the others. Ahead of the updating process, sensitivity analysis is made to select the most sensitive parameter for updating purpose. Optimization algorithm in MSC Nastran is used in FE model updating process. As a result, the discrepancy between EMA and FEA is managed to be reduced. It shows the percentage of error for updated CBAR model shrinks from 7.85 % to 2.07 % when compared with measured counterpart. Hence, it is found that using FE model updating process provides an efficient and systemic way to perform a feasible FE model in replicating the real structure.

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Structural dynamic investigation of frame structure with bolted joints

Cited by 16 publications

References 13 publications

Model Updating of Friction Stir Welding for Aluminium and Magnesium Plate Structure

Model Updating of Friction Stir Welding for Aluminium and Magnesium Plate Structure

Stress Analysis Simulations of Welded and Bolted Joints Method for Full Steel and Composite-Steel Chassis Structure of Electric Low Floor Medium Bus

Finite Element Modelling and Updating of Welded Thin-Walled Beam

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