Acoustic analysis of lightweight auto-body based on finite element method and boundary element method

Zhu, Ping; Liu, Xinhua; Lin, Zhongqin; Zhang, Yan

doi:10.1007/s11465-007-0017-7

Cited by 3 publications

(2 citation statements)

References 4 publications

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“…The reinforcing fibres that are widely used in engineering include glass fibres, carbon fibres, aramid and basalt fibres. 12 Among them, the mechanical properties of carbon fibres, such as specific modulus, tensile modulus and specific strength, have very significant advantages compared with other fibres, and with the rapid expansion of the application field of composite materials, the production process of carbon fibre filament and the woven fabric has been optimised and the production efficiency has been increasing, and its cost will be reduced in the future. 13 This paper intends to choose carbon fibre (Material parameters: 98% carbon content, bi-directional weave, weft modulus 400 GPa, warp modulus 30 GPa, filament diameter 7 µm, fibre type is PAN, thickness is 0.3 mm, elongation at break 4%), as a fibre material for the body of intelligent vehicles.…”

Section: Cfrp Smartness Car Body Designmentioning

confidence: 99%

Carbon fibre reinforced plastic for smartness car body design, practice and simulation

Hou

Lin

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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With the vigorous implementation of national policies and regulations such as energy-saving and emission reduction, lightweighting has become one of the trends in the development of the automotive industry, which is of great significance in reducing energy consumption and increasing the range of vehicles. This paper is based on a newly developed smartness car body designed for elderly users, which aims to solve the problem of mobility and companionship for the elderly, with a maximum speed of 20 km/h and a weight requirement of 45 kg or less. This paper focuses on the lightweight technology of the body of the smartness car, using carbon fibre composite material as the carrier, and using simulation analysis combined with experimental testing to systematically study the body material selection, structure and process, and to carry out force analysis, finite element analysis and modal analysis on the designed body, verifying that the body of the smartness car meets the lightweight design requirements.

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Section: Cfrp Smartness Car Body Designmentioning

confidence: 99%

Carbon fibre reinforced plastic for smartness car body design, practice and simulation

Hou

Lin

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…The law of water penetration has been understood from engineering approximation way, but the theoretical solutions are still far from reach as to the complexity of water properties [1,2]. In the research of concrete penetration, dynamic cavity expansion models are used to simplify the targets analysis and to formulate the penetration models [3,4].…”

Section: Introductionmentioning

confidence: 99%

Drag Force Analysis of Spheres Penetrating Gelatin Based on Surface Integral

Liu

2011

AMM

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A new method based on surface integral is presented in the research of mechanical mechanism of spheres penetrating gelatin. On the assumption that each wetted area element is applied with dynamic force perpendicular to the surface, frictional force parallel to the surface and material resistance which is a constant, the resultant force applied on spheres was integrated containing three unknown coefficients. Transparent gelatin was used in the experiments and steel spheres were fired at speed around 800m/s. High speed cameras got the position data of the penetrating spheres. The uncertain coefficients in the movement equations were determined with these data. The equations were solved in analytical forms. Experiments show that the coefficients are constant for spheres with different radiuses. Calculation results demonstrate that the mechanical model is good to predict the movement of spheres in gelatin.

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Structural and Vibro-Acoustics Optimization of a Car Body Rear Part

Citarella

Landi

Caivano³

et al. 2023

Applied Sciences

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The perceived vibro-acoustic comfort, inside the passenger compartment, under driving conditions, is strictly related to the car body torsional behavior. The aim of this work was to identify which parts of a car body most influence the first torsional mode, in order to modify them and acquire an increase in such car body natural frequency. It was also intended to exploit the great potential of 3D printing that allows an increase in the complexity of component shapes, with an acceptable compromise with respect to production costs. A design and material (from steel to aluminum) change of a car body rear part, which was identified as the structural part of the car body with the most relevant impact on the frequency of the first torsional mode, was assessed in terms of structural and vibro-acoustic performances. In particular, with the constraint of increasing the structural and vibro-acoustic performances and, at the same time, minimize the weight of the structure itself, geometric, structural (e.g., type of connections), and material changes of the car body rear part were assessed. Working on a car model dating back to 2008, which was already compliant with structural and vibro-acoustic regulatory norms, an increase of 2 Hz on the first torsional mode frequency of the Trimmed Body model was obtained. In parallel, a weight reduction in the optimized components was also gained. It was also requested to lower the cabin sound pressure levels, optimizing the vibro-acoustic transfer functions from the accelerations at engine mounts and suspension attachment points to the cabin inside. It was shown how the combined use of advanced topological and structural optimization tools, with the capabilities of an unconventional manufacturing technology, such as 3D printing in aluminum, could guarantee an increase in the vibro-acoustics and structural car performances, also gaining a weight reduction.

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Acoustic analysis of lightweight auto-body based on finite element method and boundary element method

Cited by 3 publications

References 4 publications

Carbon fibre reinforced plastic for smartness car body design, practice and simulation

Carbon fibre reinforced plastic for smartness car body design, practice and simulation

Drag Force Analysis of Spheres Penetrating Gelatin Based on Surface Integral

Structural and Vibro-Acoustics Optimization of a Car Body Rear Part

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