13 Result(s)
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Article
Microstructural design of rigid porous materials using a Bayesian optimization method
This study presents a methodology for designing the periodic unit cell (PUC) to optimize the sound absorption properties of rigid porous materials using Bayesian optimization (BO). BO is a machine learning alg...
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Article
Acoustic study on the thermal aging of sound-absorbing polyurethane foam
This research aims to explore the degradation process of sound-absorbing polyurethane foam (PUF) and create a dependable aging model. To accomplish this, accelerated testing was carried out in a heat chamber u...
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Article
Experimental evaluation models of vehicle ride quality for two vibration types: primary ride and secondary ride
This study proposes an experimental evaluation method for vehicle ride quality. In contrast to the conventional method, which is dependent on the fluctuating perceptions of a few experts, the proposed method r...
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Article
A study on sound quality of vehicle engine sportiness using factor analysis
For those who enjoy driving, the “sportiness” the engine sound is an important point to consider. However, owing to its abstractness, there is no absolute definition of what sportiness sounds like. Therefore, ...
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Article
Transfer characteristics of vehicle air conditioners’ booming noise
Vehicle air conditioners generate a booming noise when pressure pulsation in the compressor is generated and transmitted to vehicle interiors through the attached pipes and chassis, which constitute a typical ...
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Article
Soundproofing ability and mechanical properties of polypropylene/exfoliated graphite nanoplatelet/carbon nanotube (PP/xGnP/CNT) composite
Exfoliated graphite nanoplatelets (xGnPs) are platelet-like graphite nanocrystals with multi-graphene layers. They are promising materials for use as nanofillers in polymer composites due to their high conduct...
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Article
A cross-sectional analysis of composite beams based on asymptotic framework
This paper presents the accurate prediction of static behavior of composite beams with arbitrary cross-sections. The asymptotic recursive formulation is reviewed first, where the initial three-dimensional prob...
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Article
Propagation behavior of SH waves in layered piezoelectric plates
In this study, the propagation of SH waves in a coupled plate consisting of a piezoelectric layer and an elastic layer is analytically investigated. The piezoelectric material is polarized in the z-axis direct...
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Article
Local stiffness control for reducing vehicle interior noise by using FRF-based synthesis method
This paper explores the feasibility of estimating the interior noise of a vehicle compartment when the attachment stiffness (i.e., the local stiffness of the mounting point at which operational force is applie...
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Article
Identification of the beat characteristics and dam** ratios of the Hwacheon World Peace Bell using wavelet transform
In this paper, a new measurement technique is proposed to identify the beat characteristics and modal dam** ratios of a Korean bell in the casting field. The beat response caused by the mutual interference o...
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Article
Measurement of the normal acoustic impedance using beamforming method
A beamforming technique is introduced to measure the normal acoustic impedance at both normal and oblique incidence in a free field. In the proposed method, microphone array signals are decomposed into inciden...
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Article
Hybrid experimental/numerical technique for determination of the complex dynamic moduli of elastic porous materials
Polyurethane (PU) and other plastic foams are widely used as passive acoustic absorbers. For optimal design, it is often necessary to know the viscoelastic properties of these materials in the frequency range ...
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Article
Ride comfort evaluation and suspension design using axiomatic design
This study presents a theoretical formulation based on the axiomatic design (AD) approach to suspension systems for improving both ride comfort and static design factors (SDFs) of passenger vehicles. This appr...
