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Article
Sound absorption effects in a rectangular enclosure with the foamed aluminum sheet absorber
For the purpose of finding out the optimal thickness of sound absorber and the sound absorption effects due to the selected thickness at an interested frequency range, the analytical study identifies the inter...
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Article
Noise reduction of muffler by optimal design
This paper proposes an optimal design scheme to improve the muffler’s capacity of noise reduction of the exhaust system by combining the Taguchi method and a fractional factorial design. As a measuring tool fo...
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Article
Preparation of 30×30 mm2 Free-Standing GaN Wafer by Mechanical Liftoff and Optical Properties in The Backside of The Free GaN by Cathodoluminescence
In this study, free-standing GaN was produced from 350- to 400-μm-thick GaN films grown on sapphire by using hydride vapor phase epitaxy. The thick films were separated from the substrate by using the mechanic...
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Article
Development of a low-cost steering system simulator
The Steering system is the most important system for a vehicle, in terms of safety and driving feel. But in many cases, experiments to improve the steering feel using a real vehicle are very difficult in the a...
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Article
Tribochemical interactions of Si-doped DLC film against steel in sliding contact
This study concerns the effects of tribochemical interactions at the interface of Si-DLC (silicon-doped diamond-like carbon) film and steel ball in sliding contact on tribological properties of the film. The S...
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Article
Multi-dimensional spectral analysis of the noise contribution from a drum washer with a dehydrating condition
Recently, there has been a growing consumer interest in the amount of noise produced by household electrical appliances. The designer of the product must determine the source of the noise, in order to eliminat...
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Article
Design of the intake system for reducing the noise in the automobile using support vector regression
This paper proposes an optimal design scheme to reduce the noise of the intake system by using support vector regression techniques. For this, as a measuring tool for the performance of the intake system, the ...
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Article
Application of non-stationary signal characteristics using wavelet packet transformation
Although Fourier-based methods have been standard methods for frequency analysis, they are not well suited for the analysis of nonlinear or non-stationary systems due to their time-varying natures. Thus, in th...
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Article
Analysis of the HVAC system’s sound quality using the design of experiments
Human hearing is very sensitive to sound, so a subjective index of sound quality is required. Each situation of sound evaluation is composed of Sound Quality (SQ) metrics. When substituting the level of one fr...
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Article
An inverse algorithm of nonlinear load-displacement for a slotted disc spring geometric design
A geometric design algorithm for a slotted disc spring is proposed in this study. By using the proposed algorithm, all geometric dimensions of a slotted disc spring can be parameterized to satisfy a target non...
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Article
Magnetic-field-dependent shear modulus of a magnetorheological elastomer based on natural rubber
A magnetorheological elastomer (MRE) is a smart material that has a reversible and variable modulus in a magnetic field. Natural rubber, which has better physical properties than silicone matrices, was used as...
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Article
Temperature- and Al/N ratio-dependent AlN seed layer formation on (110) Si substrates by using plasma-assisted molecular beam epitaxy
AlN seed layers with a thickness of 50 nm were grown by using nitrogen plasma-assisted molecular beam epitaxy on (110) Si substrates with different V/III ratios in the temperature range from 850 °C to 940 °C. ...
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Article
The prediction of dynamic fatigue life of multi-axial loaded system
The purpose of this paper is to compare with estimation of equivalent fatigue load in time domain and frequency domain and estimate the fatigue life of structure with multi-axial vibration loading. The fatigue...
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Article
Influence of an embedded low-temperature AlN strain relaxation layer on the strain states and the buffer characteristics of GaN films grown on (110) Si substrates by using ammonia molecular beam epitaxy
The effect of a low-temperature AlN strain relaxation layer on the strain state and the leakage characteristics of GaN buffer layers grown on (110) Si substrates by using ammonia molecular beam epitaxy has bee...
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Article
Optimization and performance improvement of an electromagnetic-type energy harvester with consideration of human walking vibration
In this study, we derived an equation of motion for an electromechanical system in view of the components and working mechanism of an electromagnetic-type energy harvester (ETEH). An electromechanical transduc...
