scholarly journals An Investigation into Acoustic Properties of Lightly Needled Estabragh Nonwovens Using the Taguchi Method

2014 ◽  
Vol 9 (3) ◽  
pp. 155892501400900 ◽  
Author(s):  
Sanaz Hassanzadeh ◽  
Mohammad Zarrebini ◽  
Hossein Hasani
Keyword(s):  
Taguchi Method ◽  
Absorption Coefficient ◽  
Areal Density ◽  
Laboratory Scale ◽  
Acoustic Properties ◽  
Effective Parameters ◽  
Nonwoven Fabrics ◽  
Noise Absorption ◽  
Wide Acceptance ◽  
Impedance Tube Method

Sound pollution has become an important issue that has been addressed by scientists of various disciplines. Control of sound in areas of transport and building industries is of paramount importance. Textiles are widely used as sound insulators. Among the broad spectrum of textiles, nonwoven fabrics due to their technical merits and wide acceptance are extensively used as sound controlling media. In this work, various blends of polypropylene and naturally grown hollow Estabragh fibers were used to prepare sound absorptive nonwoven layers. The fiber blends were fed to a laboratory scale carding machine. Carded webs were lightly needled on a laboratory scale needling machine. Acoustic properties of needled samples were evaluated using the Impedance tube method. The Taguchi method was used to analyze the effective parameters influencing fabric acoustic properties. Results show that the proportion of Estabragh fibers in the blends strongly affects the noise absorption coefficient (NAC). Frequency is the second effective factor and is followed by nonwoven layer mass (areal density) and punch density, respectively. It was concluded that layers comprised of 100% Estabragh fibers achieved the highest value of NAC. The results also pointed to existence of a direct correlation between noise absorption coefficient and the amount of punch density exerted during needling process. It was found that the increase in the amount punch density resulted in higher values of NAC.

Automotive Noise Insulation Composite Panel Using Natural Fibres with Different Perforation Areas

2012 ◽  
Vol 165 ◽  
pp. 63-67 ◽  
Author(s):  
Zulkifli R. ◽  
T.K. Thye ◽  
Mohd Faizal Bin Mat Tahir ◽  
Ahmad Rasdan Ismail ◽  
Mohd Jailani Mohd Nor
Keyword(s):  
Absorption Coefficient ◽  
Volume Fraction ◽  
Fibre Volume Fraction ◽  
Fibre Volume ◽  
Acoustic Properties ◽  
Composite Panel ◽  
Impedance Tube ◽  
Coir Fibre ◽  
Noise Absorption ◽  
Kenaf Fibre

This research was carried out to study the acoustic properties of natural organic fibres; kenaf and coir fibres using impedance tube method. Kenaf fibre was used as noise absorber filler in an insulation panel while the coir fibre as reinforcement in the perforated composite panel. The perforated panel was made from coir fibre/polyester composites with coir fibre volume fraction of 10%, 20% and 30%. The perforation area of the perforated panel was also varied at 10%, 20% and 30%. During the processing stage, the kenaf fibre sheet has been treated with PVA and cut into 100 mm and 30 mm diameter sample for low and high frequency test. The density of the coir fibre is determined to be 32.2 g/cm3 while the density of the kenaf fibre is 42.6 g/cm3. The tests were carried out using impedance tube at acoustic lab, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia using ISO 10534-2 standard for noise absorption coefficients to determine their noise absorption coefficient. The results obtained show that the optimum noise absorption coefficient index for kenaf fibre is 0.8 with 10% fibre volume fraction of coir fibre/polyester perforated composites panel at 10% perforation areas.

scholarly journals Fiber Weight Fraction Effect to Acoustic Properties of RHDPE Cantula Composite

2017 ◽  
Vol 16 (2) ◽  
Author(s):  
Muhammad Taufik Burhany Hendrowarsito ◽  
Wijang Wisnu Raharjo ◽  
Dwi Aries Himawanto
Keyword(s):  
Absorption Coefficient ◽  
Sound Absorption ◽  
Density Measurement ◽  
Weight Ratio ◽  
Weight Fraction ◽  
Acoustic Properties ◽  
Sound Absorption Coefficient ◽  
Hot Press ◽  
Coefficient Increase ◽  
Impedance Tube Method

In this study, composites made from recycled HDPE and Cantula fiber have been done and the absorption coefficient have been measured. Composites rHDPE-Cantula were made using hot press for approximately 60 minutes with 170oC temperature while pressure exerted by 50 bar. In this study the weight ratio of Cantula fiber was varied 40%, 50%, 60%, and 70%. Impedance Tube Method was used to measure the sound absorption coefficient in accordance with ASTM E 1050. An increase weight ratio wasn’t influence the sound absorption coefficient significantly, but the optimum sound absorption coefficient shifted to the higher frequencies from 80-200 Hz. An increase weight ratio showed better sound absorption coefficient from 500-1600 Hz, but the result from 60% weight ratio showed low sound absorption coefficient that may caused by it high density leading to the reduction of porosity. This result was supported by density measurement in accordance with ASTM D 792, which the result showed that the sound absorption coefficient increase with decreasing of the density.

Parametric Influence on the Sound Absorption Coefficient of Porous Asphalt

2009 ◽  
Author(s):  
Punnamee Sachakamol ◽  
Liming Dai
Keyword(s):  
Absorption Coefficient ◽  
Sound Absorption ◽  
Prediction Models ◽  
Traffic Noise ◽  
Acoustic Properties ◽  
Sound Absorption Coefficient ◽  
Control Parameters ◽  
Porous Asphalt ◽  
Pavement Materials ◽  
Impedance Tube Method

This research intends to develop a method for predicting the sound absorption coefficient of various porous highway pavement materials. Since many of the existing prediction models for acoustic properties and traffic noise still have limitations and problems with accuracy, sound absorption coefficients are measured with the impedance tube method to verify numerical values obtained from the model. Results obtained from the experiment and numerical simulations are compared and presented to reveal the effect and influence of the control parameters.

scholarly journals Investigation about the Effect of Manufacturing Parameters on the Mechanical Behaviour of Natural Fibre Nonwovens Reinforced Thermoplastic Composites

Materials ◽  
2019 ◽  
Vol 12 (16) ◽  
pp. 2560 ◽  
Author(s):  
Imen Gnaba ◽  
Peng Wang ◽  
Damien Soulat ◽  
Fatma Omrani ◽  
Manuela Ferreira ◽  
...  
Keyword(s):  
Mechanical Behaviour ◽  
Areal Density ◽  
Nonwoven Fabric ◽  
Natural Fibre ◽  
Thermoplastic Composites ◽  
Reinforced Composites ◽  
Nonwoven Fabrics ◽  
Composite Scale ◽  
Needle Punching ◽  
Manufacturing Parameters

To date, nonwoven fabrics made with natural fibres and thermoplastic commingled fibres have been extensively used in the composite industry for a wide variety of applications. This paper presents an innovative study about the effect of the manufacturing parameters on the mechanical behaviour of flax/PP nonwoven reinforced composites. The mechanical properties of nonwoven fabric reinforced composites are related directly to the ones of dry nonwoven reinforcements, which depend strongly on the nonwoven manufacturing parameters, such as the needle-punching and areal densities. Consequently, the influence of these manufacturing parameters will be analysed through the tensile and flexural properties. The results demonstrated that the more areal density the nonwoven fabric has, the more the mechanical behaviour can be tested for composites. By contrast, it has a complex influence on needle-punching density on the load-strain and bending behaviours at the composite scale.

Acoustic Properties of Materials for Vibration Reduction and Resistance on Ultra-Precision Machine

2014 ◽  
Vol 620 ◽  
pp. 140-145
Author(s):  
Dan Huang ◽  
Ying Wang
Keyword(s):  
Absorption Coefficient ◽  
Porous Ceramic ◽  
Vibration Reduction ◽  
Calculation Model ◽  
Acoustic Energy ◽  
Acoustic Properties ◽  
Acoustic Absorption ◽  
Cylindrical Pore ◽  
Acoustic Absorption Coefficient ◽  
Ultra Precision

The porous ceramic holds good potential as acoustic resistance and vibration reduction material during ultra-precision machining. Porous materials absorb acoustic energy by friction with the air that moves inside the pores, and in this paper, the motion is simplified as the incompressible fluid in a single cylindrical pore. The analysis and calculation results show that the acoustic coefficient of porous ceramic is a complicated wave function and the acoustic absorption coefficient calculation model is feasible based on fluid thermal viscous theory. The acoustic absorption coefficient of porous ceramic increases with the increase of thickness, and its period and amplitude decreases with the increase of porosity of ceramic.

scholarly journals The Effects of Various Additive Components on the Sound Absorption Performances of Polyurethane Foams

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Shuming Chen ◽  
Yang Jiang ◽  
Jing Chen ◽  
Dengfeng Wang
Keyword(s):  
Absorption Coefficient ◽  
Sound Absorption ◽  
Transmission Loss ◽  
Polyurethane Foams ◽  
Acoustic Properties ◽  
Acoustic Absorption ◽  
Absorption Properties ◽  
Maximum Enhancement ◽  
Flexible Polyurethane ◽  
Pu Foams

Flexible polyurethane (PU) foams comprising various additive components were synthesized to improve their acoustic performances. The purpose of this study was to investigate the effects of various additive components of the PU foams on the resultant sound absorption, which was characterized by the impedance tube technique to obtain the incident sound absorption coefficient and transmission loss. The maximum enhancement in the acoustic properties of the foams was obtained by adding fluorine-dichloroethane (141b) and triethanolamine. The results showed that the acoustic absorption properties of the PU foams were improved by adding 141b and triethanolamine and depended on the amount of the water, 141b, and triethanolamine.

Evaluation and Optimization of Effective Parameters on Zinc Sulfate Flotation by the Taguchi Method

Silicon ◽  
2016 ◽  
Vol 9 (5) ◽  
pp. 695-701 ◽  
Author(s):  
Nasrollah Najibi Ilkhechi ◽  
Rezvan Yavari ◽  
Shima Barakan
Keyword(s):  
Taguchi Method ◽  
Zinc Sulfate ◽  
Effective Parameters

scholarly journals An Optimization of the New Die Design of Sheet Hydroforming by Taguchi Method

2011 ◽  
Vol 337 ◽  
pp. 294-299
Author(s):  
Morteza Hosseinzadeh ◽  
S. Ali Zamani ◽  
Ali Taheri
Keyword(s):  
Taguchi Method ◽  
Optimal Combination ◽  
Die Design ◽  
Effective Parameters ◽  
Taguchi Optimization ◽  
Sheet Hydroforming ◽  
Confirmation Test ◽  
Die Set ◽  
Hydroforming Process ◽  
Optimization Methodology

During the last few years, several sheet hydroforming processes have been introduced. Despite the advantages of these methods, they have some limitations. Of the processes, the two main ones are the standard hydroforming and hydromechanical deep drawing. A new sheet hydroforming die set was proposed that has the advantages of both processes and eliminates their limitations. In this method, a polyurethane plate was used as a part of the die-set to control the blank holder force. This paper outlines the Taguchi optimization methodology, which is applied to optimize the effective parameters in forming cylindrical cups by the new die set of sheet hydroforming process. The process parameters evaluated in this research are polyurethane hardness, polyurethane thickness, forming pressure path and polyurethane hole diameter. The design of experiments based upon L9 orthogonal arrays by Taguchi was used and analysis of variance (ANOVA) was employed to analyze the effect of these parameters on the forming pressure. The analysis of the results showed that the optimal combination for low forming pressure is harder polyurethane, bigger diameter of polyurethane hole and thinner polyurethane. Finally, the confirmation test was derived based on the optimal combination of parameters and it was shown that the Taguchi method is suitable to examine the optimization process.

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