Investigation of vibro-acoustic characteristics. Design and development of means for reducing the noise of the IM-252 needle-punching machine

1990 ◽  
Vol 22 (6) ◽  
pp. 430-433
Author(s):  
N. L. Sukhanov ◽  
A. B. Druzhilovskii ◽  
V. �. Strumitskii ◽  
A. Ya. Chistyakov
Keyword(s):  
Design And Development ◽  
Acoustic Characteristics ◽  
Needle Punching ◽  
Needle Punching Machine

Effect of Time and Temperature when Removing PVA from a PET/PVA Nonwoven Material

2013 ◽  
Vol 821-822 ◽  
pp. 188-194
Author(s):  
Sizo Ncube ◽  
Chu Yang Zhang ◽  
Edison Omollo ◽  
Li Liu
Keyword(s):  
High Temperature ◽  
Polyvinyl Alcohol ◽  
Pore Size ◽  
Water Solubility ◽  
Nonwoven Material ◽  
Water Bath ◽  
Heating Period ◽  
Needle Punching ◽  
Needle Punching Machine

The study examined the effect of heat and time on fabrics made from polyester (PET) and polyvinyl alcohol (PVA) fibres which have different aerial densities and composed of 90% and 10% of PET and PVA respectively. PVA is included in the fabric due to its water solubility and this will allow the PVA to be removed thereby leaving a more porous fabric. The fabrics were passed through needle punching machine and PVA removed by heating in a water bath. The nonwoven fibre was then heated in water at temperatures of 75, 85 and 100 °C in an effort to remove the PVA fibres and leave a more porous fabric. While removing the PVA through heating in a water bath, the effect of heating period and the temperature on the fabric properties was investigated. The strength, elongation and structure of the fabric were investigated and the changes analysed. It was found that there was a significant removal of PVA at longer periods of time when at a high temperature. The effect on the properties was found to be higher with higher temperatures as well with a decrease in strength ranging between 40% and 60% being experienced while an increase in elongation, between 60% and 90% was experienced. Fibre spacing and pore size was found to have increased as well.

scholarly journals Development of Needle-Punched Nonwoven Fabrics from Natural Fibers for Sound Absorption Behavior

2021 ◽  
Author(s):  
K Savitha ◽  
Grace S Annapoorani ◽  
V R Sampath
Keyword(s):  
Thermal Conductivity ◽  
Sound Absorption ◽  
Fiber Strength ◽  
Natural Fibers ◽  
Areal Density ◽  
Fiber Layer ◽  
Nonwoven Fabrics ◽  
Sesbania Grandiflora ◽  
Needle Punching ◽  
Needle Punching Machine

: The natural fibers prepared from plant waste have parameters like fiber strength, length, and chemical composition which are suitable to fabric and the fibers into nonwoven. The selected plants were identified from their botanical names by comparing the collected samples with those of known identity in the herbarium of a botanical survey in India with their names as Sesbania grandiflora, Mutingia Calabura, and Bauhinia Purpurea. A novel Portable multi-fibre decorticator machine was fabricated and used to extract the fibers from the plant stem and barks. The extracted fibers are done physical characterization and their properties are investigated. The extracted fibers are blended with other natural fibers like jute and flax in appropriate proportions 45:45:10 and nonwoven fabrics were prepared by the needle-punching method. Three and four-layer nonwovens are produced using a needle punching machine. The developed nonwovens are tested using standard apparatus and the effect of natural fibers in areal density, thickness; bulk density, porosity, and air permeability are analyzed. In addition, thermal conductivity and sound absorption behaviour are also investigated. The sound absorption property increases concerning areal density and fabric thickness. The thermal conductivity increased by increasing the fiber layer in the fabric to evaluate its potential as a protective barrier material in non-woven face masks.

scholarly journals Mechanic of the Needle Punching Machine and Quality of the Punched Fabric

1970 ◽  
Vol 23 (4) ◽  
pp. P291-P300
Author(s):  
Y. Miura ◽  
M. Kitade
Keyword(s):  
Needle Punching ◽  
Needle Punching Machine

scholarly journals Needle Punching Machine

1970 ◽  
Vol 23 (4) ◽  
pp. P301-P309
Author(s):  
Y. Hattori
Keyword(s):  
Needle Punching ◽  
Needle Punching Machine

Modal Experiment and Analysis of Needle-Punching Machine

2012 ◽  
Vol 605-607 ◽  
pp. 1257-1260
Author(s):  
Zi Long Tang ◽  
Jian Chang Yuan
Keyword(s):  
Modal Analysis ◽  
Production Efficiency ◽  
Natural Frequencies ◽  
Dynamic Performance ◽  
System Structure ◽  
Main Method ◽  
Machine Performance ◽  
Needle Punching ◽  
Work Of Deformation ◽  
Needle Punching Machine

Modal analysis is a main method of researching the dynamic performance of the system structure. The deformation of Needle-punching machine frames in the work will affect the whole machine performance, which would seriously influence acupuncture frequency, reduce production efficiency. At the meantime, machine life will be shortened. Here, Needle-punching machine modal experiment has been done, the static natural frequencies and modal deformation animation of frame also has been calculated, that provides a reliable guide and basis for the actual work of deformation for needle-punching machine.

Vibration Analysis of Needle-Punching Machine Slider-Crank Mechanism

2012 ◽  
Vol 215-216 ◽  
pp. 730-734
Author(s):  
Jun Hui Xie ◽  
Jian Chang Yuan
Keyword(s):  
Vibration Analysis ◽  
Simulation Software ◽  
Connecting Rod ◽  
Substitution Method ◽  
Matlab Software ◽  
Needle Punching ◽  
Movement Characteristics ◽  
Adams Simulation ◽  
Needle Punching Machine ◽  
Crank Mechanism

After analysis of the movement characteristics of needle-punching machine slider-crank mechanism in theory, a slider-crank mechanism acceleration curve had been rendered by MATLAB software and acceleration movement curve had been drawn after the measurement of acceleration of slider-crank mechanism by ADAMS simulation software. Through the comparison between the two results, a conclusion had been drawn. Finally, 3 advice of minishing vibration had been given according to the conclusion of calculation of acceleration by Quality Substitution Method,the first advice is the quality and site of the balance block are chose appropriately,the second advice is the weight of the slider and the connecting rod need to be reduced by choosing appropriate material.

Prosodic Impairment Associated With Traumatic Brain Injury

2009 ◽  
Vol 19 (3) ◽  
pp. 97-102
Author(s):  
Billy Irwin
Keyword(s):  
Traumatic Brain Injury ◽  
Brain Injury ◽  
Detailed Analysis ◽  
Acoustic Characteristics ◽  
Individual Variations

Abstract Purpose: This article discusses impaired prosody production subsequent to traumatic brain injury (TBI). Prosody may affect naturalness and intelligibility of speech significantly, often for the long term, and TBI may result in a variety of impairments. Method: Intonation, rate, and stress production are discussed in terms of the perceptual, physiological, and acoustic characteristics associated with TBI. Results and Conclusions: All aspects of prosodic production are susceptible to the effects of damage resulting from TBI. There are commonly associated prosodic impairments; however, individual variations in specific aspects of prosody require detailed analysis.

Age-Related Decline in Emotional Prosody Discrimination

2014 ◽  
Vol 61 (3) ◽  
pp. 215-223 ◽  
Author(s):  
Rachel L. C. Mitchell ◽  
Rachel A. Kingston
Keyword(s):  
Older Adults ◽  
Auditory Perception ◽  
Duration Discrimination ◽  
Pitch Perception ◽  
Sensory Level ◽  
Emotional Prosody ◽  
Processing Stage ◽  
Acoustic Characteristics ◽  
Age Related ◽  
Level Of Processing

It is now accepted that older adults have difficulty recognizing prosodic emotion cues, but it is not clear at what processing stage this ability breaks down. We manipulated the acoustic characteristics of tones in pitch, amplitude, and duration discrimination tasks to assess whether impaired basic auditory perception coexisted with our previously demonstrated age-related prosodic emotion perception impairment. It was found that pitch perception was particularly impaired in older adults, and that it displayed the strongest correlation with prosodic emotion discrimination. We conclude that an important cause of age-related impairment in prosodic emotion comprehension exists at the fundamental sensory level of processing.

A case study on use of personas in design and development of an audit management system

2007 ◽  
Author(s):  
Pallavi Dharwada ◽  
Joel S. Greenstein ◽  
Anand K. Gramopadhye ◽  
Steve J. Davis
Keyword(s):  
Management System ◽  
Design And Development ◽  
Audit Management
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