scholarly journals Effect of different types of waste materials used between double glazing box to isolate fatigue test machine noise

2021 ◽  
Vol 41 (1) ◽  
Author(s):  
Samheri A. Almuradi
Keyword(s):  
Fatigue Test ◽  
Noise Removal ◽  
Sound Level ◽  
Sound Attenuation ◽  
Three Dimensions ◽  
Waste Materials ◽  
Sound Insulation ◽  
Test Machine ◽  
Sound Sources ◽  
Materials Used

This study examines air, recycled plastic grains, fibers from rubber shreds and sawdust fibers as sound insulation materials to attenuate sound produced from continuous working lab fatigue test machine. These waste materials are filled in between a double glazed-aluminum framed box. The sound attenuation is tested at three studied 0.5, 1.0 and 1.5 m distances. Since the sound wave is propagated in three dimensions, the experimental work is employed in four upper, fronts, motor and sample fixture side directions. Moreover, the study is extended to examine temperature increase due to enclosing. Tests of sound level are carried out with closed and opened inlet and outlet designed slotting according to a box size. Gradual sound attenuation reaches 18, 20, 22 and 25% for air, plastic grains, rubber and sawdust fibers, respectively. The present work proves that waste materials are efficient in noise removal from sound sources. Also, they help the environment cleanliness from synthetic disposable bottles and tires as well as bio-wood wastes and assist the sustainability of earth.

Sound attenuation and audibility of fire alarm signal in Korean residential apartment buildings: A case study

2017 ◽  
Vol 27 (5) ◽  
pp. 690-705
Author(s):  
Min-Joo Lee ◽  
Myung-Jun Kim
Keyword(s):  
Residential Buildings ◽  
Field Measurements ◽  
Sound Level ◽  
Sound Attenuation ◽  
Sound Insulation ◽  
Sound Sources ◽  
Fire Alarm ◽  
Apartment Buildings ◽  
Closed Door ◽  
Insulation Performance

With a view to preventing casualties due to fire outbreaks in residential buildings, we investigated the sound attenuation of audible fire-alarm signals in Korean residential apartment buildings and determine an acoustic condition for enhancing the audibility of such signals. Two sets of field measurements were performed, along with theoretical predictions using sound analysis software. In the first set of measurements, in 17 dwelling units, the standardized alarm sound level requirement of 75 dBA could not be achieved in bedrooms with existing alarm devices. In the second set of measurements, with an additional five dwelling units, both the sound attenuation according to the distance between sound sources and bedrooms and the sound insulation performance of bedroom doors were examined. The sound attenuation levels were increased by 0.72 ( R2 = 0.7982) and 0.48 ( R2 = 0.3001) dB m−1 under open- and closed-door conditions, respectively. Further, the bedroom-door sound insulation performance was in the 18- to 23-dB range. Consequently, we have demonstrated that the sound power of a general residential fire alarm must be 98–107.9 dB, depending on the dwelling-unit size and floor-plan type, in order to achieve a bedroom audibility level of 75 dBA.

A FAST ROTATING BENDING FATIGUE TEST MACHINE

2017 ◽  
Author(s):  
Marco Antonio Meggiolaro ◽  
Jaime T P Castro ◽  
Rodrigo de Moura Nogueira
Keyword(s):  
Fatigue Test ◽  
Test Machine ◽  
Bending Fatigue ◽  
Bending Fatigue Test ◽  
Rotating Bending Fatigue ◽  
Rotating Bending ◽  
Fast Rotating

Effect of ceiling and dry-type double floor on heavy-weight floor impact sound in concrete building and CLT building.

2021 ◽  
Vol 263 (3) ◽  
pp. 3064-3072
Author(s):  
Takashi Yamauchi ◽  
Atsuo Hiramitsu ◽  
Susumu Hirakawa
Keyword(s):  
Frequency Band ◽  
Sound Level ◽  
Center Frequency ◽  
Sound Insulation ◽  
Octave Band ◽  
Band Center ◽  
Heavy Weight ◽  
Concrete Building ◽  
Floor Structure ◽  
Insulation Performance

The air layer between the interior finishes and the structure is used as piping and wiring space. In many cases, ceilings and dry-type double floors are commonly constructed in Japan. However, the effect of the air layer of ceilings and dry-type double floors on the heavy-weight floor impact sound insulation performance has not yet quantitatively investigated. Therefore, in this study, the same floor and ceiling structures were constructed for concrete and CLT buildings, and the heavy-weight floor impact sound was investigated. As results, it was confirmed that the reduction amount of the heavy-weight floor impact sound by the ceiling tended to be smaller in CLT buildings than in concrete buildings. However, the trends were similar. Due to the dry-type double floor structure, the heavy-weight floor impact sound level was increased in concrete building and decreased in CLT building at 63 Hz in the octave band center frequency band. Therefore, it can be said that the dry-type double floor structure can be used to improve the heavy-weight floor impact sound performance in the CLT building.

Use of a simple in vitro fatigue test to assess materials used in the surgical treatment of stress urinary incontinence and pelvic organ prolapse

2018 ◽  
Vol 38 (1) ◽  
pp. 107-115 ◽  
Author(s):  
Sabiniano Roman ◽  
Naside Mangir ◽  
Lucie Hympanova ◽  
Christopher R. Chapple ◽  
Jan Deprest ◽  
...  
Keyword(s):  
Urinary Incontinence ◽  
Surgical Treatment ◽  
Pelvic Organ Prolapse ◽  
Stress Urinary Incontinence ◽  
Fatigue Test ◽  
Pelvic Organ ◽  
Materials Used

scholarly journals Impacts of vehicle tire on slip resistance and sound pollution in asphalt pavements

2021 ◽  
Vol 2 (3) ◽  
pp. 16-21
Author(s):  
Saeed Abbassi
Keyword(s):  
Urban Areas ◽  
Noise Pollution ◽  
Sound Level ◽  
Asphalt Pavements ◽  
Fine Grained ◽  
Sensitive Areas ◽  
Slip Resistance ◽  
Materials Used ◽  
The Cost ◽  
Pavement Friction

Noise pollution caused by vehicle traffic is one of the major problems in urban areas with road expansion. Due to the increase in the cost of construction and installation of sound walls to deal with noise pollution, to deal with this problem should look for methods that do not have additional costs and operating costs. Improving the pavement texture is one of the most effective ways to reduce tire noise and pavement and reduce the asphalt surface’s sound. To evaluate the slip resistance of asphalt, the English pendulum test according to ASTM E303-74 standard was performed on wet parts of asphalt in wet conditions. This device is used to examine the fine texture of the pavement. The number of pavement friction with a negative coefficient of 0.1469 has an inverse ratio with the intensity of sound level increases the number of pavement friction aligned with the amount of sound level created decreases. On the other hand, the depth of pavement texture, which is determined as the size of pavement materials, with a coefficient of 0.2810, has a direct ratio with the amount of noise pollution, and the smaller the number of fine-grained materials used will increase the sound level. According to the results of the coefficients estimated from the equation, it can be concluded that the preparation of pavements with an amount of friction can reduce the amount of noise pollution emitted by the movement of vehicles, especially in urban areas and sensitive areas. Therefore, it is recommended that in acoustically sensitive areas, in preparing pavements, arrangements be made to use coarser materials and maintain proper pavement resistance. For this purpose, in this article, the pavement’s texture is examined in the amount of noise created due to the tire’s interaction and the pavement.

scholarly journals Utilization of Waste Materials in Soil Stabilization

2019 ◽  
Vol 9 (2) ◽  
pp. 4459-4463 ◽  
Keyword(s):  
Soil Stabilization ◽  
Soil Strength ◽  
Vital Role ◽  
Waste Materials ◽  
Sieve Analysis ◽  
Ratio Test ◽  
Index Test ◽  
Coir Fiber ◽  
Unconfined Compression Test ◽  
Materials Used

Soil strength plays a vital role in the construction field. The main purpose of this project is to stabilize red soil with the help of various waste materials. The waste materials used are rice husk ash, lime, ground granulated blast furnace slag and coconut coir fiber. These waste materials have been mixed with the soil in the ratio 10%, 20% and 30% and subjected to various tests Specific Gravity Test, Sieve Analysis Test, Plasticity Index Test, Standard Proctor Test, Unconfined Compression test and California Bearing ratio test. A comparative increase in soil strength was found with all the waste materials. Thus, ultimately the soil is stabilized with the help of these waste materials.

Managing the risk from children’s travel cups

2021 ◽  
pp. emermed-2020-210294
Author(s):  
Alice Cameron ◽  
Serryth Dominic Colbert ◽  
Alisdair Macleod ◽  
Harinderjit S Gill
Keyword(s):  
Three Dimensional ◽  
Dental Trauma ◽  
Global Market ◽  
Test Machine ◽  
Body Parts ◽  
Suction Force ◽  
Pullout Force ◽  
Emergency Tracheostomy ◽  
Potential Risks ◽  
Materials Used

IntroductionUK national newspapers have reported cases of children (and adults) who have got their tongue trapped in a Disney travel mug lid, causing extreme distress to the patients, their parents and ED staff. Potential risks include oral endotracheal intubation necessitating emergency tracheostomy to secure the airway, tongue necrosis and dental trauma. Although Disney has withdrawn their original mug from the global market, the same dangers can occur with other internationally available brands. Our aim was to design, test and present an alternative lid.Methods and materialsWe designed an alternative lid to fit onto the original Disney mug; our addition of two parallel bars prevented tongue protrusion into the lid. Prototypes of the original and new lids were three-dimensional printed for testing. A tongue substitute was developed and a representative 0.2 bar suction force was generated. The bottle was mounted in a material test machine, attached to the load cell fixture. Four samples each for the existing and new design were tested. The data were analysed by a custom Matlab script to extract the maximum force required to remove the tongues from the cup.ResultsThe new design resulted in a significant (p=0.0286, Mann-Whitney U) reduction in pullout force. For the existing design, the median pullout force was 4.64 N (minimum 3.86 N, maximum 4.91 N), while it was 2.37 N (minimum 2.20 N, maximum 2.53 N) for the new design. Trauma to the materials used with the original lid design was evident but not observed with our design.ConclusionOur lid appears to offer a safer design that can avoid injuries. However, absolute safety remains unproved, as testing did not account for other body parts which may get trapped in the lid, nor did we test a range of tongue substitute sizes, and laboratory testing only was completed.

The Influence of the Deformation Degree on the Mechanical Properties and Microstructures of the Blanks Obtained by Tube and Wire Drawing

2017 ◽  
Vol 1143 ◽  
pp. 85-90 ◽  
Author(s):  
Octavian Potecaşu ◽  
Florentina Potecaşu ◽  
Mihaela Marin ◽  
Florin Bogdan Marin ◽  
Florica Chicoş
Keyword(s):  
Mechanical Properties ◽  
Wire Drawing ◽  
Strength Properties ◽  
Three Dimensions ◽  
Deformation Degree ◽  
Metallic Material ◽  
Materials Used ◽  
Strength And Plasticity ◽  
Hot Rolled ◽  
Rolled Wire

In this paper is describe the influence of the deformation degree on the mechanical properties and microstrucure of the blanks obtained by tube and wire drawing. The materials used for this study are represented by two different samples: hot rolled wire rod and wire for concrete reinforcement with periodic profile (drawn wire) with three dimensions of obtained diameter ( d1 = 5.00 mm, d2= 4 mm and d3= 3,5 mm). The results reveal that the strength properties of the samples are increasing with an increase in the degree of deformation, while the plasticity properties are lowering.The purpose of this paper is to evidence the changes in the structure, the strength and plasticity properties depending on the deformation degree and section reducing of the metallic material.

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