Experimental study of the waveform shape effect on asphalt mixes fatigue

2009 ◽  
Author(s):  
D Bodin ◽  
D Breysse ◽  
M Merbouh ◽  
L Moriceau ◽  
J Balay
Keyword(s):  
Experimental Study ◽  
Shape Effect ◽  
Asphalt Mixes

scholarly journals Experimental Study of Pipes Shape Effect on Noise Reduction

2017 ◽  
Vol 5 (1) ◽  
pp. 71-86
Author(s):  
Muna S. Kassim ◽  
Ammar Fadhil Hussein Al-Maliki
Keyword(s):  
Experimental Study ◽  
High Pressure ◽  
Noise Reduction ◽  
Power Plants ◽  
Combustion Engine ◽  
Exhaust System ◽  
Noise Pollution ◽  
Shape Effect ◽  
Pipe Length ◽  
Exhaust Noise

Internal combustion engine is a major source of noise pollution. These engines are used for various purposes such as, in power plants, automobiles, locomotives, and in various manufacturing machineries. The noise is caused by two reasons; the first reason is the pulses which created when the burst of high pressure gas suddenly enters the exhaust system, while the second reason is the friction of various parts of the engine where the exhaust noise is the most dominant. The limitation of the noise caused by the exhaust system is accomplished by the use of silencers and mufflers. The aim of this study is the reduction of the noise by changing its inlet and outlet pipe length and shape. Also the losses in noise for different length and shapes have been investigated experimentally. The results show that the corrugated pipe is preferable for noise reduction.

Experimental study to investigate the performance of cold in-place recycling asphalt mixes

2019 ◽  
Vol 172 (6) ◽  
pp. 360-370 ◽  
Author(s):  
Mahmoud Ameri ◽  
Mohammad Hossein Mohammadi ◽  
Seyed Mohsen Motevalizadeh ◽  
Ahmad Mousavi
Keyword(s):  
Experimental Study ◽  
Asphalt Mixes

scholarly journals Experimental Study of Orifice Shape Effect on Noise Reduction of Silencer

2020 ◽  
Vol 7 (2) ◽  
pp. 1-12
Author(s):  
Muna S. Kassim ◽  
Ammar Fadhil Hussein Al-Maliki ◽  
Hayder M. Mohammed
Keyword(s):  
Experimental Study ◽  
Noise Reduction ◽  
Transmission Coefficient ◽  
Internal Combustion Engines ◽  
Noise Pollution ◽  
Shape Effect ◽  
Combustion Engines ◽  
Transmission Losses ◽  
Matlab Program ◽  
Different Shapes

Abstract: Noise pollution is one of the most problems caused by internal combustion engines. In this study, the reduction of noise by changing the orifice shapes and inserting tape is experimentally investigation. The effect of orifice shape on noise reduction of silencer is presented. The calculation of transmission losses and transmission coefficient of noise for different shapes of orifice by using MATLAB program is obtained. In addition, the frequency for maximum and minimum losses is obtained. The results showed that the use of the square orifice and helical tape were better options to reduce the noise in the silencer.

Behavior of Cold Recycled Mixes in the Range of Low Temperatures – Experimental Study

2015 ◽  
Vol 802 ◽  
pp. 303-308
Author(s):  
Ondrej Krpalek ◽  
Jan Valentin
Keyword(s):  
Experimental Study ◽  
Crack Propagation ◽  
Low Temperatures ◽  
Fracture Behavior ◽  
Pavement Rehabilitation ◽  
Asphalt Mixes ◽  
Temperature Range ◽  
Test Behavior ◽  
Water Susceptibility

Cold recycled mixes are used in many parts of the world as a standardized pavement rehabilitation technique. The quality of the mixes has been so far assessed by strength characteristics, water susceptibility and stiffness. In some cases frost resistance is determined as well. Nevertheless, especially for regions with winter seasons where temperatures are reaching values below 0°C, there are no standardized procedures and sufficient findings related to resistance to cracking and fracture behavior. Experimental study done at CTU in Prague describes three types of tests performed on 15 different cold recycled mixes. In parallel three standardized hot asphalt mixes were selected and used as well for a comparison of behavior in the range of low temperatures. Finally specimens acquired from an existing construction site where cold recycled technology was applied have been cored and tested mainly for crack propagation test. In general three tests have been selected and include crack propagation text on semi-cylindrical specimens, flexural strength test and relaxation test. Behavior in low temperature range and resistance to cracking has been tested in the temperature range of 0°C to-10°C.

Evaluation of Asphalt Mixes Containing Reclaimed Asphalt Pavement

2012 ◽  
Vol 178-181 ◽  
pp. 1522-1525 ◽  
Author(s):  
Hussain Arshad ◽  
Yan Jun Qiu
Keyword(s):  
Experimental Study ◽  
Asphalt Pavement ◽  
Asphalt Mixtures ◽  
Structural Performance ◽  
Reclaimed Asphalt Pavement ◽  
Asphalt Mixes ◽  
Reclaimed Asphalt ◽  
Environmental Friendly ◽  
Wide Range ◽  
Pavement Construction

The use of Reclaimed Asphalt Pavement (RAP) has been enormously increased from the last two decades. In fact using RAP in pavement construction has now become common practice in many countries. Using RAP not only economical and environmental friendly but also preserve the natural resources and similar or even better in structural performance than virgin asphalt mixtures. This paper presents an experimental study to evaluate the effect of various types and percentages of RAP on the properties of asphalt mixtures. Four mixtures, which were the combination of two different virgin aggregates and two different RAP sources were studied in this research. The mixtures were designed by Marshall method at a wide range of 0 to 100% RAP blends. RAP material was blended with virgin aggregate such that all specimens tested had approximately the same gradation. Mixtures containing RAP showed significant variability and the variability increased with the increase in RAP content.

Experimental study on the restoration from a tilt-azimuth series for improvement in resolution

1995 ◽  
Vol 53 ◽  
pp. 636-637
Author(s):  
Norio Baba ◽  
Norihiko Ichise ◽  
Syunya Watanabe
Keyword(s):  
Experimental Study ◽  
Spherical Aberration ◽  
Incident Beam ◽  
Optical Parameters ◽  
Beam Tilting ◽  
Illumination Method ◽  
Restoration Method ◽  
Illumination Mode

The tilted beam illumination method is used to improve the resolution comparing with the axial illumination mode. Using this advantage, a restoration method of several tilted beam images covering the full azimuthal range was proposed by Saxton, and experimentally examined. To make this technique more reliable it seems that some practical problems still remain. In this report the restoration was attempted and the problems were considered. In our study, four problems were pointed out for the experiment of the restoration. (1) Accurate beam tilt adjustment to fit the incident beam to the coma-free axis for the symmetrical beam tilting over the full azimuthal range. (2) Accurate measurements of the optical parameters which are necessary to design the restoration filter. Even if the spherical aberration coefficient Cs is known with accuracy and the axial astigmatism is sufficiently compensated, at least the defocus value must be measured. (3) Accurate alignment of the tilt-azimuth series images.

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