sound attenuation Articles
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Ask Yourself These Questions Before You Buy a Granulator
Ask Yourself These Questions Before You Buy a Granulator 1 WHAT DO YOU WANT TO GRIND? * Consider: Type of part or sprue/runner system, type of material (hard/soft, brittle/tough, filled/unfilled), and temperature of parts being granulated. * Determines: Rotor design, horsepower, sound attenuation, and means of regrind removal. 2 WHAT SIZE IS THE PART OR SCRAP? * Consider: Physical size, shape, ...
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Modified log-normal particle size distribution in acoustic spectroscopy
The modified log-normal distribution is a smooth continuous distribution depending on four parameters: median size, standard deviation, minimum size and maximum size. This distribution introduced by Kottler [J. Franklin Inst. 250 (1950) 339] and Irani [J. Phys. Chem. 63 (1959) 1603] gives an opportunity to restrict the particle size range. This distribution is asymmetrical on the logarithmic ...
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Acoustic Spectroscopy for Concentrated Polydisperse Colloids with Low Density Contrast
The mechanisms of sound attenuation are different in dispersions with low and high density contrast. “Viscous losses” are dominant in high density contrast dispersions whereas “thermal losses” predominate in dispersions with low density contrast. The rutile dispersion is chosen as an instance of the high density contrast system. The dispersion of the neoprene latex is an instance of the low ...
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Bulk viscosity and compressibility measurement using acoustic spectroscopy
Bulk viscosity is a somewhat obscure parameter that appears in the hydrodynamic equations for Newtonian liquids when compressibility is important and, together with the dynamic viscosity, controls sound attenuation. Whereas dynamic viscosity reflects only “translational” molecular motion, in contrast the bulk viscosity reflects the relaxation of both “rotational” and “vibrational” degrees of ...
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Oil Mist Collectors: Installation Costs
An oil mist collector not only protects the health of employees, but also makes an addition to your machining equipment. These are inexpensive pieces of equipment and installing the system doesn’t require any high costs. However, there are a few costs that arise after installation, which all companies with this system will face. Equipment Downtime Depending on how the oil mist collector ...
By ProVent, LLC
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Industrial Noise Control Services
Industrial Noise Control Studies Study different equipment noise and recommend suitable noise insulation. This include diesel generators, gas turbines, compressors, pumps, fans, chillers, factory machineries, traffic noise,...etc. Our evaluations and recommended solutions meet general guidelines and practices of international standards and nroise laboratories such as ASTM E477, ASTM E90, ISO ...
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Electrically driven portable pumps
As a manufacturer of mobile pumps, we see electric motors becoming increasingly popular. On construction sites and in temporary pumping installations more attention is paid to stable power supplies. BBA Pumps has completely renewed the platform for electric mobile pumps and is ready for the future. How does it work? Very simply Mobile electric pumps in stackable frames or sound attenuated ...
By BBA Pumps BV
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Sound treatment and structural optimisation for acoustic performance of front dash with sound contribution
Dash of the vehicle poses an important role in attenuating the sound radiated from the engine cabin. The acoustical performance of a vehicle dash system is determined by the sound transmission loss (STL). Computational modelling of such system poses challenge due to the complexity of the material properties as well as geometry. In the analysis, a numerical method with structure–sound interaction ...
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Acoustic Spectroscopy for Concentrated Polydisperse Colloids with High Density Contrast
The acoustic attenuation spectra for rutile dispersions show a pronounced nonlinear increase in attenuation over a volume fraction range from 1% to 42%. A theory is developed to explain this nonlinear effect. This theory takes into account hydrodynamic particle−particle interactions caused by a sound wave. The modification of the acoustic theory has been accomplished using a “cell model” and a ...
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Acoustic and Electroacoustic Spectroscopy of Water-in-Diluted-Bitumen Emulsions
Water-in-oil emulsions of Athabasca bitumen diluted with toluene have been studied using the latest advances in acoustic and electroacoustic spectroscopy. From the sound attenuation spectra of emulsions, the water droplet size distribution is measured. The electrical surface charge density of the water droplets is obtained from the colloid vibration current. In the case of freshly prepared ...
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Ultrasonic Sensors: Range Vs Frequency
Ultrasonic sensors are pretty cool. Transducers send and receive waves, measurements magically get spit out by the sensor, and nothing had to touch anything, right? You can choose sensors based on range, or type of transducer, or even safety ratings. Most sensors declare their range and frequency together, which seems kind of odd. Why is the range of an ultrasonic sensor tied to its frequency? ...
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Characterization of Concentrated Dispersions with Several Dispersed Phases by Means of Acoustic Spectroscopy
Acoustic attenuation spectroscopy can characterize the particle size distribution (PSD) of mixed concentrated dispersions, i.e., systems having more than one dispersed phase. In this paper, we will suggest two models that can be particularly helpful for describing such mixed dispersions. The first “multiphase” model assumes that we can represent the PSD of a real-world dispersion as a sum of ...
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Two Technologies for Flow Measurement from Outside a Pipe
Doppler and Transit Time are two very popular types of flow meter for non-invasive measurement of flow in full pipes. We tend to confuse these technologies because they are both ultrasonic and both measure flow by using sensors clamped onto the outside of a pipe. In the real world they actually work best in opposite applications. Success in your installation depends on understanding the ...
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Case study - Paint spray
Problem A major automotive component supplier needed to control the emissions from its paint spray process. The plant emissions had characteristics common to many paint spray plants: high air flow, low volatile organic compound (VOC) concentration and particulate. The company needed an emission control solution that had low operating costs and that could also fit in their limited space. System ...
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The Usefulness of Non-Woven Fabrics Today and Its Future
Nearly every place you sit or stand has a nonwoven fabric. It could be a coffee filter, a tea bag, a mask, diapers, tissues for contact lenses, or other such items. This fabric now has more significance because of the current circumstances and the times we went through because of Covid, yet its market has expanded through time. What is Non-Woven? The most traditional and basic types of textiles ...
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Case study - Paint booth over spray
OVERVIEW A major automotive component supplier needed to control the emissions from its paint spray process. The plant emissions had characteristics common to many paint spray plants: high air flow, low volatile organic compound (VOC) concentration and particulate. The company needed an emission control solution that had low operating costs and that could also fit in their limited space. System ...
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How the LISST-ABS works
INTRODUCTION: Sequoia’s Acoustic Backscatter Sensor, LISST-ABS is designed to measure suspended sediment concentration at a point. Unlike ADCP’s which may record similar backscatter strength at multiple points along the acoustic beams (‘ranges’), the LISST-ABS only reports backscatter signal strength at a single point about 5 cm from the transducer. The instrument ...
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Making improvements to noise control in production plants
Jochen Schaal, managing director of SoundPLAN GmbH and Michel Rosmolen, director of SoundPLAN Asia, outline opportunities for the sector to soundly improve our environment Manufacturing is one of the high growth sectors in India. The India Brand Equity Foundation (IBEF) reports that the country’s ranking, in terms of most sought after manufacturing destination in the world, has climbed to ...
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‘Kyoto cost’ of various production and recycling processes
‘Kyoto cost' of various production and recycling processes: An interesting take on the the total CO2 emissions released during the lifetime of various containers used in the manufacturing and delivery of bottled water and other fluid products typically consumed in North America and Europe. Despite a change in government and a Conservative pre-election pledge to opt out of the Kyoto ...
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Smart environmental solutions for a changing chemical landscape
Jochen Schaal, managing director of SoundPLAN GmbH and Michel Rosmolen, director of SoundPLAN Asia outline opportunities for the sector to soundly improve our environment Like many sectors, the chemical industry within India and globally, is adapting to a number of challenges. The COVID-19 pandemic, and resulting shortages in materials and economic turbulence, has hit industries hard. There is ...
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