The friction noise and tribological properties including vibration acceleration level, volume wear rate and coefficient of friction (COF) were investigated on MRH-3A tribological test machine. Compared with typical rubber bearing materials, the PTFE-based composites performed remarkable noise-reduction ...
独特的开孔三维结构能有效地阻挡声波,消音系数NRC=0.95,超过大多数传统材料。 The unique three-dimensional structure of the opening can effectively block the sound wave, and the noise reduction coefficient NRC=0.95, which exceeds most traditional materials. High-decibel noise in industrial and manufacturing...
coefficient can reach 95.5%.The noise reduction coefficients(NRC) of the composite materials are also obviously superior to those of single materials.The NRC of the three layers sample(36mm thick) of plywood-sponge composite and the NRC of the four layers sample(46mm thick) of plywood-foam ...
Related to Noise Reduction Coefficient:Sound transmission class,sound absorption coefficient NRC abbr. 1.National Research Council 2.Nuclear Regulatory Commission American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Publish...
The imminent threat of noise pollution requires the development of efficient acoustic materials. Aerogels have been considered as a promising noise reduction materials due to their special porous structure, lightweight and acoustic delay characteristics. Currently, a variety of aerogels are investigated on...
4,any required core materials could be replaced. Back Soundtex acoustic felt attached on the back of the panels. Noise Reduction Coefficient 0.7 Fireproof grade GB8624 2012 A / B1 Eco-protection grade E0 / E1 Installation aluminum keel and clips, wood frame, gun nail Certificatio...
The effects of titanium dioxide (TiO2) filler with 1–3 wt% ratios on the properties of EF and RF were determined. The average porosity, foam morphology, acoustic property such as sound absorption coefficient, α and noise reduction coefficient (NRC) of the polymer foams after exposure to UV...
Accordingly, the breakup and dissipation of the local flow structure lead to noise reduction. As shown in Fig. 6a, noise reduction can be found also in the case SL-L, but the decrement is not pronounced. In this case, the flow behind the step is simply damped, because of the increased...
First, although there are more total mol- ecules in more the complex networks, each species is kept at comparable levels, and secondly, networks of equal total counts exhibit different noise reduction depending on their structure. Overall, the networks of biological origin exhibit better behavior ...
Calcium Silicate Board is mainly made from siliceous materials ,lime refractory and reinforcing fiber through the process of slurrying,forming,high pressure steam curing, drying,surfacing ect. When siliceous material and lime refractory is mixed together ...