Search results

Introduction Oil drilling platform can generate noise up to 100dB, seriously affected the health of people's lives.
Setting the parameters of sound-absorbing cotton material as follows, density is 10kg/m3, the structure factor is 2, impedance is 40000rayl / m, porosity is 90%.
Table 1 shows the material properties of each component.
The properties of acoustic panels and shutters material name Thickness (mm) Density (kg/m3) Damping factor Poisson's ratio Modulus (×1010N/m2) steel 1.5 7900 0.001 0.3 21 Damping rubber sheet 25 1200 0.25 0.4 0.16 Composite rock 45 500 0.4 0.1 0.07 According to on-site field measurements, we set a plane wave sound source 2m away from the noise components, set calculated points 1m away from both sides of the board for measuring the transmission loss of sound insulation.Figure2 shows the amount of noise reduction.
The rear of the body and the connecting drive shaft are switch to switch sound glass door, which reduces the gap and does not affect the normal maintenance.

The gel properties of collagen solution determines its superior adhesivity.
The modification method can improve greatly the anti-bending, water resistance and other comprehensive physical and chemical properties of collagen membrane[2,3].
On the physico-chemical and dielectric properties of glutaraldehyde crosslinked galactomannan-collagen films: Carbohydrate Polymers.
Effect of the particle size in dispersions on the properties of waterborne polyurethane/casein composites: Ind.
Structure and properties of polyacrylate resin-b-poly (glycidyl methacrylate) self-crosslinking copolymer: Fine Chemicals.

First, use Taguchi orthogonal array experimental factors with orthogonal properties for ultrasonic-assisted turning of the L9 orthogonal array, and apply the orthogonal array experimental data as initial ANN training examples.
Control factor level ofTaguchi method.Table 1 shows the four control factors and three levels.
Among the factors affecting surface roughness quality, rotational speed was the most significant, followed by feed rate.
Among the factors affecting surface roughness quality, rotational speed was the most significant.
Among the factors affecting surface roughness, rotational speed was most significant, followed by turning feed rate.

(1) The stress and deformation analysis of deep and large foundation pit need to study the unload problems and soil stress, strength and deformation properties induced by excavation [7].
There are too many factors that influence soil pressure, such as the properties of soil, the depth of excavation, supporting types and water, etc.
What’s more, each of these factors has different influence degree to earth pressure.
In a word, the above factors induce that earth pressure distribution is different.
The physical and mechanics parameters of rock and soil have close relation with the sampling method, test method, boundary conditions and other factors.

An actual problem is the synthesis of ceramic composite materials based on refractory compounds to produce nanostructured materials with high mechanical strength, namely, flexural strength, fracture toughness, hardness, heat resistance and thermal strength.
Particles of the powder (P1) substantially monodisperse associated in loose aggregates with a low bond strength between the particles and the particles have topology a with not spheroidized character (Fig. 1a), which may indicate the anisotropy properties of the resulting material.
Also, a significant decrease in density of these samples may affect a small particle size starting powder - 19nm, compared with the granular powder particle size P2 at which the starting powder size is 90nm.
These factors lead to low efficiency of pressing ultrafine powders.
Conclusions  - A set of experimental observations suggest that the behavior of the polycrystalline body is determined by sintering not only the properties of individual particles as aggregates properties and strength of bonds between particles of the powder has a significant effect on the sintering process and the final properties of the ceramic;  - Implemented by electroconsolidation getting bulk samples submicron ceramic compositions ZrO2 - n wt.% Al2O3 (n = 10, 20, 30) with a density of up to 99% of the theoretical and the scale of the microstructure of the order of 270nm.

The factors that affected H-Beam deformation were fairly more, so, the accurate analysis answer was hardly to get.
By using all-purpose method to roll H-Beam, the distribution of H-Beam surface and inside temperature field became very complex due to some factors influence, such as transfer heat of rolling piece and roller contact, water cooling, heat radiation and plasticity merit heat.
The node 7 and 9 were located on the surface of model, so, factors that affected temperature drop were very more, such as thermal convection of its around gas, radiation, heat conductance between rollers and mechanical merit heat.
The influence of many factors made the temperature change of node crowd go up to a certain extent.
(2)Calculation result showed: temperature of every node presented the tendency of drop since it got the role of factors such as heat conductance, convection and radiation, but it had the phenomenon of rising at a certain time under the influence of mechanical merit heat

Effect of the related factors such as water proportion, mineral admixtures and chemical activators on characteristics of Hemi-hydrate FGD gypsum-fly ash complex cementing material is studied through a number of single factor experiments.
So study of effect law of calcining temperature on properties of FGD gypsum is very important.
Fig.1 Effect of calcination temperature on properties of FGD gypsum Experimental Results and Analysis Determination of Basic Mix Proportion.
Water-aggregate proportion here refers to ratio of water to all the other raw materials, namely water: (HFGD gypsum + fly ash + cement + lime + chemical activator), which directly affects the strength, density of the cementing material and both the sound insulation and thermal insulation properties etc.
Table 2 Effect of Water-aggregate Proportion on properties of cementing material No.

Benguediab et al. [43] have analyzed the Chirality and scale effects on mechanical buckling properties of zigzag double-walled carbon nanotubes.
Semmah, Chirality and scale effects on mechanical buckling properties of zigzag double-walled carbon nanotubes, Composites Part B. 57 (2014) 21-24
Semmah, “Chirality and scale rffects on mechanical buckling properties of zigzag double-walled carbon nanotubes”, Composites Part B, 57, 21-24, (2014)
Zhong, An energy-equivalent model on studying the mechanical properties of single-walled carbon nanotubes, Thin-Walled Struct. 44 (2006) 667-676
Semmah, “Chirality and scale rffects on mechanical buckling properties of zigzag double-walled carbon nanotubes”, Composites Part B, 57, 21-24, (2014)

Then, from the aspects of technology properties and technical performance, profound comparison is made between copper-clad steel and traditional conductors.
Last but not least, in order to analyze objectively, the paper based on a real 500kV substation to discuss from the point of economic properties.
This paper mainly focus on three aspects respectively: technology properties, technical performance, economic properties etc to make a profound comparison between copper-clad steel and traditional grounding conductors.
When the conductor temperature exceeds a certain value, then natural cooling in the soil, the mechanical properties of conductor will dramatically decline.
(3) Seen from economic properties, galvanized steel has lowest price for one time cost, but its subsequent investment is enormous.

The wear or damage of blades during the operation time caused by vibration, shock, abrasive wear, high temperatures exploitation and other negative factors [1].
Minimum allowance for the further mechanical treatment (about 200 μm), narrow heat-affected area (up to 100 μm), presence of fine-grained structure of built-up layer, minimum (local) energy deposition, increase of repair area of GTE blade surface, absence of heat treatment, higher mechanical characteristics of built-up layer refer to the characteristics of laser technology as opposed to argon-arc welding [8 - 15].
Level of variation Factors Dimensionless value Power, P, W Traverse speed, V, mm/s Feeding rate of powder, F, g/min +1,68 166 3.32 1.77 +1 200 4 2.12 0 250 5 2.65 -1 300 6 3.20 -1,68 334 6.68 3.53 To analyze the samples microstructure, the longitudinal and cross sections were produced.
Aerospace and Mechanical Engineering. 2016.
Influence of Technological Parameters of Direct Laser Deposition Process on the Structure and Properties of Deposited Products from Alloy Ti-6Al-4V.