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Online since: February 2019
Authors: Denis Levashkin, Pavel Ogin, Fedor Vasilyev
Efficiency of Hybrid Cyclic Processing with the Use of Additive Technologies on CNC Machines for the Manufacture of Composite Aviation Parts Due to the Reduction of Processing Errors Denis Levashkin1,a*, Pavel Ogin2,b and Fedor Vasilyev3,c 1Togliatti State University, 14, Belorusskaya St., Togliatti, Russian Federation 2Togliatti State University, 14, Belorusskaya St., Togliatti, Russian Federation 3Moscow Aviation Institute (National Research University), Moscow, Russian Federation aLevashkinD@gmail.com, bfantom241288@yandex.ru, cfedor@niit.ru Keywords: additive manufacturing, selective laser melting, aviation parts, processing error, CNC machine.
Additionally, due to the application of these techniques appears able fold reduction in the mass of the design part/component/product, while maintaining all of the pledged technical detail requirements (strength, hardness, wearability, etc.).
In detail the principles of modular recomposable data of the devices described in [20].
At the same time, for the expression (4) for the case of application of the solutions proposed in the work, in relation to the production of parts of the "Collector" type, there is a technological reserve for: - reduction of the error of the applied method of processing εmp due to the elimination of a number of machining and blade machining operations, - reduction of the error setting of the technological system of the machine εs due to the exclusion of a number of re-installations of the part, the use of normalized elements of technological equipment, the principle of unity and combination of technological bases, - reducing the error of the actual location of the workpiece details when it is installed in the device εl due to the exclusion of a number of resets of the part.
This leads to an increase in the number of components of the error, and according to (7) we obtain (8): εΣ1=kt∙εpm2+3Еi2+3Еb2+Еf2+Еa2+2Еdi22+εs≤ TА-(k⋅ TА)2 (8) Solution (8) is inequality εΣ1=0.325< 0.597, this indicates the accumulation of the total error at 50 % reduction of the specified accuracy of the size T under the specified conditions.
Online since: June 2015
Authors: Hassan Jumiah, Hui Wei Chin, S.A. Halim, Albert H.M. Gan, Siau Wei Ng, Kuen Hou Cheong, Lim Kean Pah
The resistivity decreased with the increased of grain size and crystallite size due to the reduction of grain boundary effect which might improved their grain connectivity.
Upon reduction in the size of magnetic samples to the nanometer scale, some of their basic properties become size dependent and differ from those of bulk.
The obtained XRD data were refined by the Rietveld’s refinement based on the consideration of low values of the residuals for the weighted pattern RWP, pattern RP, structure factor RF and goodness of fit.
From the Rietveld’s refinement data, the unit cell parameters (a, b, c), Mn-O bond length and Mn-O-Mn bond angle are varies through the sintering temperature suggested that sintering temperature might slightly change the structure formation of the samples.
Table 1: Data of the Rietveld refinements of X-ray powder diffraction data at room temperature of Pr0.85Na0.15MnO3 sinter at different temperature Sample S600 S700 S800 S900 S1000 Lattice Parameter           a(Å) 5.4737(6) 5.4615(6) 5.4426(4) 5.4399(3) 5.4541(2) b(Å) 7.6822(6) 7.6795(5) 7.6792(4) 7.6856(3) 7.6994(2) c(Å) 5.4505(5) 5.4488(5) 5.4557(4) 5.4524(2) 5.4501(2) V (Å3) 229.1967 228.5316 228.0212 227.9573 228.8669 Crystal Structure Orthorhombic Space Group P n m a (62) Bond Angle Mn-O1-Mn (o) 158.01 (4) 158.00 (4) 157.99 (3) 157.92 (2) 157.96 (2) Mn-O2-Mn (o) 157.17 (4) 157.18 (3) 157.15 (3) 157.19 (2) 157.23 (1) Bond Length Mn-O1 (Å) 1.903 1.901 1.900 1.920 1.900 Mn-O2 (Å) 1.959 1.959 1.963 1.979 1.959 REXP (%) 3.68275 3.68488 3.60079 3.6414 3.69959 RP (%) 4.00494 4.06252 4.02396 4.1310 4.33755 RWP (%) 5.13332 5.1865 5.17132 5.30207 5.66611 Goodness of Fit 1.9429 1.98108 2.06257 2.12008 2.34565 Crystalline Size (nm) 28.6 34.8 45.5 62.8 121.8 Particles Size (nm) 67 75
Online since: February 2013
Authors: Murava Raphinos Tackmore, Kargbo Obai, Mohamed Khaled Salahou, Xiang Ping Guo
Data collection and analysis Plant growth was measured as plant height, stem diameter and dry matter.
Data on plant height and stem diameter was collected every week.
Most of this data was collected at the final harvest.
We are also grateful toDesmond Ofosu, ChantallKwizera, Mark Boateng,KwakuAdjei and the laboratory group for their assistance in the analysis of the samples and data handling for providing excellent facilities for conducting the field experiment.
Bressan: Does proline accumulation play an active role in stress-induced growth reduction?
Online since: July 2022
Authors: Lorenzo Donati, Barbara Reggiani, Riccardo Pelaccia, Marco Negozio
The optimized designs showed temperature deviations below the 16 °C as well as the reduction of 50% in terms of nitrogen consuming.
The experimental data and the numerical simulations of the selected industrial case proved the cooling effectiveness of the original channel design but also the unbalance of the thermal gradient around the bearings and the non-optimal handling of nitrogen consuming, thus offering a suitable test case.
Therefore, only the main data are here synthetically recalled for the sake of clarity of the present work.
In terms of nitrogen consuming a reduction of about 60% was gain with both optimized designs.
The efficient investigation of the optimization design space allowed identifying and selecting solutions that led to a significant improvement of the cooling balancing around the bearings as well as to the reduction of the nitrogen consumption, obtaining temperature differences below 16°C in all selected configurations and the reduction of about 60% in terms of nitrogen flow rate.
Online since: December 2012
Authors: Xin Chen, Yi Shi, Hong Xiang Wang, Jian Ma
Same as the conclusion got from export coefficient model, the nitrate nitrogen concentration distribution map drawn by the field survey data indicated that planting was the main nitrogen load source of Damintun town.
The amount of soil chemical fertilizer and farmyard manure used in this area was calculated by a field investigation combined with the data of "Shenyang Rural Statistical Yearbook".
Thus combined with those data the cattle, pig, sheep and poultry excrement output coefficients in Damintun town were 10.21 kg·ca·a-1, 0.74 kg·ca·a-1, 0.40 kg·ca·a-1 and 0.04 kg·ca·a-1 respectively.
So rational fertilization is the key of reduction nitrogen pollution load.
Rational fertilization is the main way to reduction nitrogen pollution load in Damintun town.
Online since: August 2024
Authors: Sei Hyung Ryu, Daniel J. Lichtenwalner, Ki Jeong Han, Jeff Kim, Andreas Scholze, Hemant Dixit
An excellent agreement with measured data is obtained using this model, making it more suitable for predictive device simulation using TCAD tools.
We present a revised channel mobility model that is well calibrated and shows an excellent match with the available measured data from lateral 4H-SiC MOSFETs.
We performed an extensive recalibration of the SR and SP model parameters against measured hardware data, which leads to a different set of parameters developed for 4H-SiC.
As evident from these results, we obtain an excellent match with the measured data across a wide range of P-well doping concentrations and across the multiple temperatures (ranging between 25-175 °C).
We obtain an excellent match with the measured data across a wide range of P-well doping concentrations and across the multiple temperatures (ranging between 25-175 °C).
Online since: June 2014
Authors: Yahaya Ahmad, Aqbal Hafeez Ariffin, Hamzah Azhar, Solah Mohd Syazwan, Mohd Hafzi Md Isa, Wong Shaw Voon
The undesirable changes in liner thickness have explicit effect on the liner density which is translated into reduction in energy absorbing potential.
For the experimental test, a drop test machine Instron Dynatup 9250HV, a standard headform size M equipped with triaxial accelerometer, a hemispherical anvil and a data acquisition system were employed (Figure 1).
Among the data recorded were the headform centre of gravity peak resultant acceleration against time (in terms of gravitational acceleration, g), the impact speed and components deformation/crack status.
Nevertheless, the test proceeded to gauge the effect of these cracks on the headform acceleration data.
There was limited data to relate the result with the shelving conditions.
Online since: August 2005
Authors: Berend Denkena, F. Catoni, M. Reichstein
Therefore the target of a dressing process improvement must be a substantial reduction of the speed ratio.
Q = 310 l/min cool gear data: m = 4.5 mm; z = 24 n αn 0 a = 20°; = 0° d = 118 mm; x = 0.7 β dressing data: dressing roller D300 n = -1500 min v = var.
Q = 310 l/min cool grinding data: v = 30 m/s a = 0.25 mm c e v = 110 mm/min ft gear data: m = 4.5 mm; z = 24 n αn 0 a = 20°; = 0° d = 118 mm; x = 0.7 β dressing data: dressing roller D300 n = -1500 min v = var.; q = var.
A reduction of the dressing roller speed reduces substantially the relative speed between the grinding worm and the dressing roller itself on the contact surface.
Q = 310 l/min cool grinding data: v = 30 m/s a = 0.25 mm c e v = 110 mm/min ft gear data: m = 4.5 mm; z = 24 n αn 0 a = 20°; = 0° d = 118 mm; x = 0.7 β dressing data: dressing roller D300 v = 1.1 m/s a = 10 µm; q = 10 cd ed d n = var.; q = var.
Online since: November 2005
Authors: Evgueni I. Poliak, R.M. Skolly
The data from production hot mill are analyzed in conjunction with the results of laboratory high temperature mechanical simulations.
Mill data indicate that Al suppresses the effects of microalloying on softening of austenite.
Head end data averaged over several bars.
Fig. 5 gives the hot strip mill head end rolling force data for the same two steels.
Conclusions Mill data analysis indicates that Al suppresses the effects of microalloying on softening of austenite.
Online since: September 2018
Authors: Tayyaba Malik, Shayan Naveed, Mohammad Ali Mohammad, Muhammad Muneer
The chemical property of irradiated PI was characterized with XRD where the carbon peak was observed at 2*theta = 25.44, which confirms the reduction of PI material in to a graphene-like substance.
X-Ray Diffraction (XRD) data for PI and rPI was obtained using a STEO theta-theta diffractometer.
Similarly, Fourier Transform Infrared Spectroscopy (FT-IR) data for PI and rPI was obtained using a BRUKER Alpha.
PI substrate shows a very high intensity peak at 2θ= 25.44 and after laser irradiation the reduced PI material shows a small low intensity peak at 2 θ =25.44 which indicates the reduction into the graphene like material.
Laser reduction is a low cost and relatively straightforward method to reduce PI and convert a surface layer into a carbonized material having high porosity.
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