Search results

In this paper, Time-domain and frequency- domain analysis of test data was implemented based on the method of wavelet denoising, the fault location was determined, and the vibration fault indicators and frequency components were obtained.
The research layed the foundation for the study of noise reduction and optimization of the wind turbine gearboxes.
Meanwhile, a computer was used to collect the vibration data.
Time-domain analysis of the gearbox experiments test data The time-domain waveform derived from  the acquisition signal processing are shown in Fig.6 and Fig.7. 
Table 2 Measured values of kurtosis, peak indicators and the envelope rms value measure point kurtosis [(m/s2)4] peak indicators envelope rms value [(m/s2)2] vertical input of high-speed shaft 1.07x10-8 12.4259 0.03197 axial output of intermediate shaft 1.42x10-7 13.106 0.11693 level output of high- speed shaft 7.54x10-8 17.2213 0.05437 axial output of high- speed shaft 3.89x10-8 15.4448 0.05427 Frequency-domain analysis of the gearbox experiments test data When shaft bending or gear fault appearing, the working process of the gearbox will appear gearbox impact at a regular interval, and the impact energy was great.

The novel Fomichev plug described in this paper is of characteristic producing equal unit-reduction of wall thickness along its perforation section during seamless tube piercing, which designed on the base of the roll opening of Julong piercer, taking into account for both feed angle and toe angle of a cone type piercer.
The material model of steel grade P91 is built using the data from a Gleeble test program.
The perforation section generatrix of the novel Fomichev plug discussed in this paper is represented by formula (1): ， (1) where RLr(x) is plug diameter at the point x in axial coordinate; R(x) is the roll opening at the point x in axial coordinate; SHE is the ideal wall thickness of hollow shell at the intersection between perforating and smoothing section of the plug; Cav is the average reduction ratio of wall thickness.
This kind of plug is somewhat universal, but its flaw is that the wall-thickness reduction of workpiece focuses on one part of the plug in piercing.
The new plug is of characteristic producing equal unit-reduction of wall thickness along its perforation section during seamless tube piercing without excessive concentration of metal deformation.

Mg-2Zn-0.3Gd sheets processed by large strain hot rolling with one pass of 80% reduction at 200°C and 250°C were selected to investigate the rolling temperature effect on the microstructure, texture and mechanical properties of Mg-2Zn-0.3Gd sheets after rolling and subsequent annealing.
Three specimens were used for each test condition to ensure the reproducibility of the data.
Actually, during the multi-pass small reduction hot rolling process Mg alloy usually deformed with basal slipping and tensile twinning due to their lower CRSS.
This microstructure difference is an obvious characterization for Mg-2.0Zn-0.3Gd alloy produced by traditional multi-pass small reduction hot rolling process and large strain hot rolling.
And it can be conclude that the above mentioned microstructure difference most probably related to the element Gd addition and large reduction performed.

Beneficial effects of reduced heat input, and the corresponding reduction in welding-induced residual stresses, created an overall reduction in distortion in the assembly and improvement of the armor performance.
The V50 value is an average calculated using measured impact speed data.
The armor plates were modeled using material properties of MIL-DTL-46100, Class I high hard steel [7], and AISI 8630 triple alloy steel which has a similar chemistry and for which strength vs. temperature data is readily available, (DIN 1.6545).
The ABAQUS [8] isotropic material hardening laws were followed using the material true stress-strain data presented here.
One estimate was based on examining the microhardness data, the microstructure and the phases observed in the etched cross sections, and the other was based on the maximum temperature found in the finite element models.

In this work, Response surface method was used based on data provided by Finite element modeling to construct a model for the bulge height as a function of geometrical factors for T-type bi-layered tube hydroforming.
Compared with conventional metal forming processes, tube hydroforming has the merits of a reduction in work piece cost, tool cost and product weight.
Figure 3: Experimental result Figure 4: Numerical result Figure 5: Experimental and numerical hydroformed branch profile Experimental Design Response Surface Method was applied using statistical software, Design-expert V7 [9], to the numerical data obtained based on the finite element model described in the last section.
Resultant bulge height and wall thickness reduction were modeled as functions of the geometrical factors listed in (Table. 2) with the mentioned experimental ranges.
(Fig. 6) shows the relationship between the actual and predicted values of bulge height and thickness reduction.

And the relation between partial texture of different grains assembly and its mean grain size can be expressed by an empirical formula from experiment data. 1.
Subsequently, grain size distributions and partial textures of various size grains have been calculated from EBSD measurements for each annealing condition and an empirical formula which incorporates both grain size and partial texture is proposed according to experimental data. 2.
The initial steel plate was commercially hot rolled, and then cold rolled to 0.8 mm with a reduction of 80% at room temperature.
It can be seen that the empirical formula proposed above can fit the present experimental data.
At same annealing temperature for different annealing time, grain size distribution and partial texture is similar, and the partial ODFs can be expressed by an empirical formula from experimental data.

Complementing the XRD data with SE results (Fig. 1b), where the imaginary part of the dielectric function for large grain and fine grain poly-Si references are plotted, it is possible to deduce that the grains become smaller as the Ni layer thickness increases.
There, it is possible to see that despite being polycrystalline the samples prepared using 1 nm and 2 nm of Ni present a lower ε2 value and a reduction of the direct transition peaks intensity, as it also occurs for fine grain poly-Si reference. 20 30 40 50 60 a) <311> <220> <220> <220> <111> <111> <111> 2 nm 0.5 nm 1 nm Intensity (a.u.) 2 theta (degrees) 2.5 3.0 3.5 4.0 4.5 5.0 5 10 15 20 25 30 35 40 45 2 nm 1 nm 0.5 nm large grain reference b) εεεε2 Energy (eV) small grain reference Figure 1: Structural characterization of the crystallized samples: a) XRD data and b) SE data showing large and small poly-Si references The use of thick Ni films is responsible by the increase of the Ni density leading to the formation of more NiSi2 crystallites that act as nucleation sites [6].
The Ion/Ioff ratio obtained was of the order of 5.5×10 4, which can be still improved (at least one order of magnitude) by proper reduction of Ioff.
When the thickness of the Ni layer increases, this leads to the formation of smaller grains and to films with an increase on the metal's contamination, leading to degradation on the electrical characteristics of the TFTs, as can be seen by the data shown in table 1.
The data show that the device works in the enhancement mode and it presents a very good hard saturation current.

The spectra show a good agreement between the experimentally obtained and modeled data set.
The data presented with open circles are extracted from [10].
The obtained phonon positions together with the literature data are given in Fig 4.
Two different data sets were generated corresponding to the comparison with E1(TO) data of [9, 10], respectively.
This incompleteness in the data sets may cause deviations in the strain values compared to HRXRD.

XRD data were collected using a Siemens D5000 X-ray diffractometer (Cu Ka radiation).
In these figures, the dots represent the experimental data and the continuous line is the simulated pattern obtained from the Rietveld refinement analysis.
The simulated XRD data and the experimental data match very well, with a Rwp of 13.95.
This rapid reduction in the crystal size is accompanied by an increase in cell volume.
The structural data obtained here exhibited lattice spacings compatible with monoclinic and orthorhombic symmetries.

(4)Real-Time Load Model The load model uses the typical year-week curve, week-day curve and day-hour curve to acquire real-time load data.
Real-time load is calculated as follows: (3) is the peak load,, the ratio of the week load to the maximum load, altogether 52 data, , the ratio of daily load to the maximum load of the weeks, altogether 7 data, and , the ratio of the hour load to the maximum load of the day, altogether 24 data.
That is, if there is a reduction in the load in the last time period, then all the load can be connected at this time, then charge the battery.
If the volume lack at this time is equal to last time, there are no further reductions and no re-accession.
If greater, a further reduction is needed.