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Online since: October 2013
Authors: Shui Lin Tu, Zhen Yi Wu, Zheng Yang Wu
Based on cascaded bistable system, multiple resonance noise reduction can be undertaken to constantly shift the noise energy, thus the method of filtering effect is very obvious and can effectively achieve the detection of weak signal [12].
The cascaded bistable system can transfer the high frequency energy constantly and the high frequency is gradually filtered out, achieving good noise reduction and reshaping effect.
Take the first 100 seconds of the signal data as a data segment, join the 10 data segments in series, after superposition of 0.15 Gaussian white noise, the signal waveform is shown as in figure 5 (a).
Online since: December 2014
Authors: Yu Hui Wang, Jian Ping Wang
Experimental Facility and methodology Fig. 2 Experimental system The experimental system shown in Fig. 2 mainly consists of a gas supply system, a cooling system, a data acquisition system, an ignition system, a combustor and an exhaust system.
The gas supply system, supplying hydrogen and oxygen to the combustor and the predetonator, includes gas sources, reduction valves, check valves, solenoid valves, singlechips, mass flow controllers and pipes.
The reduction valves are able to maintain a constant pressure at the valve exit.
The data acquisition system acquiring pressure signals consists of the PCB dynamic pressure sensors 113B22 and a data recorder.
Online since: December 2013
Authors: Kuan Yew Wong, Seyed Ali Mirzapour, Seyedeh Sabereh Hosseini, Reza Ahmadi
The new improved layout will provide a reduction of distance, cost and cross-traffic to have an efficient production layout.
The data collection fields including P (Product), Q (Quality), R (Routing), S (Supporting), and T (Time) should be considered to ensure the validity of input data.
Flow Process Chart Table 2.Total travelling distance and closeness rating Departments Distance (m) Closeness Rating Departments Distance (m) Closeness Rating Departments Distance (m) Closeness Rating A - C 272 I F - G 474.5 E J - N 152 I A - X 618 E G - U 265 I J - L 2835 A C - D 344 I G - T 860.75 A L - R 1650 A C - U 297 I G - N 188 I L - N 117 I C - X 85.75 I G - L 3430 A L - M 665 E D - E 514.5 E G - I 864 A M - U 499 E D - F 745.5 E H - U 436 E M - Q 8417.5 A D - H 1008 A N - R 122 I O - V 464 I D - N 552.5 E H - N 93.75 I O - U 88 E D - U 340 I H - J 445.25 E O - S 147.2 I E - U 375 E H- I 455 E R - U 329 I E - R 162.5 I I - U 383 E R - T 1036.8 A E - N 129 I I - R 434 E S - X 112.2 I E - I 812 E I - N 96 I T - V 688 E F - U 411 E I - J 621 E U - V 138 I F - N 114 I J - U 299 I Total 35184.95 F - I 644 E J - T 954.25 A Based on these data, the relationship of each activity is depicted in Figure 3.
The estimation of cost reduction begins with the calculation of the travelling cost per one meter unit.
Online since: October 2014
Authors: Beniamin Vasile Chetran, Dan Mândru
Speculating this phenomenon these fluids can be easily integrated in mechanical structures as dumpers, brakes, valves, liquid crystal displays and noise reduction mechanisms (Fig. 1 – a), [5, 6, 7].
This resistive force is measured as a torque at a certain speed; as a reduction in speed for a specific torque or both, [8, 9, 10, 11].
All data were recorded into a measurement sheet as in Table 1 and the results were analysed form plots of measured current and angular velocity.
In the next experiments this dependency must be measured and token into account when the data are interpreted.
Rani, Viscosity of Liquids Theory, Estimation, Experiment, and Data, Springer, (2007) [12] C.
Online since: August 2022
Authors: Yan Li, Alberto Maria Gambelli, Federico Rossi
CO2 hydrates have comparatively moderate thermodynamic formation conditions, which is of increasing significance to human society as carbon reduction and sequestration are themes of rising interest[3, 4].
Figure 1(a) showed the phase condition testing system, consisting of a small-scale reactor with the inner volume of 0.949 L, a refrigeration system and a data acquisition system manufactured by National Instruments.
Judging from the relevant thermodynamic data of previous studies[14], we presumed that both hydrates and ice formed in the experimental conditions.
However, pressure reduction slowed down in reactions below 0 ℃ due to the ice formation competing with hydrates for space.
Journal of Chemical & Engineering Data, 2014, 59: 2630-2633
Online since: November 2013
Authors: Charoen Nakason, Nattapon Uthaipan, Anoma Thitithammawong, Banja Junhasavasdikul
Specifications of the INS and the KND intermeshing rotor mixers Specifications INS KND Capacity (cm3) 1,000 3,200 Rotor outer diameter; D (mm) 95 142 Clearance between rotor tip and chamber wall; H (mm) 1.5 2.5 Surface area of rotor (cm2) 815.6 2,319 Surface area of chamber (cm2) 644.3 2,769 Specific area of mixer with rotor (cm-1) 1.46 1.59 Main motor power (kW) 7.5 29.8 Temperature control unit Electric heating system Water heating system Results and Discussion Processing Characteristics Figure 1 shows mixing data of the EPDM/PP TPVs obtained from the INS and the KND mixers.
Thereafter, reduction of the mixing torque correlates to morphology development and possibly also to degradation of the PP phase in the presence of peroxide via beta-scission [6].
Mixing data of the EPDM/PP TPVs using (a) INS and (b) KND mixers.
Additionally, the INS mixer also provides the TPV with higher crosslink density, see data in Table 4, and this also contributes to the mechanical properties.
Moribe, Advanced intermeshing mixers for energy saving and reduction of environmental impact, Mitsubishi Heavy Ind.
Online since: May 2011
Authors: Hui Ping Song, Huai Gang Cheng, Xin Gang Li, Fang Qin Cheng
Table 1 The parameters involved in the model Parameter Symbol Value Source bacteria radius b 1μm measured wire radius a 25μm measured wire saturated magnetization Ms 1.3×106 A m-1 [12] fluid magnetic susceptibility χf 5×10-5 m3 kg-1 [12] magnetic intensity H0 200~1200 Gs measured fluid viscosity μ 1.01×10-3 Pa·s [12] permeability of vacuum μ0 4π×10-7 N A-2 constant filling ratio 1-ε0 2.45×10-5 measured loss constant g 1~2 [9] critical trapping angle θ0 17.6° [13] magnetic susceptibility χp 1.01×10-3 m3 kg-1 [13] flow velocity u0 0.5~5 mm s-1 measured initial concentration C0 0.05~0.5 g L-1 measured Model verification The accuracy of the model could be examined by the comparison between the experimental data (Exp.) and the calculated results (Cal.) under different magnetic intensity, initial concentration and velocity.
It revealed the rise of velocity led to the reduction of magnetic separation efficiency.
In summary, by the comparison between experimental results and simulated data in Fig.1-3, the two sets of data well accorded with each other, which indicated the reliability of the model.
Consequently the magnetic intensity near the metal wire surface after the trapping process was much weaker and so was the magnetic force to the particles, leading the reduction of the separation efficiency.
Online since: September 2005
Authors: Rogerio Bairrao, Marcin Chrzanowski, Joaquim Duque, Pawel Latus
Data Acquisition Acquisition Set Up.
As an example of the ultrasonic measurements Figs 6 to 8 shows the sound speed reduction along the beam axis, with the number of stages applied.
Sound speed reduction precedes final collapse of each beam and can be dealt with as a warning of oncoming structure failure.
When failure occurs, the damage parameter Ω is equal to one and Eq. (5) becomes: ∑= = + k i i m i 2 1Na1mC 1 )( (6) where the constants C2 and m have to be found from experimental data.
Test Design, Implementation and Data Acquisition (ECOEST/PECO Project, LNEC/C3ES Report, 99/97, May 1997)
Online since: November 2011
Authors: Y.S. Choy, Kin Tak Lau, Yang Liu
The achievement of noise reduction is better and the installation of plates is more user-friendly than that of the membranes.
Roughly speaking, there is quite good agreement between the numerical simulations and experimental data.
Figure 4(b) shows the experimental data for 3CF tows on PMI foam which successfully shows that there are three peaks and the stopband f2/f1=2.5 (dimensional frequency f *=210Hz to 510Hz).
The experimental results roughly agree with the data from the numerical simulation for two-plate silencer using CF reinforced PMI foam.
Technical note: noise reduction in an exhaust stack of a papermill.
Online since: April 2019
Authors: T.A. Nizina, N.S. Kanaeva, N.M. Kuznetsov, D.A. Artamonov, Dmitrii R. Nizin
The proposed method is based on the use of data read using advanced test equipment making it possible to record changes in stresses and strains during the application of high-frequency mechanical loads to a sample [11, 12].
The time interval from the beginning of deformation to 40 seconds of loading is characterized by a reduction in the average stress increase from 0.10÷0.11 to 0.6÷0.7 MPa per every 0.16 seconds; at the same time, the characteristic under study in this segment varies from 0.03 to 0.14 MPa.
The analysis of data in Fig. 2 (b) shows a significant gradient in the studied parameter (from -0.02 to 0.13 MPa) recorded in the time interval of 49.28÷44.94 s, comparable to the stress reduction when reaching maximum tensile force.
Time series of the growth of tensile stresses in the epoxy polymer sample depending on the reading step: a – 0,01, b – 0,16 s Discussion Analysis of data reflecting the change in the fractality index depending on the loading duration determined with the shift of the analyzed segment with a step of points, showed (Fig. 3) that the destruction process (to the right of the red line) is characterized by an abrupt decrease in this parameter varying at loading in the interval from 0.33÷0.82 to zero.
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