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Online since: January 2013
Authors: Milan Brandt, Aleksandar Subic, Mohammad Babaee, Martin Leary
Additive Manufacture The ASTM [1] defines Additive Manufacture as the "process of joining materials to make objects from 3D model data, usually layer upon layer, as opposed to subtractive manufacturing methodologies, such as traditional machining.”
Robust (left), Compromised (centre), Failed (right) Based on this experimental data, the minimum build angle fmin, versus orientation angles α1 and α2, data for the polyhedra of interest (Figs. 9-12) can be presented in terms of the associated FDM integrity.
This data will be of interest to researchers and practitioners who will may, under certain circumstance, allow a geometry that includes some surface defects, but is nonetheless self-supporting.
The combination of FDM integrity data and charts of minimum build angle allows the feasibility of for self-supporting geometry to be presented.
This data can be utilised in the design of tessellated geometries with known build orientations
Online since: August 2011
Authors: Xiao Yao Qian, Ping Ping Wang
In this paper by means of noise and vibration measurements, meanwhile carry out statistical and analysis for the measured data to find the influence size of various factors with quality analysis tool, and then adopt some corresponding measures to control the motor noise, hoping to improve the motor quality.
Through the measurement of motor noise and vibration, while the measured data for statistical analysis to identify the size of the various factors and choose to modify the methods of motor noise and vibration, hoping to improve the motor quality, meanwhile, increase motor products on the market share.
Through a series of tests and the actual measurement data, then analyze them.
Magnetic noise reduction of induction machines[J].
The analysis and noise reduction method of three wire asynchronous motors mechanical vibration and noise[J].Shanghai Medium and Large Electrical Machines,2007(3):18-20
Online since: May 2016
Authors: Monica Cîrstoiu, Razvan Ene, Catalin Cirstoiu, Iulian Antoniac, Mihai Nica, Patricia Ene, Zsombor Panti, Marian Pleniceanu
The data was analysed using Student's t-test and a comparison between the two groups was devised.
The data was analysed using Student's t-test and a comparison between the two groups was devised.
All clinical data and statistics related to the patients involved in our study are shown in table 1.
Our results are consistent with the data reported by others concerning union times [15].
Meta-analysis of data sugests that reconstruction type cephalo-medullary nails may provide superior results [16].
Online since: March 2012
Authors: Shu Qiong Chen, Xiao Tian Lv, Shen Shun Ying, Lv Gao Lin
The operational modal is analyzed using PolyMAX method with responsive data of key point in broaching machine, which is excited in practical broaching operation and tested by LMS SCADAIII-105 system.
At the end of the article, we summary and discuss the results of this work, and offer a proposal about optimization of physical construction and cutting velocity , in vibration damping and noise reduction of broaching machine, according to the existing analysis results.
The PolyMAX needs FRFs as primary data and identifies a right matrix-fraction model: (1) Where, is the FRF matrix containing the FRFs between all m input and all l outputs; is the numerator matrix polynomial and is the denominator matrix polynomial.
The polynomial coefficients and are assembled in following matrices: , (6) Choose in arbitrary frequency, equations can be formulated from the measured FRF data.
As the participation factors and the poles are estimated based on the polynomial, by consequence, equation [11] can be formulated from the measured FRF data in different frequency.
Online since: May 2011
Authors: Kai Xiang, Guo Hui Wang, Wei Ping Han, Jiang Tao Yu
For unidirectional CFRP sheets, obtained from the manufacturer’s data sheets, the nominal thickness of one ply of the CFRP reinforcement tcf is 0.111 mm.
For epoxy resin, obtained from the manufacturer’s data sheets, the bonding strength of epoxy resin primer is 3.2 N/mm2.
Load cell was recorded automatically at each load increment for using data logging equipment.
With width reduction coefficients, the rectangular cross section was translated into indented cross section, as shown in Fig. 8.
The reduction of bending stiffness exhibited the influence of fire exposure for the fire-damaged beam.
Online since: August 2013
Authors: Lin Wu, Si Yu Hao, Ting Ting Yang
Analysis of energy consumption during operation of the elevator Analyze the operation process of the traditional elevator:In the traditional elevator running process, car displacement distance is equal to counterweight displacement distance.Suppose the mass of car is,the mass of counterweight is,load M.When elevator is moving up,if,the gravitational potential energy reduction of counterweight less than the increment of car and load,the motor output power is (M0+M-1.5t)gh.
If ,the gravitational potential energy increment of counterweight less than the reduction of car and load,excess energy consumption in the form of heat.Likewise,when elevator is moving down,if,the excess energy consumption in the form of heat.On the contrary,if,the motor output power is (1.5t-M0-M)gh.
As for new energy-saving elevator,suppose the load of elevator is ,the car rising distance is,so the the counterweight drop distance is ,the car running speed is,so the counterweight running speed is.According to the relation between work and energy,when elevator moving up,the increment gravitational potential energy of car and load is W1=(M1+M0)gh1,the reduction gravitational potential energy of counterweight is (1) The formula show that .Energy transformation principle is the same on progress of moving up and down.[3] From the above analysis,under ideal conditions, the gravitational potential energy variation of car equal to the variation of counterweight..Considering the machinery energy loss and CVT transmission efficiency,the transform of gravitational potential energy may not reach one hundred percent.The difference is provided by the motor.According to the mechanical manual, CVT transmission efficiency is 90%,the motor output power is
radius Parameter values 2m/s 1000kg 1000kg 0.90 44.8kg.m2 420mm Take the following relationship:,the ratio of car speed to counterweight speed is.At the same time,the ratio of car vertical distance to counterweight vertical distance is Fig.3 (a)Elevator running distance(b)Elevator speed(c)Elevator acceleration(d)Elevator jerk Elevator car running distance is shown in Fig.3(a),the change of acceleration of the car is shown in Fig.3(b),the acceleration and jerk(differential acceleration of time) are shown in Fig.3(c) and Fig.3(d).Enter the MATLAB, type SIMULINK in the command bar enter the simulation interface,establish the simulation system block diagram(shown in Fig.4) according to the logical relationship between the transmission of information.Then set the initial parameters of each link, which can carry on the kinematics simulation analysis to mechanism.[4]The scope can display all the motion parameters, we can also the simulation results as a data
Online since: July 2013
Authors: Zuo Hua Wang, Jia Hui Zhang, Hua Zong, Wei Wang, Hong Bo Fang
In order to establish the accuracy and reliability of the collected data, all tests were replicated twice and the experimental blanks were run in parallel.
Effects degree between metal ions with HPAM was investigated by studying spectra reduction, and interaction mechanisms were studied by the shift of spectrum.
This trend is attributed to the shielding effect [3, 4], which leading in turn to a reduction in electrostatic repulsion and consequently to a less significant expansion of the polymer coils in the solution.
With oxygen in sewage, Fe2+ mainly by reduction causes the disintegration of the HPMA.
Online since: April 2009
Authors: Michael Ferry, K.D. Lau, M. Zakaria Quadir
.%) Al sheets were brushed, stacked and roll-bonded at room temperature to 50% reduction per rolling cycle for up to at five cycles.
The arrangement shown in Figure 1b was cold rolled without lubrication to 50% reduction in a single pass using a two high rolling mill with 210mm diameter rolls rotating at 10m min -1.
The shear strain, γ, was calculated from the rolling reduction, r, and the shear angle, θ, at each thickness location using [4]: ( ) ( ) 2 2 1 1 tan ln 2 1 r γ θ r r r − = ⋅ − − (1) and the equivalent strain εeq was calculated using [4]: 2 2 4 1 ln 3 1 3 eq γ ε r   = +  −  (2) Figure 2b shows the distribution of shear strain as a function of distance from the surface to the mid-thickness of the sample.
The best fit of the data in figure 2b generates the following empirical relation: 5 4 3 2 )/(9.503)/(3.750)/(4.422)/(9.112)/(6.145.1 o o o o o tt tt tt tt tt − + − +− −=γ (3) This overall strain distribution throughout the sample thickness is given in figure 2c.
Online since: October 2015
Authors: Howard Smith, Parvathy Rajendran
The battery energy density and solar efficiency’s extrapolated forecast data do not show any sign of technology maturation.
Methodology Data on solar-powered electric UAV model specifications were obtained from a previous work [18] because of the availability of such data and the successful flight tests already conducted.
Solar efficiency’s extrapolated forecast data show a linear increase with time at roughly 0.47% per year.
In addition, the reduction in control weight decreased to 23.0% and it is nearly 0.09 kg in 2036.
Both battery energy density and solar efficiency’s extrapolated forecast data do not show any sign of a maturing technology.
Online since: October 2013
Authors: Shun Bo Zhao, Yang Yang Xu, Yu Tao Li
Based on the test data, the formulas for forecasting the carbonized depth of MSC are suggested.
Meanwhile, as the larger water to cement ratio was got by decreasing the cement dosage with constant water dosage, which brought about the reduction of cement hydrates that could be carbonized.
The follow forecast model of carbonized depth of MSC will based on the analyses of test data in these ranges.
Fig. 3 and Fig. 4 show the fitness of above formulas with test data.
Fig. 3 Fitness of formula (1) with test data Fig. 4 Fitness of formula (2) with test data Conclusions To improved the engineering application of concrete with machine-made sand, the resistance of this new concrete to carbonization was studied with the comparison of ordinary concrete.
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