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Online since: August 2010
Authors: Bang Jun Lv, S.J. Zhu, J.F. Xing
Introduction Parallel manipulators are widely accepted as ideal candidate in various applications for their inherent superior properties compared with their counterparts, such as higher rigidity, better positioning accuracy, high load capacity and simpler inverse kinematics.
,L Uα α are the lower and upper boundaries of these design variables considering the manufacture and machining factors.
First, a weighting factor based typical genetic algorithm is introduced in simulation.
Weighting factors in Eqution 17 are choosing as: 12 3 0.2, 0.5, 0.3 w w w = = = .
The weighting factor method is adopted to transfer the multi-objective optimization to single-objective by setting a set of factors to make compromise between conflicting demands.
Online since: April 2014
Authors: Jun Zhou
With the analysis, the major influence factors of automobile braking performance would be obtained and then improve the performance by parameter optimization would be improved.
The test has many factors like repeatability, unconstrained text time, the result obtain convenient, high veracity and test process reproducibility.
Adopting produced car model, simulated test has relative property.
The impact analysis method of many factors, such as tire structure parameter, spring stiffness, braking initial velocity, are similar to the first three analyses.
[4] Mechanical Dynamics Inc.ADAMS/Help Documentation[Z].
Online since: October 2011
Authors: Ke Tian Li, Wei Hao Zhang
In order to avoid the disadvantages and unfavorable factors, vacuum coating way arises at the historic moment.
The bearings are connect with the top panel(11) to ensure the smooth turn and no affect to the entire turn.
According to the gear properties, choose the coefficients of gear, calculating load coefficient as given below. .
Beijing: mechanical technology press. 2003.11.
[8] Daxian Chen: Mechanical design manual. 5 edition.
Online since: December 2013
Authors: Yu Chao, Dong Sheng Wang, Ting Zhang
The basic physical and chemical properties of soil samples is shown in Table 1.
Table 1 The basic physical and chemical properties of soil samples Soil samples PH OM [g·kg-1] CEC [cmol·kg-1] Mechanical composition Clay Silt Sand Loam 8.29 10.26 16.68 7.86 55.60 36.54 Sandy 8.2 29.81 20.17 4.60 32.36 63.04 2.2 Adsorption kinetics test Guideline OECD is used in adsorption test[7].
Table 2 The fitting results of the three kinetic equations in OTC soil adsorption characteristics Soil samples First-order kinetics equation Two-constant rate quation Parabolic equation R2 SSE R2 SSE R2 SSE Loam 0.9633 0.0007 0.9378 0.0001 0.7083 211.3 Sandy 0.8918 0.0001 0.8917 0.0001 0.8784 0.0001 From Table 2, the adsorption process can be well simulated by three models, so it can prove that adsorpted OTC by loam and sandy is controlled by reaction rate and diffusion factor. 3.3 The effect of PH value for adsorption Antibiotics are polar compounds, that are more complicated compared with nonpolar compounds.
[12] Kulshresth A P, Rossman J R F G, Aga D: Investigating the molecular interact ions of oxytetracycline in clay and organic matter: insight s on f act ors affecting it s mobility in soil [J].
Online since: October 2010
Authors: Serena Cattari, Sergio Lagomarsino, Hormoz Modaressi, Kiriazis Pitilakis, Vlatko Bosiljkov, Djillali Benouar, Dina D’Ayala, Chiara Calderini
Lacks in knowledge are usually considered as uncertainties affecting the modelling of the structure.
Thus, a decreasing degree of knowledge imposes to consider increasing safety factors and, thus, lower conventional resistances.
In general, this means that a maximization of the knowledge of the structure (in term of geometry, material properties) may lead to a minimization of the interventions to guarantee acceptable safety levels.
In fact, applying the same models and safety factors proposed for new structures to historical structures is usually inappropriate and leads to invasive interventions, in order to assure seismic safety of historical buildings, which are in collision with conservation requirements.
In particular, such methodologies will be based on quick surveys and will be focused on simplified mechanical models or statistical models (derived by damage assessment data, obtained by previous earthquakes).
Online since: February 2014
Authors: Ari Adi Wisnu, Azwar Manaf
Those substituted ABO3 based materials have shown possessed microwave absorption properties discussed in the frequency range of 2- 18 GHz.
The magnetic properties were evaluated using an Oxford Instrument Vibrating Sample Magnetometer (VSM).
The quality factors of fitting, R (criteria of fit) and χ2 (goodness of fit) were considered acceptable.
As to microwave properties the LBFMTO_nano has indicated certain microwave absorbing properties in the frequency range of 9- 15 GHz, whose value of the absorbing peaks are -9 dB at 9.9 GHz; -11.5 dB at 12.0 GHz and -25 dB at 14.1 GHz.
Gao, Microwave absorbing properties of La0.8 Ba0.2Mn0.3 nano-particles, Trans.
Online since: March 2007
Authors: Akihisa Inoue, Yoshihiko Yokoyama
One of the special interest of glassy alloys is a mechanical property because a glassy alloy exhibits flexible metallic bonding and aperiodic structure.
We also investigated about the Young's modulus of Zr-TM-Al (TM: Cu, Ni and Co) BGAs with small additive elements to clarify the relationship between the glass structure and mechanical properties.
On the other hand, we have been studying on fatigue properties of BGAs because the ordinary BGAs exhibits low fatigue limit.
On the other hand, the glass structure should be classified into amount of fine states to recognize the relationship between the volume change and mechanical properties in detail.
Summary In order to reveal the relationship between the glass structure and mechanical properties, we tried to control the volume change/free volume of Zr50Cu40Al10, Zr65Ni25Al10 and Zr55Co30Al15 BGAs with small additive elements.
Online since: July 2006
Authors: Anthony P. Reynolds
Other factors which affect the FSW response variables include several critical material properties: e.g.
Weld peak temperature, and time at temperature, play critical roles in the development of the weld structure and properties.
It is of great interest to understand how to manipulate weld control variables to tailor those properties.
Details of the form and derivation of the viscosity formulation have been published previously.[2,3] As a baseline, mechanical and thermal properties for the aluminum alloy 6061 were assigned to the "fluid".
Pertinent temperature dependent properties (thermal conductivity, heat capacity, shown in table 1) of 6061 were also used.
Online since: June 2018
Authors: Emilia Skołek, Abdelhamid Hussein, Dawid Myszka, Adel Nofal, Mostafa Ahmed
Introduction Austempered ductile irons (ADI) with its unique ausferritic microstructure which have superior mechanical and physical properties.
As mentioned before, retained austenite plays a significant role in mechanical properties.
The mechanical properties of IADI is controlled by the interaction between the strain hardening component, i.e., retained austenite and ferrite.
All these factors are determined by the heat treatment parameters i.e. austenitizing and austempering temperature and time.
Mechanical properties of both unalloyed and alloyed ADI and IADI samples.
Online since: September 2013
Authors: Yi Jun Huang, Yu Yu Huang
The most important factor which can cause water and soil loss is rainfall.
The configuration rate of paintings does not affect stain size but affects the tone of stain).
From the experience of the researcher, the probable reason for which the water-drop height in the experiment can affect the stain diameter is: when the height between the raindrop and the filter paper reached a certain level, there was enough kinetic energy.
In fact, the raindrop under the natural condition would be affected by the wind force and the error in the raindrop diameter calculated by using the stain diameter method would be greater.
After the relationship between the stain diameter and the simulative water-drop diameter is defined, the filter paper can be used for recording the raindrop information and furthermore, we can infer the energy of the unit rainfall of the one-time rainfall in a unit area and study the mechanical properties of the raindrop.
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