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Online since: May 2015
Authors: Marek Szablewski, Sarah Dempsey, David Bloor, Del Atkinson
Optical properties of the touchscreen were assessed using a spectrophotometer to measure the transmitted light over the range of visible wavelengths.
Both the force-resistance profiles and the optical properties of the layer are dependent on the granule loading and composition.
The force-resistance profile and the optical properties of the resulting touchscreen can be controlled by the size and composition of the functional granules in the composite ink.
The optical properties of the ITO/glass substrate and force sensing layer were determined using a spectrophotometer to measure both total transmission and diffuse transmission (haze).
Upon Table 1: Ink compositions and optical properties.
Online since: November 2013
Authors: Ming Yang, Yang Bai
On the other hand, vibration-assisted machining combines metal forming and small amplitude tools vibration to get lower forming load or better products property.
The chemical composition and mechanical property is listed in Table 1 and Table 2.
Mechanical properties of C5191.
RCA is an important factor that cannot be ignored in metal surface deformation.
In this study, due to the existence of vibration, the deformation of metal foil may be affected by vibration frequency.
Online since: June 2012
Authors: Jiao Yang Chen, Wen Wei Wang, Cheng Jun Zhou, Cheng Lin
Therefore, it’s of great significance to optimally design the bus body on the basis of mechanical characters and vibration performance finite-element analysis in various working conditions.
Mesh density is the most important factor to affect the accuracy and efficiency of the bus crash simulation.
Then define the element material properties, including Young modulus, Poisson’s ratio, density, etc.
Mesh quality represents the rationality of the element geometry and will affect the calculation accuracy.
Define the design variable as the thickness of the pipe, separately set the initial value, maximum and minimum values of thickness for different parts and associate the design variable and thickness property in PSHELL card.
Online since: July 2012
Authors: Jian Feng Wang, Zhong Xiang Lei, Chuan Xue Song
In recent years, with electronic technology, measurement and control technology, mechanical dynamics, and other disciplines of rapid development, make the automobile suspension system vibration isolation from the traditional passive to active vibration control.
The mechanical model of automobile suspension In the research of automobile suspended frame nonlinear vibration characteristics research must be established according to the mechanical model of automobile suspended frame commonly used automobile suspended frame model has three: namely 1/4 vehicle suspension model, 1/2 car suspension model and vehicle suspension model.
In order to simulate the quality, tire body due to the stiffness and damping coefficients of shock absorber change such as uncertain error, application h-infinity optimal control method can make the automobile suspended frame vibration control has strong adapt to the ability of uncertain factors [6].
Using the optimal control method to foresee, foresee a time choice to the control effect is affected.
Hefei university of technology and FangXiBang will fuzzy control technology application in automobile semi-active control suspension [9], in the real car in the process of application, vibration properties are better than those passive suspension.
Online since: November 2013
Authors: Yukitaka Murakami, Hisao Matsunaga, Junichiro Yamabe
Second, detailed studies that have quantified the influence of hydrogen on fatigue crack growth behaviour, based on microscopic observations are very rare; most studies have only examined the influence of hydrogen on tensile properties.
From the term “HE”, we assumed that the higher the H-content in a material, the lower the strength properties of the material as shown in the previous section [7].
Fig. 14 Size of the hydrogen- affected fatigue crack growth zone (HAFCG zone) of a high- strength steel (HV = 568), SAE 52100 [14].
The values of KTH for both the nonmetallic inclusions and artificial defects were definitely smaller than those for the large cracks, though the effect of some influencing factors, e.g., material type, strength level, hydrogen content, strain rate etc., should further be clarified in the future.
The threshold intensity factor KTH decreased with a decrease in defect size in the small crack regime.
Online since: October 2006
Authors: Gerard Vignoles, Alexandre Velhinho, L.A. Rocha, Francisco Manuel Braz Fernandes, P. Cloetens, S.C. Ferreira
Examples are provided concerning the characterization of the reinforcement population, interfacial properties, in-situ transformation and damage evolution.
Firstly, the presence of reinforcing particles is directly implied on the local mechanical properties, with reflection on the overall properties of the composite.
Interfacial characterization The matrix/reinforcement interface plays a decisive role in determining several properties and behaviours of MMCs.
Furthermore, its replacement by other types of interface (gas/ceramic, ceramic/ceramic) often denotes the occurrence of material defects, arising from processing problems and resulting in degraded properties.
These gains reach a factor of ~9 when processing a 100 × 100 × 100 voxel dataset from an Al/SiCp FGMMC tomograph (each voxel being a 0.95 3 μm 3 cube), even if, as could be expected, a 64 × increase in the volume of the dataset causes the processing time to increase by a factor of ~73.
Online since: June 2013
Authors: Zhi Wei Guan, Guang Hui Yan, Shao Hua Wang, Chen Fu Liu
Active suspension control unit will appear a series of time-delay factor in the control loop.
The pavement vertical disturbance need to be monitored by preview sensor and estimated by Kalman Filter. 2.2 PID Control of Active Suspension If the is smaller then the ride comfort and comfort properties of vehicle is better.
-4.33,4.15) 0.5140 1.3017 passive suspension (-0.62,0.76) (-4.41,4.32) 0.3017 1.1175 By analysis to Fig.2, Fig.3 and Table 2 we can get the results: 1) With the system time-delay increases the amplitude range and root mean square value of sprung mass vertical acceleration are gradually increasing. 2) Take the critical time-delay τ=0.153s to do simulation test, and compared with PID control which has no time-delay, the system amplitude increased 1.2 time or so, but the appearing moment of wave crest and trough is almost invariant, the active suspension is in critical stability. 3) Take the critical time-delay τ=0.18s to do simulation test, and compared with PID control which has no time-delay, the amplitude of sprung mass vertical acceleration increased dramatically 2.5 times, and the appearing moment of wave crest and trough have reverse chaos, which shows that the system appear unstable chaotic vibration state.. 4) The total time-delay value of active suspension system is the key factors
which affect the integral control effect. 5 Conclusion 1) According to the theory of linear ordinary differential equation which contains time-delay and according to the Routh-Hurwitz stability criterion the system stable conditions directly related to the parameters,,,and,,.
Vehicle active suspension system using skyhook adaptive neuro active force control [J].Mechanical systems and signal processing 2009(23): 855–868
Online since: January 2013
Authors: Xu Xie, Yong Gang Shen, Gang Wang
Such damage affects the safety of the bridge and can cause water infringement and other defects, directly shortening the service life of the structure.
Wang [1] performed a destructive test on a prestressed concrete slab bridge and reached the conclusion that the failure of concrete hinge joints was the major factor which led to the loss of structural integrity.
The analyses showed the less influence of the hinge concrete strength on the integral loading properties of bridge but the reduction of hinge concrete strength will decrease its tensile capacity and thus lead to the cracks along hinge joints.
Therefore, the value of the film’s elastic modulus directly affects the lateral load distribution of the bridge.
A comparison between the measured results and the model values shows that when the elastic modulus value of the film is approximately 0.75MPa, the force and deformation characteristics obtained by the model calculation are near the measured results, indicating that the results of the model may reflect the mechanical properties of the bridge.
Online since: June 2014
Authors: Hai Fang Wang
The aim of coiling temperature control is to make hot rolled strip from high finishing roll temperature to requested coiling temperature, which makes strip obtain satisfactory microstructure performance and mechanical property [1,2].
The cooling capacity of each set of cooling pipes is same, the cooling conditions of up and down plate is same, the affect of phase changes heat on the plate coiling temperature is neglected, and its related heat conduction and radiation among the roll is neglected too.
(6) Self-learning model For improving the control accuracy, a self-learning factor A0 is joined into the model, and the self-learning model is built as following
(8) Where N' is the measured value, β is a correction factor, 0 <β<1,and it takes 0.3 to 0.7 generally.
Online since: May 2011
Authors: Wei Zhang, Ming Yi Zhang, Hai Lei Kou
Introduction Squeezed branch pile is a new-type concrete caisson pile appeared in recent years, and pressed multi-branch pile is a new type with better efficiency of construction and better mechanical property based on the pile.
(4) Don't consider the construction factors impact on the soil around the pile; The existence of the pile does not affect soil index.
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