Search results

In this method, firstly, we analyses the effect of uncertain factors in design variables and design parameters on the objective function and constraints, then calculate maximum variations of objective function and constraints.
One serious problem in these systems is the inconsistent performance due to uncontrollable variation existing in the real-world, including manufacturing operations, variations in material properties and the operating environment[1].
Spindle is one of the important parts of machine tool, its performance directly affects the machine tool's efficiency and longevity[7].A simplified machine tool spindle is shown in Fig.1.
As can be seen from table.1,because traditional method doesn't consider the effect of uncertain factors on objective function and constraint conditions, Its optimization solution are better than other three methods.
Zhang: Ronustness of design through minimum sensitivity, Journal of Mechanical Design, Vol.114 (1992), p.213-217

Flow field analysis and optimization scheme For separation process two-phase flow, the improtant factor are interactions of mass, momentum and energy between two phase.
When this situation happened, the separation efficiency will certainly be greatly affected, and the micro-bubbles will increase the difficulty of the second separator and ultimately affect the whole system performance[5].
Owing to the separation system has a wide range of adaptation, it also can apply to degass in the complex structure wells or dirlling process in situation that some related properties unclear.
The paper assumed that the variable factors of mixture are independent and have no influence each other, this is not absolute with the actual situation; further in-depth study should consider the mutual influence of various factors to make simulate conditions closer to the actual situation.
Mechanical Engineer.

Comparatively, zirconia has mechanical and biological properties that are similar to those of titanium [11].
b a Figure 2. a) Case 2: Periodontal disease affecting inferior incisors; b) Case 2: High bone loss between 4.3 and 4.2.
While the implants made entirely of zirconia are capable of withstanding simulated long-term loads, the mechanical properties of zirconium seem to be influenced largely by the mechanical preparation of the material [9, 10, 13, 17, 18].
This was due to healing enhanced by the growth factors.
Conclusions The case-studies presented in this paper demonstrated that PRGP factors enhanced bone and tissue healing in post-extraction alveoli.

To improve electrical and mechanical properties, combine carbon nanotubes with insulating polymers [9].
It has good chemical resistance, adhesion, heat and electrical resistance, low shrinkage, and mechanical properties, including strength and hardness [12].
Adding fillers may enhance mechanical and physical properties [14].
The thickness of the composite is one of the important factors that affect the permittivity of the samples in this study.
Agarwal, “A study of mechanical properties of epoxy resin in presence of different hardeners,” Technol.

As an example of achieving sufficiently high physical and technical properties of composite materials one can refer to powder-activated concretes [9, 10, 11, 12, 13, 14].
This structure can appear in case of certain spatial difficulties and other factors that affect the crystallization.
The disintegration of solid solutions being a phase transformation, is one of the most effective ways to influence the structure and properties of cement stone.
The resulting superstructure has significantly different properties than a solid solution with a statistically ordered structure.
Tuvin, Structure, composition and properties of geopolymers from mineral wool wast, Journal of Civil Engineering. 90(6) (2019) 3-14

Defect influence on the electrical properties of 4H-SiC Schottky diodes L.Scaltrito 1,2, E.
We report on the defect influence on the electrical properties of 4H-SiC Schottky diodes.
The devices were fabricated on a n-type epilayer treated by chemical mechanical polishing.
A surface treatment by chemical mechanical polishing (CMP) was done by Novasic to reduce the surface defects density.
The most important results is that the presence of micropipes does not affect the electrical behavior of the devices, which could be ascribable to a partly filling.

Different laser parameters and the interactional production can affect the barcode grade profoundly.
He found that contrast and print growth factors limited the laser mark achieving a higher grade.
The important factors often being investigated include laser parameters (e.g., frequency, power, and scanning speed) and properties of the substrate (e.g., materials chemical composition).
It can get the deeply understanding and knowledge about the connection among laser parameters and substrate properties with barcode quality.
Li: Metal Metallographic Map (Mechanical Industry Press, Beijing 2006) , In Chinese

The main factors that affect the performance of a cutting too should include [5]: good wear resistance, high strength and toughness, high hot hardness, good thermal shock properties, and adequate chemical stability at elevated temperatures.
Special mechanical properties at high temperature cause difficulties in machining.
Typically, the main factors affecting tool wear cutting speed, feed rate and cutting depth.
This experiment researches on the cutting speed that affect the tool wear seriously, by using three cemented carbide cutting tools whose coating materials are different.
T's index is 0.3906 in the T-v formula of T C7 PLUS nano-composite coatings carbide tools.It shows that C7 PLUS nano-composite coatings are less affected by cutting speed.

The mechanical property of PP and the composites studied by using universal testing machine show that both mass fraction of vermiculite and particle size have consequences for mechanical property of PP, and when mass fraction of vermiculite and ball-mill 5 hours can acquire good mechanical properties.
So 5 hours of ball-milling [most particle diameter is around 2.796μm] is good enough to achieve good mechanical properties.
Photos of polarizing optical microscope at 100°C Conclusions The mechanical and thermal properties as well as the morphology of the PP composited with expended vermiculite of different contain and different particle sizes were studied.
The mechanical properties studied show that there is a positive correlation between strength and degree of crystallization, as well as stiffness and crystalline size.
The results obtained from non-isothermal crystallization studies reveal that the expended vermiculite particle size is the key factor to influence crystallization properties.

Correlation analysis revealed that the dependence of microhardness on the factors under study is strong – the multiple correlation coefficient reaches value 0.999.
It describes the dependence of microhardness on the factors under study, which has the following form: Hμ=8087,7Ra-0,07 (3) Analysis of the obtained nonlinear regression dependence made it possible to reveal the value of the multiple correlation coefficient, which reaches the value 0.995.
Moscow: Mechanical engineering, 2003
Dispersion-hardened composite coatings with desired physical and mechanical properties.
Mechanical, operational and technological properties of electroplated coatings.