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Introduction The mechanical fault caused by the damage of rolling bearing counts for a large proportion in rotating mechanical faults.
(2) Where, is a scale stretching factor, and is a time shifting factor;.
(3) Wavelet transform has a unique time-frequency property, which depends on the two continuous variation parameters on the real area, i.e., and.
Among them, time shifting factor only affects the position window in the frequency shift, while the scale stretching factor not only affects the position window in the frequency shift, but also the shape window.
Mechanical Engineering & Automation. 6(2010)123-124

In order to understand the relationship between the tensile property and the blended ratio of SP-PVA/combed cotton blended yarn, the tensile properties of SP-PVA/combed cotton blended yarn with different blended ratio were measured.
Introduction Many researchers pay attention to the mechanical property of the blended yarn.
The pure cotton yarn, the pure SP-PVA yarn and the blended yarn are of 18tex and 320 twist factor.
This results from the mechanical property of the fibers.
Although the fibers are blended and twisted with each other in forming the yarn, this does not affect or change the facts of the non-matching due to the difference of the mechanical property of the blended fibers.

The mechanical property of the steels used for steel structure works plays a pivotal role in ensuring the safety of steel structure, and is always inspected by the client and relevant quality supervision department when inspecting and identifying the existing steel structure works in order to determine steel grade.
Each grinded area of the specimen shall be tested for once. 2.3.3 Sample from specimens The samples for tensile test shall be selected from the specimens which have been made with hardness inspection according to Position of Test Sampling of Mechanical Property and Specimen Preparation of Steels and Steel Products GB/T 2975-1998.
Reference: [1]National standard Conversion of Hardness and Strength for Ferrous Metal GB/T 1172-1999, China Standards Press, July 1999; [2] Duan Xiangsheng, Di Xiaotan, et al, Experimental Study on the Conversion of Leeb Hardness and Tensile Strength of Steels, architectural science, June 2003; [3] Zhang Hengyan, Lian Enchang, et al, Discussion on the Factors Affecting Measurement Precision of Leeb Hardness Meter, experience and society, No. 2, 2010; [4] Yang Dejian, Factors Affecting Measurement Precision of Portable Leeb Hardness Meter, measurement and test technology, March 2014.

Zuo 1.c 1 College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, China, 210016 a fxli@nuaa.edu.cn, bchenjindong1982@126.com, cdwzuo@nuaa.edu.cn Keywords: Landing gear, Forestay bar, Size optimization, Fatigue life Abstract.
That is, material property of the forestay bar is utilized more than before, and its weight decreased successfully.
Its fatigue life will affect the service performance of the landing gear directly.
The ultimate tensile strength of a forestay bar made of 30CrMnSiNi2A is 1600MPa, so material property of the forestay bar is utilized more than before.
According to the simulation of the optimized forestay bar, the stress is 929MPa, and the fatigue life is 51200 times, which satisfy the demands from its material property and the nose landing gear.

The chemical composition and mechanical properties of TMCP steel used are shown in Tables 1 and 2 respectively.
It has been recognized that the fatigue strength of steel in a corrosion environment is significantly affected by the fatigue loading speed.
In addition, it is known that the sea wave period is 6~10cpm Table 1 Mechanical properties of TMCP steel Table 2 Chemical composition of TMCP steel Plate used plate used Fig. 1 Shape of CCT fatigue test specimen Fig. 2 Shape of CT fatigue test specimen [2], accordingly in this research, the loading speed of fatigue test was set at 10cpm which may be equivalent to the sea wave period.
That means that other factors, for example, the formation of the rust, electrocoating, stress concentration of the pit at 11 01 0 0 ∆K (MPa m ) 10-9 10-8 10-7 10-6 10-5 da/dN (m/cycle) 1/2.
Fujimoto: Journal of The Society of Naval Architects of Japan, Vol.142 (1977), pp.239-250 [4] Stress Intensity Factors Handbook, Vol. 1, Pergamon Press (1987) [5] T.L.

Introduction Rock salt is a kind of soft rock, and it has excellent physical and mechanical properties of the low permeability and good self-healing ability which make it to be widely recognized as the ideal energy underground storage sites.
To numerical analysis, the influencing factors in salt formation containing the cavity shape, size, depth, and mechanical parameters have been accomplished, so was the optimal design parameters of the cavity for safe operation of gas storage in salt rock [2-4].
Based on these specific circumstances, the domestic scholars studied on the physical and mechanical properties of the layered rock salt, and got a systematic study of mechanical properties and solubility characteristics of rock salt in different conditions [5-6]; and proposed several damage model of interlayer collapse [7-11]; the preliminary studies on the influence about mudstone interlayer to cavity stability also be carried out.
During the construction process of underground energy storage, the concentration distribution is the key factor affecting the shape of the cavity, which impacts the dissolution rate of the rock salt.
Experimental research on acoustic and dissolved properties of stress damaged salt rock[J].

Among them, the factor that affects the maximum bonding strength of the material is the diameter of the cast steel shot.
Preparation and Tribological Properties of PES/Metal Self-lubricating Composite Materials[D].
Effect of Silane-modified Coconut Shell Powder on Surface Properties of Thermoplastic Elastomers and Its Application[J].
Press-sintering Forming and Properties of Metal Plastics Composites[J].
The effect of the ocean water immersion and UV ageing on the dynamic mechanical properties of the PPS/glass fiber composites[J].

Between these techniques, it is shown that FIT is arguably the most effective way to improve the mechanical properties.
However, in attaining a good mechanical property of the scaffold, porosity, pore size and pore interconnectivity is somewhat sacrificed.
Porosity (%)=Wc-WaWc-Wb×100% (1) Mechanical properties are significant factors to evaluate porous composite scaffolds.
Furthermore, HACAF and HABCAF also displayed homogenous microstructure and good interconnectivity, which are added plusses for scaffolding properties.
Conclusion The effects of processing composite coatings on the physical properties were studied.

The relation between glass surface tension and the content of Al2O3 conforms to the formula Y=290+6.5WAl2O3, Al2O3 factors influence the surface tension of the glass is 6.5.
High alkali aluminosilicate glass having excellent mechanical properties, particularly outstanding strength, hardness, toughness and scratch resistance, etc.
In addition, the high alkali aluminosilicate glass have good chemical stability and mechanical properties, so it show very good application prospects in the high-speed transport, new energy vehicles, solar - power industry and other aspects[3].
Create a neutral atmosphere to the sample to avoid surface tension changes affected by the atmosphere.
Use Bashforth-Adams table [11] can be found shape factor β.

Due to its mechanical and thermal properties, besides being easy to process, this type of resin is highlighted in the group of thermosets [1].
This combination has presented a wide potential in the improvement of properties and characteristics of the materials [4].
In the preparation of thermosetting composites, the POSS have been widely studied in obtaining hybrid materials which would be able to support higher temperatures [5], promoting an improvement in the mechanical and surface properties as, for example, polymer hydrophobicity [6].
These were mainly in reference to the addition of POSS to epoxy resin, reaching better mechanical properties such as impact and flexibility resistance, a higher thermoxidative resistance and a significant increase of glass transition temperature of the material [4,7].
Factors as free volume, coefficient of thermal expansion, forces of intermolecular interaction and degrees of freedom of conformation can affect the way polymer chains assume the equilibrium of molecular vibration [18,19].