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Vibration Performance Analysis on Gear Systems FANG Lei1,a, LI Jinfang1,b, SI Lili1,c Department of Machine Engineering, Naval Petty Officer Academy, Bengbu, China 21780343@qq.com, 615959987@qq.com, silili24@163.com Keywords: Gear transmission, Gear system, Dynamic properties, Vibration Performance Abstract.
The dynamic properties of gear transmission include the dynamic load of gear transmission system, the mechanism of vibration and noise, computing and control, which are the main directions of the future research.
Due to gear transmission unavoidably produce dynamic load under actual operating conditions [3,4], in order to ensure reliable transmission performance, dynamic load and excitation factors must be determined accurately.
As an flexible mechanical system, gear transmission systems inevitably generate dynamic responses under dynamic excitations, thus the primary issue in studying fundamental principles of dynamic excitations of gear mesh process and determining types and properties of dynamic excitations is to study the dynamic responses of gear transmission systems.
In order to design gear transmission systems with good dynamic behavior and low noise, people have done quite a lot of theoretical calculation and experimental researches on factors affect dynamic behavior of gear transmission systems.

Comparison of the Mechanical Properties of Hastelloy X Material after Welding by GTAW and Nd-YAG Laser Shih-jeh Wu 1 , Chao-Wei Du and Chen-Ming Kuo 2 Department of Mechanical and Automation Engineering I-Shou University 1 Section 1, Hsueh-Cheng Rd.; Ta-Hsu, Kaohsiung 84008, Taiwan Email: 1wsj007@isu.edu.tw, 2cmkuo@isu.edu.tw Keywords: Gas Tungsten Arc Welding (GTAW), Nd-YAG laser welding, Hastelloy X, Tensile Property Testing, X-ray diffraction.
The superior properties at high temperature (e.g. creep resistance, corrosion resistance, and thermal fatigue) have consistently improved the performance of aircraft engines.
Weld quality is a function of many factors: the type and quality of metal deposited, the heat treatment inevitably experienced by deposited metal and by the parent metal around the weld (the Heat-Affected Zone), and the residual stresses left in both the parent and deposited metal.
Temperature and temperature distributions affect expansion and contraction and the relationship between stress and strain and thus, residual stresses.
In this study, we study the mechanical properties of the Hastelloy X alloy under two different welding methods i.e., GTAW (Gas Tungsten Arc Welding) and Nd-YAG Laser.

In POSS modified polymers there could be the two competitive factors to determine the Tg of materials.
Figure 5 show the thermal properties of the pure EP-CE and the EP-CE/POSS nanocomposites.
Viscoelastic properties of composites.
Therefore, the addtive of POSS improves the mechanical properties above their Tg's, raising the heat distortion temperature.
Thus, POSS additives can improve the thermal stability and the high-temperature mechanical properties of epoxy-cyanate ester resins.

The new low-alloy cast steel has the ideal metallographic microstructure, proper physical and mechanical properties.
For a brake disc, both the temperature and thermal stress are main factors of the brake disc design criterion, which directly affects on the brake disc life.
Different materials will have different physical and mechanical properties.
Mechanical property indexes at room temperature Tensile strength (MPa) Yield strength (MPa) Hardness (HRC) Elongation (%) ≥ 1020 ≥ 950 32～37 4～12 2.2 Determining the Chemical Composition Chemical composition will not only affect the material mechanical properties, but also be one of the major factors that determine the kind of metallographical feature and the result of heat treatment at the same time.
The mechanical properties of the cast steel can be achieved with the similar level as those of forged steel.

Generally, reinforcement of the matrix results in increase of mechanical and development properties.
Mechanical properties of Particulate AMCs are higher than unreinforced aluminum alloys.
Porosity has the major role in fracture processes and also has its effect on various mechanical properties like hardness, compression test and thermal conductivity.
In the present work, the results obtained using taguchi method reveals that 6 wt % of alumina has better performance on burr height and remains without affecting the mechanical properties of the composite material with all cutting conditions.
Marashia, Preparation and mechanical properties of SiC-reinforced Al6061composite by mechanical alloying, Mater.

The mechanical properties of welded joint was studied by tensile test and the morphology of tensile fracture, microstructure as well ingredient of welded joint were observed by SEM.
There is no evident heat affect zone in the weld seams；The mechanical properties of welded joint are worse than those of matrix metal.
Introduction Magnesium matrix composites have gained increasing attention for applications requiring high strength, stiffness and particular thermal properties.
Fig.2 Microstuctures of welds of SiCp/ZC71 magnesium matrix composite (a)fusion boundary zone; (b)welded seam zone Mechanical properties of welded joints.Table 1 shows the results of the tensile test, the tensile strength of welded joint is not high, fracture occurred in the welded seam.
Table 1 Mechanical properties of joint Location of fractures happened Tensile strength（MPa） Percentage elongation (％) welded seam 80.6 1.9 Fig.3 Morphologies of tensile fracture surface of the sample Microhardness distribution of welded joints.The distribution of micro-hardness along the depth of bond zone, heat affected zone and the substrate of the welded seam zone, as shown in Fig.4.

The ratio of amylose and amylopectin also affects the thickness of the bioplastic and the thickness usually associated with permeability, optical and mechanical properties [27].
Blend starch improves water resistance, processing properties and mechanical properties [10].
Mechanical properties are regarded as the main physical properties of polymer.
Water absorption is major factor for evaluation of biodegradable properties of polymer.
Bowyer, Starch based film: Major factors affecting their properties, International Journal of Biological Macromolecules 132 (2019) 1079-1089

Additional material properties and clamping conditions are required for the mechanical analysis.
The effect of the metallurgical history on the mechanical analysis includes four factors [2].
The first factor is the influence of the metallurgical structure on the mechanical properties.
The mechanical material properties for the initial phase are given in Tables 3 to 6.
Slow weld Fast weld Length [mm] 8 5 Width [mm] 10 11 Penetration [mm] 3 2.5 Table 3 Thermal and mechanical properties [3].

Study on Support Properties of Axial Maglev Blood Pump Huanchun Wu a, Ziyan Wang b, Yefa Hu c School of Mechanical and Electronic Engineering, Wuhan University of Technology, China a whc@whut.edu.cn, b huanchen_1987@yeah.net, c huyefa@whut.edu.cn Keywords: Maglev, Axial Flow, Blood Pump, Support Properties Abstract.
Based on finite element method, magnetic flux of axial magnetic bearing, radial magnetic bearing and test rig are analyzed; at the same time, the structure parameters and mechanical properties and the coupling of radial MB and axial MB are studied.
The results show that: rotor displacement of axial bearing and radial bearing will affect load capacity and stiffness.
However, the bearing properties of the maglev heart pump is not clear, which has limited its applications.
Magnetic Field Analyses Because of the exists of non-linear magnetic permeability, magnetic saturation, magnetic flux leakage, magnetic coupling, eddy current and other factors, the electromagnetic field of magnetic bearings has a strong non-linear and dynamic characteristics.

Since the discovery of high-temperature superconductivity of cuprate oxides, it has been clear that it is strongly affected by the oxygen content, which is also a crucial factor to determine other physical properties of high Tc superconductors.
Non-stoichiometric (interstitial) oxygen strongly influences the physical properties of various superconducting oxides, in particular by creating conducting holes.
The oxygen content is a crucial factor to determine the superconducting and other physical properties in SBCO high Tc superconductors.
The possible role of the interstitial oxygen in the determination of the structural and magnetic properties of the 2212 oxides is not generally considered.
Gremaud: Mechanical Spectroscopy (Trans Tech Publications, Zurich, 2001)