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Finite Element Analysis and Experimental Study for MWD Hybrid Excitation Generator Du Xiao1, a, Li Desheng1, b, Lin Enhuai1, College of Mechanical Engineering and Applied Electronics Technology Beijing University of Technology 1NO.100 Pingleyuan, Chaoyang District, Beijing, China,100124 aduxiao.63@163.com, bdsli@bjut.edu.cn Key word: MWD; Hybrid excitation generator; FEM; Experimental Abstract: To obtain the stable output voltage, a new type of MWD hybrid excitation generator is designed in which magnetic flux can be regulated from -2% to 22%.
In this hybrid excitation section, the permanent magnetic circuit through shaft and shell (called axial flux) was affected by the length of magnet pole.
These analyses addressed that length of iron pole and area of shaft was key factors and they affected the magnetic circuit distribution and regulation characteristics.
Literature References [1] Wang Zhiming, Guo Yun, Shang Jie: Design and experimental study for MWD hybrid excitation machine, china petroleum machinery. (2011) [2] Shen Yue, Su Yinao, Li Lin, Li Gensheng: Operating property analysis of MWD permanent magnet synchronous generator, china petroleum machinery. (2008) [3] Zhao Chaohui, Zhang Zhuoran, Qin Haio: The structure and principle of the hybrid excitation motor. (2010) [4] Zou Jibin, Fu Xinghe.

Due to the johnson-cook model is widely used than other one, so it is also used to characterize the mechanical properties of tc4 titanium alloy.
The density of mesh is a factor affecting the results of the calculation.
Chinese Mechanical Engineering. 13 (2002) 1938-1940
China Mechanical Engineering. 17 (2006) 1813-1816

The crystallite size and a particular size effect on the desorption properties of nanostructured MgH2, synthesized by controlled reactive mechanical milling in a magneto-mill, is shown in Fig. 5 [22].
It was concluded that two factors (the refined powder particle size and the γ-MgH2 phase presence) are responsible for a substantial change in desorption properties of MgH2.
It seems that the crystallite size is not affected by the DSC desorption temperatures.
However, there is an additional factor, i.e. the different thickness of oxide film on hydride particles, which can change the desorption properties leveling the role of crystallite size.
Basic Properties (Eds.

Principal factors of influence.
By these contrast tests, he concluded that the process was not really affected by these two factors.
Principal influence factors.
Separation method and product properties.
He also studied the properties of solid, liquid and gas fractions.

Mechanical Properties: In the case of structural materials, strength, ductility, fracture and creep under static loading, deformation and properties under dynamic impact and cyclic loading are some of the most important mechanical properties.
Obviously, these mechanical properties of bulk NS materials should be known before their industrial applications.
Fatigue Properties: NC metals and alloys have many potential applications in cyclic loading condition.
Twenty papers from eleven countries were collected in this special topic volume and covered a wide range of issues related to mechanical properties and deformation mechanisms of bulk NS materials.
These papers provide basic and fundamental understanding and knowledge on the mechanical properties and deformation mechanisms of bulk NS materials.

The result from finite element analysis shows that the maximum stress is less than the material’s strength with safety factor of 1.1.
The drop height for the dynamic drop test is affected by the vertical velocity of the aircraft before landing.
The plywood and the woven fiberglass layer are considered to be isotropic on its plane due to the same properties in each direction [5].
Material properties are assumed to be isotropic according to materials selection process.
It can be seen that safety factor of this fuselage is 1.1 and the mass of the fuselage is found to be 0.813kg.

The results obtained showed that good correlations between print quality characteristics and surface energy as well as topographic properties can be obtained.
In order to achieve the pretended goal, is critical to know how they influence paper coated properties.
Print quality properties and surface chemistry.
There is a very good negative correlation between these two properties proving that for achieving high colour print quality levels, peaks and valleys must be evaluated with particular emphasis.
Pigment particle shape, as well as consideration about surface chemistry of coated papers, is the main factors that may explain this fact.

On the other hand, Abdullah et al. evaluated the grain size and grain aspect ratio of the solder joint’s to investigate the relationship of mechanical properties, micromechanical properties and the microstructure of SAC305 lead-free solder wires [7].
This will enhance the understanding of the evolution of microstructure and its effect to other chemical, electrical, and mechanical properties of solar PV module. 7.
Chun Yan, Interfacial microstructure evolution and mechanical properties of Al/Sn joints by ultrasonic-assisted soldering, Trans.
Ambak, Relationship of mechanical and micromechanical properties with microstructural evolution of Sn-3.0Ag-0.5Cu (SAC305) solder wire under varied tensile strain rates and temperatures, J.
Zhong, A review of the influencing factors on anisotropic conductive adhesives joining technology in electrical applications, J. 

The microstructure of fusion zone and heat affected zone is shown in Fig. 3.
Heat affected zone microstructure Liquation cracking is shown in the heat affected zone (Fig. 5).
Liquation in heat affected zone 3.3.
Knowing that the creation of large fusion area may result in reducing the mechanical properties of the weld, the use of high voltages is not recommended.
Penetration depth of weld pool is determined by heat power density factor.

The relative position of antenna elements will change because of the mechanical vibration of ship deck, which will dead to the difference of the wave path and result in the variation of scanning beam pointing direction.
All of that will affect the guiding performance and accuracy, and more seriously, shipborne MLS could not work.
Considering that, each element of the linear array is basically the same, the synthetic field intensity of elements can be approximated to (2) Considering, we can remove the constant factor of (2), and then (3) Figure 1 The position of element k Figure 2 The geometry of the element’s position error Visible, the array antenna pattern is the product of element antenna pattern and the array factor associated with the geometry of the array.
(7) According to the properties of sinc function, the direction of beam can be changed by controlling the phase, and the direction of beam can be expressed as (8) And that is to say, a scanning beam can be obtained by controlling the phase of each phase shifter. 2.2 The model of Antenna array’s vibration error The position of antenna elements shifts because of antenna array’s vibration, as shown in Figure 2.
Figure 3 Vibration modes of antenna element 3 Analysis of antenna’s vibration effects on the guiding performance of Shipborne MLS 3.1 Analysis of the influence of vibration component in the X-axis on guiding performance According to the vibration mode, the vibration amplitude in the X-axis can directly affect the scanning beam, and the received signal wave in azimuths of -60°，0°，60°is shown in figure 4.