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The results show that: the shaft torsional vibration and bending vibration have happened when the hybrid system is running, and the engine cylinder pressure change was the main factor which caused the shaft vibration.
A new incentive and restraint were added to the shaft system of the power system, and its mechanical structure was changed.
Thus, the body's power and vibration characteristics have been affected.
Shaft Vibration Modeling Methods The dynamics characteristics of shaft system not only related to the property of the shaft, but also to the incentive and the constraint of the shaft system.
Motor Model In the coaxial parallel hybird system, the diesel engine connected motor with coaxial mechanical structure.

Forging can improve the mechanical properties of a material and can be classified as cold forging, warm forging, or hot forging.
Because of plastic deformation during the formation process, cold forging results in higher hardness than warm or hot forging; hardness affects the forgability and mechanical properties of the component.
A reasonable forging flow line is critical to obtaining high mechanical strength.
The level nominal-the-best SNR of each experimental factor was mapped onto an SNR factor response diagram, which is displayed in Fig. 10.
SNR factor response diagram.

Test Description 13 T- and 11 L-shaped columns are designed, and then the mechanical properties of the concrete and reinforcment are measured,and they are shown in Table 1 and Table 2.
Tab.1 The mechanical properties of concrete （MPa) （MPa) （MPa) （MPa) 28.0 26.62 17.81 2.11 Tab.2 The mechanical properties of reinforcment diameter（mm) yield trength(MPa) tensile strength (MPa) 14 386.8 584.0 16 322.7 495.4 In the table 1,is the test value of cube compressive strength; is the standard cube compressive strength; is the axial compressive strength; is the tensile strength.
The pros and cons ductility factors are small, so the shear failure of broad-limb special-shaped columns should be avoided in seismic design.
It is shown that the shear capacities of special-shaped columns are affected by loading angles obviously from the test in this paper on broad-limb special-shaped columns with different loading angles.
Formula for calculating shear capacity Since there are many shear failure influencing factors of special-shaped columns, and the failure mechanism is complex, there is no calculation method on complete mechanical theory at present, the calculation of shear capacity adopts semi-theoretical and semi-empirical formula.

MK (Al2Si2O7, or AS2), is a supplementary cementitious material with pozzolanic properties obtained by calcination of clay with high kaolinite (Al2Si2O7·2H2O) content at temperature between 500 °C - 800 °C.
The properties of MK as a pozzolanic material have been reported previously [6, 7, 8].
Properties of metakaolin are given in Table 2.
Excluding the role of temperature, a concentration of reactive Al2O3 from clinker and metakaolin together with size of particles are main factors affecting initial reactions.
Nevertheless other factors are also important.

Obtaining the metallic materials route metallurgy powder, the sintering process is preponderant in the final properties of material.
The experimental methodology of Taguchi bases on three variables types that affect every process and in consequence the variable answer, being them: (1) control factors, (2) sign factors; that can be controlled by operator and they affect the medium value of the answer and (3) factors of noises, that not controlled (environmental) and that affect the variable answer [1].
Table 1 - Factors and levels.
Factors Q.A.F F.D.
Factors Q.A.F F.D.

Study on Tribological Property of Nano-Tio2 Additive Oil-in-Water Lubricant during Hot Rolling Wenzhen Xia1, a, Jingwei Zhao1, b, Hui Wu1, c, Sihai Jiao2, d and Zhengyi Jiang1, e * 1 School of Mechanical, Materials and Mechatronic Engineering, University of Wollongong, NSW 2522, Australia 2 Baosteel Research Institute (R&D Centre), Baoshan Iron & Steel Co., Ltd., Shanghai 200431, China awx717@uowmail.edu.au, bjwzhaocn@gmail.com, chw944@uowmail.edu.au, dshjiao@baosteel.com, ejiang@uow.edu.au.
Oxide scale formed on the steel surface during hot rolling affects the tribological property of nano-TiO2 additive oil-in-water (O/W) lubricant, resulting in changes of roll forces, torques and power consumption, as well as the wear and the surface quality of the work roll and workpiece in hot rolling.
The oxide scale inevitably forms on the surface of the workpiece and affects the tribological property of the contact interface between the work roll and workpiece [6].
Yoshida, Influence of lubricant factors on coefficient of friction and clarification of lubrication mechanism in hot rolling, Tetsu to Hagane. 93 (2007) 681-6
Wen, The tribological properties of oils added with diamond nano-particles, Tribol T. 44 (2001) 494-8

Zhang et al [9-10] studied the composition optimization and mechanical properties of Al-Mg-Si cast alloys.
Table 1 shows the factors and levels of the orthogonal test (five factors and three levels), while Table 2 illustrates the optimized chemical composition of the investigated alloys.
The initiation produce of cracking was affected by strength of material.
These factors resulted that the OA alloy had better thermal fatigue behavior than that of ZL101 alloy.
These factors resulted that the thermal fatigue resistance of OA alloy was superior to that of ZL101 alloy.

Thus, rock mechanical properties change attributed to the formation temperature and overburdened pressure as the rock deepens in the well.
Coupled formation temperature and overburden pressure lead to great alteration of rock mechanical properties in deep formation [6].
The main rock mechanical characteristic parameters affecting the rock penetration of bit are compressive strength, shear strength, elasticity modulus, Poisson’s ratio, internal cohesion and internal friction angle.
It reflects the influence of other factors on ROP.
In case of broken teeth, the performance is affected.

Polymer-based biomedical piezoelectric composites have shown excellent results in laboratory research from aspects of their flexibility and possibility to tailor their electro-mechanical properties.
These models provide relationships between the microstructure (ratios of phases or their interactions) and macroscopic electro-mechanical and elastic properties.
COMSOL multiphysics models have been used for evaluation of porosity influence on electro-mechanical properties.
Therefore, modeling and simulation for finding optimal materials and processing parameters can significantly shorten traditional trial-and-error experimental approaches, especially in the case of hybrid composites like electrospun PVDF/AgNPs where multiple factors determine whether the produced fibres would exhibit piezoelectric properties or not [9].
Further studies of influential factors for mitigation of signal noise are needed, considering composite properties.

It has good process performance, good comprehensive mechanical properties and low price, but it has poor hardenability and is prone to insufficient toughness.
After the rotor is cracked, it affects the stiffness and critical speed of the rotor, which in turn affects the vibration characteristics of the rotor.
The heat treatment process is to heat the metal in the corresponding medium and cool it in different media to realize the process of changing the properties of the metal.
When the metal is affected by any factor, its performance will change to meet the needs of engineering production.
During the cutting process, due to factors such as cutting conditions, metal and processed materials, products with different finishes are produced.