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Its dynamic performance directly affects the accuracy of the geometry, and be the root cause of vibration, noise and temperature increase, etc.
It is a complex strong coupling system, including mechanical, electrical, magnetic, and thermal, etc.
Except the mechanical factors, such as rotor shaft concentricity, rigidity and rotor bearings jump, etc., the core effect come from motor torque control accuracy.
Meanwhile PWM frequency is also affected by the resource constraints of control system, higher PWM frequency needs higher resource at control system.
In the Motorized Spindle machining process, due to the different mechanical characteristics of the work piece and material properties, the Motorized Spindle need to work at the volatile states that torque and speed will change frequently, rather than work at a constant area.

(2) Overcoming shortcomings of each other, improving the properties of yarn.
Different fiber distributes differently on the cross –section of the yarn because of the different morphology and mechanical properties of fibers, thus the blending yarns have different look and performance.
Therefore, the natural fibers should be blended with finer and longer chemical fibers to get better hand, for example, when PET, bamboo fiber and cotton were blended, the hand and comfort of cotton , the good mechanical properties of PET and anti-bacteria properties of bamboo can be gotten when the PET and bamboo fiber is longer and finer than the cotton fiber[6]
Secondly, the blending ratio is one of the most important factors that affects the performance of the blending fabric.
Spinning ways affect the mechanical properties and look of the yarns, and the performance of the yarn is influenced by the spinning ways also.

Quartz crystal's advantages : stable piezoelectric properties, dielectric constant and piezoelectric coefficients not affected by temperature, good time and temperature stability ; high mechanical strength and high quality factor, good dynamic response, wide linear range, high natural frequency; no pyroelectricity, insulation and good reproducibility.
One is a piezoelectric semiconductor, such as ZnS, ZnO, ZnTe, CdTe, CdS, GaAs and so on, which has both piezoelectric properties and semiconductor characteristics.
Table 1 shows the comparison of some properties of several commonly used piezoelectric materials.
Mechanical properties: The piezoelectric elements act as stress components in the hope of its high strength and stiffness, in order to obtain a wide linear range and high natural vibration frequency.
Time stability: The piezoelectric properties are not transformed over time.

In these applications, porous tungsten matrix with homogeneous pore distribution and high open porosity are important factors to obtain uniform infiltrates distribution, which has a significant influence on the performance of targeted materials [6].
Table 1 Physical properties of raw materials and classified tungsten powder.
Analysis of Microstructure and Properties of W-Cu Composites.
Zhang, Thermal and electrical properties of Cu composite produced by activated sintering, Mater.
Research on the Mechanical properties and microstructure of W-Mo-Cu Composites[J].

Joints made of magnesium alloys should have at least the same properties as a finished casting.
The literature lacks information on the properties of joints welded of cast magnesium alloys.
Chemical composition and properties of the WE43 alloy Chemical composition of WE43 alloy [% mas.]
Kierzek, J.Adamiec: Design factors influencing weldability of the Mg-4Y-3RE Cast Magnesium Alloy, IOP Conf.
Rzychoń : Mechanical and creep properties of Mg-4Y-3RE and Mg-3Nd-1Gd magnesium alloy, Proc.

The minimum chip thickness effect is a major limiting factor on achievable accuracy because the generated surface roughness and significantly affects machining process performance in terms of cutting forces, tool wear, process stability, etc.
Weule et al. found that the minimum chip thickness depends primary on cutting edge radius, and secondarily on material properties, they concluded the workpiece material is removed by a shearing mechanism once the cutting thickness reaches an upper bound of a minimum chip thickness [5] .
Atkins argued the applicability of modern ductile fracture mechanics in modeling the cutting process and explained the dependence of shear angle on material properties by including a fracture toughness term in the energy expended in machining [8].
The stress intensity factor (KI) is the key parameter in the fracture mechanism, ductility fracture will happen when the stress intensity factor exceeds the fracture toughness (KC).
Since the KC is a material property that varies with the workpiece, the minimum chip thickness will vary with the workpiece material.

Determination of Optimal Temperature for Defect-free Casting of Aluminium in the LP-LFC Process Jiqiang LI1,a,Zhong ZHAO2,b, Zitian FAN3,c, Zhixin JIA1,d, Wen LIU1,e and Lijun LIU1,f 1 School of Mechanical and Energy, Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, P.R.
Foamed polymer patterns of the desired shape are embedded in unbonded sand and consolidation by mechanical vibration.
The filling velocity of melt is affected by many factors including filling temperature, thermal degradation of foam patterns, gas pressure in crucible, the property of coating, the degree of vacuum.
The net effect on fill rate is very minimal, so the amount of time for heat to be lost through conduction to the sand is not affected greatly.
First, as this experiment has shown, the minimal effect of metal temperature on fill rate requires a very large temperature increase to affect fluidity.

The filtering experiment showed that the filtration properties were better when the area density of PVA nanofibers is 2.5g/m2.
The mechanical strength of nanofibers is very low, which make they cannot be used for filtering and need to compound together with other carriers (base material).The sandwich structure purification material with glass fiber and industrial filter cloth as base material [1], PVA nanofibers as core material was prepared by using the hot pressing technology and its filtration properties were also tested.
Preparation of sandwich structure material and its filtration properties.
Taylor cone will form in the electrospinning process and the surface tension mainly affects the formation of Taylor cone.
Fig.8 The filtration efficiency and retention rate of fibers under different cycles Conclusions PVA has been taken seriously by people because of its superior physical and chemical properties as well as no pollution.

The laser parameters such as scanning speed and laser power, plays an important role on the morphological, mechanical and chemical characteristics of the deposited material.
These parameters also affect the morphological, mechanical and chemical characteristics of the deposited material.
The increases hardness for samples of group B can be attributed to two factors.
The other factor is attributed to the increased coating densification, promoted by the second irradiation cycle.
The laser deposition of coatings can be an alternative to the conventional methods, because the microstructural and hardness properties developed are promising to increase the coating lifetime during high-temperature operation.

The main properties of the wood-plastic composites Properties Data REMARKS Density (g/cm3) 1.1-1.5 Water absorption (%) <0.2 Soaked in water for 24h.
Guo, Process factors and performances of recycled plastic wood fiber composites, Journal of Beijing Forestry University 27 (2005) 1-5
Oksman, Mechanical properties and morphology of impact modified polypropylene wood flour composites, Applied Polymer Science, 67 (1998) 1503-1513
Raj, et. al, Effect of chemical treatment of fibers on the mechanical properties of polyethylene-wood fiber composites, Adhension Science Technology, 3 (1989) 55-64
[5] Wu J, et. al, Effects of fiber pretreatment condition on the interfacial strength and mechanical properties of wood fiber/PP composites, Applied Polymers Science, 76 (2000) 1000-1010