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Gearbox installation at altitude, within the narrow space top gear under the heavy load between super-normal speed, once appear fault, its maintenance and maintenance costs also is very difficult, so its demand of high reliability and service life is higher than general mechanical equipment requirements[2].
Gearbox Heat Analysis Fan impeller turns will pass kinetic energy through motor spindle to the gearbox, gear box gears, axis and bearing and produce driving friction heat, the faster the place generation more heat, so the quantity of heat of the gearbox temperature is imbalance, its steady heat transfer, the process has many factors.
Gear modelling accuracy will directly affect the accuracy of the finite element analysis results.
Definition gear surface for the load area, and the load type is Distribute Flux, value for heart for every square metre 2500 tile, convection and radiation environment temperature setting for 20 degrees Celsius, the definition chhilun material properties including convection and radiation characteristics, define the higher quality of the wide grid, get more accurate results of calculation, but also will greatly increase calculation time, so when the grid in points through the number of the control unit to obtain appropriate grid quality.
Gear box gears, bearings friction heat cause gear and bearing temperature trends, increased temperature cause thermal stress concentration, mechanical parts in heavy load, so the performance degradation under deformation will happen, even parts failure.

Analysis of Axial holding capability about the Lengthened shrink-fit holder and Cutting tool system LI JinTaoa, WANG ShuLinb, LI ZhuFengc, YU YongHuid,CHENG XueLiange School of Mechanical Engineering ,Jiangsu University, Zhenjiang ,Jiangsu 212013,China a478120809@qq.com , bwangsl@ujs.edu.cn , c18706101085@163.com ,d1042825077@qq.com , e1039148434@qq.com Keywords: lengthened shrink-fit holder, axial gripping rigidity, FEA, magnitude of interference Abstract.
Its gripping rigidity directly affects the quality of the processed parts and machining efficiency.
First of all use high-end integrated CAD/CAE/CAM software UG NX, as shown in Fig.2, building an assembly simplified model of lengthened shrink-fit holder, then start the NX Nastran’s static structure analysis module which has seamless integration with the UG NX, On the basis of automatic meshing, adjusting the entity unit size at the interface element, setting the physical property parameters of tool holder and cutting tool as shown in table1.The holder uses 40CrNiMoA which has excellent comprehensive mechanical properties and high resistance to tempering stability[7], cutting tool use cemented carbide with high bending strength.
Rigidity analysis of the matching of lengthened shrink-fit holder and cutting tool in high speed milling[J].Mechanical Strength,2009,31(1):88-94 [5]SONG ZhiPeng.
Cutting force in high speed milling[J].China Mechanical Engineering.2003,14(9):734-737

The microscopic models for predicting the physical properties of gradient materials are mainly divided into two types: linear model and nonlinear model.
The physical properties of Ti and TiC used in this paper are shown in Table 1.
Combined with the physical properties of the material, the finite element analysis of this paper is based on the theory of thermoelasticity, and the residual thermal stress distribution in the material is simulated.
According to the above analysis, it is shown that the introduction of the gradient layer can significantly moderate the thermal stress, and the higher the number of layers, the higher the thermal physical property matching degree between layers and layers, the lower the residual thermal stress, but when the gradient layer is more than 6 , The trend of reducing the residual stress is slowed down, in addition, the difficulty of the preparation and the economic factors are taken into account, so the optimal layer number is six.
Materials for Mechanical Engineering, 27(2) (2003) 14-16

The predominance of one of these properties affects the choice of the recorded electrical or magnetic component of the pulsed electromagnetic field generated during the MET in the rock destruction development.
The table shows significant differences between the magnetic and electrical properties of rock samples from the Tashtagol field.
Electric and magnetic properties of natural crystal structures of Tashtagol iron ore deposit [19-22] No.
Parkhomenko, Electrical properties of rocks, Publishing house Nauka, Moscow, 1965
Erofeev, Electrical properties of minerals and rocks, Publishing house TPU, Tomsk, 1994

The key technical problems are mechanical analysis of its structure and optimization of the design of truss structure.
Finally both practical and economical factor was chosen to meet the engineering truss structure.
During the time of project construction, according to the terrain, quantities, concrete properties and enterprise ability and so on to adopt different mode of transportation.
Finite Element Model Finite element model will affect the reliability of the results.

They improve the chemical and physical properties of the metal surfaces against corrosion and wear without altering the original properties of strength and toughness of the substrate [2].
ZrO2 is a well-known material that has excellent properties, such as high mechanical strength, chemical durability, and alkali resistance and can be used to protect chemically metal substrates from acid and oxidations [5].
The analysis of these results shows that the coatings affect both the cathodic and anodic branches of the curves [1,2].
The film is shown to act as a geometric blocking layer and increases the life-time of the substrate by a factor up to 5.8 at 40℃.
The film is shown to act as a geometric blocking layer and increases the lifetime of the substrate by a factor up to 5.8 at 40℃.

Cho et al[9] have studied the effectiveness of different types of silane treatments on the mechanical properties of kenaf fibers.
The have found that among the three silane coupling agents used, the most effective one for the property improvement was 3-glycidoxypropyltrimethoxy silane (GPS) when it was applied to the kenaf fibers at 0.5 wt% for surface treatment, resulted in the increased interfacial shear strength, flexural, tensile, and dynamic mechanical properties of the both kenaf/PP and kenaf/UPE composites.
Researchers have studied the effectiveness the single fiber pull out test and have found that there were various factors that needed to be controlled to achieve accurate results.
Effect of Fiber Surface Modification on the Interfacial and Mechanical Properties of Kenaf Fiber-Reinforced Thermoplastic and Thermosetting Polymer Composites.
Analysis of fibre structure modification during compounding and its influence on the final properties, Composite Interfaces, 2008, 15(2-3), 111-129, [17] Khalil, H.

In this paper, we propose a nonlinear control technique which is based on Flatness system properties for the voltage loop and a nonlinear control based on sliding-mode for the current loop.
The emissions of gases from the combustion not only cause air pollution, but affects human and leads to global warming.
To control this converter, instead of using a linear multiple-loop feedback control technique [3], we propose nonlinear control technique, which is based on Flatness system properties [4,5] for the voltage loop and a nonlinear control based on sliding-mode [6,7] for the current loop.
Fig 1. 2-Phase interleaved boost converter CONVERTER MODEL VIA FLATNESS SYSTEM Since 1995, Flatness system has been introduced in by Fliess [4]; its properties have been contributed to many applications even in mechanical or electrical domains [4].
The main advantage of the system controlled using flatness system properties is that the desired trajectories of the flat outputs can be planned even in transient state.

Constitutive Properties The constitutive properties of human brain have been the subject of much research within recent decades.
The mechanical properties of the brain and CSF will affect the pressure response of the brain.
Table 2 summarises the mechanical properties that were used in the subsequent analyses.
It used the same material properties of [53], which were also used by [22].
A hyperelastic material was used for the brain to maintain these properties, in conjunction with a viscoelastic material property, giving the material a decay factor of β = 145s-1.

The roughcast should be applied to the surface of the substrate layer to improve mortar bonding conditions, adherence to the substrate layer being one of the main properties required for a coating mortar in the hardened state.
There are several factors that can contribute to this behavioral failure, ranging from the design stage to the inadequate specification of materials, deficiency in application procedures, as well as inadequate operational procedures in use and maintenance.
The additives should aid in obtaining important properties in the fresh and hardened state, such as deformability, water retention etc.
Curing temperature and duration of wet curing are the key factors for proper curing since the rate of hydration depends on the ambient temperature in the presence of moisture, as well as depending on the quality and quantity of the cementitious materials present in the mixture.
This fact can be credited both to physical effects, due to the improvement in the rheological behavior of the mortar, and the chemical properties, due to the increase in the presence of calcium ions on the contact surface between the layers