Search results

Current studies at home and abroad are mainly focusing on aspects of its structural design, kinematics, dynamics analysis, except mechanical efficiency.
In this paper, combining kinematics and dynamics, some factors affecting the Friction Power Loss of a rotary engine are studied and discussed. 2 Introduction of the new rotary engine Object of this study is a new rotary engine, as shown in Fig 1, and the basic principles of the rotary engine, as described below.
Considering that, the rough surface of piston ring-cylinder liner would affect the lubrication properties of the piston ring, this paper adopts the average two-dimensional Reynolds equation [4,5]:
(7) Piston speed is represented by; lubricant viscosity is represented by; shear flow factor is represented by [5]; the time is represented by; nominal film thickness is represented by ; the pressure flow factor is represented by,[4]; represents a dimensionless factor; Integrated surface roughness is represented by,,and are RMS of cylinder liner and piston rings surface roughness. 3.4 The asperity contact model.
During the gas explosion and doing work, the film thickness reaches the minimum and the film pressure reaches the maximum, it’s due to many factors , such as the rising temperature and pressure generated by the gas explosion, the falling viscosity of lubricating oil and the decreasing piston velocity.

Features of the design and principle of the sensor included strain gages cause the presence of factors affecting the accuracy of measurements (Fig. 7).
Factors affecting the accuracy of measurements by strain gages During the experiments, a significant influence of the vibrations of the site, where the measuring sensor is located, on the measurement results was revealed.
Impact of other factors on the measurement error were also revealed, and their elimination is possible on further device study.
[12] Kovalenko, P., Perepelkina, S., Korakhanov, T., Investigation of tribological properties of friction pairs duralumin – fluoropolymer used for design and manufacturing of biomechatronic devices, Tribology in Industry, 2017, V. 39, №2, pp. 192-197
[13] Alekseev, V.P., Khaimovich, A.I., Testing criterion models of destruction of materials with different rheological properties under edge cutting machining, -Key Engineering Materials, 2015, V. 684, pp. 13-20

It is found that viscosity is the key material intrinsic factor affecting neck-down process of glass tube.
Given its good mechanical, thermal and chemical properties, especially low thermal expansion coefficient (≤3.5×10-6/K), which is favor to withstand large temperature difference, high borosilicate glass exhibits excellent potential for preparing glass pipe, widely used in the fields of aviation, aerospace, solar energy, instrument and lighting, and so on[1-3].
At present, the preparation of high borosilicate glass tube in China generally is the mechanical manufacturing method, but the key technical indicators of the domestic high borosilicate glass tube such as the apparent quality and dimensional accuracy are far from the foreign countries due to the limited manufacturing equipment and poor process maturity, which makes it not meet the requirements of high-tech applications.
As one of the key physical properties of glass, viscosity can directly reflect the structure of the melt, so it has always been a research hotspot of glass thermodynamics [4].
Therefore, it can be considered that the viscosity is the intrinsic factor affecting the neck-down process of the glass tube.

Therefore, further enhancing the properties of the incremental digital valve is more conductive to expand its application fields in high-performance hydraulic equipments [1, 2].
The mechanical equilibrium equation is， (7).
Fig.7 The control block diagram According to the system of differential and parallel digital valve, the relative factors affecting the frequency response of differential parallel valve are confirmed, and among these the performance of motors, the servo rotation mechanism and the valve structure are the key factors.
The mathematical model of novel digital valve’s servo-screw mechanism is built, the key factors affecting the dynamic characteristic of digital valve is obtained, which supplies references for component design.
LI, The 2D electro-hydraulic digital directional valve, Chinese Journal of Mechanical Engineering. 3 (2000) 86-89

Key idea of the technology is the adaption of the mechanical properties by a local heat treatment.
Thereby the mechanical properties of different material grades were analyzed in dependency of the heat treatment profile.
In case of tailored properties in the blank, one additional factor has to be taken into account.
This is the transition zone between two material properties that has to be defined by analytic description.
Moreover, the material characterization should be extended in order to achieve an even better modeling of properties in the heat affected zone exceeding the used linear interpolation.

The shape factors statistics are shown in Fig. 9.
Typically, a shape factor refers to a value that is affected by an object's shape but is independent of its dimensions.
Chen, Effect of heat treatment on mechanical properties of heavily cold-rolled Fe-6.5wt%Si alloy sheet, Sci.
Chen, Microstructure and mechanical properties of rapidly quenched Fe-6.5 wt.% Si alloy, J.
Dong, Effects of Ti addition and reheating quenching on grain refinement and mechanical properties in low carbon medium manganese martensiteic steel.

The finite element method has been used to study the relationship between the porosity and the mechanical properties by quasi-static compression simulation.
The basic mechanical properties of AISI 304 stainless steel were simplified by bilinear isotropic hardening model.
The basic mechanical properties of the AISI 304 stainless steel were listed in Table 1.
The mechanical properties of the matrix material at the elastic-plastic stage.
The results reveal that the porosity is the main factor affecting the mechanical properties of the steel-based porous materials, which is consistent with the theoretical formulas (3) and (4). 3.2 Quasi-static compression test In order to demonstrate the accuracy of the finite element simulation results under the quasi-static compression, real quasi-static compression experiment of the steel-based porous material with porosity of 82% was carried out as shown in Fig.4, the lower plate was completely fixed, and the upper plate was displacing uniform velocity (1mm/min) until the end of the experiment.

Error penalty parameter C and kernel parameters σ affect the generalization ability of learning machine.
Due to the different mechanical properties, acoustic pressure signal of coal and rock generated is also different, so the purpose of interface identification can be come true by detecting the acoustic pressure signal [3].
Dimensionless parameter mainly contains peak factor C, pulse factor I, margin factor L, skewness factor P, kurtosis factor K and form factor S [4-5].
With respect to the parameters of coal caving, the kurtosis factor, pulse factor, margin factor of rock falling increases obviously.
The feature vector Q built by the dimensionless parameter can be described: Q = [skewness factor, kurtosis factor, form factor, pulse factor, peak factor, margin factor].

Introduction Beryllium (Be) is one of the most attractive metals as structure materials due to its superior physical, thermal and mechanical properties, and it has been widely used in engineering domains such as nuclear energy systems and the propulsion systems of aviation and aerospace [1].
Such residual stress would have a strong influence on the mechanical properties of Be which is naturally brittle.
The specific factors were considered including CTE mismatch, temperature-related properties, the volume fraction, shape, size and distribution of second phase.
Material Properties for Modeling According to the actual process, initial and terminal temperatures were set at 1050 and 20 oC, respectively.
In such vast scale of changing temperature, the properties of materials are often dependent on the temperature.

The numerical modeling results by analyzing the displacement variation and soil affected area at different distances show that when the shield tunnel excavation, the ground settlement becomes smaller with increasing distance from the shield center line of the pile and the maximum ground settlement is 10.778mm.
The main physical and mechanical properties of the layers of soil are shown in Table 1.
Table 1 Mechanical parameters of soil strata Number soil Range （m） Density （kg/m3） Bulk modulus （MPa） Shear modulus （MPa） Friction angle （°） Cohesion （KPa） ① +3.97～+1.60 1850 5 2.3 14 18 ② +1.60～7.35 1920 9.83 4.53 15 38 ③ -7.35～12.75 1940 9.83 4.53 15 42 ④ -12.75～17.62 2100 16.6 7.96 33 52 ⑤ -17.62～20.79 2200 20.83 9.61 35 56 Fig.1 Concrete layout Modeling and analysis process Using FLAC3D software model size, according to the scope of the tunnel excavation, calculated with reference to both the experience and the practical engineering conditions, the bottom of the model from the tunnel to take center 27m, the entire model size is 80m×40m×40m, where the horizontal direction x 80m, value y direction is 40m (pile length direction), z-direction (the direction of tunneling) to 40m are shown in Fig.2 and Fig.3.
Fig.10 Vertical displacement Fig.11 Horizontal displacement Levels pile deformation analysis.Pile affected shield tunnel excavation will produce distortion in the horizontal direction, mainly for displacement in the horizontal direction.
Construction will shield the soil, pile produce a series of changes, changes in ground movement and rigidity produce pile soil properties affected by the decision are all horizontal displacement of the pile size factor.