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The recoil of airborne machine gun affects the safety of aircrafts.
There are many factors that affect the test precision of weapon recoil, e.g. thrust misalignment characteristics [1], calibration method used in recoil test [2], dynamic characteristics of the frame body and so on.
Factors affecting the dynamic characteristics of recoil test bench include frame body’s natural frequency, damping ratio, etc.
Some differences even reach 40% which affects the availability of test data seriously.
According to the actual structures and mechanical properties of the test bench, we select the appropriate frame body constraints, imposed load conditions and recoil test points in the simulation model. ①Constraints: DOF constraints on the bottom surface of test bench; ②Loading conditions: Impose pulse shock loads on the top of test bench along the shooting direction; ③Recoil test points: The actual installation positions of sensors.

This is because the processing of the shafts on CNC lathes introduces a number of technological errors [1-7] that affect the accuracy of mechanical processing.
The development of the manufacturing process for stepped shafts depends significantly on the following factors: the design of the shaft, the geometry of surfaces and the accuracy of their parameters, the interrelation of parameters, and the volume (quantity) of product output.
In addition to the listed factors, the method of obtaining workpiece parts is also of great importance [1-8].
v= CVTm tx Sy KV (1) Where T=60 min, the tool life is assumed, and the general coefficients take into account the factors such as the material requirement, tool strength, etc. [13].
Kp is a general coefficient that includes the machinability of the material, tool properties, and cutting force conditions.

The mechanical analysis is in good agreement with the three-point bending experiments performed on CFRP strengthened RC beams.
Some factors affect the load-carrying capacities and failure modes of FRP laminate strengthened structures, including mechanical properties of materials, geometry of structures and type of loading [5].
Mechanical Analysis on Load-carrying Capacity Fig. 1 shows the CFRP strengthened RC beam under three-point bending.
The thickness of externally bonded FRP greatly affects the load-carrying capacity and failure modes of strengthened RC beams under bending load.
And the mechanical analysis is in good agreement with three point bending experiments performed on CFRP strengthened RC beams.

Some properties of advanced material are important in airframe applications.
Chief among these properties are strength and stiffness, especially in relation to weight.
Meanwhile, some metals, such as titanium and steel, have mechanical and temperature properties that are crucial in some applications and cannot be matched by today's composites.
Titanium's mechanical properties, such as strength and stiffness, are more compatible with those of composites than are aluminum's, so titanium is used for applications in airframe substructures that are part metal and part composite.
Moreover, the mechanical and processing properties of current aluminum-lithium alloys are considerably superior to those of previous versions.

Solid loading is the key factor for the injection molding process and the properties of green body and sintered compacts.
Table 1 shows the properties of the two powders.
In CIM, solid loading is a key feature which affects the rheological behaviors of feedstock and the mechanical properties of final ceramics.
Table 4 shows the different mechanical properties of both powders, which includes green density, sintering density, shrinkage rate and fracture strength.
It is found that high solid loading is helpful to attain better mechanical properties.

Performance of Steel Slag and influence of the steel slag aggregate on physical and mechanical properties and durability of porous cement concrete were studied in this paper.
Therefore, porous cement concrete made by steel slag aggregate is probably of higher mechanical properties.
Physical and mechanical properties of porous cement concrete prepared by steel slag aggregate Table 4 was presented physical and mechanical properties of porous cement concrete prepared by steel slag aggregate.
In addition, mechanical properties of cement concrete were obvious different with different kinds of aggregates.
And interface bonding strength was affected by the strength of cement paste and thickness of interface.

Shorter [7] developed the spectral finite element method (SFEM) to calculate the dispersion properties of linear linear viscoelastic laminates and estimated damping loss factor of each wave type from the cross-sectional strain energy distribution.
Loss factors are obtained by CSM as well as finite element method (FEM) by ANSYS and spectral finite element method (SFEM) by Autosea2.
Another characteristics can be noticed is that multi-layer structures' loss factors change as freqency changes even if the core material's loss factor is set as a constant.
American Society of Mechanical Engineers, 1959: 49-87
Loss factors of viscoelastic systems in terms of energy concept [J].

Actually, building envelopes’ properties including lighting and thermal conditions are very important design elements affecting final building energy performance [2].
Kinetic envelopes design projects This section provides a summary of two of the final design projects submitted by the design teams that highlight responsible behaviors to climatic factors.
Elastic materials including inflated or water-filled material can change shapes and properties following external forces from human, rain, wind or others.
The embedded kinetic units can most impact on the building users and their comfort by controlling such factors as light, thermal comfort, and ventilation.
These methods of movement refer to the various mechanical motions needed to make a component actually move, as the next section elaborated.

Introduction Many areas of mechanical engineering are characterized by a permanent development of components and modules with the aim of reducing weight, increasing reliability, under the consideration of physical properties such as corrosion resistance or thermal conductivity.
The local fatigue strength in the component is influenced by rolling reduction, stress concentrations, forming process, residual stress and by other factors.
Therefore mechanical behaviour of the material can be considered independent from the manufacturing process and there is no influence of the rolling reduction on the mechanical properties of AA6016 (see Fig.2).
The influence of the rolling process on the mechanical properties is significant.
Karimi Taheri: the effect of annealing treatment on mechanical properties of aluminium clad steel sheet, Materials & Design 24, 617-622, 2003

The objective function was taken as the sum of the mass expression of each component of the frame with a series of punishing factors.
For a certain processing object, the factors affecting the service life of bead wire includes not only the bead wire structure, morphology and material properties, but also, to a great extent, on conditions of use, especially the cutting force, tension, wear, cyclic stress state, cooling condition, etc.
One of the most significant impact factors is the cyclic stress state and degree of wear and tear.
Enveloping angle and rope wear are two the important factors that complement each other and restrict each other.
Peng: Journal of Mechanical Engineering, Vol. 49 NO.3, p. 153-162.