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China, 454000 2 School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo, P.
The sensitivities of all kinds of effective factors to the dynamic porosity is analyzed and the order of parameters’ sensitivities to the dynamic porosity of 3D triangle structure is: pressure < temperature < initial porosity < network rod length < network rod radius.
Introduction The current basic components of most ultra-precise machines are made of the traditional casting iron and soldered structural steel, which is characteristic of some good static mechanical properties such as compression and bending strength, nevertheless, the shock-damping performance is up to the limit.
With the continuously development of the high-speed precise and high-effective processing technology, the poor dynamic properties of the casting iron and soldered steel is increasing apparent, and no longer is enough to meet the requirements of high precision, high thermal stability and high shock damping for the modern industrial machines [1].
For the further demand to improve the properties and performances of the precise machine’s components, the evaluation mechanism of shock damping and acoustic absorbing of ceramic material remains to further investigation and discussion. 3D network SiC ceramic with continuous pore structure has good shock damping and absorbing performance.

Fluidity in casting is the major factor which affects the cast quality of the final components.
Alloys of aluminium with Cu and Mg can retain good mechanical properties even under high temperature applications.
Sand casting from scrap showed good mechanical properties [6].
[5] S.Bozorgi and K.Anders.Mechanical Properties of high copper containing al-cu-si cast alloys at elevated temperature, Proceedings of ICAA-16 (2018)
Jimoh, Comparative study of the mechanical properties of sandcast and die-cast aluminium for engineering applications.

The research conducted to determine the foam’s mechanical properties (sound absorption coefficient, α) and physical properties (porosity and density) of high doping TiO2 of flexible polymer foam by increasing doped of TiO2 in the epoxy foam matrix, the reduction of α were observed but the frequency level were shifted from high to low consistently.
The number and the size of the pores are the important factors as they will influence the sound absorption mechanism [15].
Anika Zafiah: Effect of Titanium Dioxide on Material Properties for Renewable Rapeseed and Sunflower Polyurethane, International Journal of Integrated Engineering (Issues on Mechanical, Materials and Manufacturing Engineering), Vol.1 (2009), p.15-22 [4] S.
Part 2; Thermal Degradation and Materials Properties, Prog React Kinetic and Mechanism, Science Reviews, Vol. 34 (2009), p.1-43 [11] M.R.
Seddeq: Factors Influencing Acoustic Performance of Sound Absorption Materials.

Components of hydraulic propulsion system Symbol Significance 1 2 3 4 5 6 7 8 9 Signal generator Rotary mechanical gear Dynamic rotary mechanical node Cam profile with cam follower Generator piston with spring Pipeline system Receptor piston with spring Vehicle Hydraulic fluid properties Fig. 1.
Stress Life is based on empirical S-N curves and then modified by a variety of factors [7].
In general, there are three phases in any computer-aided engineering task: Pre-processing is defining the finite element model and environmental factors to be applied to it.
If the service part conditions differ from the as tested conditions, modification factors can be applied to try to account for the difference.
Fatigue strength factor Kf = 0.7 and LSF =1.1.

Unsolved Tasks For the effective use of man-made deposits it is necessary to analyze the sources of their formation, to research mining methods which affect their creation and other related factors associated with these processes.
Because it affects physical and mechanical rock properties (density, consolidation ability, water permeability), it can be divided into three groups: first, 1–5 years old; second, 5–15 years old, and third, 15–80 years old.
In addition, the choice of mining method of man-made deposits is influenced by the physical and mechanical properties of rocks (strength, filtration properties, etc.), technical conditions (equipment used for minerals extraction, transportation and auxiliary works), technological conditions (extraction mode, transport access scheme (layout), etc.), organizational (terms of preparation for extraction, number of changes, etc.), economic conditions (prime cost of production, productivity, profit, etc.).
Based on the above, the following factors must be taken into account for the mineral extraction from the dump: the technology that caused its formation; type of dumps formation; its age; physical and mechanical properties of rocks; technical, technological, organizational and economic conditions of formation.
The most suitable for such a extraction method is the waste of mills that have been aggraded and already have changed physical and mechanical properties of rocks, infrastructure and other indicators suitable for settlement [3].

There are many factors influence the distribution of the melt temperature, these factors have the coupling and nonlinear relationship which is difficult to measure accurately by the traditional measuring method.
Introduction Melt temperature is one of important parameters in polymer extrusion, which produces an effect on melt rheological properties and stability.
It is important influences on the properties of the finished products, and the temperature change will cause the melt viscosity changed too.
Thereby, all of the factors will cause the variation of the pressure and flow rate.
Selected 4 factors which affected mostly the polymer melt temperature field as the input variables, they were screw speed, die wall temperature, the wall temperature of the transition section and the measurement section, so the node number in the input layer of the neural networks was 4.

But this information processing and transferring manner is affected by vocation, knowledge structure and understanding ability of information receivers, so the exchange is very difficult.
Construction scheme design of complex structure based on virtual reality is to build three-dimensional CAD models (virtual model) of the ambient scene, structural members and mechanical equipment in the virtual environment through the VR technology, so as to form a computer-based simulation system with a certain function, to provide the models in the system with dynamic properties, to implement virtual assembly of these models and to modify the construction scheme in the man-machine interactive visual environment according to the result of virtual assembly.
Construction of complex structures involves many factors, such as position and height of the crane, the acting point of the mooring rope, position of the storage yard for construction members, running route of the crane, hoisting route of construction members, which must be taken into account in the design of construction scheme.
If these problems are insufficiently considered, construction schedule and cost will be affected, and even an accident may occur.
The interactive property of the VR technology can be employed to modify various types of data in a real-time way, so as to compare all schemes and results.

During this process, with the consecutive and simultaneous strokes of the die on the workpiece, the variations of the dimension and the improvement of mechanical properties of the workpiece take place.
The rotary swaging process is another mechanism in order to enhance the quality of the mechanical properties of the tube.
The rotary swaging process parameters can have an influence on the quality of the geometric and mechanical properties.
Analytical and Numerical Wear Rate Solution In mechanical friction contact, the phenomenon of wear is one of the factors that always occurs and determines the connection temperature of the interface and changes in the geometry of both contact surfaces.
The properties and material assumptions have been mentioned in previous articles of auteurs.

Based on the analysis of trends in the development of aviation and rocketry and ground transportation, the prospect of use of high-alloy steels, and titanium-based alloys with high strength, heat-and corrosion-resistant properties is established.
The working hypothesis of increase of efficiency of the ultrasonic drilling of small diameter holes proposes to consider correlation frequency supplied to the ultrasonic instrument, structural parameters and physical and mechanical properties of the material and to drive oscillations in the plane of the main cutting edges which would significantly reduce the magnitude of the oscillation amplitude.
Intorduction The general trend of modern production development , along with the widespread introduction of automation and computer technology application is implementation of new structural materials with a variety of physical, chemical and mechanical properties.
High elastic properties cause an increase in friction moment, the heating of the working area and, as a consequence , the reduction in resistance of the cutting edges and the entire instrument.
At the first stage there was examined the effect of structure and physico-mechanical properties of materials and the frequency of the ultrasound to the processes of indentation and microcutting of surface materials.

The study involved determining the frequency characteristics and the condition for maintaining contact between two sealing rings with completely different elastic properties.
Design and properties of the face packing seal The design and principle of operation (Fig. 1) of the face packing seal are similar to those of a mechanical face seal.
The fundamental difference is that one of the sealing rings in a face packing seal is made of a soft packing characterized by elastic and plastic properties.
The calculations were conducted for two configurations with significantly different parameters in order to show the substantial differences in their dynamic properties.
Gaft, Experimental investigations of physicomechanical properties of packing, Scientific Books, Series Technical Sciences – Exploitation and Mechanical Engineering, Kielce University of Technology, No. 10, Vol. 2, 2008, pp. 115-121.