The problem of developing a calculation-experimental method for calculating wear sliding bearing based on two-factor model (contact pressure - velocity) with identification resistance parameters was considered. On the basis proposed model, wear-contact cylindrical solved. equation equilibrium medium pressures and approximating function linear from arc contact between shaft bushing were used as determining equations. To identify in calculated dependences developed test by «cone – three balls»...

The object of this study is a spatial model the body frame for Ukrautobusprom 4289 city bus, which subject to structural optimization sidewalls in order strengthen them because increase equipped weight. reason loading need install batteries on roof, only possible location, given low-entry layout. Electrification buses associated with inevitable regulated reduction CO2 emissions by 30 % 2030 (Euro 7) and complete decarbonization 2050. Making up 30–40 total cost requires preservation when...

<ns3:p>The article presents tribological research on the cooperation of a kinematic pair composed metallic and polymer biomaterials. In sample tests, material widely used in orthopaedics dentistry was (the medical titanium alloy Ti-6Al-4V obtained both by traditional manufacturing methods, i.e. casting, additive method SLM/DLMS (3D printing)) counter (high-density polyethylene PE-UHMW). The friction selected this way subjected to tests PT-3 tribometer under specific operating conditions....

&lt;div&gt;The New Car Assessment Program (e.g., US NCAP and EuroNCAP) frontal crash tests are an essential part of vehicle safety evaluations, which mandatory for the certification civil means transport prior to normal road exploitation. The presented research is focused on behavior a tubular low-entry bus frame during impact test at speeds 32 56 km/h, perpendicular rigid wall surface. deformation zones in front roof parts were estimated using Ansys LS-DYNA considered such factors as...

The article addresses the issue of measuring and analyzing vibration characteristics mechanical systems without disassembly. Vibration diagnostics is one key methods for monitoring technical condition mechanisms, allowing timely detection potential malfunctions preventing serious failures. This approach helps reduce maintenance costs extend service life equipment. measurements make it possible to assess wear level components, detect clearances, imbalances, bearing damage, gear defects. One...

The problem of developing a calculation-experimental method for calculating wear sliding bearing based on two-factor model (contact pressure - velocity) with identification resistance parameters was considered. Analysis known studies has shown that existing approaches required solution complex systems integral-differential equations or cumbersome numerical methods are unacceptable in the engineering practice. As result, conditions boundary friction obtained form dependence rate dimensionless...

The study of the efficiency hardening parts working in spalling conditions through reeling with rollers were performed help physical simulation and showed high effect cast steels (a 10- to 14-fold increase durability). depth degree work during plastic deformation surface layer studied by method regression analysis. It was found that 95-% confidence intervals for calculated from results measurements yield strength make up 11‒36 % 32‒75 hardness measurements. Electrography examination has...

We have conducted a selection of diagnostic parameters to control technical condition the gear box. Development operation transportation vehicles is aimed at examining and predicting with formation rational base being key direction.Solving tasks in given scientific-technical field was based on theory relative sensitivity. This involved theoretically substantiated relationship between indicators reliability for assemblies their parametric dependence that we proposed. The implementation...

Our research into the formation of a functional copper-containing surface layer on parts automobile engines by using an alignment tribotechnology has established decrease in wear during their operation. It was found that formed coating creates elastic reduces strains material engine parts. experimental study coercive force parts' working surfaces confirmed accumulation destructive stresses near-surface layers components' material. In turn, comparative analysis obtained results coercimetric...

We analyzed the methods of determining characteristics friction based on experimental studies using damped oscillations a pendulum. It was established that available into viscous lack analytical description process at resistance and recommendations regarding practical calculation friction. Here we propose theoretical model swinging pendulum in cylindrical sliding supports with lubricant. is demonstrated for lubricated supports, described by second order differential equation resistance,...

The conditions of contact interaction (pressure, displacement, temperature) the surfaces machine parts as basis for their design and improvement are considered. It is noted that physics theoretical mechanics surfaces. A structural hierarchy types proposed. place mechanical among known to science four defined: strong, weak, electromagnetic gravitational. hypothesis has been put forward justified in a given range sizes, can be considered fifth between material objects world

The article presents studies of dynamic processes that occur during an electrohydropulse discharge. A method and design a device for hardening parts by high-voltage discharge in liquid has been developed. proposed allows to obtain depth the hardened layer up 30 mm with compressive stresses throughout its uniform microscopic relief working surface.

The article presents key issues regarding the field of knowledge logistics. nature and meaning a logistics system relevant logistic information are discussed. In further part work, selected IT systems supporting production processes company reviewed, presenting specific features each them. structure AFPRO Filters enterprise, where surveys were conducted, is also characterized. For purpose two carried out, based on which effectiveness using implemented assessed from point view users various...

The effect of anhydrous nitriding in a glow discharge on microhardness, phase composition, and wear resistance long holes steels C45, 37Cr4, 41CrAlMo7 with direct current supply cyclically switched (CSD) was studied. Nitriding carried out UATR-1 unit chamber diameter 400 mm working height 700 mm. Anhydrous glowing at temperature 560 °С, voltage 730 V, pressure the 120 MPa, duration 6 h. It established that using relatively small for creates conditions obtaining modified layers higher...

The movement of parts friction pairs with small quantities and displacements is the cause so-called stick-slip movement. This due to instability process formation destruction adhesive contact between surfaces. In this case, lubricant has a decisive influence on processes in contact. work, based diagnostic experimental complex, dependences magnitude force for various lubricants were obtained. Statistical characteristics scattering parameters are obtained estimate vibrations moving body. It...

The physical mechanisms have been investigated that form and transform the corpuscular-vortex-wave thermal complexes of disturbances in contact tribosystems based on quantum-mechanical exchange interaction. presence a gap determines generation pairs quasi-particles-disturbances stabilized by wavelength frequency. Internal instability collapse processes such system lead to formation defects tribopair's material underlie emergency friction regimes. This paper gives specific technical examples...

Research was conducted to determine the effect of lubricants on stress and strain in contact metal surfaces. Experiments were carried out introduction a fixed moving indenter with dry lubricated surface.The steel spherical specimen pressed into surface. The microstructures structure surface layer are studied under various conditions deformation. diagrams relative deformation layers constructed. mechanism formation distribution internal stresses for greased is described. Experimental studies...