To determine the diagnostic parameters of the fuel system of engines of grain harvesters, technological and structural parameters of the technical condition were considered. The authors investigate the structural schemes of indicator connection of the purpose (performance) of the fuel system of engines and parameters of the technical state of its structural elements. For example, we consider the modal structure diagram, which characterizes the fuel system of grain harvester engines and parameters of the technical state of their structural elements. For example, we consider the modal structure diagram, which describes the fuel system of the engines. At the highest level there are parameters that describe the process of fuel supply and directly determine the characteristics of injection, or the law of fuel supply. On the lower levels there are parameters that characterize the technical state of the most important elements of the fuel equipment. They are used for elemental diagnostics. Experimental studies of vibration characteristics of nozzles of diesel engines have shown that the energy vibration nozzles manifested most actively at the frequency from 5 kHz to 10 kHz. Application of Hilbert's conversion to vibration analysis has made it possible to use the ability to control the identity of nozzles and identify defects, such as breakage of nozzles and spray gun hangs. When the injection pressure changes from 27.0 MPa to 8.0 MPa, signal duration, which is measured between the front and rear fronts with maximum amplitudes, decreases 2 times. Application of technological cards together with diagnostic means will allow in 1,5 times to cut down the technical equipment due to technical problems at expense of preventing bursts and reducing the fuel consumption by 5-10 %. The range of sensors for diagnostics of diesels, the basic electric circuit of the tool for measuring the angle are developed for fuel supply, the requirements for the computerized system for bench diagnostics of the fuel equipment.
The crushing equipment is characterized by a significant energy-consuming system during the crushing workflow. The current trend in the development of such processes puts forward requirements for the development of new or improvement of existing energy-saving equipment. The essence of the solution to the problem in this work is determined by using resonant modes, which are inherently the most effective. The practical implementation of the resonance mode has been achieved taking into account the conditions for the interaction of the resonant vibration crusher with the material at the stages of its destruction. The degree of the stress-strain state of the material is taken into account, which was a prerequisite for identifying the potential for the development of a vibration load. Composed equations of motion based on a substantiated discrete-continuous model of a vibration crusher and processing material. An approach is applied to determine the stepwise destruction of the material with the determination of the required degree of energy. This methodological approach made it possible to reveal the nature of the process of material destruction, where energy costs at the stages of crack formation, their development and final destruction are taken into account. It was revealed that the greatest energy consumption during the operation of crushers goes into the kinetic energy of the crushing plates and the potential energy of deformation of the springs. The proposed model is common for any design of a vibration machine and its operating modes. The stable resonance mode has made it possible to significantly reduce the energy consumption for the course of the technological process of material grinding. The results obtained are used to improve the calculation methods for vibratory jaw and cone crushers that implement the corresponding energy-saving stable zones of the working process.
A simple technological method is proposed and tested experimentally, which allows for the improvement of mechanical properties in sheet two-phase high-strength titanium alloys VT23 and VT23M on the finished product (rolled metal), due to impact-oscillatory loading. Under impact-oscillatory loading and dynamic non-equilibrium processes (DNP) are realized in titanium alloys, leading to the self-organization of the structure. As a result, the mechanical properties of titanium alloys vary significantly with subsequent loading after the realization of DNP. In this study, the test modes are found, which can be used in the production conditions.
The article is devoted to increasing the efficiency of the process of vibro-pneumatic separation of grain and seeds by the intensification of the separation process under the additional influence on the grain layer of directive forces on particles. Through mechanical-mathematical and simulation models of particle movement in a grain layer and on a sieve surface, taking into account the separators of grain material, the layer dynamics of the mixture as well as the individual particle movement in the layer and their relationship with the constructive-kinematic and regime parameters of the vibro-pneumatic separation process have been identified.
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