Abstract
When using a machine-tractor unit, external conditions of its operation change in a wide range. It results in frequent changes in the parameters of speed and load modes of its power plant. Resulting vibrations and oscillations in addition to discomfort and excessive loads on components and mechanisms of the power plant also cause fuel overspending and power losses. To reduce negative vibration impact on effective performance of the power plant creation of supports with adjustable characteristics is suggested. Both internal unbalance of the power plant itself and external influence of variable moment of resistance and impulses of supports themselves are considered perturbing moments. Changes in rigidity and damping coefficients of relevant supports can reduce the amplitude of oscillations of the power plant in variable operating modes, which will improve its utilization indicators.
Highlights
In operational conditions, the operation of power plants of machine-tractor units (MTU) is followed by changes in speed and load modes of operation
Internal factors include unbalanced forces and moments of inertia of reciprocating and rotating moving masses, technological and structural unbalance of the engine and various technical conditions of its cylinders; and external factors include the changeable nature of the surface pattern, treated soil or parameters of technological process [3]
The level of vibration load of MTU and selfpropelled vehicles depends on a number of different reasons, among which the following ones are determining: design and mode of operation of the power plant, number, location and parameters of power unit (PU) supports, suspension structure, type of tires used, characteristics of micro profile of road surface, fuel used, etc. [4]
Summary
The operation of power plants of machine-tractor units (MTU) is followed by changes in speed and load modes of operation. Part of this work goes into potential energy of the spring, and part of it goes into heat and is dissipated by damping element [10] The application of this method of vibration protection makes it possible to reduce dynamic effects created by vibration source, due to dissipation of vibrational energy in vibration isolator. There are undesirable phenomena associated with an increase in static displacements of the protected object in relation to the source, and there is an increase in the amplitude of relative oscillations in low-frequency and shock disturbances For this reason, the use of vibration isolators needs the search for compromise solutions that meet various requirements. To reduce the negative impact of vibrations and oscillations of the engine frame on operation of the machine-tractor unit, it is necessary to select parameters of supports of power plants so that they could absorb the energy of these oscillations with maximum efficiency [11]
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