Estimation of economic efficiency of forestry tractor under production operation conditions
https://doi.org/10.21266/2079-4304.2023.243.210-226
Abstract
It is difficult to evaluate the efficiency in a non-stationary mode, which is typical for the operating conditions, as the loading and speed modes are constantly changing, and the value of mechanical losses in the friction pairs is also changing. In this case, it is advisable to evaluate the efficiency with regard to fuel and power consumption for mechanical losses in friction pairs, that is, according to indicator parameters – the specific fuel consumption and indicator power. The value of the hourly fuel consumption and the average indicator power depends on the design parameters of the tractor, the size of the transported cargo, the average speed and operating conditions. The character is determined by the transfer function U(s) – the dynamic characteristic of the engine speed. Guaranteed by the manufacturer of the engine, the hourly and specific fuel consumption and power differ from the actual values at operation of the tractor in the whole range of loading and speed modes. Experimental researches of different types of engines with the subsequent approximation by analytical expressions of amplitude-frequency characteristics of crankshaft rotation frequency have allowed to receive a transfer function of rotation frequency, which in turn gives an opportunity to consider mechanical losses in engine friction pairs in a non-stationary mode at estimation of economic efficiency of a forestry industrial tractor.
About the Authors
Y. L. Pushkov
St.Petersburg State Forest Technical University
Russian Federation
Russian Federation
PUSHKOV Yurii L. – PhD (Technical), Associate Professor of the Department of Forestry Engineering, Service and Repair
194021. Institute per. 5. St. Petersburg
A. S. Krivonogova
St.Petersburg State Forest Technical University
Russian Federation
Russian Federation
KRIVONOGOVA Aleksandra S. – PhD (Technical), Associate Professor of the Department of Applied Mechanics and Engineering Graphics
194021. Institute per. 5. St. Petersburg
S. V. Spiridonov
St.Petersburg State Forest Technical University
Russian Federation
Russian Federation
SPIRIDONOV Sergey V. – PhD (Technical), Head of the Department of Forestry Engineering, Service and Repair
194021. Institute per. 5. St. Petersburg
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For citations:
Pushkov Y.L., Krivonogova A.S., Spiridonov S.V. Estimation of economic efficiency of forestry tractor under production operation conditions. Izvestia Sankt-Peterburgskoj lesotehniceskoj akademii. 2023;(243):210-226. (In Russ.) https://doi.org/10.21266/2079-4304.2023.243.210-226
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