Studying the system of diagnostic parameters of the hydraulic drive taking into account the measurement error

Abstract

Problem. The article considers a methodology for improving the efficiency of operational performance of mobile machines due to the perfection of the hydraulic drive diagnostic system, which is determined by the improvement of design, manufacture, and operation. Goal. The modern development of diagnostic methods is carried out through the use of more accurate or non-contact measuring instruments, and the technical condition of most hydraulic units is determined by the size of the gaps in the joints of their parts. Methodology. The study of the relationship between structural and diagnostic parameters based on the mathematical model of the hydraulic drive made it possible to develop diagnostics of hydraulic units of mobile machines by measuring the determining diagnostic parameter (performance or pressure) at one point of the hydraulic drive, as well as to establish analytical dependencies that determine the error of diagnosing hydraulic units and its components under uncertainty of the values of the gaps in these hydraulic units. Results. The presented work continues research in this direction and establishes the properties of the system of diagnostic parameters, in which the pump speed is the determining parameter. Originality. The properties of the system of diagnostic parameters, in which the pump speed is the determining parameter, are established. The relationship between the standard and the investigated systems of diagnostic parameters is established. Practical value. The equations are obtained and the diagnostic errors of hydraulic units and the components of these errors are determined using these equations when diagnosing by pump speed under the condition of uncertainty in the values of pump clearances. The results are compared with a standard diagnostic system.