DESIGN SPECIFICS OF A BUILT-IN DIAGNOSTIC SYSTEM FOR HYDRAULIC MACHINES

Abstract

The basis for obtaining information about the object of diagnosis is technical diagnostic tools, which involve measuring operations of various parameters, the totality of which is the basis of the diagnostic process. Diagnostic tools are divided into external, portable (mobile) and built-in. Built- in technical diagnostic tools are considered. The built-in diagnostic system (BDS) is an autonomous complex for automatic checking of the degree of operability and serviceability of units and the hydraulic drive as a whole, which allows, within limited limits, to localize some faults based on the results of monitoring diagnostic and functional parameters in operational or special test modes, and the diagnostic results can be presented to the operator or accumulated for further processing. Compared to other built-in diagnostic tools, BDSs are the most complex and relatively new devices. They are in the process of development, prototyping, and experimental research. A set of diagnostic equipment was designed, namely: designing a unit of measuring instrumentation; designing a load device for diagnosing pumps and taking load characteristics directly at the facility. The designed set of diagnostic devices is used as an integrated diagnostic system (due to built-in sensors), as well as a separate diagnostic complex due to the ability to connect external sensors. The values of the diagnostic parameters measured by this complex can be recorded on an internal memory card or transferred via wireless Bluetooth to a PC or Android device (smartphone, tablet) for further processing. A study was also carried out to assess the strength of the hydrotester body using a computational and analytical method (using the finite element method in the Ansys Static Structural environment), which is equivalent to full-scale testing in terms of boundary conditions and achievable results. Based on the calculation results, it is possible to assert that the choice of material and structural dimensions of the designed device were chosen rationally.