Mathematical Modeling of the Device for Determining Aircraft Hydraulic System Parameters

When investigating and diagnosing the technical condition of the hydraulic system or the aircraft, it is required to use the results of measurements of the flow and temperature of liquid in pipelines. On the basis of the specified requirements for flow and temperature transducers, it is most reasonable to use the thermoconvective method of constant temperature. Therefore, a thermoconvective transducer of flow and temperature of liquid has been developed. For parametric identification, an algorithm of composition of the following methods was used: steepest descent, quasi-Newton and coordinate methods. The effectiveness of the proposed algorithm in the conditions under consideration is proved by mathematical simulation of the model parameters vector optimal estimation procedure. Determination of the identified parameters estimates uncertainty was carried out according to the method based on the construction of joint confidence intervals of the required parameters estimates with a confidence probability α= 0.95. The calculated uncertainty of the parameter estimates was carried out at the flow measurement error δ= 3%.