UDC: 629.113
https://doi.org/10.25198/2077-7175-2019-4-121


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THEORETICAL APPROACH OF INFORMATIVITY ASSESSMENT TEST PARAMETER OF CAR TRANSMISSION

E.A. Penkov1, R.F. Kalimullin2

Orenburg State University, Orenburg

1 e-mail: pea-1i@mail.ru  

2 e-mail: rkalimullin@mail.ru 

Abstract. The development and complication of the design of the car's gearbox leads to an increase the workload, so the development of diagnostic systems with high automation is a necessary direction of development because it helps to reduce the workload. At different stages of the development and use of the diagnostic methods, knowledge of the informativeness of the test parameter is required. It is necessary to control and change the value of the test parameter. To date, it is difficult to find a way to determine the informativeness for the test parameter of a car transmission. The objective of the study is to develop a theoretical approach to evaluation the informativeness of the gearbox test parameter of the car.

The existing approach, based on the probabilistic characteristics of the diagnostic parameter of the healthy and faulty states, gives incorrect results. We chose an approach based on the theory of information. Based on the hierarchical additivity property, the informativeness of the test parameter was presented as conditional entropy of two compatible events: the receipt of test parameter and the detection of a defect. The efficiency of the approach was tested by finding the informativeness of the test parameter for the three stages of the evolution of the defect and when the test parameter was affected by two processing methods.

The proposed approach to estimating the informativeness of a diagnostic parameter is in addition to the existing ones, covering the area where discrete periodic functions with additive noise, having similar mean values and standard deviations for different technical states, are used as a diagnostic parameter.

Keywords: gearbox, technical diagnosis, test parameter, informative value, vehicle.

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