Reliability SAU
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Reliability SAU

Reliability SAU

 

Reliability ACS provides complex tools. These include:

  • - the use of an electronic element base with a high degree of integration, which has high reliability (failure rate 10_6. 10-8 1 / h) in real operating conditions (ambient temperature -60 ... + 125 ° С, increased vibrations, specific effects for military aviation engines ), as well as reliable components (sensors, actuators, etc.);
  • - the use of hardware redundancy both in the electronic part of the ACS and with the help of hydromechanical or other type regulators, as well as software redundancy;
  • - introduction into the electronic regulator of the built-in control and diagnostics system of the ACS;
  • - power supply redundancy through the use of on-board AC and DC sources, as well as with the help of an autonomous electric generator;
  • - creating in operation as comfortable as possible conditions for the operation of the ACS equipment according to the ambient temperature, the effect of vibrations (placement, cooling, anti-vibration mountings, etc.);
  • - special technological measures in the production process (incoming control, thermal training, etc.).

 

As a rule, the electronic control is performed with a dual-channel full or in part for each channel sensors and actuators. The required control functionality provided by the use of high-performance (speed up to 20 Cor million op. / Sec) processor, sufficient in terms of RAM (RAM) and permanent (ROM) memory, and others.

Electronic controls are mounted on the engine (for engines large and medium-scale), as well as in the engine compartment or on board (for motors of small dimensions). In some cases, determined by the operating conditions and the performance of the hardware applied forced cooling air regulator or fuel.

To improve the safety of operation can be used hydromechanical backup controllers or other type or manual control. The achieved level of reliability of electronic automatic control system allows us not to use such reserve regulators for engines installed on airplanes of civil and military, with two or more engines.

Fuel systems of modern engines run with two-stage centrifugal pump priming low pressure in the first stage and high-pressure pumps in the second stage. All pumps usually are driven by the engine gearbox.

As the high pressure pumps are mainly used in pumps, the performance of which is not specifically regulated and determined by the frequency of rotation of the motor rotor in this mode (gear and centrifugal pumps). Exceptions are plunger pumps, allowing to change the performance, regardless of speed. However, the scope of their application is limited due to lower life and high cost.

 

 

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