Reliability SAU
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Reliability SAU

Reliability SAU

 

Reliability ACS provides complex tools. These include:

  • - The use of electronic component base with a high degree of integration, which has high reliability (failure rate 10_6. 10-8 1 / h) in actual operating conditions (ambient temperature -60 ... + 125 ° C, high vibration, specific feedback for military aircraft engines ) and reliable components (sensors, actuators, etc.);
  • - The use of hardware redundancy in the electronic part of the ACS, and with the help of hydro-mechanical controls or other type, and backup software;
  • - The introduction of an electronic controller embedded monitoring and diagnosis of ACS;
  • - Redundant power supply sources through the use of on-board AC and DC, and also using a standalone power generator;
  • - The establishment in operation as much as possible comfortable conditions for the operation of the apparatus of ACS ambient temperature, vibrations (accommodation, cooling, anti-vibration support, etc.);
  • - Special technological measures in the manufacturing process (input control burn-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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