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AVIONICS AND WEAPON SYSTEMS ENVIRONMENTAL RESISTANCE

The experimental facilities of FGUP GosNIIAS applied research laboratory feature a wide range of testing equipment allowing the environmental testing of both avionics and weapon systems, as well as complete units, in compliance with current standards and regulations.

Past experience has proven that the following tests by order of the industry are most in demand:

Test facilities are being constantly improved and upgraded. At present solar radiation tests are most in demand. To meet the demand a solar radiation simulator will be built in the research laboratory in the near term.

In addition the following parameters are estimated at various stages of aircraft and airborne weapon development:


 

Acoustic noise tests

The research laboratory test facilities feature an acoustic test bed.

The acoustic test bed is designed for airborne and radioelectronic equipment items and components testing and performance analysis, in particular, intense sound field resistance.

The acoustic test bed comprises an acoustic reverberation test chamber with an electrodynamic acoustic radiator and an equipment room with a power amplifier and control and measuring equipment and features the following technical characteristics:

Parameter Value

Signal

Acoustic noise

Maximum acoustic pressure level at an acoustic horn exit opening, dB

148

Frequency range, Hz

80 10000

Acoustic chamber volume, m3

35

The acoustic chamber volume allows testing both large-size (up to 4 m) and small-size items.

 

Aerodynamic heating tests

The research laboratory facilities include the unique UMAN-6 simulator designed for airborne equipment and weapon aerodynamic heating simulation and featuring the following technical characteristics:

Parameter Value

Operating area diameter, m

0,45 0,58

Operating area length*, m

2,5 4,5

Test item maximum weight, kg

5000

Reproduced temperature range,

40 600

Temperature setting error for stationary modes, :
40 100
100 180
180 600


2
5
15

Thermal loading maximum rate for stationary mode setting, /min

50

Thermal loading maximum rate for thermal shock mode setting, /min

400

*If necessary the simulator configuration allows testing larger items (up to 7 m long), but in several steps.

For item surface temperature setting and measuring state-of-the-art surface sensors and measuring equipment are used, providing high time sampling rate and high accuracy temperature control. All measuring equipment (instrumentation) is registered in the State Register of Approved Measuring Instruments and is regularly calibrated in compliance with RF standards.

At present the simulator is being upgraded to enhance its performance characteristics.

 

Climatic and underpressure tests

For climatic testing the research laboratory uses climatic chambers having volume of 0.06; 2.0 and 3.4 m3, permitting item testing in temperature range from -80 to +150 at humidity ranging from 20 to 98%.

The laboratory also features test chambers for aircraft, avionics- and airborne weapon testing for the effects of exposure to:

  • high humidity;

  • high and low temperature;

  • salt spray.

At present equipment updating and procurement is under way to allow aircraft, avionics and airborne weapons underpressure testing.

 

Environmental dynamic tests

The research laboratory offers various types of environmental dynamic testing to reproduce environmental conditions during equipment strength, resistance and reliability analysis in various areas.

The following types of loads are used for environmental dynamic testing:

  • sinusoidal vibration;

  • broad-band random vibration;

  • ideal shock pulse;

  • shock response spectrum;

  • short-term low-frequency dynamic loads;

  • resonance frequency identification, tracking and operation.

Parameter Value

Propulsive force, kN

58

Maximum acceleration amplitude, g:
Sine signal
Random signal
Shock wave


100
100
224

Maximum displacement amplitude, mm

30

Frequency range, Hz

5 3000

Maximum peak shock acceleration, g

800

The equipment being used allows testing items weighing up to 1000 kg along three orthogonal axes.

 

Integrated effects tests

The research laboratory conducts tests for the integrated effects including equivalent cyclic reliability tests of aircraft, avionics and airborne weapon systems. During these tests near real-time simulation of integrated simultaneous environmental effects and airborne equipment operation is performed. The result is achieved by means of complete integration in the test bed of exposure factors with their dynamic change during the tests according to flight profiles and missions.

Equivalent cyclic tests are carried out to:

  • reveal structural, technological and production defects;

  • assess the compliance of airborne equipment reliability factors with performance and specification requirements for respective development phases;

  • assess the efficiency of airborne equipment reliability control and improvement measures;

  • estimate the attained reliability level.

In the process of testing the airborne equipment is exposed to cyclic environmental effects where a single test cycle represents a single flight.

 

Electromagnetic tests

In the area of electromagnetic testing GosNIIAS offers:

  • estimation of electromagnetic environment inside various platforms and avionics and weapon bays;

  • estimation of aircraft and airborne weapon safety under exposure to electromagnetic fields of natural (electrostatic discharge, lightning discharge) and artificial (aircraft equipment and supply lines, radio transmission and radar stations, deperming stations, high-voltage transmission lines, high-voltage railroad overhead lines, nuclear electromagnetic pulse) origin;

  • development of programs and methods for aircraft and airborne weapon safety testing under exposure to electromagnetic fields of natural (electrostatic discharge, lightning discharge) and artificial (aircraft equipment and supply lines, radio transmission and radar stations, deperming stations, high-voltage transmission lines, railroad high-voltage railroad overhead lines, nuclear electromagnetic pulse) origin;

  • methodological support and participation in safety tests with test report issuing.

At the premises of the research laboratory the efforts are planned on avionics and weapon systems electromagnetic compatibility evaluation and optimization considering the effects of:

  • power supply quality;

  • audio-frequency and radio-frequency conducted and inductive disturbances as well as impulsive noise in supply networks and avionics communication links;

  • external electromagnetic fields;

  • impulse currents induced by lightning and electrostatic discharge.

 

Gas-Dynamic Stability

Our specialists perform the assessment of aircraft engine gas dynamic stability (engine flameout protection) during airborne weapon launch. The assessment is carried out by means of mathematical modeling of airborne weapon engine exhaust effect on launching aircraft engine with account for launching aircraft flight parameters and launcher location.

 


For further information please contact:
Oleg V. Sokolov (Head of Division): +7 (499) 1579126, (499) 1579368;
E. Yu. Alexyeev (Deputy Head of Division): +7 (499) 7286512, (499) 1579202;
Valery A. Smal (Head of section): +7 (499) 7286512, (499) 1579374.


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