Quality evaluation of aircraft electronic instrumentation assembling based on registration and analysis of mechanical joints electromagnetic emission

Electrical Engineering

Electrical engineering complexes and systems


Grachev N. N.

Higher School of Economics, 20, Myasnitskaya str., Moscow, 101000, Russia

e-mail: nngrachev@mail.ru


The scientific significance of the results outlined in the work consists in studying mechanisms of contact radio interference originating, occurring due to the magnetic field effect of radio transmitters, located onboard an aircraft, on current-conducting mechanical contacts of the structures with non-linear variable resistance, as well as electromagnetic interference generation. The scientific results obtained from the studies demonstrated mechanisms of forming the current, induced by EMF, passing through the aircraft structural elements, which leads to formation of a mechanism of secondary electromagnetic field radiation, interacting with the primary irradiating magnetic field of the radio transmitter. There is a possibility to control the structural elements assembly quality by registering and analyzing the spectral composition of the electromagnetic radiation of the mechanically connected structural elements. Performing complex diagnostics, based on measuring the spectral content of the whole product, and placing antennae around the product under study allows performing reliable estimations of the assembly quality of both separate mechanic components and the entire structure.

The studies performed in this work can be applied to the development and study of a contactless express-method for assessing the structures assembly and erection quality. This method is based on the registration and analysis of artificially generated contact interference under the impact of mechanical vibrations and a high-frequency harmonic electrical signal on the aircraft structures' elements, forming phase-amplitude-modulated oscillation circuits, which can be recorded by either spectrum analyzer or a FAM receiver, or AM oscillations. With this, the levels of their spectral components are measured at a change of mechanical impacts frequency in the range determined by the operating conditions. The measured level of the spectral components of the emitted amplitude-modulated oscillations is compared with the level of the spectral components of the signal emitted by the reference block with given mechanical parameters and normalized level of contact interference.

The main result of these studies allows fruitfully employ the contact interference formation, considered as undesirable phenomenon in the field of electromagnetic compatibility, for estimating the mechanical qualities of the structures (their assembly quality) of various aircraft equipment and units, including assembly and erection quality (especially associated with fixture elements tightening force).


flying vehicles, electronic instrumentation, assembly quality, diagnostics, mechanical joints, electromagnetic emission, contact interference


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