Ensuring reliability of electronic equipment of sustained operation

Research field: Mathematical modelling of engineering systems

Project leader: Yurkov Nikolay Kondratievich, Doctor of Engineering Sciences, professor, head of the department ‘Radio Equipment Engineering and Production’

Key words: reliability, hidden defects, residual life, on-board electronic equipment, vibration, resonance, testing, aerospace equipment, forecasting

Abstract

The development of new generation aerospace and transport equipment is impossible without new methods of developing highly-reliable components and systems of onboard electronic equipment that meet the requirement for resistance to external environment. In current research there is not enough attention given to the details of conducting tests of components and systems of onboard electronics in the sphere of vibration impact in the upper part of the working frequency. The danger of working in the upper part of frequency range of vibration load is that in case of resonance (with the frequency 2KHz and higher) causes small absolute movements, and the acceleration in this situation are extremely high. High acceleration in combination with a big number of cycles of repetition lead to such negative results as sharp decrease of endurance strength of materials and inadmissible overload. Considering the above said, the development of new methods of non-destructive control and diagnostics of components and systems of onboard radio equipment in aerospace and transport industries will allow to conduct high precision testing of hidden (latent) technological defects without significant reduction of the equipment operational life. That is why it presents an important research challenge. The solution of the problem of developing new methods of testing will make great contribution into the theory of designing highly effective components and systems of onboard radio equipment, resistant to the impacts of the surrounding space. To solve the problem it is necessary to develop:
- new methods and means of control and diagnostics of components and systems of onboard radio equipment that can be used to conduct testing in the mode of controlled resonance in higher working frequencies;
- new models of finding hidden technological defects of components and systems of onboard electronics, that will consider the complex impacts of environment factors on the growth of defects;
- new methods and algorithms of testing components and systems of onboard radio equipment, to employ the saving mode of vibration tests.

Problem

Increasing the reliability of components and systems of onboard radio equipment of aerospace and transport vehicles by identifying hidden (latent) technological defects using new methods and means of non-destructive control and diagnostics.

Importance

The components and systems of radio equipment applied in transport and aerospace systems are characterized by the high level of exposure to external influences (vibrations, impacts, accelerations, temperature, etc.), that decrease their reliability parameters (the probability of failure-free performance, time to failure, mean operation life, etc.). That is why the development of new generation aerospace and transport vehicles is impossible without the development of methods for highly reliable components and systems of onboard radio equipment (data-measuring systems, control and navigation systems, etc.) that will meet the requirements of resistance to external factors.
In the process of developing new generation aerospace and transport vehicles the level of admissible load on the electronic components and systems also increases. It is necessary to provide vibration resistance to these components and systems. Currently there is not enough attention given to testing the components and systems of onboard radio equipment in sensitivity to vibration impacts at higher working frequencies. This problem has to be studies because the vibration impacts are responsible for 30% of all equipment failures, and the expansion of working frequencies might increase this numbers.
The danger of working in the upper part of frequency range of vibration load is that in case of resonance (with the frequency 2KHz and higher) causes small absolute movements, and the acceleration in this situation are extremely high. High acceleration in combination with a big number of cycles of repetition lead to such negative results as sharp decrease of endurance strength of materials and inadmissible overload.
During this process different hidden defects are revealed (poor quality soldering, connections, micro-cracks, etc.), which, undoubtedly, is a positive result, but this decreases the operation life of the tested object, which should be avoided.
To prolong the operation life of the equipment it is necessary to develop the models for possible defects growth and conduct tests over a period which is sufficient for the development and appearance of defects, but not enough for significant decrease of the tested object operational life. In this way, the development of new methods and means of testing components and systems of onboard radio equipment that will allow to diagnose hidden technological defects without significant decrease of the residual operation life, is a major research problem, the solution of which will increase the reliability of new generation aerospace and transport vehicles.

Research Originality

- developing new methods and means of control and diagnostics of onboard radio equipment that will allow to conduct tests in the controlled resonance mode, at higher working frequencies; this will allow to determine with high precision the hidden technological defects and prolong operational life of the equipment;

- developing new models of diagnosing hidden technological defects of the components and systems of onboard radio equipment that will consider the complex impacts of space environment on their growth; these models will help to determine the time necessary to conduct the test for diagnosing the majority of possible hidden technological defects;

- developing new methods and algorithms for conducting tests of the components and systems of onboard radio equipment, employing saving mode of vibration testing which will allow to support the necessary level of equipment residual operation life.

Expected outcomes and their importance

- methods and means of control and diagnostics for components and systems of onboard radio equipment that will allow to conduct research in the mode of controlled resonance at higher working frequencies; these methods will diagnose with high precision all hidden technological defects, but do not decrease significantly the residual operational life of the equipment;
- models of hidden defects growth in the components and systems of onboard radio equipment, that will consider complex impacts of space environment factors; these models will help to determine the time necessary to conduct the test showing the majority of possible hidden defects;
- methods and algorithms for conducting tests of the components and systems of onboard radio equipment that will work in safe vibration testing mode, which will ensure the necessary residual operational life of the equipment;
- methods of conducting tests for determining the dynamic characteristics of the components and systems of onboard radio equipment that are characterized by the use of necessary phase shift in test signal, contactless resonance indication, measuring the vibration speed in actual centres of eigen forms and developing the amplitude-frequency characteristic of the test object; all this will increase the correspondence between test and actual operation modes;
- algorithms and software related to forming the test signal with variable speed of frequency change and adjustment of time constant for the filter of low frequencies of the sensor; this will allow to increase the reliability of sensor data in the lower frequency range without significant time increase for conducting tests;
- structural diagram of data-measuring and control systems for determining the dynamic characteristics of components and systems of onboard radio equipment with the introduction of current sensor in the multi-channel vibration bench stand, so as to form the impedance-frequency characteristics of the test object, resistive opto-couplers in the active smoothing filter for regulating time constant, which improves the efficiency of testing;
- methods and software for diagnosing the residual life of the components and systems of onboard radio equipment that will consider the impact of hidden technological defects on endurance strength of materials; this will allow to increase the precision of forecasting;
- active plan of data-measuring and control systems for conducting tests of components and systems of onboard electronics in aerospace and transport vehicles.

Sphere of application

The planned outcomes will be applied in conducting tests of electronics for strategic purposes for cases when highest reliability is the key determining operational factor and equipment failures (including those caused by the growth of hidden defects) are not allowed.
Equipment breakdown of aerospace vehicles is very often caused by failures of components and systems of onboard radio equipment. Thus, in aviation this can lead not only to financial losses but to human losses as well. That is why, the economic and social importance of highly reliable components and systems of onboard radio equipment can not be overestimated.

Publications (WoS, Scopus)

1.    Yurkov, N. Research of the Frequency Spectrum of Mechanical Vibrations of Nonstationary Radio-electronic Systems / N. Yurkov, A. Zatylkin, N. Goryachev // International Journal of Applied Engineering Research. Volume 10, Number 23 (2015). pp 43822-43824.
2.    Zatylkin, A. Control Time Constant During Tests of Nonstationary Electronic Facilities / A. Zatylkin, N. Yurkov, D. Golushko // International Journal of Applied Engineering. Volume 10, Number 23 (2015). pp 43825-43826.
3.    Modeling the Effect of Local Thermal Effect on the Stress-strain state of the Conductive Layer Printed Circuit Board / A. Telegin, A. Zatylkin, M. Kalaev, N. Goryachev, N. Yurkov // International Journal of Applied Engineering Research. Volume 10, Number 23 (2015). pp 43827-43830.
4.    Study Algorithm Speed Signal Generating Feedbackfor Information-measuring System Control Active Vibration Protection Red / P. Bushmelev, A. Pivkin, B. Kuatov, A. Lysenko, S. Zatylkin // International Journal of Applied Engineering Research. Volume 10, Number 23 (2015). pp 43831-43834.
5.    Lysenko, A. An Information-measuring Control System for Active Vibroprotection of Radio-electronic Devices / A. Lysenko, A. Zatylkin, N. Yurkov // International Journal of Applied Engineering Research. Volume 10, Number 23 (2015). pp 43835-43838.
6.    Tankov, G. The Report of Data Exchange of Multichannel Vibration Testing Equipment with the Program Environment of Researches Control / G. Tankov, A. Zatylkin, N. Yurkov // International Journal of Applied Engineering Research. Volume 10, Number 23 (2015). pp 43839-43841.

Contacts

Tel.: +7 (412) 36-82-12, +7 (412) 56-43-46
E-mail: kipra@pnzgu.ru,  yurkov_nk@mail.ru

 

Дата создания: 13.11.2017 14:48
Дата обновления: 28.11.2017 11:38