View of the Article PDF: 10_Fedorov&Ko
© Volodymyr Fedorov, PhD, Associate Professor, ORCID:0000-0002-1085-5112, е-mail: fedorov.volodymyr@gmail.com;
© Galyna Filipova, PhD, Professor, ORCID:0000-0003-3427-7633, е-mail: galina_gaj@ukr.net;
© Vasyl Yanovsky, PhD, Associate Professor, ORCID: 0000-0001-9437-4537, е-mail: yanovskyi_v@ukr.net
(National Transport University)
COATING THE BODY OF THE KRAZ ‘FIONA’ ARMORED CAR WITH A COMPLEX RESONATOR PLATE AS A MEANS OF REDUCING ITS EXTERNAL NOISE LEVEL
DOI: 10.33868/0365-8392-2026-1-286-71-79
Abstract. Today, on the one hand, there is an unsatisfactory situation in the field of acoustic safety of the population, which negatively affects the financial and economic activity of the Ukrainian industry. On the other hand, given the state of war in the country, noise also acts as a harmful unmasking factor for military equipment. These circumstances emphasize the relevance of the problem of reducing the noise of military vehicles. One of the most powerful sources of noise in such vehicles is the engine, which creates general noise. This noise has components: noise emitted by the engine surface; structural noise emitted by the car body and the source of which is vibration created by the engine; noise of the intake system; noise of the exhaust system; noise of the pumping unit and some others. We want to focus our attention on the structural noise that arises due to vibration created by the engine. The socalled complex resonator plate has been developed, which should be attached to the surface of the armored vehicle body. In this work, the KrAZ “Fiona” armored vehicle is proposed as the object of research. The complex resonator plate consists of several single resonator mufflers of different geo-metric dimensions, and therefore resonance frequencies. All single resonator mufflers are made in the form of parallelepipeds, and for convenience their necks are not outside, as in classical resonator mufflers, but inside. In addition, in order to reduce the resonant frequency of single resonator mufflers, it is proposed to increase the length of the necks, making the latter in the form of coaxial pipes. To increase the sound-absorbing properties of the complex resonator plate in frequency ranges that do not correspond to the resonant frequencies of single resonator mufflers, it is proposed to cover the inner walls of the latter with glass as a material with high soundabsorbing properties. The work calculates single resonator mufflers for different overall dimensions and neck lengths. The frequency characteristics of single resonator mufflers and the proposed type of glass for covering the internal surfaces of the latter are provided. The efficiency of the developed complex resonator plate is predicted. Keywords: armored vehicle, KrAZ “Fiona”, external noise level, unmasking factor, resonator mufflers, resonance frequency, complex resonator plate, acoustic efficiency, sound absorption coefficient, main cycle.
References
1. Spetstechnoexport. (2026). KrAZ-Fiona. Tekhnichni kharakterystyky [KrAZ-Fiona. Technical specifications] Retrieved from https://spetstechnoexport.com/uk/product/kraz-fiona.
2. Fedorov V. V. (2008). Akustyka avtomobilya: Prynt [Car acoustics: Print]. Kyiv, 285. [in Ukrainian].
3. Fedorov, V. V., Filipova, G. A., Yanovsky, V. V. (2022). Rezonatorna plyta [Resonator plate]. Patent 151376, bulletin “Industrial Property”, 28.
ISSN 0365-8392
DOI: 10.33868/0365-8392-2026-1-286-71-79
Date of first receipt of the article: 01.03.2026
Date of acceptance for publication: 15.03.2026
Date of publication: 31.03.2026