The article analyzes the causes of failures of vehicle structures belonging to complex systems. In order to ensure the operational reliability and operability of freight rolling stock, namely the supporting frames of automotive cargo semi-trailers and trailers during their operation. The chosen topic is relevant today, because the automotive industry is firmly in the lead in the transport industry. It is known that the quality of transportation is determined by the technical conditions of rolling stock. This is especially important if the rolling stock is represented by vehicles The reliability of freight rolling stock was studied, taking into account 2000 hours of experimental tests at the machine-test station during transport works, including 3.5 thousand loading and unloading cycles, which is 50% of the operating time. It is noted that the organization of transport work of the machine-test station does not exactly coincide with the real operating conditions, which affects the reliability indicators: for example, readiness and average failure time increase, and failure decreases. Structural analysis of the fault complex is an important part of a comprehensive system to ensure the reliability and survivability of the supporting frame of the car trailer. Generally speaking, the main causes of metal failures are manufacturing defects (production stage) and design errors (design stage), and the overall failure rate due to poor design and production quality can be over 50%. The analysis of the causes of failure of welded metal structures shows that the influence of a single factor on its frequency in emergency situations, factors related to stress concentration and subsequent development of cracks, is up to half. Of these, breakdowns due to design defects at the design stage and poor quality of manufacture and assembly of machines are about a quarter each, and due to low technology and low quality materials - more than a third, due to violations of vehicle rules and low quality staff - every tenth.

operational reliability, operability, automobile rolling stock, freight automobile rolling stock

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1. Pidhurs'kyj, M.I. (2007). Metody prohnozuvannia resursu nesuchykh i funktsional'nykh system buriakozbyral'nykh kombajniv [Methods of forecasting the resource of bearing and functional systems of beet harvesters]. Doctor's thesis. Ternopil': TDTU [in Ukrainian].

2. Schuryn, K.V (1994). Prohnozyrovanye y povyshenye ustalostnoj dolhovechnosty nesuschykh system sel's'kokhoziajstvennykh traktornykh sredstv [Forecasting and increasing the fatigue life of the bearing systems of agricultural tractors]. Doctor's thesis. Orenburh: OPY [in Ukrainian].

3. Popovych, P.V., Shevchuk, O.S., etc. (2016). The service life evaluation of fertilizer spreaders undercarriages. INMATEH, 50 (3), 39–46 [in Ukrainian]..

4. Shevchuk, O.S. & Selivanova, N. (2020). Nadijnist' metalokonstruktsij prychepiv [Reliability of metal structures of trailers]. Fundamental and applied problems of modern technologies : Mizhnarodna naukovo-tekhnichna konferentsia do 60-richchia z dnia zasnuvannia Ternopilskoho natsionalnoho tekhnichnoho universytetu imeni Ivana Puliuia ta 175-richchia z dnia narodzhennia Ivana Puliuia (14-15 travnia 2020 r.) – International Scientific and Technical Conference for the 60th anniversary of the founding of Ternopil National Technical University named after Ivan Puluy and the 175th anniversary of the birth of Ivan Puluy (pp. 45).Ternopil’ : TNTU [in Ukrainian].

5. Bykovs'kyj, O.H. (2021). Zvariuvannia, rizannia j kontrol' iakosti pid chas vyrobnytstva metalokonstruktsij: pidruchnyk [Welding, cutting and quality control during production of metal structures]. Kyiv : Osnova [in Ukrainian].

6. Sukhenko, Yu.H. (2011). Tekhnolohiia avtomobilebuduvannia [Automotive technology]. Kyiv: Universytet «Ukraina» [in Ukrainian].

7. Popovych, P.V. & Shevchuk, O.S. (2017). Orhanizatsiia diial'nosti avtomobil'noho transportu iak funktsii bezpeky dorozhn'oho rukhu [Organization of road transport as a function of road safety]. Road traffic safety: legal and organizational aspects: ХІІ Mizhnarodna naukovo-praktychna konferentsia (m. Kryvyj Rih, 17 lystopada 2017 r.). – International Scientific and Practical Conference (pp.180-184) . Kryvyj Rih [in Ukrainian].

8. Popovych, P.V., Shevchuk, O. &, Murovanyj, I. (2017). Pidvyschennia efektyvnosti tekhnolohij perevezen' orhanizatsijnymy shliakhamy nadannia transportnykh posluh [Increasing the efficiency of transportation technologies through organizational ways of providing transport services] . Visnyk KhNTUSH – Herald of KhNTUSG, Issue 184, 124 - 130. [in Ukrainian].

10. Popovych, P.V., Shevchuk, O.S., Matviishyn, A.J. & Lotots'ka, V.M. (2016). Doslidzhennia tendentsij rozvytku rynku vantazhnykh avtomobil'nykh perevezen' u suchasnykh [Study of trends in the development of the road freight transportation market in modern conditions] . Visnyk Zhytomyrs'koho derzhavnoho tekhnolohichnoho universytetu. Seriia: Tekhnichni nauky – Bulletin of the Zhytomyr State University of Technology. Series: Technical sciences, 2, 224-229. [in Ukrainian].

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