Mathematical Model of Forecasting Durability of Bus Bodies and Checking it for Adequacy

Ruban, Dmytro

doi:10.31649/1997-9266-2020-150-3-81-89

Cited by 3 publications

(20 citation statements)

References 1 publication

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“…The built model is implemented in the MATLAB Simulink 2017 b programming environment [21]. To confirm the adequacy of the model, road tests of the Ukrainian-made bus A09216, based on the Japanese assembly units, were carried out [22], which confirmed the obtained values of deformations in the examined body frame element [13]. The adequacy of a given model was also confirmed when predicting the resource of the most loaded elements of the body frame.…”

Section: Literature Review and Problem Statementmentioning

confidence: 83%

“…The corrosion of the base frame would be affected by the service life and, accordingly, mileage, as well as the city where the bus is operated. In a city with a population of up to 1 million, there would be a lower corrosion intensity [13] than that where there are more than 1 million people, by about 2 times.…”

Section: Tablementioning

confidence: 99%

“…There is also a methodology for predicting the loading of buses by passengers [12] but it does not make it possible to determine the durability of buses as close as possible to the actual operation. Based on the procedure reported in [11], a mathematical model was built, which describes the transfer of effort from the micro profile of a road to the examined element of the body frame [13]. The model given in [13] takes into consideration, similarly to the model reported in [14], the forces transmitted from the road micro profile but the model from [13] also takes into consideration the corrosion of the bus body frame, which corresponds to actual operating conditions.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

“…Based on the procedure reported in [11], a mathematical model was built, which describes the transfer of effort from the micro profile of a road to the examined element of the body frame [13]. The model given in [13] takes into consideration, similarly to the model reported in [14], the forces transmitted from the road micro profile but the model from [13] also takes into consideration the corrosion of the bus body frame, which corresponds to actual operating conditions. The corrosion processes of the bus body are described in [15], considering [16], and according to dependences [8], derived from treating the statistics on bus operation in cities with different numbers of inhabitants.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

“…The adequacy of a given model was also confirmed when predicting the resource of the most loaded elements of the body frame. The results were compared with statistics for constant bus overload when driving on low-quality roads, at an average speed of 40 km/h [13]. That makes it possible to conduct further research on determining the durability of bus bodies.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

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Forecasting the durability of public transport bus bodies depending on operating conditions

Ruban¹,

Kraynyk

Ruban

et al. 2021

EEJET

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This paper addresses the issue related to forecasting the durability indicators of public transport buses under operational conditions. It has been established that when buses are operated to transport passengers the bus bodies wear at different intensities. During operation, the strength of the body frame weakens under the influence of corrosion in combination with sites of fatigue destruction. As it was established, the intensity of corrosion of the bus body depends on the number of residents in the city where the bus is operated. The earlier established dependences were taken into consideration; the current study has identified two conditional variants of corrosion evolution based on the number of inhabitants: up to 1 million and exceeding 1 million. The expediency of repairs and their impact on the bus passive safety has been analyzed. It was found that the elements of the body frame, without external characteristic damage, no longer meet the specified conditions of strength as a result of sign-alternating loads and during long-term operation. Determining the durability of the bus body was made possible through the construction of a mathematical model. The model’s adequacy was confirmed by road tests of the bus. The devised model describes the movement of the bus over a road surface with different micro profiles, with different corrosion penetration, different loading by passengers, and bus speeds. It was established that the reason for the evolution of structural corrosion is the influence of salt mixtures preventing the icing of roads, as well as ignoring the washing of buses after such trips. It is recommended to use new software for the in-depth study into this issue addressing the combination of various factors of destruction: cyclic loads at variable bus speeds and the corrosion progress. The study results could make it possible to predict a life cycle of the body frame under factors that correspond to actual operating conditions.

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Section: Literature Review and Problem Statementmentioning

confidence: 83%

Section: Tablementioning

confidence: 99%

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Section: Literature Review and Problem Statementmentioning

confidence: 99%

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Forecasting the durability of public transport bus bodies depending on operating conditions

Ruban¹,

Kraynyk

Ruban

et al. 2021

EEJET

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Devising an approach to assessing the durability of bus body on a frame chassis

Ruban¹,

Kraynyk²,

Ruban

et al. 2023

EEJET

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The object of this study is the processes and permissible limits of aging of bus bodies on the frame chassis during operation. As a result of research by simulation method, the durability of the bus on the frame chassis, was determined, which is in the range from 5 to 11 years depending on the operating conditions. The study took into account the following factors: passenger occupancy, microprofile of the road, bus speed, corrosion. The durability of the bus depends primarily on the durability of the frame and body frame. Since the frame is made of alloy steels and heat-treated, it is not repaired but replaced with a new one when cracks in the frame are formed. When determining the durability of the bus on the frame chassis, it was found that the frame has 1.5–1.8 times greater durability than the body frame itself. This is because the frame is made of alloyed materials and has an open structure. The body frame has closed cavities, which provoke the development of corrosion with the accumulation of moisture in them. A feature of the results is that previous studies considered buses only with a load-bearing body structure. The issue of durability of bodies on the frame chassis has been considered. As experience shows, the durability of bus bodies on a frame chassis depends on many operational factors. For operating organizations and manufacturing plants, it is important to provide for the durability of the bus depending on the operating conditions. The results of this study will allow operating organizations to provide for scheduled repairs, as well as take measures to increase the service life of buses during operation. For manufacturing plants, the findings will make it possible to apply rational technologies and materials to form the service life of the bus body.

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Predictive Assessment of Bus Body Life in the Matlab Simulink Software Environment

Ruban,

Lanets,

Kraynyk

et al. 2024

Communications

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The lifespan prediction of the bus body of the load-bearing structure has been made and compared to the results of real operation. The maximum approximation of the simulation modelling results in Matlab Simulink to real operation is explained by taking into account a sufficient number of factors influencing durability. This research has the particularity that it allows determining the durability of the bus body even at the design stage, which was not possible with accelerated tests or during the operation of the bus on real routes. The obtained results can be used by bus manufacturers at the design stage, allowing them to change the construction and technology of anticorrosion protection, thereby influencing the durability. In addition, operating organizations will be interested in the obtained results when using the developed methodology in various operating conditions.

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Mathematical Model of Forecasting Durability of Bus Bodies and Checking it for Adequacy

Cited by 3 publications

References 1 publication

Forecasting the durability of public transport bus bodies depending on operating conditions

Forecasting the durability of public transport bus bodies depending on operating conditions

Devising an approach to assessing the durability of bus body on a frame chassis

Predictive Assessment of Bus Body Life in the Matlab Simulink Software Environment

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