Abstract
This paper considers the influence of the transitional modes of movement (acceleration, braking) of a multi-link vehicle on the vibration protection of transported non-fixed or partially fixed cargoes. The impact phenomenon, in this case, can be strengthened by the existence of coupling mechanisms between the links of a multi-link vehicle. To reduce such horizontal impact loads, it is advisable to use elements with viscoelastic damping in the coupling devices of a multi-link vehicle. To study the actual impact phenomena during the transportation of non-fixed or partially fixed cargoes under the extreme modes of movement of two-link vehicles, it is proposed to use a flat two- and three-mass dynamic model with viscoelastic damping. At the same time, the theory of elastic impact has been applied while the elastic-damping characteristics of vehicles' suspensions were not taken into consideration. It has been shown that the reported research results make it possible to estimate the approximate values of the mechanical parameters for restrictive devices that protect non-fixed or partially fixed cargoes from impact, during the transition modes of transportation, depending on the conditions of motion. This practically makes it possible to select the rational design parameters for the elements of viscoelastic restrictive devices, in particular elastic elements and dampers, in order to reduce impact loads on non-fixed heavy cargoes during transportation under extreme modes of movement. Based on this study, a procedure of vibration protection of non-fixed or partially fixed cargoes in the body of a two-link vehicle during its uneven movement has been proposed, which implies determining the maximum dynamic loads on these cargoes as well as the possibility of choosing the rational design parameters for restrictive devices in order to prevent or reduce the impact of these cargoes hitting the restrictive devices
Highlights
Transporting non-fixed heavy cargoes by vehicles may be accompanied by the cargoes hitting their restrictive devices
The purpose of this work is to investigate the possible impact of heavy non-fixed or partially fixed cargoes against restrictive devices during their transportation under transition modes of movement by multi-link vehicles, in order to determine the amount of dynamic loads on these cargoes and on the vehicles themselves
When a vehicle moves under transition modes, nonfixed or partially fixed cargoes on the trailer begin to move due to the forces of inertia, overcoming the friction forces between the cargo and the body of the trailer
Summary
Transporting non-fixed heavy cargoes by vehicles (road trains, railroad freight trains, container trucks, trailers, plate trucks, etc.) may be accompanied by the cargoes hitting their restrictive devices (body’s boards, wagon walls, etc.). Another issue relates to the transportation of fragile, explosive, chemically, bacteriologically dangerous articles. The impact phenomena that occur during the transportation of non-impact-resistant cargoes, under the extreme modes of movement (sharp acceleration and braking) have not been studied in detail This is especially evident in the case of cargo transportation by multi-link vehicles. Eastern-European Journal of Enterprise Technologies ISSN 1729-3774 2/7 ( 110 ) 2021 There are such structures of damping and vibration devices that reduce dynamic loads on cargoes. Their use is predominantly random, not always justified, and, often ineffective
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