Wyniki wyszukiwania - BazTech

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Improving the efficiency of transporting lightweight bulky cargo by motor transport

Gogiashvili Phridon, Kirtadze Shalva, Lekveishvili Gocha, Kbilashvili David, Chogovadze Jumber, Sirbiladze Besik

Transport Problems

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2023

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T. 18, z. 4

147--159

EN

The shipping process should be carried out to minimize standing time, as it affects the total vehicle mileage. The efficiency of distributing cargo on routes in modern conditions could be achieved by transporting cargo taken from several manufacturers that have mutually comparable mileages. This paper analyzes common methods of cargo distribution by routes. It was established that the approximate methods that provide near- optimal solutions to problems have become widespread. Therefore, there is no alternative to using accurate methods in the process of studying the routing problem. One such method is the branch-and-bond method. It should also be noted that it does not involve going to the same place multiple times, which takes place in a real transport scheme. Thus, the modification of accurate methods is a promising direction in solving the routing problem in the process of transporting the goods in small consignments. Consequently, this provides an opportunity to effectively use motor transport in the logistic system.

2

Studying the dynamic system “tire-suspension-body” by the resonance method

Gogiashvili Phridon, Kbilashvili David, Chogovadze Jumber, Lekveishvili Gocha, Sirbiladze Besik

Transport Problems

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2022

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T. 17, z. 1

63--72

EN

By comparing the results of a pilot study of the damping coefficient of a pneumatic tire carried out on a test bench, this study justifies the possibility of using the less time-consuming experimental resonance curve method instead of the dynamic loop method. A mathematical model of the vertical oscillations of a vehicle’s dynamic system “pneumatic wheel-suspension-sprung weight”was created on the test-bench, and an image of the amplitude-frequency characteristic of the sprung weight oscillation was obtained. The approaches and results of the pilot and analytical studies presented in the article aid the selection of the tire with the best damping properties. The use of the experimental resonance curve method to determine the damping characteristic of a vehicle’s tire is limited in the external frequency range of the resonant frequencies. In this case, we have to use the dynamic loop method.

3

Mathematical modeling of the motion parameters of a disabled person in a bus

Chogovadze Jumber, Gogiashvili Phridon, Lekveishvili Gocha, Kbilashvili David, Mardaleishvili Nodar

Transport Problems

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2020

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T. 15, z. 1

49--59

EN

With a view to determining the dynamics and possible trauma sustained by a disabled person in a wheelchair in the passenger compartment of a bus, a physical model has been developed. The system, as the time function, generalized in the coordinates X(t), (t), was described by second-order Lagrangian differential equations. The proposed mathematical model allows for determining the motion characteristics of disabled people in a wheelchair in a bus that can cause injuries. This paper presents the curves of the change in coordinates of the angular velocity of the head and its center of gravity, as well as the curve of the change in the angle between the femur and the wheelchaior seat, through mathematical modeling and an experiment.

4

Optimizing the time costs of passenger transport of people with disabilities

Gogiashvili Phridon, Chogovadze Jumber, Lekveishvili Gocha, Kbilashvili David, Sirbiladze Besik, Dograshvili Vazha

Transport Problems

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2019

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T. 14, z. 2

123--133

EN

The paper dwells on a mathematical model of the logistical system of transport services for persons with disabilities, and there have been analyzed factors that affect the time spent on their transportation. When developing methodology for optimizing the time costs of passenger transport of persons with disabilities, the following two basic transportation services have been taken into account: (a) "social taxi", which will transport only people with special health; (b) a vehicle system in combination with urban passenger transport, which will transport representatives of the group of people with restricted mobility together with all other passengers. The study found that in the case of insufficient accessibility to the required environment, by the increase in the demand of disabled people for transportation by "social taxi", travelling costs are increased that results in increasing total costs of the carrier. Based on a comparative analysis of logistical costs, optimum relationship between the number of the adapted buses and “social taxi” on the route under study has been established.