Road train motion stability in BRT system

Abstract

The peculiarities of organization and perspectives of mass passenger transportation in the city and beyond are considered with the use of "Bus Rapid Transport" (BRT) or Metrobus. Different aspects of study of motor vehicles (MV) controllability and stability are analyzed. It is substantiated that it is sufficient to consider the potential stability of the MV itself, in order to guarantee the stability of the "driver MV" system with a large reserve. A mathematical model of a three-axle bus train consisting of a bus and two trains (metrobus) is developed and the factors influencing the critical speed as the main index of the stability of its movement are determined. It is established that the increase of the critical speed of the metrobus can be achieved by increasing the base of the bus, the first and the second trailer, as well as the mass of the bus and the coefficients of resistance of the drive wheels of the bus driving axle and the trailers axles. At the same time, increasing the distance from the mass center to the bus rear axle, increasing the distance from the mass center to the point of the coupling of the bus with the first trailer, increasing the mass of trailers and the resistance of the resistance of the wheel drive of the bus axis lead to a decrease in the critical speed of the metrobus. This must be taken into account both when designing metrobuses, and when operating them.

Influence of the Technical Condition of the Running System of Articulated Buses on Stability of Their Straight-Line Motion

“…To solve the problem of stability of rectilinear motion of a road train it is necessary to make a system of equations of its perturbed motion. This system allows to determine the reactions of the links of the road train in a single disturbance (a sharp turn of the steering In [14], a system of equations describing the plane-parallel motion of an articulated bus was obtained. This system is written as: • for the bus ; ;…”

“…In [13][14][15] a complex method of choosing the parameters of a road train was developed, based on mathematical models of its rectilinear and controlled motion, taking into account the angles of installation of the axles of a tractor and a semi-trailer. It is shown that the movement of a road train, consisting of a two-axle tractor and a three-axle semi-trailer, without the skew axles, is asymptotically stable.…”

To the question of the stability of the metro in the brake mode

“…У роботі [8] отримано систему диференціальних рівнянь, що описує плоскопаралельний рух ланок триланкового шарнірно-зчленованого автобуса, рис. 1.…”

Avaliação Do Projeto De Infraestrutura Do BRT No Estado Do Rio De Janeiro

“…De acordo com a Administração Federal de Trânsito (AFT), é um sistema de trânsito que pode incluir prioridade de semáforos, plataformas elevadas e estações melhoradas (V. Perk, Catalá, Mantius, & Corcoran, 2017). O consideram um sistema de tráfego de ônibus bastante complexo, porque envolve a circulação de ônibus em ônibus especialmente designados e, muitas vezes, em faixas de tráfego cercadas (Sakhno et al, 2019). Algumas das definições possíveis estão relacionadas ao seu desempenho e modo de operação como parte de um sistema de transporte público, conforme descrito em Dantas, Dantas, Melo, Maciel, and Alves (2018) considerando que o veículo percorre uma única rota entre um conjunto de estações, tendo como ponto de partida uma estação central e o destino do veículo como estação final (Dantas et al, 2021).…”

“…Esse sistema se tornou uma solução de trânsito popular para cidades que desejam otimizar a mobilidade urbana e as oportunidades e eficiências econômicas por meio da melhoria do valor do solo e da propriedade (Zhang & Yen, 2020). Bem como um excelente auxiliar na resolução de problemas ecológicos e de transporte, com um curto tempo de implementação (Sakhno et al, 2019) (Kassens-Noor, Gaffney, Messina, & Phillips, 2018). No entanto, esses benefícios podem variar muito em uma área urbana para outra, dependendo das características da rede (Wirasinghe et al, 2013).…”