Simulation of Quarter-Car Model with Magnetorheological Dampers for Ride Quality Improvement

Proceedings of the Institution of Mechanical Engineers, Part K:

2018

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In this paper, longitudinal train dynamics and coupler forces were modelled based on experimental results of Research Design and Standard Organisation and from the available literature. The model was solved numerically in MATLAB. Moreover, a multibody model was developed in Universal Mechanism software considering a locomotive and two coaches that were validated with the mathematical model by comparing acceleration responses of locomotives and coaches running at 150 km/h and then applying emergency braking. The validated model in the Universal Mechanism software was extended and used for additional study. For the case study, the Rajdhani Express train was considered running at its maximum operational speed of 160 km/h with track gradient of New Delhi and Agra Cantt station. The performance of the rail vehicle in five braking phases was evaluated. The maximum compression force in coupler increased after the application of each brake phase. Moreover, the maximum compressive coupler force of 149 t was experienced at the third quarter of the train. However, the ride quality and comfort were within the satisfactory range prescribed by Research Design and Standard Organisation.

Section: Comparison Between Multibody Model and Mathematical Modelmentioning

confidence: 61%

Multibody analysis of longitudinal train dynamics on the passenger ride performance due to brake application

Proceedings of the Institution of Mechanical Engineers, Part K:

2018

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“…Modal analysis is employed to solve the linear system's motion equations without damping and to find the system's natural frequency [48][49][50]. Analytical approaches could not precisely determine the natural frequency due to the complicated construction of the CB [37,[51][52][53][54][55][56][57][58][59][60][61][62]. However, finite element methods might be used to solve it [3].…”

Section: Modal Analysis Of the Car Bodymentioning

confidence: 99%

Numerical and Experimental Analysis of DVA on the Flexible-Rigid Rail Vehicle Carbody Resonant Vibration

Lee

et al. 2022

Sensors

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This paper examines the influence of the equipment considered as a DVA (Dynamic Vibration Absorber) upon the mode of vertical vibrations of the car body in high-speed vehicles. The car body is represented as an Euler-Bernoulli beam to minimize flexible vibration. The DVA approach is used to find the appropriate suspension frequencies for various types of equipment. A vertical mathematical model with a flexible car body and equipment is developed to investigate the effect of equipment mass, suspension stiffness, damping, and mounting location on car-body flexible vibrations. A three-dimensional, rigid-flexible coupled vehicle system dynamics model is developed to simulate the car body and equipment’s response to track irregularities. The experimental result was considered to verify the theoretical analysis and dynamic simulation. The mathematical analysis demonstrates that the DVA theory can be used to design the suspension parameters of the equipment and that it is suitable and effective in reducing the flexible vibration of the car body in which the vertical bending mode is greatly affected. Heavy equipment should be mounted as close to the car body’s center as possible to achieve significant flexible vibration reduction, whereas light equipment contributes very little flexible vibration reduction.

“…4,21 It is also a well-known fact that higher equivalent conicity has a destabilizing effect on wheelaxle therefore its value needs to be selected considering all aspects. [22][23][24][25][26][27] The variation of wheelaxle lateral displacement with equivalent conicity is shown in Figure 19.…”

Section: Influence Of Critical Parameters On Ridementioning

confidence: 99%

Analysis of generalized force and its influence on ride and stability of railway vehicle

Noise & Vibration Worldwide

et al. 2020

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Formulation of a rail vehicle model using Lagrange’s method requires the system’s kinetic energy, potential energy, spring potential energy, Rayleigh’s dissipation energy and generalized forces to be determined. This article presents a detailed analysis of generalized forces developed at wheel–rail contact point for 27 degrees of freedom–coupled vertical–lateral model of a rail vehicle formulated using Lagrange’s method and subjected to random track irregularities. The vertical–lateral ride comfort of the vehicle and the ride index of the vehicle are evaluated based on ISO 2631-1 comfort specifications and stability is determined using eigenvalue analysis. The parameters that constitute the generalized forces and critically influence ride and stability have been identified and their influences on the same have been analysed in this work.