Numerical study on the influence of suspended equipments on the ride comfort in high speed railway vehicles

Abstract

To study how the suspended equipments impact the carbody flexible vibrations in a high speed railway vehicle and the ride comfort, a rigid flexible general model of such vehicle is required. The numerical simulations rely on three distinct models, derived from the general model of the vehicle, namely a reference model with no equipment, a simplified model with one equipment mounted at the carbody centre and another model considering four equipments mounted in various positions along the carbody. The intent of this paper arises from the observation that the literature review does not feature any study to highlight the change in the ride comfort, exclusively due to the equipments. Similarly, there is no mention on contrasting the ride comfort results obtained from the simplified model versus the ones coming from the model with more equipments.The characteristics of the carbody flexible vibration due to the suspended equipments are made visible by comparing the frequency response functions between the no equipment and the one equipment models. The influence of the suspended equipments on the ride comfort is established by a contrastive examination of the ride comfort index calculated with one/four equipment models with the same index from the no equipment model.

The influence of engine gyroscopic moments on vehicle transient handling

“…By placing vector of forces and torques in equation (23) for the proposed vehicle model, equation ( 24) is obtained:…”

“…Rubin and Arogeti 22 used 10-DOF vehicle simulation model under road conditions to study on the yaw stability. Dumitriu 23 investigated the effect of suspended equipment on the ride comfort and dynamic behavior of the vehicle by the numerical simulations. Moreover, basic researches of computer simulations and vehicle dynamics have been placed in Refs.…”

Influence of Structural Stiffness and Loss Factor on Railroad Vehicle Comfort

“…For instance, despite the fact that connected cars influence the vertical dynamics of one another, the inclusion of all cars in the models may obscure the basic connection between comfort and structural stiffness. Most simplified studies, such as the one presented in this paper, consider a single isolated car on two trucks or bogies [1][2][3][4][5][6][7][8][9]. Our case, however, differs in that it focuses on vehicles in which consecutive cars share either a bogie or a yoke with independent wheels (such as the configurations patented by the Spanish manufacturer "Talgo").…”

Research of the Reduced Mass of the Railway Track

“…The displacement of centers of mass at each time step in system solution of differential equations is the result of the simulation, which makes it possible to obtain forces, stresses, and other necessary motion parameters. Such an approach describes the dynamic processes of rolling stock with adequacy sufficient for almost the entire list of relevant modern tasks [1,2,3,4,5,6], etc. Certain difficulties arise when introducing a railway track into such models.…”