Sensitivity Analysis of Ride Behaviour of Indian Railway Rajdhani Coach using Lagrangian Dynamics

Sharma, Rakesh Chandmal

doi:10.4273/ijvss.5.3-4.02

Cited by 12 publications

(3 citation statements)

References 14 publications

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“…For an arbitrary acceleration signal, which was not necessarily a harmonic signal, the frequency-weighted root mean square value of accelerations (a wrms ) should be used. The original mathematical expression, introduced by Sperling is given in Equation ( 12) [17]. The rail vehicle was accessed on Sperling's ride evaluation scales mentioned in Table 4, in order to judge the ride quality.…”

Section: Sperling Ride Quality Indexmentioning

confidence: 99%

Impact of electric locomotive traction of the passenger vehicle Ride quality in longitudinal train dynamics in the context of Indian railways

Sharma

Kumar

2017

Mechanics & Industry

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Rail transport is one of the major modes of transportation in India. The dynamic performance of a railway vehicle, in terms of serviceability and safety, was evaluated on the basis of specific performance indices such as ride quality and comfort. This paper is an attempt to analyse the longitudinal dynamic model of the passenger train for the attainment of better vehicle ride quality and comfort. The modelling has been done in two phases: in the first phase, a mathematical model was analysed which was further used for the evaluation of the longitudinal dynamic forces that appear on the buffer, draw gear and fastening devices during the braking process. The second phase includes simulation of longitudinal train dynamics considering the effects of forces like rolling resistance, brake force, coupler force and the gravitational force acting externally on a vehicle for better ride quality and comfort in comparison to the traction effect on WAP-5 and WAP-7 Indian locomotives. The Sperling ride index and ISO 2631 were used respectively to calculate the ride quality and comfort using filtered RMS accelerations. Simulation results revealed that WAP-5 was better at an initial speed of 30 km.h −1 and 45 km.h −1 , whereas, the WAP-7 gave better ride quality and comfort than WAP-5 at and above the speed of 60 km.h −1 .

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Section: Sperling Ride Quality Indexmentioning

confidence: 99%

Impact of electric locomotive traction of the passenger vehicle Ride quality in longitudinal train dynamics in the context of Indian railways

Sharma

Kumar

2017

Mechanics & Industry

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“…Nowadays mechanical and vehicle engineering tasks can also be solved effectively with sensitivity study [10]- [16]. For example the comfort of a railway vehicle could be increased with sensitivity study of masses and damping coefficients [14].…”

Section: Introductionmentioning

confidence: 99%

Testing output variables for sensitivity study of nonlinear vibration systems

Hajdú

Molnárka

2020

Pollack Periodica

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Abstract:In this study the detailed One-at-a-Time sensitivity analysis of nonlinear mass spring-damper systems is carried out with numerical simulation. The degree of sensitivity was measured with a sensitivity index and based on its sensitivity Fuzzy-sets were established. The sensitivity of a parameter then can be expressed by the membership to the Fuzzy-sets. In this study the root mean square of acceleration, the maximum amplitude of acceleration and the peak frequency were chosen as output variables to measure sensitivity. With this research it was proven, that the root mean square of acceleration and the peak frequency can be used for sensitivity study of nonlinear vibration systems effectively.

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“…Ride comfort is always dynamically controlled in terms of vertical and lateral responses. Sharma (2013) described that vertical track irregularities are the major source of an excitation and responsible for vertical and lateral vibrations in a high-speed train. To augment ride comfort, factors such as coupled degrees of freedom (DOF), optimal suspension and dampers, and sprung and un-sprung masses including track profile are the prime concern.…”

Section: Introductionmentioning

confidence: 99%

Optimization of dynamically sensitive parameters of Linke Hofmann Busch coach considering suspended equipment using design of experiment

Singh¹,

Mathur

Srivastava

2019

Journal of Vibration and Control

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The high speed coach running on irregular track is always accompanied by inferior comfort for the passengers. The optimal design of coach parameters improving comfort level can be achieved through response analysis. The present study is concerned with the optimization of Linke Hofmann Busch rail coach design parameters to augment comfort level. The coach body and bogie frame under four degrees of freedom are modeled with the finite element method to obtain dynamic parameters of the coach, that is, eigenvalues and eigenvectors. The sensitivity analysis based on partial derivatives against frequency response function displacement with respect to various design parameters is conducted, and most influential coach parameters are optimized through computer experimentation using central composite design and response surface methodology of design of experiment (DOE). Using modal parameters obtained as above and Indian Rail Road power spectral density of track irregularities, both vertical and lateral responses are determined at vicinity to the center mass of coach body in a 0.1– 40 Hz frequency range of interest. Results conclude that peak vertical responses occur in 0 – 10 Hz, whereas peak lateral responses fall at still lower frequency representing long wavelength irregularities of track that causes discomfort to vehicle riders. Findings of the research work embodied herein reveal that the left end bio toilet tank mass has least effect on response. Also, these findings suggest scope for further attainment in comfort level by computer experimentation for combinations of three coach design parameters (wheel base, equivalent primary, and secondary suspension stiffness) on minimizing the response level without altering the basic design of the coach model. The present paper represents a significant move forward on the dynamic analysis of coach body considering suspended equipment, sensitivity analysis through mathematical approach rather than step parametric variation, and its optimization through DOE, which have not been addressed earlier. The outcome of the paper may help rail coach designers to modify coach design parameters for better comfort level, even in the low frequency range of operation.

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Sensitivity Analysis of Ride Behaviour of Indian Railway Rajdhani Coach using Lagrangian Dynamics

Cited by 12 publications

References 14 publications

Impact of electric locomotive traction of the passenger vehicle Ride quality in longitudinal train dynamics in the context of Indian railways

Impact of electric locomotive traction of the passenger vehicle Ride quality in longitudinal train dynamics in the context of Indian railways

Testing output variables for sensitivity study of nonlinear vibration systems

Optimization of dynamically sensitive parameters of Linke Hofmann Busch coach considering suspended equipment using design of experiment

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