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B. Bhattacharya - One of the best experts on this subject based on the ideXlab platform.

  • A Parametric Study Analysing the Effect of Bolster Suspension Parameters on the Carbody Dynamic Response in a Freight Wagon Fitted with Three-Piece Bogie
    Journal of Vibration Engineering & Technologies, 2019
    Co-Authors: M. Pandey, B. Bhattacharya
    Abstract:

    Background The carbody of a rail vehicle has different natural frequencies in empty and Loaded Conditions in different fundamental vibration modes. Moreover, the vertical and lateral track excitation in vertical and lateral directions have several dominant frequency modes. In the case of a freight wagon fitted with three-piece freight bogie, the problem of suspension design is more challenging. The lateral stiffness of the bolster springs is dependent on load, as well as to the spring group height. The damping force is load dependent and is dependent on stiffness/deflection of the bolster springs, the stiffness of the friction control spring (snubber springs) and the coefficient of friction between the surface of the wedge block and the side frame/bolster. There is large variation between the tare weight and the gross weight. Method This paper attempts to analyse the effect of different bolster suspension parameters of a three-piece bogie on the freight carbody dynamic responses in various modes. Multibody models in New and Untried Cars Analytic Regime Simulation (NUCARS) consisting of eleven bodies and seventy connections have been used for the study. The models for empty and Loaded wagon contain forty-nine degrees and fifty-two degrees of freedom, respectively. Attempts have been made to validate the simulation models as per the methodology provided by the EN 14363:2016 standard. Effect of 36 bolster suspension combinations has been analysed. Results Snubbing force plays a very important role in the dynamic response analysis. The simulation study suggests that the choice of wedge friction coefficient is challenging as it is affecting the dynamic responses in various modes differently. High coefficient of friction is adversely affecting the vertical and lateral dynamic responses in empty Condition and lateral dynamic response in Loaded Condition. But it is favourably affecting the vertical response in Loaded Condition. Increase in lateral stiffness is found to be affecting the lateral dynamic response adversely. Selection of the bogie vertical stiffness is very much involved. Conclusion The optimisation of carbody dynamic response for a freight wagon fitted with three-piece bogie can be formulated as a many-objective optimisation problem wherein four of the representative dynamic response acceleration modes, i.e. vertical acceleration on straight track in empty and Loaded Condition, lateral acceleration on 2° curve in empty and Loaded Condition, may be selected as objective functions.

  • A Parametric Study Analysing the Effect of Bolster Suspension Parameters on the Carbody Dynamic Response in a Freight Wagon Fitted with Three-Piece Bogie
    Journal of Vibration Engineering & Technologies, 2019
    Co-Authors: M. Pandey, B. Bhattacharya
    Abstract:

    The carbody of a rail vehicle has different natural frequencies in empty and Loaded Conditions in different fundamental vibration modes. Moreover, the vertical and lateral track excitation in vertical and lateral directions have several dominant frequency modes. In the case of a freight wagon fitted with three-piece freight bogie, the problem of suspension design is more challenging. The lateral stiffness of the bolster springs is dependent on load, as well as to the spring group height. The damping force is load dependent and is dependent on stiffness/deflection of the bolster springs, the stiffness of the friction control spring (snubber springs) and the coefficient of friction between the surface of the wedge block and the side frame/bolster. There is large variation between the tare weight and the gross weight. This paper attempts to analyse the effect of different bolster suspension parameters of a three-piece bogie on the freight carbody dynamic responses in various modes. Multibody models in New and Untried Cars Analytic Regime Simulation (NUCARS) consisting of eleven bodies and seventy connections have been used for the study. The models for empty and Loaded wagon contain forty-nine degrees and fifty-two degrees of freedom, respectively. Attempts have been made to validate the simulation models as per the methodology provided by the EN 14363:2016 standard. Effect of 36 bolster suspension combinations has been analysed. Snubbing force plays a very important role in the dynamic response analysis. The simulation study suggests that the choice of wedge friction coefficient is challenging as it is affecting the dynamic responses in various modes differently. High coefficient of friction is adversely affecting the vertical and lateral dynamic responses in empty Condition and lateral dynamic response in Loaded Condition. But it is favourably affecting the vertical response in Loaded Condition. Increase in lateral stiffness is found to be affecting the lateral dynamic response adversely. Selection of the bogie vertical stiffness is very much involved. The optimisation of carbody dynamic response for a freight wagon fitted with three-piece bogie can be formulated as a many-objective optimisation problem wherein four of the representative dynamic response acceleration modes, i.e. vertical acceleration on straight track in empty and Loaded Condition, lateral acceleration on 2° curve in empty and Loaded Condition, may be selected as objective functions.

M. Pandey - One of the best experts on this subject based on the ideXlab platform.

  • A Parametric Study Analysing the Effect of Bolster Suspension Parameters on the Carbody Dynamic Response in a Freight Wagon Fitted with Three-Piece Bogie
    Journal of Vibration Engineering & Technologies, 2019
    Co-Authors: M. Pandey, B. Bhattacharya
    Abstract:

    Background The carbody of a rail vehicle has different natural frequencies in empty and Loaded Conditions in different fundamental vibration modes. Moreover, the vertical and lateral track excitation in vertical and lateral directions have several dominant frequency modes. In the case of a freight wagon fitted with three-piece freight bogie, the problem of suspension design is more challenging. The lateral stiffness of the bolster springs is dependent on load, as well as to the spring group height. The damping force is load dependent and is dependent on stiffness/deflection of the bolster springs, the stiffness of the friction control spring (snubber springs) and the coefficient of friction between the surface of the wedge block and the side frame/bolster. There is large variation between the tare weight and the gross weight. Method This paper attempts to analyse the effect of different bolster suspension parameters of a three-piece bogie on the freight carbody dynamic responses in various modes. Multibody models in New and Untried Cars Analytic Regime Simulation (NUCARS) consisting of eleven bodies and seventy connections have been used for the study. The models for empty and Loaded wagon contain forty-nine degrees and fifty-two degrees of freedom, respectively. Attempts have been made to validate the simulation models as per the methodology provided by the EN 14363:2016 standard. Effect of 36 bolster suspension combinations has been analysed. Results Snubbing force plays a very important role in the dynamic response analysis. The simulation study suggests that the choice of wedge friction coefficient is challenging as it is affecting the dynamic responses in various modes differently. High coefficient of friction is adversely affecting the vertical and lateral dynamic responses in empty Condition and lateral dynamic response in Loaded Condition. But it is favourably affecting the vertical response in Loaded Condition. Increase in lateral stiffness is found to be affecting the lateral dynamic response adversely. Selection of the bogie vertical stiffness is very much involved. Conclusion The optimisation of carbody dynamic response for a freight wagon fitted with three-piece bogie can be formulated as a many-objective optimisation problem wherein four of the representative dynamic response acceleration modes, i.e. vertical acceleration on straight track in empty and Loaded Condition, lateral acceleration on 2° curve in empty and Loaded Condition, may be selected as objective functions.

  • A Parametric Study Analysing the Effect of Bolster Suspension Parameters on the Carbody Dynamic Response in a Freight Wagon Fitted with Three-Piece Bogie
    Journal of Vibration Engineering & Technologies, 2019
    Co-Authors: M. Pandey, B. Bhattacharya
    Abstract:

    The carbody of a rail vehicle has different natural frequencies in empty and Loaded Conditions in different fundamental vibration modes. Moreover, the vertical and lateral track excitation in vertical and lateral directions have several dominant frequency modes. In the case of a freight wagon fitted with three-piece freight bogie, the problem of suspension design is more challenging. The lateral stiffness of the bolster springs is dependent on load, as well as to the spring group height. The damping force is load dependent and is dependent on stiffness/deflection of the bolster springs, the stiffness of the friction control spring (snubber springs) and the coefficient of friction between the surface of the wedge block and the side frame/bolster. There is large variation between the tare weight and the gross weight. This paper attempts to analyse the effect of different bolster suspension parameters of a three-piece bogie on the freight carbody dynamic responses in various modes. Multibody models in New and Untried Cars Analytic Regime Simulation (NUCARS) consisting of eleven bodies and seventy connections have been used for the study. The models for empty and Loaded wagon contain forty-nine degrees and fifty-two degrees of freedom, respectively. Attempts have been made to validate the simulation models as per the methodology provided by the EN 14363:2016 standard. Effect of 36 bolster suspension combinations has been analysed. Snubbing force plays a very important role in the dynamic response analysis. The simulation study suggests that the choice of wedge friction coefficient is challenging as it is affecting the dynamic responses in various modes differently. High coefficient of friction is adversely affecting the vertical and lateral dynamic responses in empty Condition and lateral dynamic response in Loaded Condition. But it is favourably affecting the vertical response in Loaded Condition. Increase in lateral stiffness is found to be affecting the lateral dynamic response adversely. Selection of the bogie vertical stiffness is very much involved. The optimisation of carbody dynamic response for a freight wagon fitted with three-piece bogie can be formulated as a many-objective optimisation problem wherein four of the representative dynamic response acceleration modes, i.e. vertical acceleration on straight track in empty and Loaded Condition, lateral acceleration on 2° curve in empty and Loaded Condition, may be selected as objective functions.

Vladimi Jaric - One of the best experts on this subject based on the ideXlab platform.

  • calculation of unbalanced magnetic pull in a salient pole synchronous generator using finite element method and measured shaft orbit
    IEEE Transactions on Industrial Electronics, 2012
    Co-Authors: Dami Zarko, Drago A, I Vazda, Vladimi Jaric
    Abstract:

    In this paper, the unbalanced magnetic forces which act upon the rotor of a salient-pole synchronous generator due to eccentric motion of the rotor shaft in the presence of magnetic field in no-load and Loaded Condition are calculated using the finite-element method. The displacement of the rotor is modeled using the actual shaft orbit measured on a 5-MVA salient-pole generator driven by a gas turbine in a cogeneration plant. The influences of the stator winding parallel paths and the rotor damper winding on attenuation of unbalanced magnetic pull are analyzed using the finite-element method. It is shown that under linear Conditions the correlations between separate harmonic components of the shaft orbit, the resulting harmonic components of the unbalanced magnetic pull and the induced stator winding currents can be established in both the no-load and Loaded Condition.

Liang Zhao - One of the best experts on this subject based on the ideXlab platform.

  • Integrated Tolerancing and Motion Error Analysis of Suspension Assembly Considering Local Deformation in Suspension Shock Tower
    Volume 2: Advanced Manufacturing, 2017
    Co-Authors: Hua Wang, Liang Zhao
    Abstract:

    The suspension spring compression introduce local deformation in the suspension shock tower, and it brings the imprecision or uncertainty of the computer aided tolerancing (CAT) results of the suspension assembly. This work presents an integrated tolerancing and motion error analysis method of suspension assembly to consider the local deformation in the suspension shock tower. Tolerancing model of the suspension assembly is constructed in CAT software. FEA model provides the local deformation in the suspension shock tower introduced by the suspension spring compression under full Loaded Condition. The local deformation is represented with the modified probability distribution function (PDF) of the joining point between the suspension and the suspension shock tower. The modified PDFs of the joining points, together with the manufacturing deviations of the suspension parts are input to the constructed tolerancing model. The results are obtained that the final assembly variations of the suspension assembly under empty and full Loaded Conditions. Based on the tolerancing results, motion errors of the suspension from empty Condition to full Loaded Condition are analyzed with the ADAMS model of the suspension. The results have shown that tolerancing and motion error analysis results considering the local deformation in suspension shock tower are more accurate than the initial normal distribution. The tolerancing and motion error analysis work presented in the paper will enhance the understanding of the suspension assembling, and help systematically improving the precision control efficiency in automobile industry.

Satish Chandra Jain - One of the best experts on this subject based on the ideXlab platform.

  • The Torque Simulation of Synchronous Generator Under Loaded Condition for Different Types of Electrical Disturbances
    2018 2nd International Conference on Power Energy and Environment: Towards Smart Technology (ICEPE), 2018
    Co-Authors: Tarun Kumar, Abhishek Bangunde, Rajeev Kumar, Satish Chandra Jain
    Abstract:

    In this paper, the torque developed in the synchronous generator under the Loaded Condition is numerically simulated for various types of electrical faults. The dq0 approach is used to model synchronous generator connected to an infinite bus. The Adams fourth order predictor-corrector method with starter as fourth order Runge-Kutta method is used to numerically simulate the torque developed by the synchronous generator connected to load using MATLAB. The numerical results revealed that electromagnetic torque is most severe in synchronization fault followed by three phase fault, line to ground fault and line to line fault.