Describing Function Techniques for the Non-Linear Analysis of the Dynamics of a Rail Vehicle Wheelset

Garg, Devendra P.; John A. Volpe National Transportation Systems Center, (U.S.)

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Describing Function Techniques for the Non-Linear Analysis of the Dynamics of a Rail Vehicle Wheelset

1975-07-01
By Garg, Devendra P.

[PDF-2.37 MB]

English

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Creators:

Garg, Devendra P.
Corporate Creators:

John A. Volpe National Transportation Systems Center, (U.S.)
Corporate Contributors:

United States. Federal Railroad Administration
Subject/TRT Terms:

[+]

Critical Velocity Dynamics Hunting (Dynamics) Lateral Dynamics Mathematical Models Rail (Railroads) Railroad Cars Train Track Dynamics Trucks Wheels Wheelsets (Railroads)
Publication/ Report Number:

DOT-TSC-FRA-75-6 ; FRA-OR&D-75-83

DOT-TSC-FRA-75-6 ; FRA-OR&D-75-83 Less -
Resource Type:

Tech Report
Geographical Coverage:

United States
Edition:

Interim Report; Jul 1974-Feb 1975
Corporate Publisher:

United States. Federal Railroad Administration
NTL Classification:

NTL-SAFETY AND SECURITY-Rail Safety;NTL-SAFETY AND SECURITY-Vehicle Design;NTL-RAIL TRANSPORTATION-RAIL TRANSPORTATION;NTL-RAIL TRANSPORTATION-Rail Safety;
Abstract:

The describing function method of analysis is applied to investigate the influence of parametric variations on wheelset critical velocity. In addition, the relationship between the amplitude of sustained lateral oscillations and critical speed is derived. The non-linearities in the model include the difference in rolling radii as a function of lateral displacement of the wheelset from its mean position, profile conicity, and gravitational stiffness in the lateral and yaw directions. The proposed method is validated by applying it to a wheelset example cited in the literature. Comparable results are obtained using the proposed technique. The describing function method presented in the report is quite general and is applicable to dynamic models exhibiting severe non-linear characteristics in profile. Critical speed, frequency of limit cycles, gravitational force, effective conicity, gravitational stiffness and creepage, etc., can be easily computed using the proposed algorithm.
Format:

PDF
Funding:

RR515/R5301
Collection(s):

Volpe Center
Main Document Checksum:

[+]

urn:sha256:b289a78d60407d4e82b9a63de4e672f12376e9bb974336728ad99f36e8b9ee23
Download URL:

https://rosap.ntl.bts.gov/view/dot/10313/dot_10313_DS1.pdf
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Describing Function Techniques for the Non-Linear Analysis of the Dynamics of a Rail Vehicle Wheelset

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