Effect of elasto-plasticity on the creep force characteristics and the railway vehicle stability

2016 ◽  
pp. 1016-1025 ◽  
Keyword(s):  
Railway Vehicle ◽  
Vehicle Stability ◽  
Elasto Plasticity ◽  
Creep Force ◽  
Force Characteristics

scholarly journals Applying Two Simplified Ellipse-Based Tangential Models to Wheel-Rail Contact Using Three Alternative Nonelliptic Adaptation Approaches: A Comparative Study

2019 ◽  
Vol 2019 ◽  
pp. 1-17 ◽  
Author(s):  
Boyang An ◽  
Ping Wang ◽  
Jiayi Zhou ◽  
Rong Chen ◽  
Jingmang Xu ◽  
...  
Keyword(s):  
Comparative Study ◽  
Computational Cost ◽  
Rolling Contact ◽  
Railway Vehicle ◽  
Normal Contact ◽  
Tangential Contact ◽  
Track Dynamics ◽  
Contact Models ◽  
Creep Force

In the modeling of railway vehicle-track dynamics and wheel-rail damage, simplified tangential contact models based on ellipse assumption are usually used due to strict limitation of computational cost. Since most wheel-rail contact cases appear to be nonelliptic shapes, a fast and accurate tangential model for nonelliptic contact case is in demand. In this paper, two ellipse-based simplified tangential models (i.e., FASTSIM and FaStrip) using three alternative nonelliptic adaptation approaches, together with Kalker’s NORM algorithm, are applied to wheel-rail rolling contact cases. It aims at finding the best approach for dealing with nonelliptic rolling contact. Compared to previous studies, the nonelliptic normal contact solution in the present work is accurately solved rather than simplification. Therefore, it can avoid tangential modeling evaluation affected by inaccurate normal contact solution. By comparing with Kalker’s CONTACT code, it shows both FASTSIM-based and FaStrip-based models can provide accurate global creep force. With regard to local rolling contact solution, only the accuracy of FaStrip-based models is satisfactory. Moreover, Ayasse-Chollet’s local ellipse approach appears to be the best choice for nonelliptic adaptation.

Study on Analytical Model of Nonlinear Vibration for Elastic Plates With Gaps Under Random Waves

2004 ◽  
Vol 126 (4) ◽  
pp. 504-509 ◽  
Author(s):  
Masanori Shintani ◽  
Manabu Hamai
Keyword(s):  
Nonlinear Vibration ◽  
Analytical Model ◽  
Force Characteristic ◽  
Solid Model ◽  
Random Waves ◽  
Elastic Plates ◽  
Analysis Model ◽  
Restoring Force ◽  
Elasto Plasticity ◽  
Force Characteristics

In this paper, an analytical model for the nonlinear elastic-plastic vibration for long plates with gaps subjected to random vibrations is considered. The nonlinear vibration is caused by the collision phenomena between a mass through a gap and plates with thickness of 0.5, 0.6, and 0.8 mm. An elastic perfectly plastic solid material is assumed in some cases, which adds another aspect to the nonlinear behavior of the system. The material characteristic of the steel is assumed to be an elasto-plasticity solid model. A restoring force characteristic is obtained as the nonlinear vibration of a cubic equation for 0.5, 0.6, and 0.8 mm, the thickness of the plates by experiments. Now the analytical model is proposed by the elasto-plasticity solid model. The relation between the displacement and the force is described by a complicated equation. The curve from the analytical model is called a deflection curve. The results by the analytical model are compared with the results by the experimental model. The restoring force characteristics by the analysis agree with those of the experiment. The restoring force characteristics of the analysis are described using cubic equations. The simple analysis model for evaluation of the vibration characteristic of the nonlinear vibration system, which performs collision vibration with gaps, is proposed by elasto-plasticity solid model in this paper. The results of this proposed analytical model agree with the experimental results better than the results of the minimum of error of square.

Active Control of the Running Behaviour of a Railway Vehicle: Stability and Curving Performances

2002 ◽  
Vol 37 (sup1) ◽  
pp. 157-170 ◽  
Author(s):  
G. Diana ◽  
S. Bruni ◽  
F. Cheli ◽  
F. Resta
Keyword(s):  
Active Control ◽  
Railway Vehicle ◽  
Vehicle Stability

Creep force characteristics between rail and wheel on scaled model

Wear ◽  
2002 ◽  
Vol 253 (1-2) ◽  
pp. 199-203 ◽  
Author(s):  
Akira Matsumoto ◽  
Yasuhiro Sato ◽  
Hiroyuki Ono ◽  
Yonjin Wang ◽  
Masayuki Yamamoto ◽  
...  
Keyword(s):  
Scaled Model ◽  
Creep Force ◽  
Force Characteristics

Creep Force Characteristics on Wheel/Rail Surface Condition (4^ Report)

2003 ◽  
Vol 2003.12 (0) ◽  
pp. 333-336
Author(s):  
Kosuke MATSUMOTO ◽  
Yoshihiro SUDA ◽  
Takeshi FUJII ◽  
Hisanao KOMINE ◽  
Takashi IWASA ◽  
...  
Keyword(s):  
Surface Condition ◽  
Creep Force ◽  
Force Characteristics

Nonlinear Contact Geometry Effects on Wheelset Dynamics

1980 ◽  
Vol 47 (1) ◽  
pp. 155-160 ◽  
Author(s):  
T. D. Burton ◽  
A. M. Whitman
Keyword(s):  
Multiple Time Scales ◽  
Railway Vehicle ◽  
Force Model ◽  
Multiple Time ◽  
Linear Creep ◽  
Nonlinear Contact ◽  
Small Parameters ◽  
Creep Force ◽  
Force Variation ◽  
The Stability

The nonlinear dynamic behavior of a simply restrained railway vehicle wheelset on tangent track is investigated. Nonlinearities due to the kinematics of wheel/rail contact (excluding flange contact) and creep force variation with creepage are considered for mildly noncircular wheel and rail profiles. The general equations of lateral and yawing motion of the wheelset are derived. These are then simplified by considering both normalized amplitude ε of the motion and angle of wheel/rail contact in the undisturbed position α0 as small parameters. Asymptotic solutions describing the influence of the nonlinearities on the stability and frequency of wheelset motion are obtained using the method of multiple time scales. The results are used to derive conditions for which a linear creep force model is valid.

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