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Condition monitoring of wheel-rail contact forces has great significance for evaluating the dynamic performance of railway vehicles. Instrumented wheelset method has disadvantages that strain gages are complicated in arrangement, wheel-rail forces decoupling is difficult, and the accuracy is low. Combined with the digital image correlation (DIC) technology, this paper introduces a novel non-contact monitoring method based on space fixed-point strain on the surface of wheel web. Through the finite element modeling and simulation analysis of wheelset, it is found that the strain at some space fixed-points on the surface of wheel web is linear with lateral/vertical forces. Based on this conclusion, the numerical equation between single space fixed-point strain and the lateral/vertical forces is established. Two point numerical equations can be decoupled to obtain the lateral and vertical force. The space fixed-point strain can be obtained by non-contact using the mature DIC technology and then achieve the simple and accurate measurement method of wheel-rail contact forces. It is verified by FEM simulation results that under the premise of using DIC technology to get space fixed-point strain of wheel web; the force monitoring method introduced in this paper can obtain the wheel-rail contact forces accurately and simply, which has important theoretical guiding significance for wheel-rail contact forces monitoring.
Xiaochao Wang; Zhenggang Lu; Juyao Wei; Yang He. Wheel-Rail Contact Forces Monitoring Based on Space Fixed-Point Strain of Wheel Web and DIC Technology. Recent Advances in Computational Mechanics and Simulations 2021, 295 -304.
AMA StyleXiaochao Wang, Zhenggang Lu, Juyao Wei, Yang He. Wheel-Rail Contact Forces Monitoring Based on Space Fixed-Point Strain of Wheel Web and DIC Technology. Recent Advances in Computational Mechanics and Simulations. 2021; ():295-304.
Chicago/Turabian StyleXiaochao Wang; Zhenggang Lu; Juyao Wei; Yang He. 2021. "Wheel-Rail Contact Forces Monitoring Based on Space Fixed-Point Strain of Wheel Web and DIC Technology." Recent Advances in Computational Mechanics and Simulations , no. : 295-304.
The fault response signals of an axle-box bearing of a rail vehicle have strongly non-linear and non-stationary characteristics, which can reflect the operating state of the running gears. This paper proposes a novel method for bearing fault diagnosis based on frequency-domain energy feature reconstruction (EFR) and composite multiscale permutation entropy (CMPE). First, a wavelet packet transform (WPT) is applied to decompose the vibration signals into multiple frequency bands. Then, considering that the bearing-localized defects cause the axle-box bearing system to resonate at a high frequency, which will lead to uneven energy distribution of the signal in the frequency domain, the energy factors of each frequency band are calculated by an energy feature extraction algorithm, from which the frequency band with maximum energy factor (which contains abundant fault information) is reconstructed to the time-domain signal. Next, the complexity of the reconstructed signals is calculated by CMPE as fault feature vectors. Finally, the feature vectors are input into a medium Gaussian support vector machine (MG-SVM) for bearing condition classification. The proposed method is validated by a public bearing data set and a wheelset-bearing system test bench data set. The experimental results indicate that the proposed method can effectively extract bearing fault features and provides a new solution for condition monitoring and fault diagnosis of rail vehicle axle-box bearings.
Xiaochao Wang; Zhenggang Lu; Juyao Wei; Yuan Zhang. Fault Diagnosis for Rail Vehicle Axle-Box Bearings Based on Energy Feature Reconstruction and Composite Multiscale Permutation Entropy. Entropy 2019, 21, 865 .
AMA StyleXiaochao Wang, Zhenggang Lu, Juyao Wei, Yuan Zhang. Fault Diagnosis for Rail Vehicle Axle-Box Bearings Based on Energy Feature Reconstruction and Composite Multiscale Permutation Entropy. Entropy. 2019; 21 (9):865.
Chicago/Turabian StyleXiaochao Wang; Zhenggang Lu; Juyao Wei; Yuan Zhang. 2019. "Fault Diagnosis for Rail Vehicle Axle-Box Bearings Based on Energy Feature Reconstruction and Composite Multiscale Permutation Entropy." Entropy 21, no. 9: 865.
Wang Xiaochao; Lu Zhenggang. Anti-kink System and Dynamics Simulation of Low Floor Tram. Chinese Journal of Mechanical Engineering 2019, 55, 132 -139.
AMA StyleWang Xiaochao, Lu Zhenggang. Anti-kink System and Dynamics Simulation of Low Floor Tram. Chinese Journal of Mechanical Engineering. 2019; 55 (14):132-139.
Chicago/Turabian StyleWang Xiaochao; Lu Zhenggang. 2019. "Anti-kink System and Dynamics Simulation of Low Floor Tram." Chinese Journal of Mechanical Engineering 55, no. 14: 132-139.
As the well-known difficulties are that feedback signals are not easy and economical measurement in practice for active control, this paper presents a study of state estimation for active control of independently rotating wheels (IRW) based on observers. The reduced-order observer and high-order sliding mode observer are used to provide reliable and accurate estimations of the wheel pair state and track curvature using practical sensors. This proposed method uses less sensors than the one of previous studies. Furthermore, lateral accelerator and yaw velocity sensors (gyros) are economical and available for active steering and stability control system to obtain the required feedback signals. The wheels’ relative rotational speed, track curvature and yaw angle of wheelsets are the feedback signals for IRW active control approach. Computer simulations are used to verify the effectiveness of proposed methods and assess control performance in stability and negotiation.
Zheng-Gang Lu; Xiao-Jie Sun; Jun-Qi Yang. Integrated active control of independently rotating wheels on rail vehicles via observers. Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit 2016, 231, 295 -305.
AMA StyleZheng-Gang Lu, Xiao-Jie Sun, Jun-Qi Yang. Integrated active control of independently rotating wheels on rail vehicles via observers. Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit. 2016; 231 (3):295-305.
Chicago/Turabian StyleZheng-Gang Lu; Xiao-Jie Sun; Jun-Qi Yang. 2016. "Integrated active control of independently rotating wheels on rail vehicles via observers." Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit 231, no. 3: 295-305.
An approach to optimize the wheel reprofiling of a high-speed electric multiple unit (EMU) train is presented; it has three functions as objectives: the critical speed of the train, the contact stress that affects the contact fatigue of wheel/rail wear and the diameter of the nominal rolling circle of the wheel. The vertical coordinates of the control points on the curve of the wheel profile are used as design variables and the upper and lower values of each control point are utilized as additional limiting conditions of the curve, with the height, thickness and contact angle of the wheel flange as well as the derivative of the curve acting as constraints on the geometry parameters. A multi-objective optimization model is established for the wheel reprofiling of a high-speed EMU train; three models are created: standard, worn and optimized wheel profiles. Comparisons of wheel/rail contact, running stability and curving performance of the vehicle are performed. It is shown that the wheel profile obtained from the reprofiling optimization model satisfies the constraints and its corresponding dynamic performance has a good agreement with that of a standard wheel profile with a 30 mm thick wheel flange. A performance close to that of a standard wheel profile can be obtained even though the worn wheel is not reprofiled to have the standard profile. Also, the amount of diameter reduction in the direction of the nominal rolling circle is reduced and service life-time is extended by employing the proposed wheel reprofiling approach based on the multi-objective optimization strategy.
Zhenggang Lu; Baoan Zhang; Hengliang Wang. Wheel reprofiling of a high-speed electric-multiple-unit train based on a multi-objective optimization strategy. Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit 2013, 229, 484 -499.
AMA StyleZhenggang Lu, Baoan Zhang, Hengliang Wang. Wheel reprofiling of a high-speed electric-multiple-unit train based on a multi-objective optimization strategy. Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit. 2013; 229 (5):484-499.
Chicago/Turabian StyleZhenggang Lu; Baoan Zhang; Hengliang Wang. 2013. "Wheel reprofiling of a high-speed electric-multiple-unit train based on a multi-objective optimization strategy." Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit 229, no. 5: 484-499.
To investigate the influence of flexibility of wheelset in high-speed rotation on vehicle dynamics performance, the finite element model of wheelset was established and its unconstrained modal analysis was carried out correspondingly to obtain modal information using modal synthesis method. The flexible wheelset-rigid rail contact mechanics model was established according to multi-body system dynamics theory. Based on the flexible wheelset-rigid rail contact mechanics model, the vehicle-track coupled dynamics model containing high-speed rotating flexible wheelsets was established, and research on the influence of structural vibration of flexible wheelset on vehicle dynamics performance was performed when running on tangent and curved tracks. Results show that the structural vibration of high-speed wheelset has an obvious influence on the position of wheel-rail contact point, creepages, and creep forces and derailment coefficient. Thus, the more accurate flexible wheelset-rail coupled model is essential to be employed to research the interaction of wheel and rail, wheel-rail rolling contact fatigue, and wheel-rail noise.
Baoan Zhang; Zhenggang Lu. Dynamics Analysis of High-Speed Electric Multiple Unit Considering Flexibility of Wheelset. ICTE 2013 2013, 258 -264.
AMA StyleBaoan Zhang, Zhenggang Lu. Dynamics Analysis of High-Speed Electric Multiple Unit Considering Flexibility of Wheelset. ICTE 2013. 2013; ():258-264.
Chicago/Turabian StyleBaoan Zhang; Zhenggang Lu. 2013. "Dynamics Analysis of High-Speed Electric Multiple Unit Considering Flexibility of Wheelset." ICTE 2013 , no. : 258-264.