Vibration characteristics of railway locomotive induced by gear tooth root crack fault under transient conditions

Jiang, Jianzheng; Chen, Zaigang; Zhai, Wanming; Tao, Zhang; Li, Yifan

doi:10.1016/j.engfailanal.2019.104285

Cited by 38 publications

(17 citation statements)

References 18 publications

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“…The M6A and FM4 both have good performances of evaluation the fault growth when the motor is decoupled, which has been reported in Ref. [37]. What's more, the Kurtosis is the least efficient indicator among them for the gear fault detection with 25% fault level case (g25).…”

Section: Theoretical Analysis Of the Dynamic Characteristics For The Motor-gear System With Faultsmentioning

confidence: 66%

Vibration Feature Evaluation of the Motor-Gear System with Gear Tooth Crack and Rotor Bar Error

Bai

Zeng

Wang

et al. 2021

Iran J Sci Technol Trans Mech Eng

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The high speed and high power density electromechanical system for the electric vehicle is urgently required to meet stricter emission regulation and achieve higher performance. Therefore, the electromechanical coupling effect is becoming more strengthened and may significantly degrade the performance of the motor and gear system. When gear or motor failures like gear tooth crack or rotor bar breakage are present, the operation safety of the electric vehicle would be threatened. So the exploration of the fault features for the motor-gear system is crucial for prevention of disastrous consequences. In this paper, the fault vibration features of the motor-gear system with gear root crack and motor rotor error under various excitations from both motor and gear transmission system are investigated. The electromechanical dynamic model considering the nonlinear air-gap permeance and time-varying mesh stiffness is employed, and the gear tooth root crack fault and the rotor bar breakage are integrated into the dynamic model to acquire the dynamic characteristics with faults. Then, the angular-synchronous average technique is applied to strengthen the statistical characteristics of fault vibration signal and eliminate the effect of speed variation due to the external excitation. The statistical indicators extracted from the angular-synchronous average vibration signals can reveal the progression of gear faults for the gear transmission without motor rotor error. However, the

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Section: Theoretical Analysis Of the Dynamic Characteristics For The Motor-gear System With Faultsmentioning

confidence: 66%

Vibration Feature Evaluation of the Motor-Gear System with Gear Tooth Crack and Rotor Bar Error

Bai

Zeng

Wang

et al. 2021

Iran J Sci Technol Trans Mech Eng

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show abstract

“…As one of the key components of mechanical transmission, spur gears have the characteristics of simple structure, convenient manufacture, reliable operation, and long service life and play an extremely important role in the process of power transmission. Spur gears have been used extensively in various mechanical fields [1][2][3][4]. However, due to the severity and complexity of operating conditions, there will inevitably be different degrees and types of failures in the operation of gear systems, such as tooth pitting, tooth root crack, tooth breaking, etc.…”

Section: Introductionmentioning

confidence: 99%

Effect of a Novel Tooth Pitting Model on Mesh Stiffness and Vibration Response of Spur Gears

Hou

Yang

et al. 2022

Mathematics

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The existence of pitting failure has a direct influence on the time-varying mesh stiffness (TVMS) and thus changes the vibration properties of the gears. The shape of pitting on the tooth surface is characterized by randomness and geometric complexity. The overlapping pitting shape has rarely been investigated, especially when the misalignment of gear base circle and root circle was considered. In this paper, the pitting shape is considered as approximately the union of several ellipse cylinders, in which the gear tooth is treated as a cantilever beam starting from the root circle. Then, the TVMS of perfect gear and that of gear with different pitting severity levels are solved by the potential energy method. The effect of pitting size on TVMS is discussed in detail. In addition, the vibration response in the frequency domain for the gear system is analyzed, and the effectiveness is qualitatively verified by comparing with the vibration signals of the experimental gearbox. The results indicate that the new pitting model overcomes the problem of ignoring the overlap between different pits and is more consistent with the actual situation. The presence of tooth pitting reduces the TVMS, and the complex sidebands appear around the gear mesh frequency and its harmonics. The proposed model can be used to predict the fluctuation of gear mesh stiffness when tooth pitting occurs, and the corresponding dynamic characteristics can provide the theoretical basis for gear condition monitoring and fault diagnosis.

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“…However, excessive contact load, inappropriate operating condition and insufficient lubrication usually cause various tooth failures such as wear (Flodin and Andersson, 1997; Geng et al , 2019; Huangfu et al , 2020a), pit (Chen et al , 2019a), spall (Huangfu et al , 2020b) and crack (Ma et al , 2015), which induce the vibration and noise. To enhance the lifetime and improve the reliability of the gear system, the dynamics have been investigated, and the methods of fault diagnosis have been developed significantly as well in recent years (Liang et al , 2018; Hu et al , 2015; Jiang et al , 2020; Yan et al , 2020a, b).…”

Section: Introductionmentioning

confidence: 99%

Nonlinear dynamics of a spur gear pair with tooth root crack based on an amplitude modulation function

Gao

Wang

Bajwa

2021

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PurposeGear transmissions are widely utilized in practice. This paper aims to uncouple the crack feature from the cracked time-varying mesh stiffness (TVMS) and investigate the effects of the crack on the nonlinear dynamics of a spur gear pair.Design/methodology/approachAn approximate method to simulate the cracked TVMS is proposed by using an amplitude modulation function. The ratio of mesh stiffness loss is introduced to estimate the TVMS with different crack depths and angles. The dynamic responses are obtained by solving a torsional model which takes the non-loaded static transmission error, the backlash and the cracked TVMS into account. By using the bifurcation diagram, the largest Lyapunov exponent (LLE) and dynamic mesh force, the influences of crack on nonlinear behaviors are examined. The dynamic characteristics are identified from the phase diagram, Poincaré map, dynamic mesh force, time series and FFT spectra.FindingsThe comparison between the healthy and cracked gear pairs indicates that the crack affects the system motions, such as the obvious changes of impact force and unpredictable instability. Besides, the additive and difference combination frequencies can be found in periodic-1 and -2 motions, but they are covered in periodic-3 and chaotic motions. Deeper crack is an important determinant of the nonlinear behaviors at a higher speed.Originality/valueThe research provides an interesting perspective on cracked TVMS and reveals the connection between crack and nonlinear behaviors of the gear pairs.

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Vibration characteristics of railway locomotive induced by gear tooth root crack fault under transient conditions

Cited by 38 publications

References 18 publications

Vibration Feature Evaluation of the Motor-Gear System with Gear Tooth Crack and Rotor Bar Error

Vibration Feature Evaluation of the Motor-Gear System with Gear Tooth Crack and Rotor Bar Error

Effect of a Novel Tooth Pitting Model on Mesh Stiffness and Vibration Response of Spur Gears

Nonlinear dynamics of a spur gear pair with tooth root crack based on an amplitude modulation function

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