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Measured load spectra of the bearing in high-speed train gearbox under different gear meshing conditions 被引量:2
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作者 Yu Hou Xi Wang +7 位作者 Shouguang Sun Hongbo Que Rubing Guo Xinhai Lin Siqin Jin Chengpan Wu Yue Zhou Xiaolong Liu 《Railway Engineering Science》 2023年第1期37-51,共15页
The load spectrum is a crucial factor for assess-ing the fatigue reliability of in-service rolling element bear-ings in transmission systems.For a bearing in a high-speed train gearbox,a measurement technique based on... The load spectrum is a crucial factor for assess-ing the fatigue reliability of in-service rolling element bear-ings in transmission systems.For a bearing in a high-speed train gearbox,a measurement technique based on strain detection of bearing outer ring was used to instrument the bearing and determine the time histories of the distributed load in the bearing under different gear meshing conditions.Accordingly,the load spectrum of the total radial load car-ried by the bearing was compiled.The mean value and class interval of the obtained load spectrum were found to vary non-monotonously with the speed and torque of gear mesh-ing,which was considered to be caused by the vibration of the shaft and the bearing cage.As the realistic service load input of bearing life assessment,the measured load spectrum under different gear meshing conditions can be used to pre-dict gearbox bearing life realistically based on the damage-equivalent principle and actual operating conditions. 展开更多
关键词 Gearbox bearing High-speed train Strain response Load spectra Gear meshing conditions
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A trailer car dynamics model considering brake rigging of a high-speed train and its application
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作者 Zhiwei Wang Linchuan Yang +2 位作者 Jiliang Mo Song Zhu Wenwei Jin 《Railway Engineering Science》 2023年第3期269-280,共12页
Brake systems are essential for the speed regulation or braking of a high-speed train.The vehicle dynamic performance under braking condition is complex and directly affects the reliability and running safety.To revea... Brake systems are essential for the speed regulation or braking of a high-speed train.The vehicle dynamic performance under braking condition is complex and directly affects the reliability and running safety.To reveal the vehicle dynamic behaviour in braking process,a comprehensive trailer car dynamics model(TCDM)considering brake systems is established in this paper.The dynamic interactions between the brake system and the other connected components are achieved using the brake disc-pad frictions,brake suspension systems,and wheel-rail interactions.The force and motion transmission from the brake system to the wheel-rail interface is performed by the proposed TCDM excited by track irregularity.In addition,the validity of TCDM is verified by experimental test results.On this basis,the dynamic behaviour of the coupled system is simulated and discussed.The findings indicate that the braking force significantly affects vehicle dynamic behaviour including the wheel-rail forces,suspension forces,wheelset torsional vibration,etc.The dynamic interactions within the brake system are also significantly affected by the vehicle vibration due to track irregularity.Besides,the developed TCDM can be further employed to the dynamic assessment of such a coupled mechanical system under different braking conditions. 展开更多
关键词 Brake system Disc-pad frictions Wheel-rail interactions Track irregularity High-speed train
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Torque effect on vibration behavior of high-speed train gearbox under internal and external excitations
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作者 Yue Zhou Xi Wang +5 位作者 Hongbo Que Rubing Guo Xinhai Lin Siqin Jin Chengpan Wu Yu Hou 《Railway Engineering Science》 EI 2024年第2期229-243,共15页
The high-speed train transmission system,experiencing both the internal excitation originating from gear meshing and the external excitation originating from the wheel-rail interaction,exhibits complex dynamic behavio... The high-speed train transmission system,experiencing both the internal excitation originating from gear meshing and the external excitation originating from the wheel-rail interaction,exhibits complex dynamic behavior in the actual service environment.This paper focuses on the gearbox in the high-speed train to carry out the bench test,in which various operat-ing conditions(torques and rotation speeds)were set up and the excitation condition covering both internal and external was created.Acceleration responses on multiple positions of the gearbox were acquired in the test and the vibration behavior of the gearbox was studied.Meanwhile,a stochastic excitation modal test was also carried out on the test bench under different torques,and the modal parameter of the gearbox was identified.Finally,the sweep frequency response of the gearbox under gear meshing excitation was analyzed through dynamic modeling.The results showed that the torque has an attenuating effect on the amplitude of gear meshing frequency on the gearbox,and the effect of external excitation on the gearbox vibration cannot be ignored,especially under the rated operating condition.It was also found that the torque affects the modal param-eter of the gearbox significantly.The torque has a great effect on both the gear meshing stiffness and the bearing stiffness in the transmission system,which is the inherent reason for the changed modal characteristics observed in the modal test and affects the vibration behavior of the gearbox consequently. 展开更多
关键词 High-speed train GEARBOX Bench test Vibration behavior Modal identification
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Effect of nodularity on mechanical properties and fracture of ferritic spheroidal graphite iron 被引量:1
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作者 Ze-hua Wang Xin Zhang +2 位作者 Fei-long Xu Kun-cai Qian Kai-min Chen 《China Foundry》 SCIE 2019年第6期386-392,共7页
Ferritic spheroidal graphite irons with nodularity from 72%to 96%were prepared.The relationship between the nodularity and the mechanical properties of the ferritic spheroidal graphite iron was investigated.The effect... Ferritic spheroidal graphite irons with nodularity from 72%to 96%were prepared.The relationship between the nodularity and the mechanical properties of the ferritic spheroidal graphite iron was investigated.The effect of nodularity on the mechanical properties and tensile fracture of the cast iron were studied.Results showed that the tensile strength Rm,yield strength Rp0.2,elongation to failure A5,and impact energy KV2 of the cast iron had a good linear relationship with its nodularity.Nodularity and annealing treatment would obviously affect the fracture characteristics of ferritic spheroidal graphite iron.The annealed ferritic spheroidal graphite iron with 93%nodularity showed a completely ductile rupture.With the decrease of nodularity from 93%to 72%,the cleavage fracture area ratio increased gradually from 0%to 8.3%.Compared with as-cast ferritic spheroidal graphite iron,annealing treatment reduced the cleavage fracture area of the ferritic spheroidal graphite iron. 展开更多
关键词 DUCTILE IRON NODULARITY mechanical PROPERTY FRACTURE
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Axial Micro-Strain Sensor Based on FM-FBG via Dual-Mode ML-FMF in Sensor Networks
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作者 Xiao Liang Zhaoxin Geng +2 位作者 Jingcong Li Pengyu Zhang Wenqiang Liu 《Journal of Computer and Communications》 2020年第10期1-6,共6页
<div style="text-align:justify;"> An in-fiber axial micro-strain sensor based on a Few Mode Fiber Bragg Grating (FM-FBG) is proposed and experimentally characterized. This FM-FBG is in inscribed in a m... <div style="text-align:justify;"> An in-fiber axial micro-strain sensor based on a Few Mode Fiber Bragg Grating (FM-FBG) is proposed and experimentally characterized. This FM-FBG is in inscribed in a multi-layer few-mode fiber (ML-FMF), and could acquire the change of the axial strain along fibers, which depends on the transmission dips. On account of the distinct dual-mode property, a good stability of this sensor is realized. The two transmission dips could have the different sensing behaviors. Both the propagation characteristics and operation principle of such a sensor are demonstrated in detail. High sensitivity of the FM-FBG, ~4 pm/με and ~4.5 pm/με within the range of 0 με - 1456 με, is experimentally achieved. FM-FBGs could be easily scattered along one fiber. So this sensor may have a great potential of being used in sensor networks. </div> 展开更多
关键词 Micro-Strain Sensor ML-FMF Dual-Mode Fiber FM-FBG Sensor Network
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Variation in contact load at the most loaded position of the outer raceway of a bearing in high-speed train gearbox 被引量:5
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作者 Yu Hou Xi Wang +6 位作者 Hongbo Que Rubing Guo Xinhai Lin Siqin Jin Chengpan Wu Yue Zhou Xiaolong Liu 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2021年第11期1683-1695,I0003,共14页
For the fatigue failure and tribological property of a rolling element bearing,the contact load variation plays a significant role while the most loaded position of the bearing outer raceway takes the greatest risk of... For the fatigue failure and tribological property of a rolling element bearing,the contact load variation plays a significant role while the most loaded position of the bearing outer raceway takes the greatest risk of failure.This paper focuses on the variation in contact load on the most loaded position of the outer raceway of a gearbox bearing in high-speed train.Under operation conditions of different input speeds and torques,the dynamic contact load distribution in a gearbox bearing of high-speed train was measured by instrumenting the bearing with strain gauges.The most loaded position was identified accordingly and the features and reasons of the variation in contact load on this position were suggested.Three factors were found to have varying degrees of impact on the contact load variation under different gear meshing conditions:modal vibration of the cage or shaft,radial geometrical differences among the rollers and vibration of the gearbox housing. 展开更多
关键词 High-speed train gearbox Instrumented bearing Load distribution Contact load variation
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Regression model for estimation of attribute reliability
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作者 Guangyan Lu Wenjun Chang 《Journal of Control and Decision》 EI 2021年第2期201-212,共12页
In this paper,a regression model is developed to estimate attribute reliability in the evidential reasoning(ER)context.By analysing the difference between attribute weight and attribute reliability,a general qualitati... In this paper,a regression model is developed to estimate attribute reliability in the evidential reasoning(ER)context.By analysing the difference between attribute weight and attribute reliability,a general qualitative definition of attribute reliability is provided.The reliability of an attribute is quantitatively measured in consistence with the qualitative definition in the context of the ER approach.A regression model is then constructed to generate attribute reliabilities by minimising the maximum differences between the real value of attribute reliability and its estimation.Within the post-optimal solution space of attribute reliabilities,an optimisation model is constructed to determine the expected utilities of each alternative in order to generate solutions to multiple attribute decision analysis problems.Asale place selection problem in Qingyang County of Chizhou in Anhui province of China is analysed using the proposed regression model to demonstrate its detailed implementation process,validity and applicability. 展开更多
关键词 Multiple attribute decision analysis attribute reliability regression model evidential reasoning rule evidential reasoning approach
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Multisensor information fusion:Future of environmental perception in intelligent vehicles
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作者 Yongsheng Zhang Chen Tu +1 位作者 Kun Gao Liang Wang 《Journal of Intelligent and Connected Vehicles》 EI 2024年第3期163-176,共14页
As urban transportation increasingly impacts daily life,efficiently utilizing traffic resources and developing public transportation have become crucial for addressing issues such as congestion,frequent accidents,and ... As urban transportation increasingly impacts daily life,efficiently utilizing traffic resources and developing public transportation have become crucial for addressing issues such as congestion,frequent accidents,and noise pollution.The rapid advancement of intelligent autonomous driving technologies,particularly environmental perception technologies,offers new directions for solving these problems.This review discusses the application of multisensor information fusion technology in environmental perception for intelligent vehicles,analyzing the components and performance of various sensors and their specific applications in autonomous driving.Through multisensor information fusion,the accuracy of environmental perception is enhanced,optimizing decision support for autonomous driving systems and thereby improving vehicle safety and driving efficiency.This study also discusses the challenges faced by information fusion technology and future development trends,providing references for further research and application in intelligent transportation systems. 展开更多
关键词 intelligent vehicles environmental perception multisensor information fusion autonomous driving traffic safety
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