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Analysis of fluid vibration transfer path and parameter sensitivity of swash plate axial piston pump

High Technology Letters 2022年第2期28卷 217-226页

作者：赵建华 WANG Xinwei LIU Hang PEI Youzhi YANG Yong WU Zhaohua WANG Jin XING Lanchun DU Guojun Shijiazhuang Haishan Industrial Development Co. Ltd.Shijiazhuang 050200P.R.China Fluid Power Transmission and Control Laboratory Yanshan UniversityQinhuangdao 066004P.R.China College of Civil Engineering and Mechanics Yanshan UniversityQinhuangdao 066004P.R.China

Taking swash plate axial piston pump as the research object,the mechanism of fluid vibration and transfer rule are analyzed.The pump shell can be assumed as the ultimate recipient of vibration transmission,the path model and differential equations from the fluid to the shell are established.The parameters of the path model are determined by the simulation software,and the mathematical model is solved by the simulation software.And time/frequency domain analysis of vibration acceleration of shell is presented.Based on the different influence of various parameters in the transfer path model on transfer characteristics and vibrational recipients,the time-varying parameters are studied by using sensitivity analysis theory,and the influence of the structural parameters on the vibration characteristics of vibration subject is quantitatively analyzed.The research in the paper provides theoretical basis for vibration analysis and structure parameter optimization of axial piston pump.

关键词： axial plunger pump fluid vibration transfer path shell vibration fault analysis

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An investigation into high-speed train interior noise with operational transfer path analysis method

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Railway Engineering Science 2021年第1期29卷 1-14页

作者： Muxiao Li Ziwei Zhu Tiesong Deng Xiaozhen Sheng State Key Laboratory of Traction Power Southwest Jiaotong UniversityChengdu 610031China CRRC Qingdao Sifang Co. Ltd.Qingdao 266111China School of Urban Railway Transportation Shanghai University of Engineering ScienceShanghai 201620China

Passengers’demands for riding comfort have been getting higher and higher as the high-speed railway develops.Scientific methods to analyze the interior noise of the high-speed train are needed and the operational transfer path analysis(OTPA)method provides a theoretical basis and guidance for the noise control of the train and overcomes the shortcomings of the traditional method,which has high test efficiency and can be carried out during the working state of the targeted machine.The OTPA model is established from the aspects of“path reference point-target point”and“sound source reference point-target point”.As for the mechanism of the noise transmission path,an assumption is made that the direct sound propagation is ignored,and the symmetric sound source and the symmetric path are merged.Using the operational test data and the OTPA method,combined with the results of spherical array sound source identification,the path contribution and sound source contribution of the interior noise are analyzed,respectively,from aspects of the total value and spectrum.The results show that the OTPA conforms to the calculation results of the spherical array sound source identification.At low speed,the contribution of the floor path and the contribution of the bogie sources are dominant.When the speed is greater than 300 km/h,the contribution of the roof path is dominant.Moreover,for the carriage with a pantograph,the lifted pantograph is an obvious source.The noise from the exterior sources of the train transfer into the interior mainly through the form of structural excitation,and the contribution of air excitation is non-significant.Certain analyses of train parts provide guides for the interior noise control.

关键词： High-speed train Interior noise OTPA method Acoustical source identification transfer path Source contribution

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Vibration Characteristics of Framed SUV Cab Based on Coupled transfer path Analysis

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Automotive Innovation 2019年第1期2卷 26-34页

作者： Wei Yang Jiqing Chen Zongjian Liu Fengchong Lan School of Mechanical and Automotive Engineering South China University of Technology and Guangdong Provincial Key Laboratory of Automotive EngineeringGuangzhou 510641China

The vibration transmission paths in a sport-utility vehicle with a frame structure were used to evaluate the coupled vibra-tion of each vibration transmission link.This method was based on the transmission path of an“engine-powertrain mount system-frame-vehicle body suspension-body-driver seat rail,”and the research objective was to improve the vibration char-acteristics of the cab.This coupled transfer path analysis combined analysis and experiment to establish the vehicle vibration transmission path model and a finite element simulation model.With this method,the vibration level of the driver’s seat rail was reduced and engineering practice was effectively used to improve the vibration characteristics of the cab.This method was applied to a framed SUV cabin.

关键词： Framed SUV SUV cabin Vibration characteristics Coupling transfer path

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Study on Vibration Characteristics of Framed SUV Cab Based on Coupled transfer path Analysis

Study on Vibration Characteristics of Framed SUV Cab Based o...

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2018中国汽车工程学会年会

作者： YANG Wei CHEN Jiqing LIU Zongjian LAN Fengchong School of Mechanical and Automotive Engineering South China University of Technology ＆Guangdong Provincial Key Laboratory of Automotive Engineering

According to the structure of the Sport-utility Vehicle with Frame car body and considering the coupled vibration of each transmission link,a method based on the transmission path of "engine-power-train mount system-frame-vehicle body suspension-bodydriver seat rail" was presented to improve the vibration characteristics of the cab.Based on the coupled transfer path analysis,this method combined analysis and experiment to establish the vehicle vibration transmission path model and the finite element simulation model,which is to reduce the vibration level of the driver’s seat rail and then effectively improve the vibration characteristics of the cab in engineering practice.This method was applied to analyze and optimize the vibration characteristics of a framed SUV cab,and a good optimization effect was achieved.

关键词： framed SUV cab vibration characteristics coupling transfer path

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Gear fault diagnosis using gear meshing stiffness identified by gearbox housing vibration signals

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Frontiers of Mechanical Engineering 2022年第4期17卷 143-162页

作者： Xiaoluo YU Yifan HUANGFU Yang YANG Minggang DU Qingbo HE Zhike PENG State Key Laboratory of Mechanical System and Vibration Shanghai Jiao Tong UniversityShanghai 200240China Science and Technology on Vehicle Transmission Laboratory China North Vehicle Research InstituteBeijing 100072China

Gearbox fault diagnosis based on vibration sensing has drawn much attention for a long time.For highly integrated complicated mechanical systems,the intercoupling of structure transfer paths results in a great reduction or even change of signal characteristics during the process of original vibration transmission.Therefore,using gearbox housing vibration signal to identify gear meshing excitation signal is of great significance to eliminate the influence of structure transfer paths,but accompanied by huge scientific challenges.This paper establishes an analytical mathematical description of the whole transfer process from gear meshing excitation to housing vibration.The gear meshing stiffness(GMS)identification approach is proposed by using housing vibration signals for two stages of inversion based on the mathematical description.Specifically,the linear system equations of transfer path analysis are first inverted to identify the bearing dynamic forces.Then the dynamic differential equations are inverted to identify the GMS.Numerical simulation and experimental results demonstrate the proposed method can realize gear fault diagnosis better than the original housing vibration signal and has the potential to be generalized to other speeds and loads.Some interesting properties are discovered in the identified GMS spectra,and the results also validate the rationality of using meshing stiffness to describe the actual gear meshing process.The identified GMS has a clear physical meaning and is thus very useful for fault diagnosis of the complicated equipment.

关键词： gearbox fault diagnosis meshing stiffness identification transfer path signal processing

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