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A comparative study of surface waviness models for predicting vibrations of a ball bearing

Science China(Technological Sciences) 2017年第12期60卷 1841-1852页

作者： LIU Jing WU Hao SHAO YiMin State Key Laboratory of Mechanical Transmission Chongqing University Chongqing 400044 China College of Mechanical Engineering Chongqing University Chongqing 400044 China

Surface waviness models utilized to describe the excitation events in the ball bearings(BABs) play an important role in predicting the vibrations of the ball bearing systems. This work proposes a comparative study on the most relevant existing surface waviness models. One model is named as time-varying displacement(TVD) model, which can only describe the time-varying displacement excitation(TDIE). Another model is named as TVDS model, which can describe the TDIE and time-varying contact stiffness coefficient excitation(TCSE). The influences of the wave number, maximum amplitude, nonuniform distribution on the contact stiffness coefficients are studied, as well as vibrations of the BAB. The comparative results demonstrate that the time-varying displacement and stiffness(TVDS) model can provide a more accurate impulses caused by the uniform and nonuniform surface waviness on the races of the BABs. It also seems that the surface waviness distribution has a significantly influence on vibrations of the BABs.

关键词： ball bearing surface waviness nonuniform distribution vibrations

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DEPTH PROFILING OF RADIOACTIVE NUCLIDES IN SOIL

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Nuclear Science and Techniques 1995年第2期6卷 121-125页

作者：姜让荣卢兆伦张铭 ZhejiangProvinceEnvironmentalRadiationMonitoringCenter Hangzhou310012

Analyses of 114 soil samples in Ningbo City show that,in general,there are statistical differences of 137Cs and 40K contents between every layers,the other kinds of natural radionuclides present an increasing tendency with *** the γ radiation dose rate is estimated by Beck Formula,owing to the effect of those nonuniform distributions is less than 1% and can be ignored.'

关键词： Natural radioactive nuclides,￣137Cs nonuniform distribution Depth of soil China

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A Novel Non-Uniform Node distribution Strategy for Wireless Sensor Networks

A Novel Non-Uniform Node Distribution Strategy for Wireless ...

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2011 Chinese Control and Decision Conference（CCDC）

作者： Junjie Yuan,Qiang Ling,Jinfeng Yan,Weihua Zhang and Huihui Gu are with Dept.of Automation,University of Science and Technology of China,Hefei,Anhui 230027,China.

In wireless sensor networks,sensor nodes need to send sensing data to the sink *** to the limitation on the communication distance,some sensor nodes far from the sink node cannot send their data directly the sink node and need other nodes to relay their data to the sink *** nodes near the sink node have to spend much energy to relay the data sent by the far nodes,and are,therefore,dying *** the near nodes all die,no data can be sent to the sink and the sensor network stops working,which is called the enery *** propose a novel non-uniform strategy to distribute the sensor nodes,which appropriately arranges the node density based on the distance to the sink node and can efficiently avoid the energy *** strategy is simulated on an NS2 *** results confirms the proposed strategy can significantly extend the life of the sensor network,substantially increase the total transmitted data amount and avoid the energy hole.

关键词： Wireless sensor networks Energy hole nonuniform distribution Energy balance

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