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random　characteristics　OF　FLOW　FLUCTUATING　PRESSURE　AND　DYNAMIC　RESPONSE　ON　THE　SHAFT　SPILLWAY

Journal of Hydrodynamics 1995年第2期7卷 28-34页

作者： Cui Li(Dalian University of Technology, Dalian 116023, P. R. China) Dalian Univ of Technology Dalian China

The flow down a shaft spillway, connected with tunnel, results in nonsymmetric vortex around the axis of the shaft. The greater the nonsymmetry, the greater the pressure fluctuation and random vibration of *** paper deals with an attempt to determine the fluctuating pressure characteristics in the shaft. Stochastic theory and random time series are employed to analyse the sample function x(t) , its x(t) and x(t), and their correlations:The moments of the spectra are obtained:The fluctuating pressure characteristics are related to the non-symmetric inlet vortex. The relation between the point pressure spectra and fluctuating pressures on the shaft wall are indicated and *** paper gas further into the simulated test on the framed over-flow tower and puts forward an effective proposed way. Besides the calculation in frequency domain, computation in time domain is also ueed to analyse the same structure. The vibration source and the method to remove it are found out.

关键词： shaft spillway dynamic response random characteristics

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Impact of random characteristics of Flexible Textile Antenna on the Accuracy of Radio Link Analysis

Impact of Random Characteristics of Flexible Textile Antenna...

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2019年全国天线年会

作者： Jinxin Du Christophe Roblin Xuexia Yang School of Communication and Information Engineering Shanghai Univerisity Departement of Communication and electronics Teleom ParisTech

The random charateristics of the user-end terminal antenna,especially when it has flexible nature and is placed in disturbing environments,have non-ignorable impact on the accuracy of radio link *** this paper,we investigate quantitatively such random effects by using a statistical approach which combines a pre-constructed accurate antenna surrogate model and the classical WINNER2/+channel *** is noted that the variability of the efective performance of the terminal antenna due to the intrinsict randomness as well as environmental uncertainties is effectively large,and must be carefully taken into account by using appropriate antenna surrogate model to ensure the accuracy of radio link aassessment.

关键词： antenna surrogate model random characteristics channel model radio link assessment

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