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The Fundamentals Underlying the Computations of Acceleration for General Dynamic Applications:Issues and Noteworthy Perspectives

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Computer Modeling in Engineering & Sciences 2015年第2期104卷 133-158页

作者： M.Shimada a.hoitink K.K.Tamma Department of Mechanical Engineering University of Minnesota111 Church St.SEMinneapolisMN55455USA.

To-date,with the exception of the Newmark method and the midpoint rule,most computational algorithms under the umbrella of LMS methods,which are predominantly employed in research and commercial software fail to properly evaluate acceleration computations accurately for conducting the numerical dynamic ***,this is not trivial and a sound theoretical basis of the fundamental underlying issues is described in *** this paper,we provide a resolution and point-out several noteworthy perspectives to address the proper evaluation of acceleration computations for structural dynamics applications with focus on the class of LMS methods as an illustration.

关键词： acceleration trivial illustration

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On the use of horizontal acoustic Doppler profilers for continuous bed shear stress monitoring

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International Journal of Sediment Research 2013年第2期28卷 260-268页

作者： B.VERMEULEN AJF hoitink MG SASSI Hydrologyand Quantitative Water Management Group Department of Environmental SciencesWageningen UniversityPO Box 476700AA Wageningenthe Netherlands Ph.D.Candidate Institute for Marine and Atmospheric Research Department of Physical Geography Utrecht UniversityPO Box 80.0053508TA Utrechtthe Netherlands Assoc.Prof. Hydrologyand Quantitative Water Management Group Department of Environmental SciencesWageningen UniversityPO Box 476700AA Wageningenthe Netherlands Hydrologyand Quantitative Water Management Group Department of Environmental SciencesWageningen UniversityPO Box 476700AA Wageningenthe Netherlands Dr.

Continuous monitoring of bed shear stress in large river systems may serve to better estimate alluvial sediment transport to the coastal *** we explore the possibility of using a horizontally deployed acoustic Doppler current profiler(ADCP) to monitor bed shear stress,applying a prescribed boundary layer model,previously used for discharge *** model parameters include the local roughness length and a dip correction factor to account for sidewall *** these parameters depend on river stage and on the position in the cross-section, and were estimated from shipborne ADCP *** applied the calibrated boundary layer model to obtain bed shear stress estimates over the measuring range of the *** validate the results,co-located coupled ADCPs were used to infer bed shear stress,both from Reynolds stress profiles and from mean velocity profiles. From HADCP data collected over a period of 1.5 years,a time series of width profiles of bed shear stress was obtained for a tidal reach of the Mahakam River,East Kalimantan,Indonesia.A smaller dataset covering 25 hours was used for comparison with results from the coupled *** bed shear stress estimates derived from Reynolds stress profiles appeared to be strongly affected by local effects causing upflow and downflow,which are not included in the boundary layer model used to derive bed shear stress with the horizontal *** shear stresses from the coupled ADCP are representative of a much more localized flow,while those derived with the horizontal ADCP resemble the net effect of the flow over larger *** shear stresses obtained from mean velocity profiles from the coupled ADCPs show a good agreement between the two methods,and highlight the robustness of the method to uncertainty in the estimates of the roughness length.

关键词： Bed-shear stress Horizontal ADCP Coupled ADCP Mahakam river Reynolds stress profiles

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