Designing Better Transducers for Soil Bin Tests (Contributo in atti di convegno)

Type
Label
  • Designing Better Transducers for Soil Bin Tests (Contributo in atti di convegno) (literal)
Anno
  • 1995-01-01T00:00:00+01:00 (literal)
Alternative label
  • G. Ferretti, F. Malaguti, R. Paoluzzi; (1995)
    Designing Better Transducers for Soil Bin Tests
    in 5th North American ISTVS Conference/Workshop, Saskatoon, CD, May, 10-12 1995
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • G. Ferretti, F. Malaguti, R. Paoluzzi; (literal)
Pagina inizio
  • 159 (literal)
Pagina fine
  • 166 (literal)
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  • Proc.s of 5th North American ISTVS Conference/Workshop (literal)
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  • 8 (literal)
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  • CEMOTER - C.N.R. (literal)
Titolo
  • Designing Better Transducers for Soil Bin Tests (literal)
Abstract
  • One of the most widely force transducers used in soil bin for cutting forces measurements is the well known extended octagonal ring dynamometer. This device, though originally developed mainly by empirical considerations [1], gives generally a satisfactory response to the demands imposed by static or quasi-static tests where a high degree of accuracy is not required. When a greater accuracy is desired or dynamic measurements are to be carried out, two factors have to be taken into consideration at the same time: .. the transducer accuracy must be improved through a reduction of the measurement error; o the dynamic characteristic, in terms of natural frequencies, must not affect the measured o. data in the phenomena under investigation. 'The two a,spects can be decoupled, if static and dynamic characteristics are not relevant at the same time. To this purpose the authors developed two independent approaches, the first one [3] based on a FEM constrained design optimization to improve static measurement accuracy, the second [5] based on a the determination of the natural frequencies with simplified dynamic analysis and modal numeric analysis in order to evaluate if the first natural frequency is sufficie: Qt1y beyond the soil rupture frequency expected in soil bin tests. The purpose of this paper is then two-folded: .. to evaluate the dynamic response through a FEM numerical analysis having less restrictive assumptions .. tp evaluate the performance of the optimized dynamometer and build the bases for a co~p.led design of both static and dynamic characteristics Th~p~ssibilities offered by the numerical method to improve measurement accuracy in soil bin tests qre considerable [3], especially when some problems shown by early sWdies [6] are taken into account. (literal)
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