Scientific paper ID 1827 : 2019/3
EXPERIMENTAL METHODS FOR DETERMINING THE DYNAMIC CHARACTERISTICS OF CONSTRUCTION MACHINES IN REACTION WITH WORKING SOILS AND BULK MATERIALS

Boris Petkov, Emil Iontchev

Laboratory non-standardized methods for determining the dynamic characteristics of bulk materials make it possible to determine the coefficients of elasticity (hardness) of the soil and bulk materials damping factors. The above considerations warrant that laboratory nonstandard - frequency and deformation methods as a basis for the development of a methodology for conducting experiments to determine damping and elasticity of soil and bulk materials are appropriate.

In this paper are presented following results:

1.Based on a study analyzing the feasibility of different experimentation methods to determine the dynamic characteristics of soils and bulk materials, laboratory-frequency and deformation methods have been selected,

2. An original schematic diagram of an impact stress stand using the frequency and deformation method is presented.

4. Experimental methodologies have been developed based on the selected methods and the test rig presented for impact loading.

The presented methodologies for conducting experiments for determining the dynamic characteristics of soils and bulk materials are part of the research project under contract № 146 / 12.04.2018 with the assignor of the University of Transport ”Todor Kableshkov”.


Строителни машини динамични характеристики почви насипни материали коефициент на еластичност коефициент на демпфериране.dynamic characteristics soils bulk materials coefficient of elasticity damping factor.Boris Petkov Emil Iontchev

BIBLIOGRAPHY

[1] Galina Petkova, Analiz na metodite za opredelyane na dinamichnite harakteristiki na stroitelni mashini pri vzaimodeystvieto im s rabotnata sreda, Nauchno spisanie ”Mehanika, transport, komunikatsii”, Sofiya, 2019 g.
( [1] Галина Петкова, Анализ на методите за определяне на динамичните характеристики на строителни машини при взаимодействието им с работната среда, Научно списание ”Механика, транспорт, комуникации”, София, 2019 г. )

[2] Jens Borg, Andres Engstrom. Dynamic behavior of a soil compaction tamping machine. Master’s degree thesis, University of Karlskrona, Sweden, 1997

[3] Harry M. Coyle, Gary C. Gibson Z. Empirical damping constants for sands and clays. Journal of the Soil Mechanics and Foundations Division, https://vulcanhammer.inf o/

[4] Smith, E. A. L.. Pilc Driving Analysis by the Wave Equation. Transactions. ASCE. Val. 127,Proc. Paper 3306, Part I. 1962.

 

 

 

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