Search Results

You are looking at 1 - 10 of 31 items for :

  • Environmental Management x
Clear All
Open access

Marek Kurnatowski

Abstract

The article describes the results of tests carried out to determine the measurable effect of vibrations on the accuracy of measurements with an automatic precise leveller. It contains specification of the research station created to examine the case and description of factors affecting the measurement results. The multi-frequency vibrations were forced on a leveller during measurements and calculated mean errors for each frequency analysed. The range of frequencies for which the measurement was possible was estimated. The obtained results can be helpful in the engineering measurements designing, especially in industrial areas, where vibrations are an inseparable element of the environment.

Open access

Natalia Lasowicz and Robert Jankowski

., Kwiecień A., Jankowski R.: Enhancing the seismic resistance of columns by GFRP confinement using flexible adhesive - experimental study, Key Engineering Materials, 624, (2015) 478-485. 8. Majewska-Lasowicz N., Jankowski R.: Modal analysis of a steel grandstand, Technology and Art, 3, (2012) 94-97. 9. Nhleko S. P., Williams M.S., Blakeborough A.: Vibration perception and comfort level for an audience occupying a grandstand with perceivable motion, Proc. of IMAC-XXVII, (2009). 10. Reynolds P., Pavic A., Ibrahim Z.: Changes of

Open access

Jelena M. Djoković, Dejan I. Tanikić, Ružica R. Nikolić and Saša M. Kalinović

, particle size, and duration of screening, International Journal of Mineral Processing, Vol. 52, No. 4, 1998, pp. 261 – 272. [7] CHEN, Y. H. - TONG, X.: Modelling screening efficiency with vibrational parameters based on DEM 3D simulation, Mining Science and Technology, Vol. 20, No. 4, 2010, pp. 615 – 620. [8] JIAO, H. G. - LI, J. R. - ZHAO, Y. M.: Test and research on optimum configuration of diameter of screen aperture and incline of screen deck, Coal Preparation Technology, Vol. 35, No. 2, 2007, pp. 1 – 4. [9] UMEHARA, S. - YAMAZAKI, T. - SUGAI, Y.: A

Open access

Maciej Major, Izabela Minda and Izabela Major

, Podręcznik użytkownika, 2014, http://docs.autodesk.com/RSAPRO/2014/PLK/index.html?url=filesROBOT (In Polish). [8] SCI P354: Design of Floors for Vibration: A New Approach The Steel Construction Institute (2007 Edition). [9] PN-EN 1991-1-4:2008, Eurocode 1: Actions on structures, Part 1-4: General actions – wind actions, PKN, Warszawa, 2008, (In Polish).

Open access

Bejan Sergiu

Abstract

The natural soil used in filling the embankment of the road communications is characterized by the following factors: humidity, porosity, toughness. For certain factor values that describe the soil state is distinguished a certain soil behavior under the influence of the external forces applied through static or dynamic mechanical means.

In this study are presented the numeric simulation results of the soil-compactor interaction based on the complex and nonlinear rheological model proposed by the author in the result of the elaborated doctorate thesis, that follows the real soil characteristics (elastic, dissipative and plastic) on those of the compaction equipment (with a single vibrating roll). The model was harmonised and granted in accordance with the results obtained from the processing of the experimental data. For the simulation model was used the specialized software package Matlab (Simulink, SimMechanics). The obtained results revealed the real behavior of the equipment and its action on the compacted soil.

Open access

Polidor Bratu and Ovidiu Vasile

]. D. INMAN: “Vibration with Control”, John Wiley and Sons Ltd., New Jersey, 2006. [10]. S. RAO: “Mechanical Vibrations” Fourth Edition, Pearson Education Inc., New Jersey, 2004. [11]. M. RĂDOI, E. DECIU: “Mecanica”, Editura Didactică şi Pedagogică, Bucureşti, 1977.

Open access

Traian Mazilu, Ionuţ Radu Răcănel and George Stoicescu

REFERENCES [1] M. DUMITRIU, I.C. CRUCEANU: “ On the rolling noise reduction by using the rail damper ”, Journal of Engineering Science and Technology Review 10 (6) , 2017 , 87-95. [2] A. CIGADA, S. MANZONI, M. VANALI: “ Vibro-acoustic characterization of railway wheels ”, Applied Acoustics 69 , 2008 , 530–545 . [3] T. KITAGAWA, D. J. THOMPSON: “ The horizontal directivity of noise radiated by a rail and implications for the use of microphone arrays ”, Journal of Sound and Vibration 329, 2010, 202-220 . [4] X. ZHANG, D. J. THOMPSON

Open access

Mária Kúdelčíková and Eva Merčiaková

Abstract

In structural dynamics models of mechanical oscillator and vibration analysis are of great importance. In this article motion of mechanical oscillator is modelled using second order linear autonomous differential systems. Stability of such 1 DOF models is investigated with respect to the coefficients of systems. Phase portraits for various cases are displayed and the character of fixed points is described.

Open access

Ján Kortiš, Ľuboš Daniel, Milan Škarupa and Maroš Ďuratný

References [1] DEKÝŠ, V. - ŽMINDÁK, M. – SAPIETOVÁ, A.: The application of modal analysis and condition monitoring for sound and vibration reduction. In: MITECH 2009 - Material Science and Manufacturing Technology, International Scientific Conference, 25.-26. June, Prague, Czech Republic. ISBN 978-80-213-1931-8, p. 61 - 66. [2] NUNO M.M. MAIA, JÚLIO M.M. SILVA: Theoretical and Experimental Modal Analysis. Research Studies Press LTD, July 1998. ISBN 0863802087. [3] KOUROUSSIS, G. - DESCAMPS, T. - BEN FEKIH, L. - VERLINDEN, O.: Application of

Open access

Veronika Valašková and Jozef Vlček

References [1] VALAŠKOVÁ, V.: The comparisons of computational models of pavement due to the dynamic load act. DYN - WIND 2017, MATEC Web of conference, 2017, DOI:10.1051/matecconf/2017107000. [2] FRÝBA, L.: Vibration of Solids and Structures under Moving Loads. ACADEMIA, Praha, Nordhoff International Publishing, Groningen, 1972. [3] MARTINICKÁ, I.: Calculation of Natural Frequencies and Vibration Shapes its own Computational Models of Vehicles Land. Communications and Tracks. Vol. 6 (1 - 2), 2010, pp. 41 – 50 (in Slovak). [4] DANIEL, L