On Measurement and Processing Data of the Real Loading: Application to Cement Equipment Components

Abstract

Considering the real task of modern calculations of strength, reliability and durability of a system (or its components) is an actual and important means to achieve many advantages: (a) more precise calculations of the strength, leading to more accurate dimensions (in general—lower) of the product which in turn causes other cost advantages: lower manufacturing cost and lower operational energy costs; (b) a good assessment of the reliability and durability of the product; (c) as a result a better planned and predictive maintenance. The research in field remains open today because the literature does not provide accurate indications regarding: (a) consideration of real loading in calculations, (b) measuring, processing and interpretation of experimental data to develop models of loading. Research objectives in this field were developed to a good investment programming to modernize or rehabilitate a vibrating screen (1,000 … 1,200 t/h) integrated in cement fabrication flow sheet. Measurements of un-modulated real loadings on one of the lateral case wall of the vibrating screen were made. A measuring methodology procedure and an appropriate measuring chain proposed previously by authors (Dobre et al., On the methods to measure the real loading at mechanical systems. In: The 7th international conference research and development of mechanical elements and systems—IRMES, Nis, Serbia, pp 395–400, 2011). The measurement chain was configured by high performance components with relative low costs (strain gauge signal amplifier, acquisition card, computer with large memory, high frequency processor, etc.). The experimental data are counted after this measurement and mean-amplitude frequency matrix is obtained. The loading spectrum for different stages and conditions of operating resulted. Finally conclusions about the main approaches and results of the paper are noted. The processing methodology of the experimental data could be extended to the entire structure of the cement equipment. The paper continues previous researches developed by the Romanian school in this area (Dobre et al., On the Real loading modelling of the mechanical systems. Fiabilitate şi Durabilitate/Fiability and Durability, Nr 1, pp 1–6, Editura Academică Brâncuşi, Târgu Jiu, ISSN 1844-640X, 2010), (Mirică et al., On the theoretical-experimental modeling of loading of the mechanical transmissions. In: Proceedings of 3rd international conference on power transmissions, Kallithea—Chalkidiki, Greece, pp 291–296, ISBN 978-960-242-662-2, 2009), (Dobre et al., On the loading modeling of the mechanical systems. In: The 13th international conference on machine design and production, 03–05 Sep 2008, Istanbul, Turkey, vol II, pp 417–480, 2008).