Open AccessMODAL VIBRATION DIAGNOSTICS OF LATHES DESIGNS
Author(s) -
Александр Бренгауз,
Александр Бренгауз,
A. A. Molchanov,
A. A. Molchanov,
Сергей Досько,
Сергей Досько,
Павел Быков,
Павел Быков
Publication year - 2016
Publication title -
vestnik brânskogo gosudarstvennogo tehničeskogo universiteta
Language(s) - English
Resource type - Journals
ISSN - 1999-8775
DOI - 10.12737/22079
Subject(s) - modal , modal analysis , rigidity (electromagnetism) , vibration , modal testing , engineering , structural engineering , groove (engineering) , mechanical engineering , machine tool , normal mode , finite element method , acoustics , physics , materials science , polymer chemistry
In the paper the problem of reasons elucidation in the matter of lathe instability at groove cross turning and boring is solved. As a tool for the analysis of a structure state there are used potentialities of modal monitoring, and in particular, a correlation of modal parameters, sets of proper characteristics of an elastic system (self-frequencies, modal coefficients damping and own forms of vibrations) of lathes designs with the state of bearings in spindle units. The application of a modal approach to the evaluation of a lathe design state or an elastic system is a new section in a dynamic analysis and may be called modal diagnostics. From the analysis of the modal parameter values of a lathe one traces their tie with the lathe design characteristics, and in particular, with the existence of sever rigidity anisotropy of a spindle unit front bearing and also with its insufficient tightness. Reasoning from the information mentioned of the modal parameters connection with the rigidity of a spindle unit front bearing and a state of bearing design the authors draw a conclusion of the technological state of a spindle unit design. In such a way, by the example of the design of two lathes in the paper there is shown a possibility of transition from experimental frequency characteristics through a procedure of modal diagnostics to the evaluation of the technological state of a spindle unit.