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Investigation on inertia characteristics of corncobs

100%

Kuzenko D. , Kuzenko L. , Vantukh Z.

2010

tom 09

nr 3-4

Application of image analysis to the identification of mass inertia momentum in electromechanical system with changeable backlash zone

84%

Tomczyk M. , Plichta A. , Mikulski M.

Applied Computer Science

2019

tom Vol. 15, no 3

87--102

This paper presents a new method of identification of inertia moment of reduced masses on a shaft of an induction motor drive being a part of an electromechanical system. The study shows the results of simulations performed on the tested model of a complex electromechanical system during some changes of a backlash zone width. An analysis of wavelet scalograms of the examined signals carried out using a clustering technique was applied in the diagnostic algorithm. The correctness of the earliest fault detection has been verified during monitoring and identification of mass inertia moment for state variables describing physical quantities of a tested complex of the electromechanical system.

Mass Moment Determination Using Compound Pendulum

84%

Pluta Z. , Hryniewicz T.

International Letters of Chemistry, Physics and Astronomy

2013

tom Vol. 3

85-100

This work has been performed to verify the existent knowledge on determination of the mass moment. For the experiment, a compound pendulum was used. The motivation to undertake these studies were experimental results indicating a big discrepancy in mass moments between the values coming from calculations using the definition formula and these obtained from the experiment. In relation to the axial moment the relative error equals 23.6%, whereas regarding the polar moment the error reached 56.4%. Considering the reason of that discrepancy we could find the existent theory not to be adequate. The theory is then considered in view of verifying first the mathematical pendulum and next the physical/ compound pendulum theory. The consideration has been focused on the description of accelerated motion cycle of both pendulums as it was enough to solve the problem. A source differential equation, which serves to solve any quantum phenomena, was used in the study. Then the course of creation of detailed characteristics of the phase of mathematical pendulum accelerated motion is presented as the basis to derive formula on the mass moment of a compound pendulum. At the end this new adequate theory was verified showing the relative error to be less than one per cent.

Identification of a Backlash Zone in an Electromechanical System Containing Changes of a Mass Inertia Moment Based on a Wavelet–Neural Method

84%

Tomczyk M. , Borowik B. , Mikulski M.

Applied Computer Science

2018

tom Vol. 14, no 4

54--69

In this article a new method of identification of a backlash zone width in a structure of an electromechanical system has been presented. The results of many simulations in a tested model of a complex electromechanical system have been taken while changing a value of a reduced masses inertia moment on a shaft of an induction motor drive. A wavelet analysis of tested signals and analysis of weights that have been obtained during a neural network supervised learning - have been applied in a diagnostic algorithm. The proposed algorithm of detection of backlash zone width, represents effective diagnostic method of a system at changing dynamic conditions, occurring also as a result of mass inertia moment changes.

Obliczanie pierwszej częstości drgań własnych wież kratowych o zbieżnych liniowo krawężnikach

84%

Jaworski J. , Zadrozny M.

nr 1

W pracy wyprowadzono i zestawiono wzory na zastępczy moment bezwładności dla wież o liniowej i kwadratowej zależności momentu bezwładności trzonu wieży od wysokości. Uwzględniono także wieże z krawężnikami o stałym przekroju, nachylonymi do osi wieży pod stałym kątem, przy założeniu, że cały moment bezwładności pochodzi od krawężników. Na przykładzie trzy odcinkowej (dwukrotnie załamanej), czterokrawężnikowej wieży antenowej wysokości H = 99,5 m i masie własnej stalowej konstrukcji m ~ 146 t przedstawiono porównanie obliczonych wartości pierwszej częstości (okresu) drgań własnych oraz ugięcia wieży pod działaniem siły poprzecznej przyłożonej do jej wierzchołka z wynikami otrzymanymi dla modelu wieży wygenerowanego w programie Robot Millennium.

Formulas for the effective moment of inertia of towers with the linear and the square dependence between the moment of inertia of the tower shaft and the height of the tower are derived and compiled in the paper. Towers with legs of a constant cross-section and constant sloping are also included, assuming that the whole moment of inertia results from the legs. Comparison of a frequency (period) of a first mode of natural vibration and of a tower head deflection calculated and computed using the Robot Millennium program is given for the model of aerial (antenna) steel tower 99.5 m high, with a pyramidal trunk shape, three sections, four legs and with the dead weight of ca. 130 ton.