TO METHODOLOGY FOR IMPROVEMENT OF ACTIVE VIBRO-PROTECTION WHILE USING FUNCTIONAL DIAGNOSTICS
The paper investigates vibro-protection conditions for “operator-chair” system of a transport facility (“Belarus-tractor family). Experimental research for the system vibroloading with due account of elastic shock-absorbing characteristics, operator’s comfortability. The paper has made it possible to determine a range of the system vibration frequency which is badly sustained by the operator because the last is located in the zone of natural frequency of human visceral organs vibrations. Influence of physiological operator’s factors - heartbeat rate, variational height, mode amplitude, stress index has been investigated on the basis of a factor experiment and correlation dependences have been obtained in the paper. The developed methodology for investigation of algorithmic provision pertaining to better active vibroprotection of the “operator-chair” system presupposes an availability of mathematical model used for synthesis of control laws and selection of algorithms for formation of signals on physiological operator’s state. Structural algorithm scheme for vibroprotection of “driver - seat - road” system has been drawn in the paper.Harmonic sinusoidal and poly-harmonic disturbances from the side of a power unit and discrete algorithms based on filtration of white noise with a linear filter and prescribed correlation function have been accepted as a mathematical model for external environment disturbances. In case of harmonic excitation of “operator - chair” system a force transferred to the system by a shock-absorber and also shock-absorber efficiency evaluation in the form of force transmission coefficient and vibration insulation value are estimated at decibels. Fourier’s series describes motion of the system in case of vibration forces initiated by the operation of the power unit. Piecewise-linear function describes a reaction on impact excitation of the system when final change in speed and motion quantity occurs. Quality evaluation of the vibro-protection system is determined as ratio of maximum effort transmitted by the system to maximum value of impact excitation. Decision support system, in other words a controlling system, consists of two circuits: the first circuit organizes work with information forming correlations between great number of input and output signals and the second circuit consisting of blocks for state evaluation and decisionmaking organizes work with qualitative information.