FIELD: measurement technology. SUBSTANCE: method is intended for construction of mathematical model of complex dynamic system with distributed parameters. It can also be used in analysis of non-stationary processes in mechanical, electromechanical and electric systems. Method is based on excitation of oscillations of system by harmonic action in range of its natural frequencies and on recording of amplitude- phase frequency characteristic of measured kinematic parameters. Characteristic frequencies corresponding to extreme of actual and imaginary components of kinematic parameter are recorded per each degree of freedom of system. Time constants and gain factors are calculated by these frequencies. Specific feature of this method lies in use of double integral of output signal of oscillatory system in the capacity of kinematic parameter and in presentation of transfer function of system in the form of double integral of sum of transfer functions of oscillatory links. Method allows random noise with zero average value to be practically excluded and accuracy in determination of time constant of dynamic system to be increased by this. EFFECT: increased accuracy in determination of time constants of dynamic systems. 2 dwg
