Перегляд за автором "Neyezhmakov, P."

Зараз показано 1 - 3 з 3
  • Зображення мініатюри
    Публікація
    Determination of the time constant of measuring transducers
    (Zakharov I. Determination of the time constant of measuring transducers / I. Zakharov, P. Neyezhmakov // Measurement: sparking tomorrow’s smart revolution XXIII IMEKO World Congress “ August 30 September 3, 2021, Yokohama, Japan, 2021) Zakharov, I. P.; Neyezhmakov, P.
    The methods for the experimental determination of the time constant of measuring transducers are described. The method is based on determining the parameters of the steady-state response of the measuring transducer using a periodic sequence of rectangular pulses of known time pulse and repetition period as an input signal. Expressions for determining the time constant for various response parameters: maximum, minimum, average, and average rectified values are given. The evaluation of the measurement uncertainty for each of the obtained expressions is made. The proposed method has high accuracy and low labour intensity in comparison with the known graph-analytical methods.
  • Зображення мініатюри
    Публікація
    Reduction of auto seismic oscillations of the ballistic laser gravimeter on account of the excitation of the induction-dynamic catapult by a pulse packet
    (Український метрологічний журнал, 2020) Bolyukh, V.; Vinnichenko, O.; Omelchenko, A.; Neyezhmakov, P.
    In order to reduce auto seismic oscillations in the ballistic laser gravimeters (BLG) with a symmetric method of measuring the gravitational acceleration (GA), an induction-dynamic catapult (IDC) is used, which is excited by a pulse packet from a capacitive energy storage unit (CES). With such excitation, a decrease in the amplitude of auto seismic oscillations is achieved by reducing the amplitude and increasing the duration of action of the electrodynamic force that occurs in the IDC when pushing the test body (TB). A mathematical model of the IDC of the ballistic laser gravimeter with a symmetric method of measuring the GA is developed and the modeling of its electromechanical characteristics is carried out. Various methods of generating a packet of excitation pulses of the IDC inductor are considered and the characteristics of electrodynamic force pulses that accelerate the armature of the catapult with TB are investigated for them. The effect of IDC excitation by a pulse packet on the auto seismic component of the GA measurement is investigated. It is shown that on account of the excitation of the IDC by a ten-pulse packet, the auto seismic component of the uncertainty of the GA measurement by ballistic gravimeters can be reduced several (3–5) times in comparison with the excitation of the catapult by a single pulse.
  • Зображення мініатюри
    Публікація
    Reduction of the measurand estimate bias for nonlinear model equation
    (Journal of Physics: Conf. Series, 2018) Botsiura, O. A.; Zakharov, I.; Neyezhmakov, P.
    The biases arising in the calculation of the measurand estimate at nonlinear measurement models are considered. The possibility of reducing these biases by applying the finite increments method is shown.