The synthesis of control algorithm over a technical condition of the hydrogen generators based on hydro­reactive compositions

Basmanov

et al. 2021

EEJET

Self Cite

A method for determining the dynamic parameters of the operator of a mobile fire engine based on a segway, which fully characterize its dynamic properties – delay time and inertia was developed. The development of the method includes four stages. At the first stage, the problem of obtaining analytical relationships for determining the dynamic parameters of the operator is solved. These relationships include the frequency characteristics of the operator at a fixed frequency and its static parameter. At the second stage, the choice of a fixed frequency is substantiated using a criterion that minimizes errors in determining the dynamic parameters. It is shown that the fixed frequency for the characteristic parameters of the operator does not exceed 0.5 Hz. The third stage includes substantiation of the procedure for determining the frequency characteristics of the operator and its static parameter. The frequency characteristics of the operator at a fixed frequency and its static parameter are determined numerically. This procedure is based on using the data obtained by measuring the values of the operator’s transfer function at fixed time intervals. To obtain data, an interactive analog engine is used, which can also perform the functions of a simulator. The time intervals are chosen according to the Kotelnikov-Nyquist-Shannon theorem. At the last stage, the procedure for determining the dynamic parameters of the operator of a segway-based mobile fire engine is described. It is shown that the error in determining the dynamic parameters of the operator of a mobile fire engine does not exceed 9.0 %, if the error in determining its frequency characteristics at a frequency of 2.5 s–1 does not exceed 2.0 %

Section: Methods For Determining the Dynamic Parameters Of The Operatormentioning

confidence: 99%

“…At each of the time points separated by the value Δt, the gain Δu k of the signal u(t) is measured [20]:…”

Section: Formalization Of the Procedures For Determining The Frequency Characteristics Of The Operatormentioning

confidence: 99%

See 1 more Smart Citation

Developing a method for determining the dynamic parameters of the operator of a mobile fire engine based on a Segway

Basmanov

et al. 2021

EEJET

Self Cite

“…Слід зазначити, що стосовно до систем зберігання та подачі водню результати контролю їхнього технічного стану не використовуються для одержання оцінок показників надійності. Для оцінки технічного стану систем зберігання та подачі водню використовується допусковий критерій [10].…”

Section: аналіз останніх досліджень і публікаційunclassified

Algorithm for Determination of Reliability Indicator of Gas Generator of Hydrogen Storage and Supply System

Mikhailyuk

2021

MEC

An algorithm for determining one of the indicators of reliability of the main element of the hydrogen storage and supply system – a gas generator has been developed. Such an algorithm is an integral part of the general algorithm to ensure the required level of fire safety of hydrogen storage and supply systems. The algorithm involves the implementation of several stages. At the first stage, using the expression for the amplitude-frequency characteristic of the gas generator, the functional dependences for its time constants are obtained. These functional dependencies include the values of the transmission coefficient and amplitude-frequency characteristics, which are determined at three a priori set values of frequency. In the second stage, the amplitude-frequency characteristic of the gas generator is determined. For this purpose, an array of data is used, which characterizes the reaction of the gas generator to the test effect in the form of an abrupt change in the area of its outlet. The amplitude-frequency characteristic of the gas generator is determined numerically, and its parameters are the increase in the pressure in the cavity of the gas generator and the time interval at which this increase is determined. The Kotelnikov-Nyquist-Shannon theorem is used to determine this time interval. At the third stage, the probability of the values of the time constants of the gas generator outside the tolerance zone is determined. For this purpose, models of gas generator time constants and their metrological characteristics are used. In the fourth stage, the probability of failure of the gas generator is determined, for which the information of the previous stage is used. At the last stage, the algorithm for determining the probability of failure of the gas generator of the storage and supply system of hydrogen, which is given in verbal form.

“…Як правило, алгоритми контролю систем зберігання та подачі водню є простими і передбачають контроль одного або двох параметрів процесу генерації [8]. В останній час з'явились роботи, в яких розглядаються частотні методи контролю технічного стану систем зберігання та подачі водню і їх основного елементагазогенератора [9]. В зв'язку з цим доцільним є узагальнення відомих результатів по контролю газогенераторів систем зберігання та подачі водню в частотній області.…”

Section: аналіз останніх досліджень і публікаційunclassified

Phase Methods of Gas Generators Control Hydrogen Storage and Supply Systems

Mikhailyuk

2021

MEC

Methods of control of technical condition of gas generators of systems of storage and supply of hydrogen based on use of their phase-frequency characteristics are considered. Methods of control of gas generators are divided into two groups depending on the mathematical models used to describe the operation of such gas generators. It is shown that when using as such a mathematical model the transfer function of the gas generator in the form of an inertial link, it is possible to implement control algorithms both by its phase-frequency characteristics and by its time constant. In the first case, the phase-frequency characteristic is measured at an a priori set frequency. In the second case, there is no such restriction. When using as a mathematical model of the gas generator the transfer function in the form of a fractional-rational function of the second order, the implementation of algorithms for its control can be carried out directly using the phase-frequency characteristics of the gas generator. With this implementation of algorithms for monitoring the technical condition of gas generators, the measurement of the values of their phase-frequency characteristics is carried out at several frequencies. This approach to the control of gas generators can increase the reliability of its results. All methods of monitoring the technical condition of gas generators of hydrogen storage and supply systems are focused on the use of tolerance criteria. The parameters of the tolerance criteria can be both the values of the time constants of gas generators of hydrogen storage and supply systems, and fixed values of the phase-frequency characteristics of such gas generators. In the latter case, control algorithms are implemented that cover the entire operating frequency range of gas generators.