The problems of definition of phase shift on the windings of transformers are considered. A method for measuring the phase shift is proposed, and a methodical error is investigated for signals with different distortion levels. An example of the implementation of the proposed method for the automated phasing of transformer windings is given. The possibility of applying the proposed method for parametric control of transformers using arbitrary waveforms is shown.
Block diagram of adaptive wideband converter of alternate harmonic voltages frequency to binary code is suggested. Adaptation algorithm is considered. Results of analysis of accuracy, conversion time, and time of initial adaptation are presented.
The method of distribution changing scheme by wireless audio sensor networks operation is described. A task of lifetime maximization is given, and results of simulation are shown. Assumptions about applicability of proposed method by audio data transfer over Wireless Audio Sensor Networks are made.
Issue of identification emergency electrical discharge for electrical network is studied. Structure chart of detector is shown. Algorithm of DSP module is offered. Timing diagram of identification process and realization example of algorithm in Matlab is given
Bandwidth distributed algorithm for interface of input signal subsystem is developed. Algorithm is based on weighting coefficient method related to speeds of thread and verified in MatLab. Example of registration system and timing diagram is shown.
Comparative analysis of the metrological performance of authors' and conventional data input modules is presented.
Architecture of the compressor equipment cyber-physical system (CPS) based on the InfluxData IoT platform is proposed. CPS consists of three subsystems: a subsystem of a physical object,
a digital twin and an interface. As a technical implementation of the IoT controller, a measuring and control module based on a data acquisition, data transfer and control device — VIDA350. The basic methods of processing raw data from energy meters and sensors of technological parameters, implemented in blocks of on-line and offline calculations are given. The organization of the digital twin of the compressor using the database of time series InfluxDB and the relational database PostgreSQL. Grafana system and FreeCAD is used for visualization of equipment in 3D.
This work considers the problem of designing the architecture of a network management system for a generic module of a modern automated building. To improve the efficiency of building operation given the large influx of data, the architecture of the network management system implements multicontour management of a generic modules using cloud scenarios. Building operation efficiency is enhaced by using data mining blocks in the external control loop to detect the systematic behavior of users of a generic building module. This is based on data from IoT controllers, statistical processing of information on the system's server and generation of control actions in automatic and / or automated modes. As a technological base of the building management complex, a set of Internet of Things devices (IoT) is considered. The implementation of control algorithms for a typical intelligent building module is described by a software program model, for example, in the form of logical structure algorithms
An indirect measurement technique for temperature fields of car tires and temperatures of brakes is discussed. The technique is based on a mathematical model of tire heating. Model parameter identification methods, simulation and experimental results and included.
An example of the construction of acceleration sensors based on fiber-optical displacement transducers with external modulation. Designed the prototype of fiber-optical accelerometer and tested according to the elaborated methodology.
The paper focuses on the task of increasing efficient operation time of autonomous resource-constrained sensors in Industrial Internet and on dynamic assignment of communication protocols as the possible solution. A model of a network of communicating intellectual sensors is given, which presents the process of data transmission as consumption of multiple resources. We quantitatively assess advantages of using dynamic protocol assignment and suggest the application conditions.
The paper discusses optical methods for linear and angular measurements based on new information technologies.
The task of developing the functionality of typical Internet of Things (IoT) platforms to the level of using custom predictive models in energy management of buildings, structures and industrial facilities in the day-ahead mode is considered. Predictive control scenarios of both single loads (consumers) and their aggregated groups can be used to reduce energy consumption during the combined maximum hours of the region, grid capacity hours, as well as in the implementation of electricity demand response events. Universal forecasting methods (black-box methods) based on linear regression, baseline, neural network, autoregressive, triple exponential smoothing (Holt-Winters model), autoregressive model with seasonality support (SARIMA) and methods based on ensemble models are considered as examples. A scheme for integrating computational and analytical models with IoT platforms InfluxData and EMS INSYTE is proposed. The new architecture provides the execution of various short-term energy forecasting models on the analyst server. The results of experimental research of the performance of custom analytics in the composition of IoT platforms in the implementation of ventilation predictive control scenarios for the day ahead are presented.
The structure and operation algorithm for an electronic reference book on non-electrical measurements are considered. The reference book comprises both databases and knowledge bases.
The questions of mathematical modeling of fiber-optic sensors with external modulation. Investigated the effect of the parameters of fiber-optic channels to conversion function.
The features of operation of the inductive transducers. The algorithm of correction of non-linearity and hysteresis of conversion function of inductive transducers. A virtual instrument for the implementation of the proposed algorithm. Experimental research on the effectiveness of the proposed algorithm using a differential inductive transducer of linear displacement.
Measurement technique is proposed that makes it possible to control the resistance of a large number of low-resistance objects taking into account the resistance of lead wires and switching elements. An example of the implementation of the proposed method with the data acquisition/switching system HP34970A is given.