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The article presents a hardware and software complex for the automated measurement of the pallet dimensions and defining of foreign bodies on the pallet surface. The block diagram of the system and the software are described. Methods to improve the accuracy of measurement of the geometric dimensions of the pallet are briefly described: temperature correction of the velocity of propagation of ultrasonic...
A modeling and experimental investigation on the detection of a dipole with a nonlinear semiconductor inclusion by baseband pulse test signals is carried out. It is shown that step signals give an advantage in sensitivity at limited amplitude of the transmitter output signal.
The Keysight B1500A semiconductor device analyzer based measurement system for test memory cells research is introduced. The connection of a device under test is described as well as the full list of the utilized equipment. The features of the Keysight equipment remote control by means of Keysight VISA are demonstrated; code examples in LabVIEW environment are also presented.
A new method of lay-out of a multilayer PCB for circuits with triple reservation is considered. Simulation of four-conductor structure is performed. In this structure UWB pulse decomposed to 4 pulses with smaller amplitudes. These results demonstrate that the proposed method allows to increase interference immunity of PCB circuits with triple reservation.
The parametrical analysis based on an estimation method of probability of non-failure operation of redundant trigger elements of memory is considered. Ratios and results of calculation are given. It is shown that the failure tolerance of basic flip-flops has the defining meaning for indicators of non-failure operation of memory cells for redundant circuits.
This article is devoted to increasing the energy efficiency of electric drives of installations of enterprises of housing and communal services, by justifying the use of systems of asynchronous and synchronous drives with frequency converters. It is shown that when throttling, the energy of the flow of a substance held back by a latch or valve does not perform any useful work. The method of solution...
The article reviews the feasibility of application of an autonomous photovoltaic power station. The study includes the selection of equipment and technical and economic feasibility of the photovoltaic power station operation.
The mathematical model of the power system load node is proposed. The main elements of the model are synchronous and asynchronous motors, a power transformer, power transmission lines and capacitor banks. The voltage instability of the electrical grid and the starting transients of the asynchronous motors are considered in the proposed model, in contrast to the counterparts. On the basis of this model...
This paper presents a footstep planning algorithm for a six-legged in-pipe robot moving in spatially curved pipes. The algorithm allows us to generate sequences of points on the pipe's inner surface where the contact pads of the robot should come in contact with the surface. The algorithm uses mapping of the pipe onto a two-dimensional surface with a simpler geometry. The algorithm plans footstep...
This paper presents the design of the monolithic pseudo-differential buffer amplifier based on 0.25 um SiGe BiCMOS technology for mixer local oscillator (LO) input. LO buffer amplifier is implemented using pseudo-differential cascode circuit with voltage parallel feedback circuit. Buffer amplifier designed for 1.5–5 GHz frequency band and has power gain Gt = 15 dB with 0.5 dB ripple, 1-dB compression...
The article considers a choice of CAD system and SPICE-models for the circuit simulation of characteristics of the bipolar (BiJFET) analog integrated circuits (IC) at the exposure of the penetrating radiation (PR) and the low temperatures. The authors suggest a modified SPICE-model, which describes the nonmonotonic change of the peak drain current and the slope of the p-n junction FET (JFET) within...
The article suggests a circuit method of increasing the upper frequency limit (fc) of the transimpedance differential amplifiers (TDA) for the BiJ, BiJFet, BiCMOS, CMOS and other processes. It shows that when entering the special compensating circuits into the TDA classical circuits, realized on the base of the “folded” cascodes and the symmetrical active loads, the upper frequency limit f6 is increased...
The electric strength level of the electronics is determined by serial impact of the EOS with increasing amplitude. EOS impact repeats until functional or parametric failure is registered. For the test it is important to determine the electric strength level with acceptable accuracy. This requires the decrease of the amplitude increment coefficient. However, decreasing the value of the coefficient...
The paper investigated the current-voltage and dI/dV-characteristics of nanocontact “Niobium — Carbon nanotube (5,5) — Niobium” using the program Atomistix ToolKit with Virtual NanoLab. At computer simulation of transport characteristics of nanocontact the method of nonequilibrium Green's functions and the local density approximation were used. The current-voltage characteristics, the differential...
Currently the special algorithms are used to determinate an initial position of rotor angle of the permanent magnet synchronous drives. This is especially important for providing of smooth load at the electric drive starting, for example, for gearless elevator hoist drive. For this the position sensors are used in simple electrical drives, but system cost is increased. Paper describes a developed...
This paper considers basic methods for high-precision synchronization of spatially-distributed reference oscillators of non-request measuring stations for GLONASS without their delivery to the location of frequency and time reference. New solutions for tropospheric and ionospheric error estimation and reduction during synchronization are provided.
The problem of control design formation is considered with a modification use of the local quadratic criterion, which allows to keep a part of vector component of the given state. Kalman's filter is used in order to assess the state of the object model The results of control system simulation for non-stationary model of the ship are given while changing course.
The possibilities of automatic control systems with PI2D-controller are discussed in this paper. It was proposed the procedure for the calculation of its parameters based on a modal approach. Comparative analysis of the system with PI2D-controller using numerical simulation in Matlab was carried out. The effect of the non-stationary object parameters and external disturbances was examined.
Mechanics nonlinearity of such a complicated plant as rolling mill leads to deterioration of transients quality for a main drive speed control loop. A main reason for that is linearity of P-control algorithm used for this loop. That problem can be overcome by controller parameter adaptation algorithms usage. In this research we propose to adjust speed P-controller online using a neural tuner. It is...
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