The method of resolving power enhancement of analog-digital conversion path of jitter analyzers in fiber-optical networks is suggested in the research. The analog-digital path is designed on the basis of the principle of phase-plane correction of dynamic errors and is characterized by high resolving power.
The paper considers the modelling of the finely-dispersed non-coherent material flowing from the conic unloading hopper hole under the vibration disturbance of the flow with the conical bottom. There was presented the method for bringing Navier-Stokes equations that describe the movement of the non-coherent material under vibration, to the Lorenz model, based on which there were received graphic dependences, which allow forecasting the behavior of non-coherent material at the equipment projecting stage and controlling it by means of vibration intensity change as well as the unloading hopper hole parameters.
Experimentally calculated component of the physical model of motor vehicle destruction under shock loading is considered. The results of the development of methods for determining deformation energy of motor vehicles, damaged in road accidents, are presented. Model of studying the processes of motor vehicle deformation and destruction under shock loading conditions is elaborated. Accuracy of deformation energy determination by crash test-based methods is evaluated using experimental- calculation method of hardness. The possibility to determine the speed of motor vehicle motion at the moment of impact with accuracy, sufficient for the practice of carrying out auto-technical expert examination is shown.
Proposed in the paper are the new algorithms for vibration-based diagnostics of existing defects in hydraulic units. They are based on an artificial neural-like network, which implements spectral analysis of vibroacoustic signals using threedimensional amplitude-frequency-temporal spectra of these signals, such spectra being obtained using discreet wavelet transformation.
The paper analyses modern development status of temperature transducer on the basis of piroelectrics, represents and describes a new temperature transducer on the basis of transistor structure with negative differential resistance, simulates current-voltage and frequency characteristic of this device in the software environment Pspice.
KEYWORDS: Magnetism, Transducers, Transistors, Microelectronics, Resistance, Semiconductors, Magnetic semiconductors, Inductance, Electrons, Chemical elements
The analysis is carried out and the possibility of creation of microelectronic auto generator transducers of magnetic field on the basis of transistor structures with a negative resistance is shown. Characteristics of microelectronic auto generator transducers of magnetic field with Hall's elements with the broad range of frequencies from 103 to 107 Hz are offered and investigated, at the same time the sensitivity of devices changes from 103 kHz/mT up to 105 kHz/mT.
The concept of constructing functionally integrated sensors of thermal quantities is formulated on the basis of calorimetric methods of investigation, the novelty of which is the usage of components of solid-state microelectronics and multifunctional signal converters. The analysis and selection of organic materials has been carried out, and the green colored OLED has been formed with good output characteristics for temperature sensors. The spectral analysis of proposed structures is represented and the method of their obtaining is selected.
New approaches to ultrasonic measurements based on the use of the ultrasonic near-field zone and the resonance method are considered. the approaches can be used to measure such material parameters as density, thickness and humidity. simulation and obtained experimental results are given. a mathematical model of the ultrasonic resonance method for measuring material parameters is presented. shown simulation results and experimental data exhibit the high convergence which indicates the adequacy of the proposed model and allows offering a new class of ultrasonic methods for measuring control. a new approach to ultrasonic measurements based on the creation of ultrasonic wave selfoscillation conditions is proposed.
The paper contains the results of the research carried out to create new approaches to ensure the high accuracy of the precision detail’s manufacture, which will accurately determine the distance of the tool to the workpieces, which greatly affects the accuracy of the detail’s manufacture by the automated production. Purpose of the work was to create the principles of the operation of a two-parameter measuring probe for the control system of the workpiece’s setting relatively to the instrument. On based of the processing system of the informative parameters of complex electromagnetic fields (in particular, the optical range), which prevents the destruction of process equipment in the detail’s manufacture for precision devices. Consequently, the principles of construction of two-parameter electromagnetic systems of control and measurement of space-time coordinates of technological objects location in the workspace of the machine are proposed. The proposed action of the probe for the information-measuring system of contact provides an increase in the accuracy of the metalworking process during the manufacture of precision details of devices, which is especially important in the processing of metals on CNC machines.
In the paper a filter on the parallel resonant circuit on L-, C-negatrons is suggested. The parallel resonant circuit on L-, C-negatrons is investigated. Stability of the contour and frequency characteristics are considered. Experimental researches of the contour on the circuitry analogues of negatrons are conducted. Use of L-, C-negatrons improves the frequency-selective properties of the filter. Simulation of the filter on circuitry analogues of L-, C-negatrons on operational amplifiers LF400C is done. The simulation results showed improvement of frequency selectivity of the filter characteristics by reducing the phase distortion.
It is shown that there are not enough productive methods that can help project managers to create and choose the effective strategies of organizing software development process. By using designed algorithm and mathematical model it's possible to find associative rules that are informative and can help project managers with forming effective process of creating software.
In this paper considers the algorithm of laser beam spots image classification in atmospheric-optical transmission systems. It discusses the need for images filtering using adaptive methods, using, for example, parallel-hierarchical networks. The article also highlights the need to create high-speed memory devices for such networks. Implementation and simulation results of the developed method based on the PLD are demonstrated, which shows that the presented method gives 15-20% better prediction results than similar methods.
In the article the pressure transducer with frequency output based on the structure of the bipolar-field transistors with negative resistance and tenso sensitive MEMS capacitor has been considered. A mathematical model of the frequency pressure transducer in dynamic regime has been developed that allowed to determine the voltage or current in the circuit at any given moment in time when acting this pressure. Analytical expressions of the conversion function and sensitivity equation has been received. The sensitivity of the developed device is between 0,95kHz/kPa to 1,65kHz/kPa.
Thermoelectric properties of Si1-xGex (x = 0.03) solid solution whiskers doped with B impurities to the concentrations 1017 – 1019 cm-3 were studied in temperature range 300 - 420K. An influence of the whisker morphology, in particular their diameters and obliquity, on Seebeck coefficient, thermal conductivity and resistance was investigated. Seebeck coefficient and resistance was shown to increase, while thermal conductivity to decrease when the whisker diameter drops from 100 to 10μm, that is accompanied by a rise of figure of merit (up to 0,12 at 300K). Use of the whiskers with large obliquity leads to a small rise (of about 10 – 15%) increase of their Seebeck coefficient.
The paper investigated the possibility of measuring the resistive physical quantity generator using deterministic chaos based RL-diode circuit. A generalized structure of the measuring device using a deterministic chaos signal generator. To separate the useful component of the measurement signal of amplitude detector is proposed to use. Mathematical modeling of the RL-diode circuit, which showed a significant effect of the barrier and diffusion capacity of the diode on the occurrence of deterministic chaotic oscillations in this circuit. It is shown that this type deterministic chaos signal generator has a high sensitivity to a change in output voltage resistance in the range of 250 Ohms, which can be used to create the measuring devices based on it.
Thermal methods of nondestructive testing are widely used for the analysis of the thermal insulation of underground pipelines. In heat methadone nondestructive testing, the thermal energy is distributed in the test object. Temperature field of the object's surface is a source of information on the characteristics of heat transfer. This article describes the modifications we have developed some of the heat flux sensors. A common element of these devices is the battery thermoelectric sensor special design, acting as a thermoelectric converter heat flow.
In the paper is suggested new noncontact method of temperature measurement based on the phenomenon of the
luminophor temperature decreasing, is developed the construction of the primary measurement transformer, that
implements suggested method, and got its transformation equation.
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