SovietRxiv · Open Access in English
Rediscovering the Soviet scientific archive, in English
25357 full-text translations 14926 English PDFs 22539 abstracts
Showing 50 of 25357 papers
This paper examines analysis and synthesis problems for Boolean functions realized by threshold elements and threshold networks. It develops an analysis approach using generating functions, relating threshold functions to symmetric Boolean functions, isobaric families, and transformations of weight …
A method is proposed for constructing a variable-shape voltage pulse generator by representing a desired pulse envelope as a level-quantized step curve, summing equal-amplitude rectangular quantization pulses, and smoothing the result with an adjustable low-frequency filter. The central design task …
This paper describes the design and testing of a low-frequency random-signal generator intended for analog simulation and testing of dynamic and automatic-control systems affected by slow random disturbances. The proposed circuit uses a thyratron noise source, amplification, band-pass formation of n…
This paper proposes a method for rapidly estimating the spectral density of a stationary random process using only an analog computer. The approach treats the computer model as a tunable conservative second-order element, squares and integrates its output, and relates the resulting variance growth t…
This paper describes a nondestructive device for monitoring the hardness of pressure-gauge spring blanks made of 50KhFA and 30KhGSA steels. The instrument uses the experimentally observed relationship between hardness and magnetic properties, measuring an increment of dynamic coercive force at indus…
A modified Owen bridge method is presented for measuring instantaneous active and reactive components of a periodically varying complex impedance, with application to dynamic reversible permeability in ferromagnetic specimens. The approach uses a high-frequency bridge supply, selective amplification…
This paper examines eddy-current sensor designs for nondestructive inspection of heated cylindrical nonmagnetic bodies, where high temperature complicates construction and reduces sensitivity. Several feed-through and slotted sensor variants with water or air cooling are described and experimentally…
This paper examines the problem of separating the effects of diameter and electrical conductivity in eddy current testing of cylindrical nonmagnetic products. It derives relative sensitivity expressions for several sensor output parameters, including reactive and active resistance, impedance, qualit…
This paper examines oscillator-based measuring circuits for eddy-current tolerance inspection of the dimensions and electrical conductivity of nonmagnetic products. It compares single-generator, two-generator differential, and periodic-comparison arrangements, emphasizing frequency measurement and t…
This paper examines design problems in amplitude-phase spectrum analyzers that implement Fourier-transform algorithms for periodic signals. It compares hardware approaches in terms of measurement error, focusing on multiplier accuracy, integration or filtering errors, harmonic interference from swit…
This article presents a circuit for comparing measured voltage amplitudes with a stabilized reference using bipolar rectangular pulses, electromechanical commutation, diode limiting, and an oscilloscope as a null indicator. It describes the formation of the reference voltage, the use of low capacita…
This paper presents a topological method for evaluating transmission sensitivity in electrical circuits, avoiding the cumbersome cancellations that arise in direct differentiation of a transfer function with respect to a branch parameter. The authors prove that the sensitivity of a transmission to a…
This paper applies a general method for finding statistical properties of random chords in convex bodies to the case of an ellipsoid with arbitrary orientation. Using coordinate transformations, projection onto a plane, and integration over the projected region, it derives formulas for the mean chor…
This paper examines how to determine moments of the length of a random chord in a convex body, a problem arising in probabilistic geometric models of random media based on random secants. It formulates the invariant measure on the space of lines, derives the standard relation between mean chord leng…
This paper addresses the practical problem of deriving an analytic empirical formula from tabulated or instrument-recorded data for engineering applications. It outlines an algorithm for choosing among seven two-parameter monotone function forms by comparing mean-based diagnostic equalities, then li…
This paper addresses the analog-computer modeling of planar mechanisms of the third class, a case not covered by earlier methods focused mainly on class-II mechanisms. It proposes decomposing a class-III mechanism with a three-driver group into two planar four-link mechanisms with variable link leng…
This paper addresses the automation of axonometric drawing on a digital computer through more economical encoding of geometric information. It develops formulas for converting coordinates from Monge projections to an axonometric image and proposes representing a solid by unordered lists of projected…
This paper addresses the solution of polynomial equations on analog computers using Monte Carlo techniques, arguing that a direct transfer of the conventional digital Monte Carlo approach is inefficient for continuous analog computation. It formulates the complex polynomial root problem through real…
This paper describes a program for the Promin small digital computer that prepares analytically specified nonlinear functions for use on analog computer universal function converters. The program rescales the argument and function values to converter voltage ranges, constructs a piecewise linear app…
This paper describes a program for preparing nonlinear functions for implementation on analog computers by piecewise linear approximation of functions specified as discrete experimental points. The algorithm constructs a broken line through the data such that deviations from the original points do n…
The paper examines S. N. Bernstein’s first interpolation process when both observed ordinates and interpolation nodes are known only approximately. It models these uncertainties probabilistically and derives estimates for two irreducible error components: one caused by errors in the readings and the…
This note examines unavoidable errors of the second kind in mean approximation by trigonometric polynomials when the approximating series is locally smoothed. Using the averaging operation corresponding to sigma multipliers, the author derives expressions and bounds for the smoothed error and compar…
This paper analyzes the root mean square component of approximation error in least squares trigonometric polynomial fitting that is caused by uncertainty in the locations of sampling nodes. Treating the node positions as random variables with prescribed means and equal variances, while keeping the o…
This paper describes small scale automation techniques for the Ural-11B digital computer aimed at reducing routine programming work and input preparation. It proposes a relocation program that replaces conditional calls to standard library subroutines with actual calls, automatically copies the requ…
This paper presents an interpreting system for the Ural-11B computer intended to overcome the limited accuracy of its standard 24-bit floating-point representation. The system represents numbers in two adjacent cells with a 36-bit mantissa and 12-bit exponent, defines overflow and underflow behavior…
This paper presents a modified subroutine for computing sine and cosine in floating-point mode on the Minsk-1 digital computer. It examines limitations of the existing standard routine, including loss of mantissa digits for small arguments, incorrect results for arguments with large orders, and a no…
The paper addresses time analysis of large network graphs on computers with limited random access memory, where direct use of magnetic tape as working storage makes computation slow and unreliable. It proposes exploiting block structure by reducing each block to aggregated activities between boundar…
The article addresses the manual bottleneck in constructing network schedules for automated network planning and control systems. It proposes an algorithm that, from a tabular list of development jobs and their immediate predecessors, assigns ordered event codes, introduces the necessary dummy activ…
This article describes a program under development at the Tomsk Polytechnic Institute for compiling class timetables on the Ural-11B electronic digital computer. It formulates the scheduling problem as the distribution of teaching assignments across a planned period subject to constraints on instruc…
This paper addresses the automation of university class timetabling, focusing on the preliminary problem of encoding educational process data for computer processing. It proposes a broader program system for schedule generation, classroom assignment, decoding, reporting, and classroom utilization an…
This paper experimentally examines theoretical stress solutions for axisymmetric cold extrusion, focusing on the validity of the Haar and Karman complete plasticity assumption and related ideal plasticity calculations. Using an experimental computational method combining hardness measurements and di…
This paper analyzes the operation of a synchronous generator without, or with only a weak, damper system when supplying a directly coupled thyristor frequency converter. Using simplified harmonic and magnetomotive force representations, the authors show that converter control produces modulation of …
This paper examines torque formation in an induction motor driven by short voltage control pulses, where electromagnetic transients can significantly affect average torque and losses. It introduces a reduction coefficient for average torque during a pulse relative to steady state, then analyzes the …
The paper develops a calculation method for selecting functional parameters of a variable-frequency asynchronous induction motor so as to minimize an integral indicator of specific annual reduced costs over a prescribed frequency range. Using an equivalent-circuit expression that accounts for magnet…
This paper formulates methodological principles for optimizing the parameters and control modes of AC electric motors operating over a variable current-frequency range. It argues that optimization must account for performance at each operating frequency, frequency-dependent constraints such as heati…
This paper examines bearing wear as a factor in the reliability of asynchronous motors and argues that bench tests are insufficient for assessing bearing assemblies under real operating conditions. Twenty-four AO2 series motors were tested for up to 10,000 hours with specified loads, greases, and be…
The paper studies an electromechanical equivalent of autonomous energy generators, focusing on how variations in correction-circuit parameters, feedback coefficients, and the electromechanical amplifier time constant affect its behavior. Using a signal-graph representation, Mason’s formula, and sens…
This paper analyzes the sensitivity of a transverse-field electric machine amplifier with a smooth armature to variations in its internal parameters during operation with an active-inductive load. Using a dynamic equation system, signal-graph representation, Mason’s formula, and sensitivity theory, …
This paper examines direct-current electric machines with combined excitation, whose inductors include both electromagnetic poles and permanent-magnet heteropolar systems. The authors compare such machines with equivalent fully electromagnetic machines by deriving normalized no-load characteristics,…
This paper investigates longitudinal-transverse excitation as a means of increasing the output power and improving the current pulse shape of an impact generator. It argues that adding an independently pulsed excitation winding on the transverse rotor axis can increase the resultant excitation flux …
This paper analyzes additional eddy-current losses in stator-winding bars placed in the air gap of synchronous machines with a smooth armature, a design proposed to reduce stator mass and leakage reactance in pulse-power generators. Using a vector-potential formulation of Maxwell’s equations under s…
This paper examines initiation of an interelectrode gap in water for electrohydraulic seismic sources using an auxiliary high-voltage winding in a single-phase impulse generator, allowing the main energy supply to be provided by a lower-voltage, lower-resistance winding. The authors formulate the in…
This paper examines initiation of an underwater arc gap by discharging a high-voltage capacitor bank, with subsequent arc takeover by a low-voltage impulse generator. The transient discharge circuit is modeled with a nonlinear time-dependent gap resistance, including leader formation and arc-channel…
This paper examines transient behavior in a synchronous generator suddenly connected to a symmetrical active load, a case in which stator resistance and rotor electromagnetic asymmetry cannot be neglected. Using Park-Gorev equations, the authors derive an approximate analytical solution that neglect…
This paper analyzes synchronous motor drives for centrifugal vibrators used to generate frequency-controlled seismic oscillations. Using an electromechanical analogy, the authors derive frequency characteristics for the vibration system, torque components acting on the motors, and load-angle oscilla…
This paper develops a method for thermal calculation of asynchronous electric motors operating under randomly varying load, addressing the limitations of classical heating checks based on deterministic load diagrams. The motor is modeled as a stationary linear dynamic system with the squared load cu…
This paper addresses the calculation of air-gap field shape factors for alternating-pulsating electrical machines with magnetically soft pole shoes, where unequal pole widths and changing induction ratios prevent direct use of coefficients for conventional synchronous machines. Using an approximate …
This paper derives expressions for the armature reaction inductive reactances of alternating pulsating machines, whose magnetic systems combine permanent magnet poles, field winding poles, and axial magnetic paths. Using an equivalent magnetic circuit and superposition for a linearized system, the a…
This paper examines asynchronous starting of synchronous reluctance geared micromotors using solid rotor inclusions, motivated by the poor loaded starting performance of designs without special starting devices. Experimental mockups with rotors assembled from plates of varying thickness, from 0.5 mm…
