Technique of compensating errors in machining of parts with sculptured surfaces

Machining of parts with sculptured surfaces using computer numerical control equipment and the control of their geometry is accomplished by 3D-models describing the master part. The article presents a technique of compensation of manufacturing errors, based on the incorporation of coordinate measuring of the part geometry in the machining process. The proposed technique involves changing of the machining program by restructuring 3D-model of the part according to the information on deviations obtained after the measurement. The technique allows the analysis of the measurement results and on-line correction of control programs for CNC metalworking equipment. The analysis of the measurement results consists in determining whether it is necessary to compensate the errors, and filtering the random error components not taken into account in compensation. Operational adjustment of control programs for metalworking equipment makes it possible to improve the quality of its products and the efficiency of production processes. The developed technique was implemented in the MATLAB application software package

Statistical analysis of angular and distance-measuring noises of real sea objects

On a basis of methodology of statistical characteristics of angular and distance-measuring noises of stretched objects there are represented calculations results for objects, which are closed to real sea ships. Concrete numerical values of these characteristics are obtained

A digital method for suppressing passive interference at the coordinate processing of radar image of protracted seaborne objects

The paper presents results of computer-aided simulation, usable for development and updating of channels of digital processing of coordinate information in coastal radar systems and ship traffic management systems under restricted navigation conditions

Optimal digital algorithms of coordinates definition of the reflection statistical center of length object

On the basis of a maximum likelihood method digital definition algorithms of angular and range coordinates of the radar image of length object in a point of the coordinate binding defined by the reflection statistical center are synthesized

Synthesis of the channel for forced tuning of Doppler tracking filter

Results of a channel of forced frequency tuning of tracking Doppler filter development are presented, where control oscillator with external synchronization is applied. There is theoretical description, filter principal circuits, the method of development and realization of the frequency discriminator, providing better characteristics in compare to existing ones and approximately identical fluctuation errors in case of filtering coefficient of  15–20. Operating band of forced frequency tuning of the channel is 0.01–2 MHz in case of high linearity of discrimination characteristic at the frequency modification band of  0.8 and temperature stability of the slope 1.5% at the interval of temperatures from –60 to +60 °C. There are represented main analytical relations, suitable for practical calculation

Digital model of radiolocation scattering by sea surface when it is probed by coastal radiolocation station

It is synthesized on a heuristic level a simplified variant of digital model of radiolocation scattering of a signal, when sea surface is probed. This model takes into account technical parameters and real geometric dimensions of coastal radiolocation station situation