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卷 38, 编号 5 (2018)
- 年: 2018
- 文章: 20
- URL: https://journals.rcsi.science/1068-798X/issue/view/14028
Article
Reducing Transient Vibrations due to Rotating Shafts
摘要
An approach is proposed for calculating the transient torque imbalance of rotating shafts in the diesel generators of autonomous power units. The maximum shear strain of the rotor shaft in the generator is assessed by the finite-element method.
335-341
Oscillations in the Mechatronic System of a Multi-Stand Rolling Mill
摘要
The mechatronic system of the DUO-300 rolling mill is analyzed. The influence of the roller’s linear velocity on the distribution of frictional forces in the rolling region is studied. A nonlinear relation is found between the load and the roller speed. The conditions of self-oscillation in rolling are determined. Methods of damping the self-oscillation are considered.
342-347
Synchronizing-Cone Blanks with a Sprayed Steel Coating for Vehicle Transmissions
摘要
Blanks for synchronizing cones with a sprayed steel coating that are capable of operating in oil within vehicle transmissions are considered. A plasma-spraying method is developed for the manufacture of such components.
348-351
Markov-Chain Description of Powder-Coating Wear in Slipping Friction
摘要
A statistical approach based on Markov chains is proposed for the description of powder-coating wear in slipping friction. A matrix of transition probabilities for Markov-chains corresponding to steady wear is obtained.
352-357
The Theory of Discontinuous Cutting
摘要
Cutter entry and exit at the workpiece considerably influence the tool life. It is established that an adequate model of the cutting process during tool entry and exit remains to be developed.
358-359
Cutting Force in the Machining of Quenched 40Kh and KhVG Steel by Ceramic Tools
摘要
The influence of the supply on the cutting force is established in the machining of quenched steel by VOK-60 cutting ceramic. The optimal machining conditions for quenched 40Kh and KhVG steel workpieces are determined.
360-362
Limiting State of High-Speed Drills
摘要
Drill failure is due to the predominant wear of the rear surface or ribbon, depending on the range of cutting speed. Such wear is accompanied by increase in the cutting torque to critical values. Formulas are derived for the limiting permissible wear.
363-367
Disk Profile for the Machining of Helical Channels
摘要
A shaping method is proposed for disk cutters used in machining helical channels on tools and machine parts. The method employs a CAD system.
368-370
Effect of Initial Mechanical Anisotropy of the Pipe Blank in Expansion by a Conical Punch
摘要
The forces involved in the expansion of a pipe blank by means of a conical punch are analyzed by solving the approximate differential equilibrium equation, together with the corresponding fluidity condition. The influence of the initial mechanical anisotropy of the blank on the force and stress in the deformation region is established.
371-375
Benefits of Cold Plane Finishing
摘要
For cylindrical and annular workpieces, a method is proposed for increasing the precision obtained in cold deformation on the basis of plane finishing. Modeling results are presented. The stress–strain state of the workpiece in upsetting is determined.
376-380
Network Traffic Monitoring on the Basis of Sequential and Associative–Sequential Search Principles
摘要
Network traffic monitoring on the basis of sequential and associative–sequential principles of current- information search is assessed in terms of efficiency. Associative–sequential search for information in network traffic permits increased productivity and faster decision making during searches in large information spaces.
381-383
Preproduction Using Automated Process Design
摘要
A new approach to the computer-assisted design (CAD) of machining processes is outlined. Mathematical apparatus for the solution of standard problems is proposed, and the source code for its implementation is developed. The source code for an experimental CAD system is developed. An interactive graphical input is used for dimensional data.
384-386
Automated Shaping of Punches for Deep Extrusion with Thinning
摘要
A mathematical procedure for finding the contact points of shaping arcs at the end of a punch is considered. Profiling of the conical upper section of a punch is discussed. A golden-section algorithm is proposed for determining an angle whose value cannot be determined analytically from the initial data.
387-389
Automated Mapping of a Plane Curvilinear Contour by a Smooth Set of Arcs in Rotary and Deep Extrusion
摘要
The use of smooth continuous approximating curves consisting of arcs of circles to solve production problems is considered. A relatively simple and efficient recurrent algorithm is developed for use with Kompas-3D, MS Excel, and other software. The algorithm is based on the property of the bisector of a triangle. An analytical form of the approximating curve is determined. A real-time graphic interactive interface in Kompas-3D software is derived. Some irregular mapping situations are described. Practical results are outlined.
390-393
Automated Industrial Design Based on Artificial Intelligence
摘要
The development of a CAD system by an object-oriented approach is considered. The configuration of the integrated environment is described. The organization of a uniform information space is discussed, and the organization of interactions between the CAD components is outlined.
394-398
Control Signals of a Predictive Industrial PID Controller
摘要
To expand the functional capabilities of industrial controllers for systems subject to external disturbances, developments to date are reviewed, and an approach permitting the generation of control signals on the basis of predictions is proposed and tested. The benefits of this approach are assessed. It is best used for large industrial equipment and systems in manufacturing and the oil and gas industry.
399-402
Simulation of a Flexible Production System
摘要
The development of computer models for a flexible production system is considered, as a step toward automated design. The formulation of modeling algorithms for flexible production systems at the level of technological operations is outlined. The corresponding software for a computerized modeling system is described.
403-407
Assessing the Temperature Error in Operational Machine Tools
摘要
In the proposed experimental assessment of the temperature error in operational machine tools, the workpiece is monitored by means of a measuring probe as it is machined. Experiments show that the temperature error in the machine tool may be compensated by specified thermal displacements of the machine-tool components before machining begins.
408-410
Automated Calculation of Bulk-Stamping Matrices for Circular Blanks
摘要
The bulk stamping of circular blanks is considered. There is a clear need for automatic stamping. The input and output data for calculating the working part of the bulk-stamping matrix are analyzed. Software for automated calculation of bulk-stamping matrices is developed. The program code and a possible interface for the calculation of matrix parameters and construction of 3D models by means of the Object Pascal language are presented.
411-414
Identification of the Basic Parameters of an Aircraft Wing
摘要
A method of identifying the basic parameters of airplane components is proposed on the basis of correlation and factorial analysis, with the subsequent derivation of polynomials by the least-squares method and by Brandon’s method. A multiparametric approach to design analysis and synthesis is formulated on the basis of a formalized process. This approach permits clear decisions for individual aircraft components at the preliminary design stage, as demonstrated here for the example of a wing.
415-418