卷 37, 编号 10 (2017)

A new control system is proposed for Stirling engines. The system is based on a sealed external system for hydrogen sorption and desorption, with a thermoelectric heating and cooling system. It is intended to improve the operational reliability and the safety of the maintenance crew; to reduce the operational noise level; and to reduce the size and mass of the motor and simplify its design.

On the basis of experimental data, a criterion is derived for determining the localization time of the deformation in plane samples under tension at high temperature. The time of uniform deformation of the sample is determined.

The wear of the polytetrafluoroethylene–steel frictional pair is investigated. The dependence of the frictional coefficient and the wear on the contact temperature is determined. The temperature range of adhesive wear is established for polytetrafluoroethylene.

The application of hard alloy coatings by means of electrical contact explosions is considered. This method may be used to strengthen heat-treated multicutter tools.

An analytical model is obtained for calculating the working life of a cutting tool with a plasmamodified surface layer. It permits calculation of the conditions ensuring increased wear resistance of the tool and hence increased reliability in manufacturing on numerically controlled machine tools.

Many organizations and automated data-processing systems are involved in analysis of the logistical support (ALS) of high-tech equipment. Therefore, the initial data and the results of analysis must be presented in standardized form. That calls for an integrated informational model describing all the relevant data elements, their attributes, and their relationships. In ALS, the instruments that monitor the operation of the high-tech equipment form an important component of the information system.

The effectiveness of structural–parametric synthesis of metal-cutting systems is assessed in comparison with the traditional design approach.

The use of copper-coated aluminum electrodes in the electrical discharge machining of 38X2H2MA steel is assessed. Such electrodes prove effective. The use of coated electrodes improves the economics of electrical discharge machining by permitting the use of cheaper materials in the electrode core.

The cutting time and speed in the abrasive lapping of zirconia ceramics are investigated. Their influence on the productivity and final surface roughness is considered. The optimal cutting time and speed are determined

By using polymer composites in auto parts, the vehicle mass may be considerably reduced, with improvement in the dynamic properties and load capacity of the vehicle and also in its fuel consumption and tailpipe emissions. In the present work, recommendations are made for improving the performance of glassfilled polyurethane materials produced by fiber composite spraying. To that end, the thermal stability, impact strength, high-temperature strength, and Shore D hardness are determined in accordance with Technical Specifications TU 2292-010-14682925–2014. The sound absorption and UV resistance of the composites are also determined.