Vol 37, No 4 (2017)

The equipment for dynamic tests of sliding thrust bearings is considered. The test data are analyzed for a thrust bearing with motionless pads in a centrifugal compressor with a semiclosed impeller in pumping mode.

The basic principles of accelerated endurance tests of K-H-V planetary gears at low speed are considered.

A drive system that reduces the drag on a vehicle traveling over deep snow cover is described.

Dampers and shock absorbers consisting of vertical concentric elastic shells are considered. The external and internal shells are made of hard rubber, while the middle shell is made of soft rubber. Independent action of the shells permits optimal loading and energy-efficient operation of the device.

The reliability of centrifugal–rotational finishing by steel shot is assessed. This process ensures effective and stable quality of the machined part.

The development of an information model of digital manufacturing is considered. The goal of the model is maximum integration of the management systems for enterprise resources (ERP) and the product life cycle (PLM) and for operational management (MES), by expanded application of the provisions of the ISA-95 standard. A methodology is proposed for creating digital doubles of real production processes by the development of the Herbarium integrated engineering software platform (Foundation for Advanced Studies).

Possible manufacturing and assembly errors in a metal-cutting machine with parallel kinematic structure that affect its kinematic model are analyzed. On the basis of the manufacturing tolerances for the metal-cutting machine, the equations of the direct and inverse kinematic transformations are refined. An algorithm is derived for simulating the influence of geometric errors on the positioning precision of the actuator in the metal-cutting machine.

The stress state of replaceable hard-alloy inserts in composite bits is studied. The influence of the inserts’ design parameters on the stress and strain in cutting is analyzed. Inserts of increased strength and bits of improved performance are developed.

A slow-neutron detector based on thin CVD diamond film is discussed. A deep graphitized layer in the diamond film acts as one of the electrodes in the detector. The detector demonstrates low sensitivity to γ radiation, at the background level. The detector is tested with a laboratory neutron source based on the isotope ²⁵²Cf in a moderator. Slow neutrons are detected by means of the boron isotope ¹⁰В and lithium isotope ⁶Li. In both cases, slow neutrons are recorded with about 3% efficiency. The efficiency of slow-neutron recording is also assessed theoretically.

The effective application of Unigraphics NX software in preparations for production is discussed. Optional approaches to the design of workpieces and attachments and the development of operations in numerically controlled machine tools on the basis of Unigraphics NX software are outlined.

Ambient noise harms the human organism: it produces high levels of the stress hormones, disrupts the operation of the nervous system, provokes cardiovascular damage, and impairs hearing. In the creation of new noise-reducing materials, the goal is to increase porosity without loss of structural strength. With greater porosity and reduced thickness, acoustic insulation will be lighter, which is better for use in automobiles. In addition, the dynamic characteristics are improved, and vehicle assembly is simplified.