Journal of Machinery Manufacture and Reliability最新文献

This article considers the results of experimental deformations of rubber parts of a rubberized-cord toroidal enclosure under compaction by outer and inner steel flanges of an elastic coupling joint. The results of experimenting with one and two monolayers of bearing polyamide cord are presented as graphs of dependences of the frictional coefficient, frictional torque, and slip torque on the applied radial force and compressional deformation of the enclosure by metal flanges. It is shown that the elastic part with two cord monolayers resists the highest load without sliding on exposure to the operating torque with the nominal compressional deformation of the bead parts of the enclosure. The experiments have shown that, in this case, the fatigue cracking on the side surfaces of the rubber part of a coupling joint is less intensive.

The results of tests conducted for different batches of TiNi-based shape memory alloys with various Ti, Ni, Fe, and Co contents are provided.

Among the most rapidly developing areas of modern medicine, minimally invasive surgery occupies a prominent position. One of the modern means of performing operations is the Soloassist® endoscope manipulation system. It is a robotic endoscope holder controlled by a minijoystick attached to the main instrument or by voice commands. The mechanical part of the Soloassist® system has the form of an open kinematic chain. The position problem is to find the rotation angles of the holder given the position of the end point of the tool.

In this paper, the concept of conjugated surfaces is used to reproduce complex spatial surfaces with a tool that also has a complex cutting surface. Universal torus cutting surfaces have been analyzed, allowing us to reproduce convex and concave surfaces with variable radii of curvature. The choice of the position of the cutting edge on the cutting surface is considered in such a way that a universal tool can reproduce complex surfaces with variable radii of curvature.

An overview of the application of artificial intelligence and process control models in mechanical engineering is presented. A number of key aspects are considered, including increasing productivity, product quality, and predicting equipment failures, as well as the prospects and problems of using artificial intelligence in this area. Integration issues and security concerns related to the implementation of artificial intelligence are discussed. Particular attention is paid to the problems of development and application of models of technological process control to improve production efficiency. The role of artificial intelligence in this process is emphasized, and its potential for automation and intellectualization of management is noted. Several important directions for further research are proposed, including the development of more complex and adaptive models, exploration of the possibilities of integrating machine learning methods, conducting experiments in real production conditions, and developing standards for evaluating the effectiveness of control models.

Alongside the maneuvering of spacecraft in the atmosphere, a high intensity of dynamic changes in flight situations also occurs during the active phases of motion of the spacecraft when it is being placed into orbit as an artificial satellite of a planet. Corrective control programs have been developed in the form of functional relationships between control inputs and deviations of trajectory parameters from their nominal values. The use of these programs, combined with calculated analytical dependences, enables the implementation of flight trajectories that are close to optimal disturbed paths, including under conditions of parameter deviations during the atmospheric entry of the spacecraft.

A method for calculating press fits of multilayer high-speed rotors was proposed, implemented in software, and tested. The calculations are based on analytical dependences and implemented in a linear formulation. Using the proposed approach allows for a significant reduction in the time required to assess the performance of a design at the draft design stage.

This article presents the design of a power device made of the TiNi-based shape memory alloy; the application of a shape memory alloy enhances the capabilities of power devices.

The intensive development of agricultural machine engineering leads to a continual increase in demand for information about the technical, performance, and operational features of designed machinery. To improve the operational efficiency and productivity of the engineering and technical services involved in creating and running these machines and to shorten the design, follow up, and testing periods, as well as improve these characteristics, it is necessary to create data retrieval systems of consumed data. These systems must be created as automated databases with a standard database control system with flexible formats for output documents covering a large range of indicators and properties of tested machines and accumulated information. The databases must be formed on logical structures. In other words, the data must be logically organized as a set of types of data records and relations among them. This article covers several studies conducted to create and develop a data retrieval system of this kind, that is, an automated database of mobile power utilities used in agribusiness.

This study is dedicated to determining the propagation parameters of radio signals both inside and outside the pipeline space at carrier frequencies of 2.4 and 5 GHz. The most efficient equipment for transmitting and receiving signals within the pipeline space was identified as “Mikrotik.” The minimum signal level at the frequency of 2.4 GHz was found to be –18 dBm, and at 5 GHz, –26 dBm in a pipeline 40 m long. The dependences for determining the signal level inside the pipeline space based on the distance of the in-pipe robotic complex were presented, taking into account correlation coefficients of the radio signal for the in-pipe environment. During data transmission and reception, the signal level did not drop below –68 dBm or –61 dBm at 2.4 GHz over distances up to 2100 m. For data transmission and reception at 5 GHz, the signal level did not fall below –80 and –74 dBm.