Endurance tests of single machines production

Abstract

The paper proposes to consider the reliability of machines in terms of mass and individual production. The proposed approach makes it possible to assess the impact of various failures of machine parts on the reliability of single-purpose vehicles. Failures occurring as a result of fatigue wear are considered, but they are of a sudden nature of failure. A condition is defined to prevent such failures, from which the assigned resource to the limit state of the part must be less than the resource of each particular part that may be susceptible to sudden failure. This condition can be applied both for serial production machines and for single-source machines. An algorithm for determining sample and aggregate parameters and an algorithm for resource testing for reliability for single-source machines are proposed. The key stage for the development of the algorithm is the resource testing of machines, the carrying out of which makes it possible to objectively assess the reliability of the loaded parts. To reduce the period for obtaining test results, it is necessary to carry out accelerated resource tests of machines, which can be achieved by intensive operation of machines with short stops for inspection and maintenance. Failures resulting from tests constitute a sample that, after being processed by theoretical laws, allows the determination of the smallest values. Studies have shown that even with the estimation of sample values, the possibility of premature failure continues. In this regard, the paper proposes to use the aggregate parameters to estimate the minimum values. The use of such an algorithm will make it possible to exclude the possibility of the onset of premature failures by determining the period of operation of vehicles during which the failure-free operation of cars is guaranteed.

Mechanical coating formed under conditions of vibration exposure

“…The pores and dislocations that occur are the result of vibrowave system. Shallow deepenings and longitudinal uniform risks of various shapes and sizes are visible on the test surface, which is a consequence of direct and oblique strokes [9,10].…”

“…The broad technological capabilities of vibrowave technological systems are the most effective means for obtaining high-quality, from the point of view of ensuring operational properties, coatings for various functional purposes on the surface [1][2][3][4][5][6][7][8][9][10][11][12]. Feature of the coating method considered in the article is that it is formed on the metal surface as a result of shock-pulse interaction of free-moving indenters in a closed volume under the influence of low-frequency oscillations.…”

Optimization of transport routes based on environmental indicators

“…The decision to install a smart traffic light system should be based on an analysis of the traffic situation at the intersection. For the analysis of the transport situation, such approaches as field observations are widely used, which make it possible to determine the structure and number of vehicles, software systems and technical means [15][16][17][18][19][20][21][22].…”

Theoretical foundations of modeling the process of transport vehicles steel ropes structural defects formation

“…Problem setting. In the study of the resource and durability of steel ropes operation, despite high resource of steel ropes declared by the manufacturer (15 -20 years of exploitation), the authors noted that after 5 -6 years dangerous factors appear at the sites of splicing (breaks, external wear of wires, rope diameter reduction as a result of core damage, loss of internal section, formation of "waviness"), which is the basis for unscheduled rope repair with replacement of the defective area and leads to significant material costs [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. These hazardous factors indicate a violation of the steel rope physicomechanical characteristics at the splicing site and lead to its premature wear.…”