Technology, energy, agriculture transport AIC

Oleh IVANOV – Candidate of Technical Sciences, Associate Professor of the Department of Construction and Vo cational Education,Poltava State Agrarian University,1/3 Skovorody Street, Poltava, 36003, Ukraine, e-mail: oleg.ivanov@pdau.edu.ua, https://orcid.org/0000-0002-1761-9913).

Taras LAPENKO – Candidate of Technical Sciences, Associate, Professor of the Department of Agroengineering and Automotive Transport,Poltava State Agrarian University,1/3 Skovorody Street, Poltava, 36003, Ukraine, e-mail: taras.lapenko@pdau.edu.ua https://orcid.org/0000-0001-8055-6698). 

Oleksandr DIDENKO – Postgraduate Student, Poltava State Agrarian University (1/3 Skovorody Street, Poltava, 36003, Ukraine E-mail: oleksandr.didenko@pdau.edu.ua, https://orcid.org/0009-0008-5479-1123).

This paper investigates the thermal behavior of intermittent diamond grinding under conditions of automated control of the tool–workpiece contact structure and energy input intensity. The grinding process is modeled as a closed nonlinear dynamic system with logical switching, in which contact intermittency is formed in real time based on the thermal state of the grinding zone and adaptive correction of the normal grinding force.
Numerical simulations show that in the absence of control the contact-zone temperature increases monotonically and, for the adopted parameters, approaches a steady-state value of approximately 76 °C, exceeding acceptable thermal limits. Implementation of a single-channel temperature-based control results in the formation of a stable thermal limit cycle between 45 °C and 58 °C, with a temperature oscillation amplitude of 12–13 °C and an average cycle period of 4–5 s. In this mode, the mean process temperature is reduced by approximately 10–12% compared to uncontrolled grinding; however, the temperature remains above 90% of the upper admissible limit for 20–25% of the total processing time.
The proposed dual-channel control strategy, combining temperature-based contact intermittency with adaptive adjustment of the grinding force, leads to a pronounced modification of the thermal dynamics. Peak temperatures are reduced by 3–4 °C relative to the single-channel mode, the thermal cycle amplitude decreases to 6–8 °C, and the mean temperature is further reduced by 5–8%. The fraction of time during which the temperature remains close to the upper allowable limit is more than halved and does not exceed 8–10%.
Quantitative analysis of the contact time structure reveals that the contact duty ratio decreases from 0.60–0.65 in the temperature-controlled mode to 0.3–0.4 under dual-channel control, while the switching frequency is reduced from 0.35–0.40 Hz to 0.25–0.30 Hz. This indicates the formation of a less intensive and more uniformly distributed energy input over time. The results demonstrate that adaptive contact intermittency, treated as an active control variable rather than a fixed kinematic feature, provides an effective means of reducing thermal loading and improving thermal stability in intermittent diamond grinding without the use of external cooling.

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