Trudy NGTU im. R.E. Alekseeva

The article presents a developed software for solving the problems of production resources distribution in the automation of the manufacturing high-tech products for enterprises of the mechanical engineering division of the State Corporation Rosatom. An NP-hard production planning problem is considered. Heuristic procedures with different work scenarios depending on the specifics of the problem are used to solve it. The decision algorithms implemented in the SMART-resource software are based on the author's frontal algorithms. It is possible to use various scenarios to solve the problem due to the information obtained taking into account the implemented feedbacks. A mathematical model of the problem of production resources distribution is presented, within the framework of which the task of production resources distribution according to the criterion of minimizing deviations from the specified directive deadlines for the production of planned products is set. Its NP-hardness is shown. Algorithms for its solution are given. A software tool has been developed and implemented that allows regression testing and tuning of internal parameters of frontal algorithms with feedback for target tasks when solving NP-hard production planning problems using the SMART-resource production planning system.

The article discusses image morphological analysis methods for detecting defects in coatings. The application of morphological operations such as erosion, dilation, closing and gradient effectively highlights object boundaries in images. An approach to automated coating image analysis is proposed. This approach allows determining the defect coordinates, area, perimeter, and eccentricity. The results demonstrate the high efficiency of morphological processing methods in enhancing the accuracy and completeness of surface structure analysis. A table documenting defect characteristics has been developed, serving as a foundation for further classification and quality assessment of coatings. The proposed methods improve defect detection accuracy and have potential applications in industrial and scientific research.

The article presents the results of test bench with a liquid metal coolant with four circulation circuits connected in the upper chamber: one heat source in the form of a seven-rod fuel assembly simulator and four heat exchangers removing heat from each circuit. Data on the mode of natural circulation of lead-bismuth melt in two- and four-loop circulation systems, as well as data on changes in the natural circulation mode when the heat transfer in one of the circulation loops is disrupted are obtained.

The paper analyzes the loss of stability for front- and rear-wheel drive vehicles. Linear models are created and frequency response are studied. The conditions for the occurrence of resonances for each of the two systems are formulated. It has been proven that there is no risk of loss of stability for a rear-wheel drive vehicle, and a condition has been formulated under which loss of stability is possible for a front-wheel drive vehicle.

The influence of the S-shaped law of torque assignment in the control of an electromechanical power transmission on the dynamic load of a mechanical transmission and on the energy efficiency of movement is studied. The S-shaped law of torque assignment showed the possibility of excluding the excitation of vibrations when changing the driving mode and the direction of application of the load in the mechanical transmission of the power transmission. A high value of the regenerative torque when releasing the pedal and moving in braking mode reduces the efficiency of movement, increasing the specific energy consumption. The application of the S-shaped law of torque assignment is possible for the implementation of motion control algorithms and software implementation.

The article studies methods for stiffness calculation of wheeled vehicle suspension systems spring elements. The KAMAZ Innovation Center has developed a new method for antiroll-bar stiffness calculation is developed, taking into account its geometric shape. This method allows to achieve a high accuracy of calculation with an error within 5 %. The design scheme of the antiroll-bar is presented. The comparative assessment is made on the basis of the results of a series of anti-roll bar models calculations using a numerical method in a finite element analysis program.

The proposed method allows to clarify the calculations of vehicle dynamics by obtaining the stiffness value of the transverse stability stabilizer close to the real one for correct determination of the roll angle of the wheeled vehicle's sprung mass, which is an important criterion of vehicle motion safety.