The object of the study is the method of evaluating the durability of the cutting tool, which evaluates the rationality of the periodicity of changing the cutting tool during turning on the basis of the indicator of vibration. To form a signal for the analysis the registration of vibroacoustic vibrations during the processing of parts by the device for measuring noise and vibration VShV-003-M2 takes place. To check the transfer function used in the methodology the construction of the model of dynamic system of the lathe is made. The construction of autocorrelation function and amplitude-frequency response of the dynamic system is used to estimate the durability according to the oscillation index. A series of tests to estimate tool life under recommended cutting modes are made, and the results are corrected according to the obtained results. Record of files for the analysis was made in a wave-file format. Analysis of the results made it possible to make recommendations for tool change intervals for better control of tool and labor rationing. Knowledge of the durability of cutting tools is necessary for timely replacement of cutting inserts and control of losses in production.

Keywords: vibration index, catastrophic wear, tool, cutter, tool life, condition monitoring, vibration, lathe, sensor

The article describes the study of the behavior of the reaction vector in the contact spot of the wheel with the support base when the values of the angle of rotation of the driving wheels vary. To find the dependence of the values, a MATLAB Simulink model was created with software blocks that allow determining the behavior of the reaction vector in the contact spot of the wheel with the support base when the values of the angle of rotation of the driving wheels vary.

Keywords: controllability, mathematical model, wheeled vehicle simulation, wheel tire, wheel rotation angle, MATLAB Simulink

This paper presents the results of a study of the speed and acceleration time of a wheeled vehicle with a 4x2 manual transmission with a rear driving axle. A mathematical model of this wheeled vehicle is given. For this purpose, a design scheme of the differential transmission of a wheeled vehicle with a rear driving axle was presented, and a system of differential equations of motion of the car was also given. Simulation modeling is carried out using the MATLAB Simulink environment, which allows conducting research on the developed system based on a given mathematical model.

Keywords: wheeled vehicle, 4x2 manual transmission, rear drive axle, MATLAB Simulink, mathematical model, simulation.

The object of the research is the method of cutting tool wear control that provides evaluation of the periodicity of cutting tool replacement on the basis of vibration signals. Noise and vibration meter VShV-003-M2 is used for registration of vibration level in the process of parts processing. A procedure of determining the index of catastrophic cutting tool wear according to the vibration index with the use of the autocorrelation function and the amplitude-frequency characteristics of the dynamic system is developed. Measurements of vibration readings of a batch of parts in wave-file format were made, by processing the readings an array of data - vibration indicators, allowing to estimate the process of the cutter wear development during the machining process was obtained. Providing control of catastrophic wear of cutting tools is necessary for timely replacement of cutting inserts.

Keywords: vibration index, catastrophic wear, tool, condition monitoring, vibration, turning machine, sensor