The article discusses the issues of 3D-printing and reinforcement of concrete mix with an automated reinforcement integration system, analyzes the effect of the mixture on the dynamics of the construction printer. During the work of the construction 3 D-printer, data was obtained from the accelerometer in the form of graphs of the oscillation frequency of the construction printer, which characterize the main operating parameters. The valve feed was arranged in such a way as to ensure application with virtually no stress. A roller feeder for the rear of the nozzle has been developed for this purpose. Experimental curves of force dependence on displacement for 40 × 40 mm samples with reinforcement reinforcement are presented.
Keywords: construction 3D printer, concrete mix, vibration pattern, accelerometer, reinforcement integration
The article presents the results of a study of the stepper motor control system of a road printer. The use of a stepper motor imposes additional requirements on the road printer in terms of operating parameters control. The main requirement for the stepper motor of the road printer is to ensure the rotation of the rotor, at a given angle, which depends on the control mode. The description of the road printer is given. The dependencies of the stepper motor as a control object are given. Investigated for the stability of the Nyquist system. A simulation model of the stepper motor control system of a road printer has been developed and simulation results are presented.
Keywords: road printer, stepper motor, mathematical model, transfer function, modeling, controller
The results of an experimental study of the process of laying asphalt mix with automation components of the technology of non-destructive continuous compaction control in the field of road construction are presented. The research was carried out in order to obtain real data for the task of creating a quality control system for compacting road materials in real time. During the study, the operating parameters of the paver were measured (velocity of movement, the frequency of impacts of the tamper, the frequency of vibration of the plate), the temperature of the compacted asphalt mixture, the thickness of the pavement layer, the vertical acceleration of the vibrating plate. The study used asphalt concrete mix type A grade I according to GOST 9128-2013. The operating parameters varied: the frequency of impacts of the tamper, the frequency of vibration of the plate. The acceleration of the vibrating plate was determined using a digital accelerometer with wireless signal transmission via Bluetooth to a smartphone with the Android operating system. The paper obtained the values of dimensionless complexes, the index of compaction of asphalt concrete mixture - the peak factor characterizing the change in the quality of compaction of asphalt concrete mixture.
Keywords: asphalt mix, non-destructive technologies, continuous compaction control, compaction index, acceleration of vibrating plate