The simplest, most reliable and sufficiently accurate method of dosing bulk products is batch dosing by volume using measuring containers. The article considers a mathematical model of a volumetric dispenser. The combination of several methods of regulating the supply of bulk materials during batch dosing is ensured by building an accurate model of the drum dispenser.

Keywords: mathematical model of a drum dispenser, dosing process, friction, dynamic coefficient of friction, static coefficient of friction, bulk material

The constructions of directional microphones of the "linear" type and the test procedure are described. On a controlled lane of the highway, full-scale studies of microphones produced by the authors were carried out. Thus, the relative error in the measurement of microphones No. 1 and 2 was found, which was 12.1 and 13%, respectively. The minimum error is detected with a microphone of the "linear" type No. 1, whose slots are located on the sides on four sides

Keywords: transport stream, transport noise, passive acoustic detector, directional microphone

We describe the design of a directional microphone and a methodology for conducting the tests. In a controlled motion lane highway conducted field observations made by the authors microphone. As a result of the simulation is determined relative measurement error. It is shown that in order to reduce relative error detector transport recommended in 30-100 m behind the traffic lights, since the start of the vehicle the sound coming from the car, increases. Within the measurement error of 12%, a passive acoustic detection of transport, can be applied in the total intensity on the stretch of road that does not exceed 400 vehicles / h.

Keywords: transport stream, transport noise, passive acoustic detector, directional microphone

The investigation and analysis of noise characteristics of the traffic flow via a directional microphone. The principle of operation of directional microphones and test procedures. Full-scale research made microphone-controlled lane highway. When approaching the vehicle to the maximum level of the microphone signal is necessary at the time of finding the vehicle in front of a microphone. Investigations at the location detection hole up from the road surface to the left (toward the oncoming lane controlled by car) and right (after moving band controlled by car). Location detecting holes toward the oncoming lane controlled by car is the best, as it allows to ensure minimum impact on the accuracy of counting cars traveling on the adjacent oncoming lane.

Keywords: noise characteristics, transport stream, passive acoustic detector, directional microphone