Vibro engine movement is viewed in a horizontal or inclined plane. The mathematical model includes a complete body of motion with a sliding or rotating engine inside (with extra mass). In general, the system has a minimum of four degrees of freedom (three degrees of freedom for the frame, one for relative motion of the internal mass). If, in addition to the vibro engine (robot), the towed object is added, then there may even be five to seven degrees of freedom. In the process of generating system motion, additional micro-compression with the foundation takes place. Computer technology was used in the study of the dynamics of such a complex object. It has been found that the main parameter of the drag effect is the slip friction coefficient, which should be chosen as maximally possible or as necessary to use sharps. The results of modeling are presented. For example, it is noted that the average speed can be up to 0.5 m•s -1 . The ability to pull a load on a robot has been analyzed. It is understood that in this case the driving speed is reduced. The system can be used for moving robotic objects.

The paper provides simulation results for SUP (Stand Up Paddle) board appendage resistance. Additional propulsion is added to the SUP board. It is equipped with a waterjet. The waterjet is attached to the board rudder. This increases the drag coefficient for rudder five times. To reduce the drag variable, design options for the waterjet duct were proposed. The simulation tests were performed using SolidWorks Flow software using two types of simulations, namely, the pressure on the body and the flow around the body. The objective was to streamline the bluff duct of the waterjet and thus to create the appendage design with minimum drag force from fluid flow and possibly greater Inlet Velocity Ratio. Calculations showed that rounding-off the edges of waterjet duct resulted in 35 % of drag coefficient reduction, while further streamlining reduced it by additional 10 %.

Fluid (water) flow translation motion conveyor (transporter) is being reviewed. In this device the actuator blades move in the plane axis parallel cycloidal motion, but the fluid flows away perpendicular to the rotation axis in translation direction. For this purpose the blade two component movement is synthesized by kinematics of the gear box: the first rotation takes place around the central axis of each blade, while the other rotation moves around this centre around the central axis of the transporter. The movement is designed in such a way that the central axis rotates twice as fast as the blades around its axles. The kinematics and dynamics of the transporter movement are analyzed, taking into account the characteristics of the drive motor and the blade interaction forces with fluid. The results of the analysis are shown in the graphs obtained by computer modelling. The possibility of creating a multi-element conveyor is being reviewed on the basis of one rotational element. In this case, it is possible to increase the efficiency of the system in such a way that the individual small conveyors in pairs operate in counter phase (rotates opposite). For transporter experimental investigations a special system is made inside the water tank. The system includes a rotating beam with a possibility to stick the devise in the end of this beam. Measurement sensors and the engine power system cable are connected to the control system via sliding contacts. A direct current electric motor is created in the conveyor drive. It allows to change the blade drive rotation number of a wide range. The design used in the work may also be used for other purposes, for example, for generation of energy from fluid flow. In this case, like before, all formulas can be used as calculation in relative interaction.

The paper provides simulation results for water flow ratio in the waterjet attached to the SUP (Stand Up Paddle) board fin. The goal of the project is to attach the waterjet propulsion to the SUP board with maximum efficiency. To do it, the model of the person driving the board and waterjet was created in SolidWorks. In this paper the water flow rate depending on different nozzle and duct design was analysed. There are two conflicting requirements for the propulsion duct design. On the one hand, the duct must protect the propulsor from stones and water plants, because SUP boards travel on rivers, sometimes very close to stones. On the other hand, the efficiency of the waterjet requires maximum water flow rate available for a possibly greater Inlet Velocity Ratio. Finally, there should be enough place for the battery pack, which drives the waterjet, but it creates an additional barrier for the water flow. The flow rate at the outlet depends on the nozzle and is also important for the propulsor efficiency. Variable design options for the waterjet duct were proposed and tested in SolidWorks Flow simulation environment. At the beginning of the project there was an intention to create different ducts via 3D printing. The simulation showed that modification of the inlet duct results in minor (only 0.01%) increase of the flow rate, if the front panel remains closed due to the oblique stagnation point flow phenomenon, and 3D printing resources should not be wasted on this test.

The aim of the paper is to analyze and optimize the operational safety and efficiency of wind energy conversion equipment. A wind energy conversion device equipped with one oscillating flat blade has been developed and studied. In this device, lateral surface of the blade is firmly attached to the crank, which is kinematically connected with the generator's slider moving inside the electric coil. As a result, electrical energy is produced in the linear generator. The considered electromechanical device is described by the second order differential equation. In this equation, the interaction of wind flow and relative motion of the blade is described by the approximate relationships of classical mechanics. Operation of the system due to the action of air flow is simulated with computer program Mathcad. Possibilities to obtain energy with generators of different characteristics, the operation of which is regulated by mechatronic control, have been studied. The effect of a constant wind flow with a constant speed and also with a harmonic or poly harmonic component is considered. Partial parametric optimization of the electromechanical system has been performed. Graphs for the change of plate phase coordinates, as well as for the change of the obtained power are presented. The results obtained in the paper can be used in the study of similar fluid flow interactions at damping or energy extraction.