SU301184A1 - DEVICE FOR THE EXCITATION OF TORQUE SINUSOIDAL OSCILLATIONS - Google Patents

Description

FIELD OF VIBRATION ENGINEERING .J

Devices are known for driving torsional sinusoidal oscillations in a system equipped with a rotating shaft, comprising an electric motor connected to one of the shaft ends, and a vibration exciter, the casing of which is mechanically connected to its other end and made in the form of a gyroscope with rotors embedded into one another. perpendicular axes, the inner rotor has an individual drive, and the outer rotor is kinematically connected with a moving frame of the vibration exciter, equipped with a self-contained electric drive with the drive. However, such devices have insufficient accuracy.

The proposed device is characterized in that in it the vibration exciter is equipped with an identical main additional gyroscope, the gyroscopes are symmetrically located relative to the axis of the shaft. At the same time, their outer rotors lie in the same plane, perpendicular to the shaft axis, parallel to each other and kinematically connected with the moving frame, and the axes of the inner rotors rotating at equal and opposite angular velocities are set at an equal angle to the shaft axis.

FIG. 1 is a schematic diagram of the device described; in fig. 2 - splitting the gyroscopic moment into two components.

The scheme includes the system under test /, the ends of the shaft 2 of which are connected to the electric motor 3 directly and to the housing 4 of the vibration exciter 5, which contains two identical astatic two-stage gyros b and 7 symmetrically located relative to the axis of the shaft 2 of the system under test, and a movable frame 8 connected to electric motor 9.

Each of the gyroscopes contains the outer rotor 10 and the inner rotor 11 embedded in one another, with the axes of rotation of the rotors 10 and // mutually perpendicular, and their intersection point corresponds to the center of mass of the body system of the rotor 10 plus rotor n.

The rotors 10, statically and dynamically balanced, receive rotation from the frame 8 by means of two bevel gears / 2 and a system of spur gears 13. The rotors // are also statically and dynamically balanced, and they also have independent drives (not shown) and their axes are symmetrical.

The rotors of 10 gyros b and 7 using gears 13. This system provides rotation of rotors 10 with equal, but opposite to etched angular velocities. The rotors 11 rotate in the same way, and their axes at any time during rotation of the rotors 10 are non-parallel with each other and are equal to the angles equal to the magnitude of the system Y axis of the rotating shaft 2. This orientation of the rotors 11 is provided during assembly by pre-rotation of the rotors 10 so that the rotor axes // are equal in magnitude with the Y axis. With the continuous rotation of the rotors, the projections of the vectors of gyroscopic moments on the axis Y, which coincides with the axis of the shaft 2, change according to a harmonic law. These moments are transmitted to the rotors 10 and further, summing up, through the housing 4 of the vibration exciter 5, the rotating shaft 2 of the system. Due to the presence of two gyroscopes b and 7 and the synchronization of the rotors 10, the pairs of gyroscopic moments created by the gyros in the plane containing the shaft 2 are balanced, and in the plane perpendicular to the axis of the shaft 2 are always added.

Thus, the shaft 2 is acted on by a pair, the moment vector 2Mj / of which is directed along the axis of the shaft and varies according to a harmonic law. Therefore, shaft 2 performs torsional sinusoidal oscillations, and longitudinal bending oscillations are absent.

Subject invention

A device for exciting torsional sinusoidal oscillations in a system equipped with a rotating shaft, containing an electric motor connected to one of the shaft ends, and an exciter, the casing of which is mechanically connected to its other end and made in the form of a gyroscope with rotors built in one another axles, the inner rotor has an individual drive, and the outer rotor is kinematically connected with a moving frame of the vibration exciter, equipped with a self-contained electric drive, similar to the fact that, in order to increase

accuracy, the exciter is equipped with an identical main additional gyroscope, which are symmetrically located with respect to the shaft axis, while their outer rotors lie in the same plane, perpendicular to the shaft axis, parallel to each other and kinematically connected to the moving frame, and the axes of the inner rotors rotating with equal and oppositely directed angular velocities, set at the same angle to the shaft axis.