CHARACTERISTICS OF VIBROACTIVITY OF DRUM-TYPE MACHINES WITH A VERTICAL AXIS OF ROTATION

Abstract

A mathematical model of a drum-type machine with a vertical rotor in the form of equations of oscillations of a multiconnected tank-platform system on elastic suspensions was created and its vibroactivity at operating speeds was investigated on the example of a vertical washing machine. The influence of design parameters of the system on the amount of system vibrations is analyzed and recommendations for the layout and improvement of the machine design are made.

As a result of the research, the basic requirements for the layout of vertical rotary machines of the drum type were obtained theoretically and experimentally confirmed: the center of mass of the platform must lie on the axis of rotation of the drum; the axis of rotation of the drum should be the main central axis of inertia of the platform; the center of mass of the platform must coincide with the center of mass of the loading drum; the center of rigidity of the system of elastic supports must coincide with the center of gravity of the platform, and the main axes of rigidity with the main central axes of inertia of the platform; the main axes of the constant viscous friction must coincide with the main central axes of the inertia of the platform.

Studies of the created mathematical model of a drum-type machine with a vertical rotor by simulation methods have shown that the improvement of the design of the experimental setup leads to a decrease in its vibroactivity. The obtained theoretical results were tested on a specially created and improved experimental setup. The results showed a decrease in the vibration level of the machine at resonance and a satisfactory coincidence of experimental and numerical simulation results.