Rotor variable-mass frequency-modulation dynamic vibration absorber of rotating machinery

Abstract

The invention relates to a rotor variable-mass frequency-modulation dynamic vibration absorber of rotating machinery. The vibration absorber is formed by a connection transmission mechanism, a mass regulating mechanism and a control system. A rotating machinery rotor produces vibration in the work. The rotor variable-mass frequency-modulation dynamic vibration absorber is installed at the proper position of the rotor. The connection transmission mechanism installed on the rotor transmits vibration energy produced by the rotor to the mass regulating mechanism; the mass regulating mechanism keeps consistent in frequency with a rotor main system under the adjustment of the control system to cause resonance; an annular mass plate produces a dynamic response and counteracts the dynamic response on the rotor main system, so that the effects of offsetting and suppressing rotor vibration are achieved. The rotor variable-mass frequency-modulation dynamic vibration absorber is unique in structure, high in reliability, stable in performance, low in maintenance frequency, flexible in installing position and good in adaptability; besides, the control system is excellent, and active control is easy to achieve.

Description

technical field [0001] The invention belongs to a rotor dynamic vibration absorber used in a rotary machine, relates to the field of mechanical rotor vibration control, in particular to a variable mass frequency modulation dynamic vibration absorber for a rotary machine rotor. Background technique [0002] The vibration of the rotor system is a key issue that restricts the safe and reliable operation of rotating machinery. In the study of rotating machinery, it is of great significance for how to improve the life of the rotor and ensure the safe and stable operation of mechanical equipment by reducing the vibration of the rotor system. A tuned mass damper (TMD) is a dynamic vibration absorber with simple structure and stable performance. In view of its advantages in engineering applications such as easy realization, it is widely used in building structures, roads and bridges, vehicles (ships, aircraft, automobiles), industrial It is widely used in many fields such as machine...

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Problems solved by technology

However, it is limited by the size of the mass cavity and the range of frequency modulation. As mentioned above, the basic rotor changes from the first-order critical speed frequency of 81.7Hz to the stable operating speed frequency of 180Hz, and the mass needs to be changed by 4.85 times.

If the diameter of the cavity remains constant, the width must be enlarged by 4.85 times, and if the width is constant, the diameter must be enlarged by 2.2 times. It is difficult to install such a large-volume cavity limited by the space structure, so the vibration absorber cannot be adjusted in a wide range of frequencies.

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