A control method of variable stiffness and variable damping combined dynamic vibration absorber

Abstract

The invention discloses a control method of a variable-rigidity and variable-damping combination type dynamic shock absorber. The control method comprises the following steps: first, judging whether excitation suffered by a main system belongs to single-frequency excitation or multi-frequency excitation, and then, implementing control strategies according to classes. By adjusting the rigidity and the damping of the shock absorber, classified control can be implemented on the single-frequency excitation and the multi-frequency excitation; for the single-frequency excitation condition, the rigidity and the damping of the shock absorber are adjusted, and the main system can be effectively controlled within a certain frequency band; and for the multi-frequency excitation condition, the rigidity and the damping of the shock absorber are adjusted, the shock absorber is changed into a traditional dynamic shock absorber, the rigidity and damping parameters of the traditional dynamic shock absorber can be adjusted in real time, and the shock absorber is enabled to always keep the optimum tuning frequency and the optimum damping ratio, so that the shock of the main system is effectively controlled.

Description

technical field [0001] The invention relates to test vibration control, in particular to a control method for a combined dynamic vibration absorber with variable stiffness and variable damping. Background technique [0002] Since the invention of Frahm, the dynamic vibration absorber has attracted the attention of many scholars and researchers, and has become an effective device for vibration control. Traditional dynamic shock absorbers are passive dynamic shock absorbers, such as figure 1 As shown, the structure is simple, the cost is low, and the vibration reduction effect is good, but its own parameters cannot be changed once it is designed, the natural frequency and damping cannot be adjusted, and the effective vibration reduction frequency band is narrow. Aiming at the shortcoming of the traditional dynamic absorber's effective vibration reduction frequency band being too narrow, researchers have proposed many types of adaptive dynamic absorbers, such as variable stiff...

AI Technical Summary

Problems solved by technology

Traditional dynamic shock absorbers are passive dynamic shock absorbers, such as figure 1 As shown, the structure is simple, the cost is low, and the vibration reduction effect is good, but its own parameters cannot be changed once it is designed, the natural frequency and damping cannot be adjusted, and the effective vibration reduction frequency band is narrow

Aiming at the shortcoming of the traditional dynamic absorber's effective vibration reduction frequency band being too narrow, researchers have proposed many types of adaptive dynamic absorbers, such as variable stiffness dynamic absorbers, variable mass dynamic absorbers, variable damping dynamic absorbers, and variable stiffness variable mass dynamic absorbers. Compound dynamic shock absorber, variable stiffness variable damping combined dynamic vibration absorber and other types, variable stiffness variable damping combined dynamic vibration absorber such as figure 2 shown

For the above types of dynamic vibration absorbers, researchers have proposed various control methods, but there is still no control method suitable for variable stiffness and variable damping combined dynamic vibration absorbers.

Images