Torsional vibration suppression method
Torsional vibrations are common in dual mass systems (DoubleMassSystem) or dual inertia systems (Double Ineftia System). The existence of torsional vibration affects the accuracy of the system. For the suppression of torsional vibration, many scholars have studied it and obtained many control methods to suppress torsional vibration, such as PID-based control, observer-based control, filter-based and Notch control, H∞ control, resonance ratio control, and intelligent control. The vibration suppression method has been developed to date, and a composite control method combining various methods has been formed.
1.1 Analysis of typical torsional vibration suppression composite method
The use of a certain control strategy to suppress torsional vibration has its own drawbacks, such as the use of PID control alone. When the input changes, the PID parameters need to be re-tuned and adaptively poor; and if the trap is used alone, the suppression of high-frequency vibration is effective. In order to improve the vibration suppression method and make it adaptive, robust and so on, the control method formed by the combination of various vibration suppression methods can effectively achieve this goal, but at the same time it also creates new problems. Several typical composite control methods are analyzed below.
1.1.1 Observer-based composite vibration suppression method
The ratio of the anti-resonance frequency to the resonant frequency in a dual inertia system is related to the inertia ratio, which has a large effect on the performance of the vibration suppression control. The domain makes the system have a wider compromise between proper robustness and vibration suppression, which enhances the robustness of the system.
1.1.2 Composite vibration suppression method based on notch filter
Filters and notches play an important role in vibration suppression of dual inertia systems. Lu Jin et al. proposed a method of adding a notch filter to a PI controller, which filters the harmonic components in the velocity by a notch filter to suppress the torsional vibration.
1.2 Comparison of Torsional Vibration Suppression Methods
In summary, the traditional PI control system is relatively simple, but the effect of reducing vibration is not obvious, in the process of using PID control. Once the parameters are set, they cannot be changed, and the robustness is poor. Filters and notches can suppress high-frequency vibration, automatically identify the vibration frequency, automatically adjust the parameters, and have strong adaptability and robustness, but the system The dynamic influence is large; the resonance ratio control (RRC) has a good suppression ability when the resonance frequency anti-resonance frequency value is large. The intelligent control method system is complex but has good adaptability and robustness; H∞ control can effectively control the robustness of the system, but the method comes at the expense of the dynamics of the system.
