A control method and system for suppressing global mechanical resonance

Abstract

The present invention provides a control method for suppressing global mechanical resonance, including: S1: establishing a controlled object system, the controlled object system includes: a controlled mechanical structure, a motor and a sensor set on the controlled mechanical structure device; S2: Obtain the corresponding finite element model through the three-dimensional model of the controlled mechanical structure; S3: Establish a mathematical model describing the vibration of the finite element node (1); S4: Obtain the mathematical model under the modal coordinates (2); S5: Establish the state space model of each mode decoupling (3); S6: Obtain the transfer function matrix model (5); S7: Define the space H 2 norm; S8: Aiming at the system described by formula (5), calculate its 2 Equivalent system in the sense of norm; S9: design space H 2 The optimal controller under the norm is to obtain a controller capable of global vibration suppression; S10: apply the optimal controller to the controlled mechanical structure to perform global vibration suppression.

Description

technical field [0001] The invention relates to automatic control theory, in particular to a control method and system for suppressing global mechanical resonance. Background technique [0002] Mechanical systems are widely used in various industrial and high-tech fields, such as various mechatronic industrial equipment, aerospace vehicles, bridge construction, etc. However, the inherent resonance phenomena of mechanical systems limit the further development of their applications. For example, in precision motion systems, mechanical resonances limit further improvements in precision; resonances in solar panels on spacecraft and aircraft wings can have damaging results. Using the motor and sensing device to actively control the mechanical resonance can reduce or even eliminate the influence of the mechanical resonance on the system. At present, the main methods of active control of mechanical resonance are focused on: using a vibration sensing device to measure the vibratio...

AI Technical Summary

Problems solved by technology

Mechanical resonance exists in every position of the system, but this method can only ensure that the vibration of the system at the position of the sensing device is suppressed, and it is helpless for vibrations that cannot be observed by the sensing device

At the same time, the position of the disturbance will change during the operation of the system. The current methods do not consider the robustness of the system to the change of the disturbance position.

[0003] In summary, the currently proposed methods cannot address the suppression of global mechanical resonances

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