A feedback linearized sliding mode control method for vibration isolation of a hybrid magnetostrictive actuator and air spring.

By combining a giant magnetostrictive actuator with an air spring and employing a feedback linearized sliding mode control method, the problems of small deformation and nonlinear hysteresis in traditional vibration isolation technology are solved, achieving precise control and robustness of the hybrid vibration isolation system, and adapting to the vibration isolation requirements of large displacement or large vibration amplitude.

CN120143615BActive Publication Date: 2026-05-26INST OF ENG MECHANICS CHINA EARTHQUAKE ADMINISTRATION
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
INST OF ENG MECHANICS CHINA EARTHQUAKE ADMINISTRATION
Filing Date
2025-03-13
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Traditional vibration isolation technology cannot meet the requirements of precision equipment for large displacement or large vibration amplitude. Giant magnetostrictive actuators have problems with small deformation and nonlinear hysteresis. Furthermore, feedback linearization control is prone to instability due to unconsidered factors, and sliding mode control suffers from chattering.

Method used

By combining a giant magnetostrictive actuator with an air spring, a constitutive equation considering eddy current loss, temperature effect and prestress is established through a feedback linearized sliding mode control method. The dynamic balance equation of the hybrid vibration isolation system is constructed, and the feedback linearized sliding mode control strategy is used for control, and a smooth tanh function is used to reduce chattering.

Benefits of technology

Precise control of a hybrid vibration isolation system combining a giant magnetostrictive actuator and an air spring has been achieved, adapting to different application scenarios, improving the robustness and dynamic performance of the system, reducing chattering, and meeting the vibration isolation requirements for large displacements or large vibration amplitudes.

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Abstract

A feedback linearized sliding mode control method for hybrid vibration isolation of a supermagnetostrictive actuator and an air spring belongs to the field of electronic design modeling technology. To ensure precise control of the hybrid vibration isolation system of the supermagnetostrictive actuator and air spring, this invention considers the effects of eddy current loss, temperature effect, and prestress, establishes the relationship between the expansion rate of the supermagnetostrictive material and the magnetic field strength, and constructs the constitutive equation of the supermagnetostrictive actuator; it also establishes the dynamic equilibrium equation of the hybrid vibration isolation system of the supermagnetostrictive actuator and air spring; it uses a feedback linearized sliding mode control strategy to control the dynamic equilibrium equation of the hybrid vibration isolation system of the supermagnetostrictive actuator and air spring, obtaining the feedback linearized sliding mode control equation; based on the feedback linearized sliding mode control equation and the relationship between the expansion rate of the supermagnetostrictive material and the magnetic field strength, a control method for the hybrid vibration isolation system of the supermagnetostrictive actuator and air spring is constructed. This invention provides precise control.
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