Zhang Hongmei

The Mathematical Model of A Novel Linear Actuator and its Control Strategy

The magnetically controlled shape memory alloy (MSMA) is a new type of functional materials, which has large strain and high efficiency of electromechanical energy conversion. In this paper, the work principle of the MSMA linear actuator is introduced, and based on the analysis and design on magnetic circuit and winding, the dynamic model of MSMA actuator and the simulating curves are given. After the control system is designed, the MSMA actuator prototype is proposed. The experimental results verify the models validity and practicability of MSMA in intelligent system.

On a novel self-sensing actuator

The magnetically controlled shape memory alloy is a new type of shape memory alloy, which alters its magnetization and the surrounding magnetic field when the material is subjected to mechanical straining. With the characteristics, a novel self-sensing actuator scheme was proposed. Based on the analysis of the operation principle, the magnetic circuit modeling was established, and the relationship between induced voltage and speed was studied. The self-sensing actuator prototype and the experimental results were given. The results demonstrate that the induced voltage value reaches 46 V when the MSMA material is mechanically compressed. Relating to the geometrical and material parameters of the MSMA actuator, the induced voltage is proportional to the speed. The research provides the theoretic and experimental basis for the application of MSMA in intelligent systems.

Chaotic Synchronization of Exponent Stability by Nonlinear FeedbackBased on the Bounded Property

Exponent stability is considered as a higher level of stability than asymptotic stability. To realize chaotic synchronization with better synchronization capability, a theory of exponent stability was introduced to the research of chaotic synchronization, and an approach of chaotic synchronization with exponent stability of the synchronization error system was discussed. On the premise that the states of the aim chaotic system were observable, an approach of exponent stability by nonlinear feedback control based on the bounded property of the tracks was proposed for the chaotic synchronization, which made the chaotic synchronization errors satisfy exponent stability, and realized the chaotic synchronization in according to exponent stability. That is to say, the capability of chaotic synchronization was improved, while the chaotic systems arrived at the chaotic synchronization. Theory analysis and simulation results had proved the feasibility and validity of the approach. When applied in the fields of chaotic secure communication and others, the prospect will be perfect.