中文摘要：

为满足电控喷油器球阀开闭的要求,设计了强偏置超磁致伸缩致动器。阐述了强偏置超磁致伸缩致动器的工作原理,基于其偏置特征分析了致动器适用的正弦波信号。根据磁阻理论、J-A模型、二次畴转模型和线性系统理论建立了强偏置致动器的准静态位移模型,计算了此模型致动器方波输入时位移幅值和电流幅值的关系,正弦波输入时位移-电流滞环曲线,幅值为3 A的方波电流输入时的致动器位移输出。设计了强偏置致动器的试验系统,通过同幅值反向的方波信号辨别输入方向,并进行了致动器的方波和正弦波测试。结果表明：模型计算得到的方波位移幅值特性以及谐波位移-电流滞环与试验结果吻合,由此验证了模型的准确性;强偏置致动器在3 A方波电流输入时位移超过30μm,响应时间约为10μs,超调量为零,具有较好的驱动性能。

英文摘要：

Giant magnetostrictive actuator characterized with strong bias magnetic field was designed to control the injector bullet valve opening and closing. Working principle of the actuator was described and suitable sinusoidal signals were analyzed by its bias characteristics. Semi-static model of the actuator displacement was established through reluctance theory,J-A model,quadratic domain-transfer model and linear system theory. Based on the model,the relationship between displacement and current amplitude under square signal was achieved,so did the displacement-current curve under sinusoidal signal and the displacement-time curve under square signal with the amplitude of 3 A. Experimental system for the actuator was established,and the signal directions were recognized by testing under square signals with the same value while opposite directions. The testing displacements under sinusoidal and square signals were acquired. From the results,the displacement amplitudes under square signals and displacementcurrent curves under sinusoidal signals,calculated through the model,were similar to the testing results.Then the validation of the semi-static model was verified. The simulation of the actuator with an ordinary electrical injector input was done. With the square signal input in the amplitude of 3 A,the steady-state displacement of the actuator was above 30 μm,responding time was about 10 μs,and overshoot was 0.The simulating results showed good performance of the actuator.