摘要
为了改进低压气动伺服系统的性能,设计了一种脉宽调制(PWM)线性化控制方法,利用脉宽调制技术取代继电控制方式实现对两个开关阀的控制,通过对PWM控制信号进行傅立叶变换证明了系统输出为线性稳定输出与高次谐波干扰产生输出的叠加,并推导出由这种控制方法产生的固有抖动的振幅与负载的关系以及系统稳态输出的计算公式.仿真结果表明这种控制方法提高了系统的自振频率,减小了固有抖动的振幅.
To improve the performance of a low-pressure pneumatic servo system,a pulse-width modulation（PWM） linearization control method is proposed.The relay control method is replaced by PWM technology to control two switching valves of the system.By using Fourier transform,the output of the system is proved to be the superimposition of two outputs which are generated by the linear segment and the higher harmonic.The relation between the amplitude of the dither and load is computed and the steady-state output of the system is resolved.Simulation results show that the control method raises the system＇s natural frequency and decreases the amplitude of the dither.
出处
《控制理论与应用》
EI
CAS
CSCD
北大核心
2010年第4期538-542,共5页
Control Theory & Applications
基金
国家杰出青年科学基金资助项目(51685168)
教育部重点科研基金资助项目(02152)
关键词
气动控制
脉宽调制(PWM)
抖动振幅
自振频率
pneumatic control
pulse width modulation（PWM）
amplitude of the dither
natural frequency
