Shape memory alloy （SMA） actuator is a potential advanced component for servo- systems of aerospace vehicles and aircraft. This paper presents a joint with two degrees of freedom （DOF） and a mobility range close t...Shape memory alloy （SMA） actuator is a potential advanced component for servo- systems of aerospace vehicles and aircraft. This paper presents a joint with two degrees of freedom （DOF） and a mobility range close to ±60° when driven by SMA triple wires. The fuzzy proportional-integral-derivative （PID）-controlled actuator drive was designed using antagonistic SMA triple wires, and the resistance feedback signal made a closed loop. Experiments showed that, with the driving responding frequency increasing, the overstress became harder to be avoided at the position under the maximum friction force. Furthermore, the hysteresis gap between the heating and cooling paths of the strain-to-resistance curve expanded under this condition. A fuzzy logic control was considered as a solution, and the curves of the wires were then modeled by fitting polynomials so that the measured resistance was used directly to determine the control signal. Accurate control was demonstrated through the step response, and the experimental results showed that under the fuzzy PID-control program, the mean absolute error （MAE） of the rotation angle was about 3.147°. In addition, the investigation of the external interference to the system proved the controllable maximum output.展开更多
针对车载飞轮储能系统FESS(flywheel energy storage system)在转速和负载变化下的稳定控制问题,提出了基于模糊比例-积分-微分PID(proportional integral derivative)控制的开关磁阻飞轮储能充放电控制策略。该策略依据系统基本结构原...针对车载飞轮储能系统FESS(flywheel energy storage system)在转速和负载变化下的稳定控制问题,提出了基于模糊比例-积分-微分PID(proportional integral derivative)控制的开关磁阻飞轮储能充放电控制策略。该策略依据系统基本结构原理,构造参数自适应的模糊PID控制器和充放电控制模型,充电时,采用转速-电流双闭环进行控制,其中转速外环采用模糊PID控制、电流内环采用低速电流斩波和高速角度位置控制来实现不同转速下的稳定运行;放电时,采用电压-电流双闭环控制,稳定输出电压的同时起到限制电流的作用。最后,多工况运行仿真结果验证了模糊PID控制可以有效提高响应速度、降低转速和电压超调,充放电控制策略实现了FESS在转速和负载突变下的稳定运行。展开更多
基金co-supported by the National Natural Science Foundation of China (61175104)National Science and Technology Support Program of China (2012BA114B01)
文摘Shape memory alloy （SMA） actuator is a potential advanced component for servo- systems of aerospace vehicles and aircraft. This paper presents a joint with two degrees of freedom （DOF） and a mobility range close to ±60° when driven by SMA triple wires. The fuzzy proportional-integral-derivative （PID）-controlled actuator drive was designed using antagonistic SMA triple wires, and the resistance feedback signal made a closed loop. Experiments showed that, with the driving responding frequency increasing, the overstress became harder to be avoided at the position under the maximum friction force. Furthermore, the hysteresis gap between the heating and cooling paths of the strain-to-resistance curve expanded under this condition. A fuzzy logic control was considered as a solution, and the curves of the wires were then modeled by fitting polynomials so that the measured resistance was used directly to determine the control signal. Accurate control was demonstrated through the step response, and the experimental results showed that under the fuzzy PID-control program, the mean absolute error （MAE） of the rotation angle was about 3.147°. In addition, the investigation of the external interference to the system proved the controllable maximum output.
文摘针对车载飞轮储能系统FESS(flywheel energy storage system)在转速和负载变化下的稳定控制问题,提出了基于模糊比例-积分-微分PID(proportional integral derivative)控制的开关磁阻飞轮储能充放电控制策略。该策略依据系统基本结构原理,构造参数自适应的模糊PID控制器和充放电控制模型,充电时,采用转速-电流双闭环进行控制,其中转速外环采用模糊PID控制、电流内环采用低速电流斩波和高速角度位置控制来实现不同转速下的稳定运行;放电时,采用电压-电流双闭环控制,稳定输出电压的同时起到限制电流的作用。最后,多工况运行仿真结果验证了模糊PID控制可以有效提高响应速度、降低转速和电压超调,充放电控制策略实现了FESS在转速和负载突变下的稳定运行。
