基于RBF神经网络整定的经纱张力PID控制系统

针对目前国内大多织机经纱张力控制系统采用传统PID控制,对数学模型依赖度高,难于达到较好控制效果的缺陷,提出了一种基于Kalman滤波器的RBF径向神经网络整定的PID控制算法。这种控制算法采用3输入、单输出的RBF径向神经网络对系统性能学习以寻找出最佳的PID组合,Kalman滤波器有效地滤掉了织机中的各种噪声,实现经纱张力值的恒定。仿真实验结果表明,基于神经网络整定的经纱张力控制系统的控制效果和动态性能都明显优于传统PID控制。     

Automatic detection of respiratory rate from electrocardiogram, respiration induced plethysmography and 3D acceleration signals

Respiratory monitoring is increasingly used in clinical and healthcare practices to diagnose chronic cardio-pulmonary functional diseases during various routine activities.Wearable medical devices have realized the possibilities of ubiquitous respiratory monitoring,however,relatively little attention is paid to accuracy and reliability.In previous study,a wearable respiration biofeedback system was designed.In this work,three kinds of signals were mixed to extract respiratory rate,i.e.,respiration inductive plethysmography （RIP）,3D-acceleration and ECG.In-situ experiments with twelve subjects indicate that the method significantly improves the accuracy and reliability over a dynamic range of respiration rate.It is possible to derive respiration rate from three signals within mean absolute percentage error 4.37％ of a reference gold standard.Similarly studies derive respiratory rate from single-lead ECG within mean absolute percentage error 17％ of a reference gold standard.