基于永磁同步电机(PMSM)无传感器矢量控制性能要求,提出一种无传感器PMSM非线性系统参数辨识最优自适应中心差分估计(Adaptive Central Divided Kalman Filtering,ACDKF)方法.该法基于Bayesian最优估计框架,利用Stirling多项式插值逼近...基于永磁同步电机(PMSM)无传感器矢量控制性能要求,提出一种无传感器PMSM非线性系统参数辨识最优自适应中心差分估计(Adaptive Central Divided Kalman Filtering,ACDKF)方法.该法基于Bayesian最优估计框架,利用Stirling多项式插值逼近确定Sigma采样点及其权值,构建CDKF估计算法;同时考虑系统噪声统计时变统计特性,基于估计信息和残差实现噪声自适应在线估计调整,面向永磁同步电机复杂工况条件下观测电流信号,实时估计转子转速和角位移.仿真结果表明该方法既能获得较高的估计精度,又能有效改善估计计算稳定性,满足永磁同步电机无传感器矢量控制性能要求.展开更多
We propose a novel method for seismic noise attenuation by applying nonstationary polynomial fitting （NPF）, which can estimate coherent components with amplitude variation along the event. The NPF with time-varying ...We propose a novel method for seismic noise attenuation by applying nonstationary polynomial fitting （NPF）, which can estimate coherent components with amplitude variation along the event. The NPF with time-varying coefficients can adaptively estimate the coherent components. The smoothness of the polynomial coefficients is controlled by shaping regularization. The signal is coherent along the offset axis in a common midpoint （CMP） gather after normal moveout （NMO）. We use NPF to estimate the effective signal and thereby to attenuate the random noise. For radial events-like noise such as ground roll, we first employ a radial trace （RT） transform to transform the data to the time-velocity domain. Then the NPF is used to estimate coherent noise in the RT domain. Finally, the coherent noise is adaptively subtracted from the noisy dataset. The proposed method can effectively estimate coherent noise with amplitude variations along the event and there is no need to propose that noise amplitude is constant. Results of synthetic and field data examples show that, compared with conventional methods such as stationary polynomial fitting and low cut filters, the proposed method can effectively suppress seismic noise and preserve the signals.展开更多
文摘基于永磁同步电机(PMSM)无传感器矢量控制性能要求,提出一种无传感器PMSM非线性系统参数辨识最优自适应中心差分估计(Adaptive Central Divided Kalman Filtering,ACDKF)方法.该法基于Bayesian最优估计框架,利用Stirling多项式插值逼近确定Sigma采样点及其权值,构建CDKF估计算法;同时考虑系统噪声统计时变统计特性,基于估计信息和残差实现噪声自适应在线估计调整,面向永磁同步电机复杂工况条件下观测电流信号,实时估计转子转速和角位移.仿真结果表明该方法既能获得较高的估计精度,又能有效改善估计计算稳定性,满足永磁同步电机无传感器矢量控制性能要求.
基金supported by the National Basic Research Program of China (973 program, grant 2007CB209606) the National High Technology Research and Development Program of China (863 program, grant 2006AA09A102-09)
文摘We propose a novel method for seismic noise attenuation by applying nonstationary polynomial fitting （NPF）, which can estimate coherent components with amplitude variation along the event. The NPF with time-varying coefficients can adaptively estimate the coherent components. The smoothness of the polynomial coefficients is controlled by shaping regularization. The signal is coherent along the offset axis in a common midpoint （CMP） gather after normal moveout （NMO）. We use NPF to estimate the effective signal and thereby to attenuate the random noise. For radial events-like noise such as ground roll, we first employ a radial trace （RT） transform to transform the data to the time-velocity domain. Then the NPF is used to estimate coherent noise in the RT domain. Finally, the coherent noise is adaptively subtracted from the noisy dataset. The proposed method can effectively estimate coherent noise with amplitude variations along the event and there is no need to propose that noise amplitude is constant. Results of synthetic and field data examples show that, compared with conventional methods such as stationary polynomial fitting and low cut filters, the proposed method can effectively suppress seismic noise and preserve the signals.
