1 空军工程大学,a.航空机务士官学校, 河南 信阳 464000
2 空军工程大学,b.航空工程学院, 西安 710038
针对航空发动机非线性分布式控制系统的故障检测问题, 首先, 通过辨识方法建立了具有多项式组合形式的航空发动机非线性模型, 并考虑网络因素, 建立了具有随机时延的航空发动机非线性分布式控制系统模型。然后, 把非线性分布式控制系统看成是一种随机系统, 为其设计了非线性的故障观测器, 应用Lyapunov稳定性理论和随机系统均方渐近稳定理论推导了故障观测器误差系统均方渐近稳定的线性矩阵不等式条件, 并求得了线性矩阵不等式的可行解。最后, 给出了具体的故障检测步骤, 并通过仿真计算验证了所提算法的有效性。
航空发动机 故障检测 非线性系统 稳定性分析 故障观测器 aeroengine fault detection nonlinear system stability analysis fault observer
Author Affiliations
Abstract
1 Department of Electronic and Information Engineering, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen 518055, China
2 Photonics Research Center, Department of Electrical Engineering, The Hong Kong Polytechnic University, Hong Kong, China
3 Photonics Research Center, Department of Electronic and Information Engineering, The Hong Kong Polytechnic University, Hong Kong, China
We propose and experimentally demonstrate a universal and blind polarization-state tracking scheme for M-quadrature amplitude modulation (QAM) signals based on a decision-free radius-directed linear Kalman filter (RD-LKF). The polarization tracking performance is investigated through simulation and experiments for both quadrature phase-shift keying (QPSK) and 16-QAM signals. The influence of the filter parameters on the static polarization demultiplexing performance and dynamic tracking capability are discussed via simulation. The optimization strategy of the filter parameters in modulation-format-independent scenarios is proposed and simulations are carried out to evaluate the polarization demultiplexing penalty for QPSK, 16QAM, and hybrid QPSK/16QAM signals. Finally, the proposed decision-free RD-LKF is experimentally compared to the respective algorithms of constant modulus algorithm and multimodulus algorithm for QPSK and 16-QAM and the advantage of ultrafast polarization tracking ability is confirmed.
060.1660 Coherent communications 120.3930 Metrological instrumentation Chinese Optics Letters
2016, 14(11): 110601
哈尔滨工业大学深圳研究生院, 广东 深圳 518055
在偏振复用(PDM)高速光通信系统的相干检测中，需要实现信号偏振态和载波相位的快速跟踪。将扩展卡尔曼滤波器用在偏振复用16进制正交振幅调制(PDM-16QAM)光调制信号相干接收机中，成功实现了偏振态和载波相位的快速精确跟踪。在单信道112 Gb/s PDM-16QAM传输系统中，数值仿真发现，扩展卡尔曼滤波器所能跟踪的最大偏振态旋转速率可达级联多模算法的100倍，而且具有很好的收敛精度，其收敛速度和精度可以通过调优参量控制。使用扩展卡尔曼滤波器跟踪100 kHz线宽18 Mrad/s偏振态旋转信号时，10-3误码率(BER)对应的接收机灵敏度代价仅为0.2 dB。研究了应用于长距离传输光通信系统的扩展卡尔曼相干接收的性能。
光通信 偏振和相位跟踪 扩展卡尔曼 光学学报
2014, 34(12): 1206005
