College of Biomedical Engineering & Instrument Science, Zhejiang University, Hangzhou 310027, China.
Department of Mechanical Engineering, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia.
Sensors (Basel). 2019 Jan 7;19(1):186. doi: 10.3390/s19010186.
In practice, a high-dynamic vibration sensor is often plagued by the problem of drift, which is caused by thermal effects. Conversely, low-drift sensors typically have a limited sample rate range. This paper presents a system combining different types of sensors to address general drift problems that occur in measurements for high-dynamic vibration signals. In this paper, the hardware structure and algorithms for fusing high-dynamic and low-drift sensors are described. The algorithms include a drift state estimation and a Kalman filter based on a linear prediction model. Key issues such as the dimension of the drift state vector, the order of the linear prediction model, are analyzed in the design of algorithm. The performance of the algorithm is illustrated by a simulation example and experiments. The simulation and experimental results show that the drift can be removed while the high-dynamic measuring ability is retained. A high-dynamic vibration measuring system with the frequency range starting from 0 Hz is achieved. Meanwhile, measurement noise was improved 9.3 dB through using the linear-prediction-based Kalman filter.
在实际应用中,高动态振动传感器常常受到热效应引起的漂移问题的困扰。相反,低漂移传感器通常具有有限的采样率范围。本文提出了一种结合不同类型传感器的系统,以解决高动态振动信号测量中出现的一般漂移问题。本文描述了融合高动态和低漂移传感器的硬件结构和算法。该算法包括基于线性预测模型的漂移状态估计和卡尔曼滤波。在算法设计中分析了漂移状态向量的维数、线性预测模型的阶数等关键问题。通过仿真示例和实验验证了算法的性能。仿真和实验结果表明,在保留高动态测量能力的同时,可以去除漂移。实现了频率范围从 0 Hz 开始的高动态振动测量系统。同时,通过使用基于线性预测的卡尔曼滤波器,测量噪声提高了 9.3dB。