Application of Adaptive Kalman Filter in Online Monitoring of Mine Wind Speed

Abstract

The underground complicated testing environment and the fan operation instability cause large random errors and outliers of the wind speed signals. The outliers and large random errors result in distortion of mine wind speed monitoring, which possesses safety hazards in mine ventilation system. Application of Kalman filter in velocity monitoring can improve the accuracy of velocity measurement and eliminate the outliers. Adaptive Kalman Filter was built by automatically adjusting process noise covariance and measurement noise covariance depending on the differences between measured and expected speed signals. We analyzed the fluctuation of airflow flow using data of wind speed flow and distribution characteristics of the tunnel obtained by the Laser Doppler Velocimetry system (LDV) studies. A state-space model was built based on the tunnel airflow fluctuations and wind speed signal distribution. The adaptive Kalman Filter was calculated according to the actual measurement data and the Expectation Maximization (EM) algorithm. The adaptive Kalman filter was used to shield fluid pulsation while preserving system-induced fluctuations. Using the Kalman filter to treat offline wind speed signal acquired by LDV, the reliability of Kalman filter wind speed state model and the characteristics of adaptive Kalman Filter were investigated. Results showed that the adaptive Kalman filter effectively eliminated the outliers and reduced the root-mean-squares error (RMSE), and the adaptive Kalman filter had better performance than the traditional Kalman filter in eliminating outliers and reducing RMSE. Field experiments in online wind speed monitoring were conducted using the optimized adaptive Kalman Filter. Results showed that adaptive Kalman filter treatment could monitor the wind speed with smaller RMSE compared with LVD monitor. The study data demonstrated that the adaptive Kalman filter is reliable and suitable for online signal processing of mine wind speed monitor.

Variation of Indoor Airflow Patterns under Dynamic Outdoor Wind Conditions in Large Space Naturally Ventilated Buildings

“…Fig. 4 shows the original wind speed profile after Kalman filtering (KF) ( [8]) from 12:00 to 12:10. By filtering the noise signal, the overall wind speed dynamic trend is obtained from the complex raw field data.…”

Intelligent ventilation-on-demand control system for the construction of underground tunnel complex

“…To correct monitoring data errors, experiments have shown that the turbulence data represented by mine ventilation data were consistent with Gaussian noise [13]. A computation-feedback-correction mechanism for the accurate correction of wind resistance data obtained during ventilation has been proposed to calculate roadway airflow [14]. An adaptive Kalman filter based on an expectation-maximization algorithm was proposed to shield fluid pulsations while preserving system-induced fluctuations [15].…”

SDAE Cleaning Model of wind Speed Monitoring Data in the Mine Monitoring System

“…however, there are few studies on cleaning methods of mine speed monitoring data in coal mines. huang et al [18] used the Laser Doppler Velocimetry system to obtain wind speed data and applied the adaptive Kalman filter model to clean outliers of wind speed data. however, when the data is missing for a long time, the data after cleaning by this method has a large deviation from the original.…”