A DWT and ANC-based continuous weighing scheme of bulk materials in belt conveyor

For the normal operation of the belt checkweigher, it becomes the important challenges to measure accurately the total weight of bulk materials with the non-uniformly piled with a belt and the weight of each packaged product moving in fast speed. These conveyor-type checkweighers cause errors in weighing due to many factors such as structure, installation, operating and environmental conditions. This paper suggests a new hybrid weighing scheme using the discrete wavelet transform (DWT) and adaptive noise cancellation (ANC) to weigh the successively conveyed bulk material. This scheme uses wavelet decomposition and reconstruction to remove noises with high frequencies and uses adaptive filter to suppress noises with low frequencies. The simulation and experimental results show that this scheme remove optimally various type of noises to measure the weight with accuracy degree of ±0.5%.