Abstract: In the dynamic detection of the separated bulk matter in scattered material conveying systems, the impact force of falling bulk matter is a kind of random dynamic interference, and impairs the measurement accuracy severely. An impact model of the bulk matter based on the momentum theory is built, and a recursive filtering method is put forward to restrain the instantaneous impact force. In order to fulfill the requirement of realtime and solve the problem of slow convergence speed of iterative recurrence, a convergence factor is introduced to modify the current interactive value by one-step recursive residual error, so that the interactive recurrence process for estimating the instantaneous impact force is accelerated greatly. According to this method, an approach iterative filter for the separated bulk matte is built, which consists of three algorithm units, i.e. impact force estimation, reference model calculation and impact force filtering. Thereby, through the real time identification of impact force, the actual weight of separated bulk matter can be quickly and approximately calculated. This dynamic detection method can greatly improve the stability and accuracy of bulk matter measurement .

Key words: Bulk-matter, Conveyer system, Dynamic detection, Impact force model, Recursive filter