Abstract
Abstract
A method is presented for predicting the stability of the rotating arms of a rotary sewage distributor incorporated into a trickling filter. The method is derived, tested via various laboratory demonstrations and employed for evaluating the stability of experimental and production distributors using a calculation based upon the distributor's experimentally determined stiffness matrix. The method correctly models the stability behaviour of the laboratory rigs and confirms the observation that the experimental distributor is on the borderline of stability, while the production distributor is stable by a comfortable margin. A procedure is then developed for predicting the stability of a distributor prior to construction, using a finite element model to calculate the distributor's stiffness matrix.
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