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Vibration characteristics of 45∘ pitched blade impellers (PBIs) operating in a standard baffled mixing vessel were studied. Experiments were conducted for eight different impeller configurations with combinations of: numbers of impellers (single or double), diameter to tank diameter ratios D/DT = 1/2 and 5/7, and impeller spacing of 0, 0.75D, and 1.5D. The impeller orbit frequency and shape, mean...