Application of in-situ blocked forces for characterising structure borne vibration of heavy industrial machinery

Abstract

Industrial machinery can generate excessive vibration, potentially reducing their productivity and disturbing their surroundings. Thus, it is essential to control vibration in industrial environments and accurate predictions are required to adopt mitigation measures in the initial design stages. It is first necessary to perform measurements on the vibration source to characterise its operational behaviour, and the obtained properties can be expressed in terms of its blocked forces according to ISO 20270:2019. The data can be obtained from the source mounted on a specific receiver, but still deliver intrinsic quantities that remain valid for any different receiver structures. Although good agreements have already been achieved between predictions and on-board validations from light weight structures, proving the theory is well understood, it has not yet been applied effectively to heavier assemblies which will be the focus of this work. A source characterisation case study is presented in this paper for a typical heavy industrial installation known as a press softly mounted on an inertia block isolated from the surrounding factory floor. A description of how the passive properties of the press were obtained and vibration predictions at different positions of the coupled assembly will also be given.