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Abstract
The paper presents a study of the vibrations in the load cell response of automatic weight fillers for fluids, due to the dynamics of the system. The aim is to characterize vibratory phenomena through both experimental and model-based analysis, in order to identify the main causes and identify compensation strategies. Two test campaigns were conducted, on a test bench and on a sixteen stations machine, with the simultaneous acquisition of acceleration signals and load cell signals. A detailed sensitivity analysis based on experimental data, as many system parameters vary, has been developed. For the system modelling, a one Degree of Freedom (1 DoF) model, with lumped parameters and time-variant mass, including fluidic forces, was considered and numerically implemented. Genetic algorithms were used for the identification problems in the model-based analysis. The model allowed a deeper understanding of the phenomena that occur, showing promising results for the vibration prediction in a compensation process.
Highlights
In the consumer goods industries, a common task is to fill bottles with an exact quantity of liquid
In [15], the model is used for a hydrodynamic force correction to enhance the flow measurement accuracy; in the current paper, the aims are the identification of the potential sources of vibrations, for a possible elimination and a prediction of vibratory phenomena for compensation
Central controller constantly monitors the load cell measurement, assuring the control of the supplied consequent vibration must be promptly damped, so that the zero position can be reset and the new cycle can start. The presence of these vibrational phenomena represents a critical issue for the optimal functioning of the weight filler; for this reason, an experimental campaign is proposed for the characterization of the machine dynamics
Summary
In the consumer goods industries, a common task is to fill bottles with an exact quantity of liquid (juice, water, oil, drink, detergent, etc.). A theoretical analysis, based on a one degree of freedom spring-damper with variable mass model, has been considered to study the dynamics of the weighing process and to develop a method for predicting vibratory phenomena. This model-based approach was applied for the first time by the authors [8] to the problem of dynamic weighing in filling machines, where the mass is time-variant. In [15], the model is used for a hydrodynamic force correction to enhance the flow measurement accuracy; in the current paper, the aims are the identification of the potential sources of vibrations, for a possible elimination and a prediction of vibratory phenomena for compensation.
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