The aim of this work is to improve the dynamic performances and the bandwidth of a novel multiaxial shaker, to be employed for measuring the three-dimensional apparent mass of a standing person subjected to vibrations. In particular, the first part of the thesis involves the employment of lightweight design principles and composite materials, with the aim of optimizing the mass and the stiffness of the moving parts of the structure: hence, a series of numerical simulations would address the most effective changes to be applied in order to enlarge the system bandwidth. Then, the second part of the work focuses on the implementation of a force measurement system to be installed on the same structure, intended to convert the shaker in a force-sensing platform. The proposed system would allow the measurement of the three spatial components of the force and torque vectors generated at the centre of the moving platform by a standing human body subjected to multiaxial vibrations, thus allowing the evaluation of its apparent mass.
Il presente lavoro si propone di migliorare le prestazioni dinamiche e la banda passante di uno shaker multiassiale, atto a misurare la massa apparente tridimensionale di una persona in postura eretta soggetta a vibrazioni. Nel dettaglio, la prima parte della tesi si fonda sull’utilizzo dei principi del lightweight design e sull’impiego dei materiali compositi, con lo scopo di ottimizzare la massa e la rigidezza delle parti sospese della struttura. Pertanto, grazie all’utilizzo di una serie di simulazioni numeriche, sono state individuate le modifiche più efficaci da apportare al sistema, al fine di incrementarne la banda passante. La seconda parte del lavoro, invece, prevede la trasformazione dello shaker in un sensore di forza, in grado di misurare, lungo i tre assi coordinati, le forze e i momenti generati da una persona in piedi soggetta a vibrazioni multiassiali, facilitandone così la determinazione della massa apparente tridimensionale.
Bandwidth-optimized force platform for a multiaxial shaker
FONTANIERI, ALBERTO
2018/2019
Abstract
The aim of this work is to improve the dynamic performances and the bandwidth of a novel multiaxial shaker, to be employed for measuring the three-dimensional apparent mass of a standing person subjected to vibrations. In particular, the first part of the thesis involves the employment of lightweight design principles and composite materials, with the aim of optimizing the mass and the stiffness of the moving parts of the structure: hence, a series of numerical simulations would address the most effective changes to be applied in order to enlarge the system bandwidth. Then, the second part of the work focuses on the implementation of a force measurement system to be installed on the same structure, intended to convert the shaker in a force-sensing platform. The proposed system would allow the measurement of the three spatial components of the force and torque vectors generated at the centre of the moving platform by a standing human body subjected to multiaxial vibrations, thus allowing the evaluation of its apparent mass.File | Dimensione | Formato | |
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2019_12_Fontanieri.pdf
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https://hdl.handle.net/10589/151545