Abstract
A nodal beam isolation system allows the transmission of vibration from the source to an isolated element to be limited using nodal points on the elastic beam connecting them. These points are selected in such a way that their position during vibration is constant. The application of a helical spring as an elastic beam reduces the dimensions of the system and increases its applications. An effective computational model of the nodal beam isolation system based on a helical spring application as an elastic beam is presented in the paper. The model allows the position of nodal points to be determined for a given excitation frequency. It also allows the influence of system parameters on spring vibration amplitudes and static stiffness of the connection between the source and isolated element to be analysed. The analysis makes it possible to formulate conclusions facilitating the designer to select the proper system parameters for the given operating conditions. The results of numerical and experimental tests exhibit high compliance with the results of the presented model.
Highlights
The nodal beam vibration isolation system consists of a vibrating object connected to an isolated structure by means of an elastic beam
The second important advantage is the relatively high static stiffness of the connection between the vibration source and the isolated object. This method can be applied to control handle vibration in machines such as jackhammers, rammers, plate compactors, hand tractors, or grass trimmers [3]. Operators of such machines experience high levels of vibration in the hand and arm [4,5,6,7,8], which can lead to health problems [9,10,11,12] called hand-arm vibration syndrome (HAVS)
The theoretical model allows the influence of excitation frequency on the location of the nodal point and amplitude value of displacement and angle along the spring axis to be estimated
Summary
The nodal beam vibration isolation system consists of a vibrating object connected to an isolated structure by means of an elastic beam. The external force of amplitude P excites vibrations with such a frequency ω that two nodal points appear symmetrically along the beam axis at which the vibration displacement is zero This method can be applied to isolate systems vibrating with a constant frequency. The second important advantage is the relatively high static stiffness of the connection between the vibration source and the isolated object Thanks to these advantages, this method can be applied to control handle vibration in machines such as jackhammers, rammers, plate compactors, hand tractors, or grass trimmers [3]. The selection of spring parameters should ensure, at the same time, a relatively high transverse stiffness of the connection between the vibrating object and the isolated structure, low maximum amplitudes of spring transverse vibrations in working conditions, and small dimensions of the system. The aim of this study is the analysis of a nodal beam vibration isolation system based on a helical spring and creation of a model allowing parameters of the spring to be selected in order to meet given requirements
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