Abstract
Modelling the contact between assembled parts is a key point in the design of complex structures.
Uncertainties at the joint parameters arise as a result of randomness in physical properties such
as contact surface, load distribution or geometric details. This is a challenge of concern in the
hearing aid field, where the small lightweight structures present vibration modes at frequencies
within the hearing range. To approach this issue, a model of contacts based on lumped elements
is suggested. The joint parameters are the stiffness of a series of spring elements placed along
the contact surface, which are obtained by minimizing the least squares distance between experimental
and modelled modal frequencies of the complete structure. A key point of the method is
the reduction of the size of the system by means of a substructure synthesis method, which reduces
the computational cost of the optimization. Another strong point is that an experimental modal
analysis of the structure is not required, but only the resonant frequencies and deflection shapes
are needed. A case study where the contact between two assembled plastic parts is examined
is presented. The variability of the resonant frequencies of the assembly due to changes in the
physical properties of the contact is characterised by means of experimental measurements. The
distributions of the identified contact model parameters are found to be related to the variability
of the resonant frequencies.
Original language | English |
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Title of host publication | Proceedings of Novem 2015 |
Number of pages | 14 |
Publication date | 2015 |
Article number | 48913 |
Publication status | Published - 2015 |
Event | Noise and vibration Emerging Technology 2015 - Excelsior Hotel, Dubrovnik, Croatia Duration: 13 Apr 2015 → 15 Apr 2015 |
Conference
Conference | Noise and vibration Emerging Technology 2015 |
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Location | Excelsior Hotel |
Country/Territory | Croatia |
City | Dubrovnik |
Period | 13/04/2015 → 15/04/2015 |