• Weaver, Pm
• Neild, Simon
• Carrella, A.
• Wagg, D. J.
• Shaw, A. D.

Abstract

<p>Vibration isolation is an important requirement throughout much of engineering. Furthermore, interest in adding multifunctionality to composite materials has led to work on bistable composite structures, that can 'snap' between two different shapes. The current work investigates a passive vibration isolation mount that implements the High Static Low Dynamic Stiffness (HSLDS) concept. The HSLDS concept promotes vibration isolation by reducing dynamic stiffness and therefore natural frequency, whilst preserving weight bearing capacity by maintaining good static stiffness. The snap-through of a bistable composite plate is used as a negative stiffness nonlinear spring, which is connected in parallel with linear springs to provide the required nonlinear spring response. We present the experimental dynamic response of a mass-spring system using this nonlinear spring, subjected to harmonic base excitation. We also present the quasi-static force displacement response of the plate, and use a mathematical function fitted to this data to make theoretical predictions for the dynamic response. Experimental results show good agreement with theoretical predictions.</p>

Topics

• impedance spectroscopy
• composite