Highly damped single-chamber pneumatic vibration isolator using effects of thermal conductivity in the air volume

Abstract

State-of-the-art pneumatic isolators have a two-chamber design with metered orifices between the chambers. This arrangement produces energy dissipation necessary to avoid excessive resonance vibration [1]. However, this leads to reduced isolation performance at high frequencies compared to a single-chamber isolator of equivalent total volume. Analysis shows that, while the dynamic process of the air compression in the pneumatic chamber is adiabatic for geometric parameters usually employed in vibration isolators, substantial dissipation of mechanical energy can be achieved by introducing certain thermally conductive features into the chamber. That makes practical a single-chamber design with sufficient damping. The paper presents the optimization of the geometry of thermally conductive features aimed at maximizing the loss factor at the resonance frequency of the isolation system. Experimental results illustrate the concept [2] and demonstrate the increased isolation effect. [1] V. M. Ryaboy, Vibration Control for Optomechanical Systems (World Scientific, 2022), p. 280. [2] Vibration isolation apparatus with thermally conductive pneumatic chamber, and method of manufacture, U.S. patent application No. 17/721834, USPTO, 2022.