طراحی و تحلیل عددی یک جداساز ارتعاش با سختی شبه صفر

Unwanted mechanical vibrations are among the major challenges in sensitive and precision systems, as they can lead to performance degradation, component wear, and functional errors. The aim of this study is to design and investigate a mechanical metamaterial structure exhibiting quasi-zero stiffness behavior in order to improve low-frequency vibration isolation. To this end, a representative unit cell combining positive stiffness elements and pre-buckled beams as negative stiffness components is designed and numerically analyzed.

Static and dynamic analyses are performed using COMSOL Multiphysics and MATLAB. In the static analysis, the structural behavior is evaluated by extracting the force–displacement curve and identifying the quasi-zero stiffness region. To assess the dynamic performance, the system response under harmonic base excitation over a range of frequencies is computed, and vibration transmissibility is employed as the main evaluation criterion.

The numerical results demonstrate that appropriate tuning of the geometric parameters enables effective control over the stability range and the quasi-zero stiffness region of the structure. Furthermore, frequency-domain analysis indicates a noticeable reduction in vibration transmissibility within a specific low-frequency band compared to an equivalent linear model. These findings confirm that mechanical metamaterial structures with quasi-zero stiffness characteristics can provide an effective and compact solution for low-frequency vibration isolation.