Analytical analysis of vibration isolation characteristics of quasi-zero stiffness suspension backpack

During prolonged walking or vigorous running, heavy military backpacks induce vibrations that adversely affect the shoulders and joints. These low-frequency vibrations pose a significant challenge in reducing backpack vibration loads. Conventional isolators face difficulties in balancing load-bearing and stability requirements inherent in low-frequency vibration control. This study proposes an innovative quasi-zero stiffness suspended backpack and conducts a comprehensive investigation into its dynamic modeling and response characteristics. By employing the harmonic balance method, the force transmission characteristics of the novel suspended backpack are scrutinized. The findings highlight the effectiveness of the quasi-zero stiffness suspended backpack in significantly reducing the dynamic loads imposed on the human body compared to conventional linear suspension mechanisms.