Zero-Stiffness Impact Isolation Structure Without Parallel Mechanisms

The patent replaces active sensing and feedback control systems with a passive mechanical system. The half-hourglass-shaped boss structure with thickness gradient creates a mechanical force balance that automatically achieves zero-stiffness characteristics without requiring sensors, controllers, or power sources. This substitution eliminates complex electronic systems while maintaining impact load control capability.

The device achieves self-regulation through its mechanical structure. The thickness gradient of the half-hourglass-shaped boss automatically adjusts the force distribution based on the impact conditions, with no external control needed. The system serves itself by using the impact energy to maintain the zero-stiffness state through inherent mechanical properties.

The patent employs asymmetric half-hourglass-shaped bosses with thickness gradients that are not uniform. This asymmetric geometry creates specific force distribution characteristics that achieve zero-stiffness without requiring precise parallel alignment. The asymmetric shape inherently compensates for installation variations, reducing the stringency of position accuracy requirements.

The patent changes the geometric parameters of the boss structure by introducing a thickness gradient. This parameter variation allows the structure to achieve zero-stiffness characteristics through its geometry alone, rather than relying on precise parallel connection of multiple components. The gradient thickness profile adjusts the mechanical properties to achieve the desired isolation performance with relaxed installation tolerances.