Opportunity
Vibration is a pervasive and detrimental issue in numerous engineering systems, adversely affecting the precision of sensitive equipment, accelerating structural fatigue, and reducing the operational lifespan of instruments. Traditional vibration suppression methods, including linear passive isolators, active or semi-active isolation components, and nonlinear quasi-zero stiffness (QZS) passive isolators, have been employed to mitigate these effects. However, these conventional systems often exhibit limitations in performance, particularly in their ability to adaptively respond to varying vibration amplitudes and frequencies. They may struggle to provide sufficient isolation across a broad range of excitation conditions, especially under larger amplitude vibrations where performance can degrade. There exists a significant opportunity to develop a more effective vibration isolation system that can dynamically adapt its inertial properties to enhance damping and isolation performance across diverse operational scenarios, from precision satellite instrumentation to vehicle suspensions and industrial machinery.
Technology
This patent discloses an innovative anti-vibration system that utilizes a configurable nonlinear inertia mechanism to significantly improve vibration isolation. The core innovation lies in an inertial structure comprising a central support member (e.g., a third support member) rotatably connected at a central joint to an X-shaped or similar support framework formed by other interconnected support members. Crucially, this central member has adjustable counterweight components attached at its ends. As the system compresses and decompresses in response to external vibrations, the entire inertial structure rotates around the central joint. This rotation causes the counterweights to move, generating inertial forces. When the direction of the counterweights' motion is forced to change by the linked support members, these inertial forces must be overcome, creating a nonlinear inertial effect. This effect causes the system's equivalent mass or inertia to vary adaptively—increasing or decreasing nonlinearly in response to the input vibration excitation. Since a larger equivalent mass is beneficial for isolation, this adaptive nonlinear inertia dramatically enhances vibration suppression performance. Furthermore, the system is highly tunable. By adjusting parameters such as the distance between rotational joints (e.g., modifying the length ratio between the central member and connected linkages), the type of nonlinear inertia produced—such as High Compression-Low Extension (HCLE), Low Compression-High Extension (LCHE), or High Compression-High Extension (HCHE)—can be selectively configured to suit specific application requirements.
Advantages
- Introduces a novel, tunable nonlinear inertia mechanism that adaptively enhances vibration isolation.
- Achieves superior isolation performance, especially under larger excitation amplitudes, with reduced resonance peaks and frequencies.
- The generated nonlinear inertial forces often counteract equivalent stiffness forces, which are a primary source of interactive force fluctuation, leading to more stable vibration control.
- Offers high configurability; system parameters (e.g., link lengths, spring stiffness, initial assembly angle) can be adjusted to meet diverse application needs regarding payload, frequency range, and displacement.
- Demonstrates improved nonlinear inertia and damping characteristics compared to systems without the inertial structure, as validated by prototype testing.
- The fluctuation of nonlinear spring and damping forces within the system is significantly lower than in linear systems.
Applications
- Precision equipment in remote sensing satellites and aerospace systems.
- Seat suspension systems in aircraft, automobiles, and other vehicles.
- Vibration isolation for sensitive medical equipment or during the transport of fragile cargo.
- General industrial machinery and structural applications where vibration control is critical.
- Suspension systems for vehicles to improve ride comfort and stability.
