中文版本

Opportunity

Vibration is a pervasive issue in engineering systems, negatively impacting precision equipment accuracy, reducing instrument service life, and causing structural fatigue. Traditional solutions like linear passive vibration isolators, active/semi-active systems, and quasi-zero stiffness (QZS) isolators have limitations. Linear isolators struggle with low-frequency vibrations, while active systems require complex controllers and energy inputs. Typical QZS isolators often only suppress vibrations in a single direction (e.g., vertical), failing to address multi-directional vibrations common in high-precision manufacturing, aerospace, and transportation. There is a critical need for a compact, passive anti-vibration unit capable of ultra-low-frequency isolation across multiple directions (horizontal, vertical, rotational) without sacrificing loading capacity or stroke range.  

Technology

The patent introduces an innovative anti-vibration unit with an X-shaped support structure and strategically arranged resilient members (e.g., springs). Key innovations include:  

1. Multi-Directional Isolation: The unit passively suppresses vibrations in three directions (x, z, yaw) using a combination of X-shaped mechanisms and oblique springs, achieving quasi-zero stiffness (QZS) in all axes.  
2. Compact Design: Unlike traditional systems, it eliminates guiding sliders, reducing friction and enabling a more compact footprint. The X-shaped structure provides nonlinear stiffness (positive, zero, and negative) for enhanced performance.  
3. Tunable Parameters: Adjustable rod lengths (e.g., L1, L2), spring stiffness (k1), (k2), (k3), and assembly angles (θ1), (θ2) allow customization for specific loads and frequency ranges.  
4. Enhanced QZS Range: Achieves a wider QZS zone (73% of total stroke) compared to traditional isolators, with lower resonant frequencies (<0.5 hz)="" and="" reduced="" transmissibility="" peaks.="">

Advantages

• Passive Operation: No need for active control, reducing energy consumption and complexity.  
• Ultra-Low Frequency Isolation: Effective from 0.16 Hz, surpassing traditional isolators (typically >2 Hz).  
• High Loading Capacity: Maintains stability under significant static loads (e.g., 53.8 N at QZS point). Multi-Directional Suppression: Simultaneously isolates vibrations in horizontal, vertical, and rotational directions.  
• Compact and Scalable: Modular design allows combination of units for 1–6 degrees of freedom.  

Application

• Precision Equipment: Protects sensitive instruments in semiconductor manufacturing, microscopy, and laser systems.  
• Aerospace: Vibration isolation for satellite payloads (e.g., telescopes) from launch and orbital disturbances.  
• Transportation: Reduces low-frequency vibrations in vehicle seats (1–20 Hz) to improve driver comfort and cargo safety.  
• Medical Devices: Stabilizes neonatal incubators or surgical robots during transport.  
• Industrial Machinery: Minimizes vibrations in CNC machines and robotic arms.