Yingtai: Principles of Active Vibration Damping Technology in Centrifuges

Yingtai: Principles of Active Vibration Damping Technology in Centrifuges

I. Core Principles of Active Vibration Damping  

Active vibration damping technology optimizes the system's dynamic design and actively controls the transmission of vibrational energy to achieve vibration suppression during centrifuge operation. Its core objective is to keep the centrifuge's operating speed away from the critical speed of the rotating system while absorbing or isolating vibrational energy through structural design.

II. Key Technical Implementation Paths  

1. Critical Speed Avoidance Design Principle:  

   The critical speed is a dangerous state where the natural frequency of the rotor system coincides with the rotational frequency, causing a sharp increase in vibration amplitude. Active vibration damping avoids this by optimizing rotor dynamic balance and adjusting stiffness, setting the operating speed to at least 1.3 times the critical speed.  

   Example: A high-speed centrifuge in a laboratory (20,000 rpm) determined its critical speed to be 15,000 rpm through finite element analysis. A safety margin was incorporated into the design to avoid resonance.

2. Flexible Connection Structure for Spindle Bearing Housing:  

   Rubber-metal composite bushings are used to allow micron-level elastic deformation (deflection ≤50 μm) of the spindle in the radial direction, absorbing high-frequency vibrations.  

   Motor-Spindle Connection: Elastic couplings (e.g., diaphragm couplings) are employed to compensate for axial/radial misalignment and reduce torque fluctuation transmission.  

   Drive System and Frame: Multi-directional damping supports are installed, reducing the overall machine's vibration acceleration from 5g to below 0.8g.

3. Material and Damping Optimization:  

   - Rubber Dampers: Hardness is controlled within Shore A 60-80, with a critical speed adjustment range of ±15%, while ensuring tensile strength ≥8 MPa.  

   - Silicone Rubber Interlayer: A 0.5mm thick silicone layer is added between the rotor and spindle, improving vibration attenuation by 40%.