In the fields of precision manufacturing and scientific research, mechanical vibration is like an "invisible killer", which can cause equipment performance degradation in mild cases and structural damage in severe cases. The core goal of mechanical vibration isolation and reduction technology is to decouple the equipment from the vibration source by blocking or attenuating the transmission path of vibration energy, thereby ensuring its stable operation.

The principle of mechanical vibration isolation and reduction involves interdisciplinary fields such as elastic mechanics, control theory, and materials science. Essentially, it utilizes the deformation energy storage of elastic components to counteract the energy of active systems, achieving efficient dissipation of vibration energy.

Passive mechanical vibration isolation and reduction principle: "low-frequency buffering" of elastic components

Passive vibration isolation relies on the low stiffness characteristics of elastic materials such as springs and rubber, which absorb vibration energy through deformation. When the vibration frequency of the equipment is higher than the natural frequency of the system, the deformation of the elastic element lags behind the excitation force, causing a significant attenuation of the force transmitted to the foundation.

The principle of mechanical vibration isolation can be simplified as a single degree of freedom mass spring damping system: when the ratio of excitation frequency to natural frequency (λ) is greater than √ 2, the isolation coefficient (η) is less than 1, and the vibration is effectively isolated.

For example, air springs are commonly used in building vibration isolation to isolate low-frequency oscillations of 0.5-5Hz. Their low stiffness design can extend the natural period of the system, increase the value of λ, and thus improve vibration isolation efficiency.

Principle of Active Mechanical Vibration Isolation and Reduction: "Dynamic Neutrality" of Closed loop Control

Active vibration isolation monitors vibration signals in real-time through sensors, and after analysis by control algorithms, drives actuators to generate reverse force, achieving "dynamic neutralization" of vibration. Its core is a closed-loop control system: sensors collect vibration displacement, velocity, or acceleration signals, the controller calculates the required reverse force based on preset algorithms, and the output force of actuators cancels out the vibration force.

For example, in the frequency range of 5-200Hz, the active system can generate precise reverse force for mid to high frequency vibrations, resulting in an isolation efficiency of over 90%, especially suitable for scenarios such as semiconductor lithography machines that require nanometer level alignment accuracy.

Hybrid mechanical vibration isolation and reduction principle: "full frequency coverage" of dual-mode fusion

The advantages of hybrid isolation combined with passive and active technologies are achieved by absorbing low-frequency vibrations through elastic elements and actively canceling out mid to high frequency interference in the active system.

The principle lies in the frequency division strategy: the low frequency band (<5Hz) is dominated by passive components (such as air springs), which use their large deformation ability to isolate building vibrations; The mid to high frequency range (5-200Hz) is taken over by the active system and dynamically compensated through real-time feedback control.

 This design can solve the frequency band limitations of a single isolation scheme, such as in electron microscopy imaging, which isolates building sway interference and eliminates transient impacts caused by personnel movement.

Product application: LVH-T15 heavy-duty active vibration isolation platform

Based on the mechanical isolation and vibration reduction principle mentioned above, LeadTop's LVH-T15 heavy-duty active isolation platform is specially designed for TEM/SEM, using electromagnetic actuators and four stage air spring composite technology to achieve vibration suppression of six degrees of freedom in the full frequency range of 1-200Hz.

 Its fourth level air spring can isolate low-frequency building sway from 0.5-5Hz, with a attenuation of more than 35dB at the 5Hz frequency point (corresponding to a 90% isolation efficiency).

Electromagnetic actuators are designed for high-frequency vibrations in the range of 5-200Hz, with a 30ms step disturbance suppression capability to ensure dynamic stability. The 500kg ultra large load-bearing capacity and online modal analysis function make it an ideal choice for electron microscopy imaging, semiconductor detection, and life science fields.