Vibration, as a form of mechanical wave propagation, can induce micro-displacements or resonances in precision instruments through structural conduction. In laboratory settings, building floor vibrations (0.5-50Hz) and equipment self-vibrations (50-200Hz) constitute dual interference sources: a vibration displacement of 0.1mm can lead to excessive phase errors in optical interferometers, while low-frequency vibrations between 1-5Hz can cause microscope stage drift, directly affecting the clarity of cell imaging.
The core objective of vibration isolation is to construct an "energy attenuation barrier", which essentially aims to break the transmission chain of vibrations from the environment to the instrument. Traditional solutions, such as passive vibration isolation methods like rubber pads and air springs, struggle to cover full-band interference due to the frequency-dependent nature of material damping.
For instance, rubber tends to creep below 10Hz, while air springs experience a sharp drop in vibration isolation efficiency at high frequencies due to the compressibility of gas. This has compelled the industry to explore more efficient composite vibration isolation technologies.
The efficiency of passive vibration isolation depends on the damping characteristics of materials and structural design. Elastic materials (such as rubber and metal springs) absorb energy through deformation, but they suffer from the "low-frequency failure" issue: when the vibration frequency approaches the natural frequency of the material, the vibration isolation system may actually amplify the vibration (resonance phenomenon).
One of the breakthrough directions in the industry is the gradient damping structure: by combining multiple layers of materials with different stiffnesses, a frequency-band-specific attenuation mechanism is formed.
For example, the upper layer uses a rigid aluminum plate to transmit equipment loads, the middle layer is equipped with a honeycomb-like aluminum buffer layer (with hexagonal cells forming a three-dimensional elastic network) to attenuate mid-frequency vibrations, and the lower layer employs a soft rubber layer to absorb residual high-frequency vibrations.
Actual measurement data shows that this structure achieves a vibration isolation efficiency of 80% at 5Hz, which is 35% higher than that of single-material vibration isolation, covering the full frequency range of 0.5-200Hz.
Another innovation lies in the nonlinear damping design: leveraging the change in energy dissipation characteristics of materials during deformation to enhance low-frequency vibration isolation performance.
For instance, certain composite materials exhibit high damping (rapid vibration attenuation) during minor deformation and revert to low damping (preventing rigid overload) during significant deformation. This "intelligent response" characteristic boosts the efficiency of passive vibration isolation tables by 20% within the 1-10Hz frequency band.
The limitation of passive vibration isolation lies in its inability to cope with sudden vibrations or low-frequency disturbances (such as 1-5Hz vibrations caused by personnel movement). Active vibration isolation achieves "zero steady-state error" control through real-time monitoring and inverse compensation. Its technical chain consists of three links:
Actual measurements conducted by a national laboratory show that the active vibration isolation system achieves a vibration isolation efficiency of 95% at 10Hz, which is three times higher than that of passive vibration isolation. It is particularly suitable for scenarios where vibration sensitivity reaches the nanometer level, such as quantum computing and laser interferometers.
Precision instruments exhibit directional differences in vibration sensitivity: optical platforms require special attention to suppress vertical vibration, while atomic force microscopes are more sensitive to horizontal vibration. Six-degree-of-freedom vibration isolation necessitates simultaneous control of the three translational degrees of freedom (X/Y/Z) and rotational degrees of freedom around axes, to prevent coupled vibrations in other directions due to excessive suppression in a single direction.
The solution lies in the distributed actuator layout: 12 electromagnetic actuators are installed in an orthogonal distribution, with each actuator independently controlling the vibration of one degree of freedom.
For instance, when rotational vibration around the Z axis is detected, the system simultaneously adjusts the output force of the diagonal actuators to form a torque counteraction. Coupled with the dynamic leveling function (achieving a levelness adjustment of ±0.01° within 30 seconds), it ensures that the equipment quickly recovers to a stable state after movement or load changes.
In the field of quantum technology, the 0.5Hz low-frequency cutoff characteristic of TA400 can shield building vibrations, and its 95%@10Hz high-frequency vibration isolation efficiency ensures that the coherence time of superconducting qubits is increased from 10μs to 25μs, with key indicators reaching the international advanced level.
In industrial inspection scenarios, its 100kg load capacity and modular design are compatible with heavy-duty equipment such as laser trackers and coordinate measuring machines.
As a supplier of vibration isolation optical platforms, LeadTop deeply integrates material science, control theory, and engineering practice to provide protection solutions from "vibration source to instrument" for precision manufacturing, basic scientific research, and other fields, promoting the evolution of vibration isolation technology towards higher frequency bands and lower energy consumption.
