What Are the Types of Vibration Isolators? A Complete Guide to Selection

In the fields of precision experiments and high-end manufacturing, vibration is the “invisible killer” that affects equipment accuracy. Whether it is nanoscale observation under an electron microscope or micrometer-level measurement with a laser interferometer, even minor ground vibrations can lead to data distortion or even experiment failure. This is where vibration isolators become indispensable “shock absorbing guardians.” Faced with the wide variety of vibration isolator types on the market, many engineers and procurement personnel often feel confused: what types are available? Which scenarios are they suited for? This article systematically reviews common vibration isolator types from principles to applications, helping you make informed choices.

1. Passive Vibration Isolators: Simple and Reliable Basic Options

Passive vibration isolators are the most common type of vibration isolators. They do not rely on external energy sources and mainly use the elasticity or damping properties of materials to absorb vibration energy. The core principle is to convert vibration energy into heat or other forms of energy for dissipation. Passive vibration isolators mainly include two branches: rubber isolators and spring isolators.

Rubber vibration isolators can be further divided into various structures. Solid rubber isolators, for example, use a composite rubber structure that effectively isolates mid-to-high frequency vibrations, with particularly strong horizontal isolation performance. These isolators are structurally stable, easy to install, and can be precisely leveled with adjustable mounting bases. Wheels can also be added for mobility. A typical product like the POT-P series has a vertical natural frequency of 6.5–12 Hz, horizontal natural frequency of 3–8 Hz, load capacity of 180–800 kg per unit, and recovery time under 5 seconds, making it ideal for microscopes, medical and biological equipment, and other applications with moderate vibration requirements.

Hollow conical rubber isolators represent another optimized design. The POT-G series, for instance, combines advanced rubber materials with a special conical structure to provide higher damping while shortening recovery time and effectively reducing resonance risk. Its natural frequency can be as low as 4–8 Hz with a load range of 50–700 kg, making it suitable for precision scenarios such as microscopy and optical manufacturing.

2. Pneumatic Vibration Isolators: Efficient Solutions for Ultra-Low Frequency Vibrations

When passive vibration isolators cannot meet higher precision requirements, pneumatic vibration isolators become the ideal choice. Pneumatic isolators use compressed air to form an elastic support layer within air bags, “floating” equipment above the ground to achieve extremely low natural frequency isolation.

Pendulum-type pneumatic isolators are a representative product in pneumatic isolation technology. The ZDT-B series, for example, uses an ultra-thin composite air bag combined with a pendulum principle structure. An external adjustable damper further reduces resonance risk while enabling automatic leveling and quiet operation. The optimized pendulum design achieves a horizontal natural frequency as low as 1.0–1.5 Hz and a vertical natural frequency of 1.0–2.0 Hz. At 5 Hz, vertical and horizontal isolation efficiencies reach 86–92% and 88–94% respectively. This level of performance makes it ideal for microscopes, laser interferometers, and other equipment with extremely high vibration sensitivity.

While pneumatic vibration isolators excel in ultra-low frequency isolation, they require a compressed air supply system, so site conditions and cost factors should be considered during selection. Domestic suppliers such as LeadTop, a professional provider of vibration isolation optical platforms and accessories, offer complete solutions from pneumatic platforms to supporting accessories.

3. Active Vibration Isolators: The Future of Intelligent Isolation

Active vibration isolators represent the most advanced type of vibration isolation technology. They use sensors to monitor vibration signals in real time, a control system that rapidly calculates compensatory forces, and actuators that generate opposing forces to cancel out vibrations — achieving “vibration against vibration.” The greatest advantage of active isolators is their ability to effectively compensate for low-frequency vibrations (1–10 Hz), an area where passive and pneumatic isolators struggle.

Active vibration isolators typically feature six-degree-of-freedom active compensation, isolation bandwidth covering 1–200 Hz, and response times as short as 20 milliseconds. Some high-end products also support RS232 and EtherCAT communication interfaces for integration with host computer systems, enabling remote monitoring and intelligent control.

4. How to Choose the Right Vibration Isolator Type for Your Needs

Choosing the right vibration isolator type requires综合考虑 (comprehensive consideration) of several factors: first, the vibration frequency range — mid-to-high frequency calls for rubber isolators, low frequency for pneumatic isolators, and ultra-low frequency for active isolators; second, the load weight — different isolator types have varying load capacities; third, precision requirements — higher precision demands stricter isolation performance; and finally, budget, site conditions, and maintenance costs.

In summary, there is no absolute “best” vibration isolator type — only the “most suitable” one. Understanding the principles and characteristics of each vibration isolator type and making scientific judgments based on actual application scenarios will help you find the optimal vibration solution for precision equipment. If you have any questions during the selection process, we recommend consulting a professional vibration isolation optical platform and accessories supplier for targeted technical support.