An air spring is actually a spring that can take advantage of the elasticity of compressed air. Most of the devices are used in automotive shock absorbers. Installation will reduce vibration, so that people feel more comfortable.
In fact, the elastic coefficient of air spring does not have a certain value, and its elastic washing degree can be adjusted. Not only that, but the springs generally don't cause any resonance. This is the key reason why the device is used in automotive suspension systems.
And because, at a certain temperature, if the volume of a gas is compressed, the internal elastic force of the gas increases exponentially, that is, the elastic force increases. It is also because of this feature, the air spring has brought more benefits to people. Cars with air springs are comfortable to drive and ride. With large compression and tensile tension.
In addition, there is an adjustable air spring. The design principle of this is quite complicated, so it's not used much.
Air springs are used not only in the shock absorbers of cars, but also to minimize the shock felt by the occupants. Not only that, but now even China's EMUS use air springs to provide great comfort and reduce vibration.