The natural frequency is one of the important evaluation objects and characteristic parameters of the air spring vibration isolation platform. Although the stiffness of the air spring vibration isolation platform changes with the load, the natural frequency of the vibration isolation platform is almost unchanged under different loads. However, the air spring vibration isolation platform supported by a plurality of air spring elements is complicated in operation, and the existing dynamic model has certain defects. The test method is widely used in engineering to study the natural frequency of the air spring vibration isolation component or system. Most of the other characteristic parameters are also subject to actual measurement, but the problem is that the degree of agreement between the measured and theoretical values ​​cannot be accurately known.
The vibration system is identified, the existing dynamic model is improved, the natural frequency of the system is calculated, the vibration test is designed and tested, and the vibration isolation effect is analyzed, which provides a theoretical basis for the improved vibration isolation system of the future research group. Mathematical model of a single air spring The air spring is a very complicated non-metallic spring that is filled with compressed air in a flexible closed container (rubber airbag) and elasticized by the compressibility of air. The air spring body and auxiliary air are used. Room composition.
The study of the natural frequency of the precision air spring vibration isolation platform is a balloon made of rubber bladder, the volume of which can be changed, the latter volume is constant, and an orifice is provided between the two, and the air spring body can pass through the orifice The additional air chamber is connected. Used to isolate the disturbance of the foundation. An optical nanometer measurement platform is placed thereon, and the system can complete the nanometer gas static pressure rail test and the optical interferometer optical test. The vibration isolation platform of the air spring precision vibration isolation system is a T-shaped structure, which is the simplest type of the vibration isolation platform, namely a square body and a four-point support. The hardware facilities of each support point are identical, and are all stored. The gas tank and the air spring are composed, and each air spring and the air tank have the same model. The four supporting facilities are symmetrically distributed with the main inertia axis of the air spring precision vibration isolation platform as the axis of symmetry, which can effectively prevent the deflection of the platform caused by the stiffness of the air spring and the different deflections or uneven forces of the points.
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