The damping and vibration reduction design of electronic equipment is based on the working environment conditions of the instrument and equipment, some special requirements of itself and the possibility and reality of implementing these requirements. By making use of the relationship between the parameters of damping structure and each other, the main parameters are adjusted properly. The damping and damping design can be roughly summarized as follows:
1. Determine the type of structural damping and the damping form of the whole machine.
2. Determine the elastic element material of damping structure.
3. Determine the viscoelastic damping material.
4. Estimate and measure the dynamic characteristics of damping structure.
In modern electronic control equipment, the whole system is designed for structural damping, which is usually designed for hierarchical structure damping. This is mainly based on the characteristics of some modern electronic control equipment, such as small size, light weight, good air tightness, high reliability, complex and variable shape. The so-called hierarchical structure damping design treatment means that the structural damping design treatment is carried out for several key parts of the whole instrument, or the whole instrument is composed of several damping structural parts. Thus, the vibration response of each important part of electronic equipment is limited within the allowable range.
（1） The first stage damping system of the base plate of the rectangular damping structure
The design of the damping system is simple, economic, easy to operate and has good damping effect. It is suitable for the design of electronic control instruments with moderate protection requirements for broadband random vibration. The concrete method is: on a multi-layer damping structure base plate composed of three layers of Constrained Viscoelastic Damping material and four layers of aluminum alloy Mei. Install a cast aluminum structure instrument shell, and install important components such as printed circuit board in the shell. Since a damping structure bottom plate is added at the bottom, a considerable part of the vibration energy can be dissipated through it, so the resonance transmission rate of the basic vibration mode of the instrument with damping bottom plate can be reduced by 4-5 times compared with that without damping bottom plate.
（2） Multi-stage damping system of base plate of four ear damping structure
The design of multi-stage damping damping system is mainly characterized in that the maximum vibration transmission rate can be limited to about 2, and the working environment of the instrument can be improved to the greatest extent. The specific method of damping treatment of printed circuit board for electronic equipment is to paste a certain thickness of damping material on the non printed circuit surface of ordinary printed circuit board, and then paste a structural board with the same material as the base layer By comparing the vibration data of PCB before and after damping treatment, it can be clearly seen that the resonance frequency of PCB decreases from 400Hz to 220hz, and the resonance transmission rate decreases from 18 to 3.2, which provides an ideal working environment for electronic components and improves the damping effect of electronic equipment system.
（3） Integrated application system of structural damping and USS reduction
The comprehensive application of viscoelastic damper and shock absorber is also one of the effective methods to control vibration. It can also make the modern electronic equipment have the ability of highly controlling the vibration and impact in the whole frequency range of the excitation frequency, and provide a better working environment for the electronic equipment.
