In order to effectively suppress the hazards of vibration and noise, vibration control technology has been widely studied and applied. The so-called vibration control is to take measures in the design or installation to control the vibration of the equipment and the system, and to control the vibration intensity of the equipment and the system within the allowable range. An object that generates an exciting force is called a vibration source body, and an object that requires a reduction in vibration intensity is called a vibration damping body. According to the vibration control mechanism, the vibration control methods can be divided into the following three categories:
(1) Vibration reduction
A control method that attenuates system vibration by consuming vibration energy of a vibration source body is called vibration reduction. For example, when setting a car tire, the influence of the balance quality should be fully considered to reduce the exciting force caused by the unbalanced mass. Reduce diesel engine vibration by improving fuel injection parameters, improving fuel quality, increasing pressurization and intercooling. There is also a reduction in the windward area of the bridge and the building structure to reduce the wind resistance of the building to suppress the occurrence of vibration. These are all examples of the application of vibration reduction technology in reality
(2) Vibration isolation
The control method of weakening the vibration of the system by controlling the transmission of vibration is called vibration isolation. That is, the vibration isolation device is added between the vibration source body and the vibration damping body to reduce the influence of vibration on the vibration damping body. The vibration isolator commonly used in actual engineering practice includes metal spring isolator, wire rope shock mounts
, rubber isolator, air spring isolator, hydraulic damper, gas-liquid combination damper, and the like.
(3) Vibration reduction (or vibration absorption)
The control method of weakening the vibration of the system by transferring the energy of the vibration system is called vibration damping or vibration absorption. That is, a vibration damper is attached to the excitation body. By relying on the interaction between the vibration damper and the vibration damper, the energy of the vibration system is absorbed, thereby reducing the vibration strength of the vibration damper. For example, a highly damped vibration absorbing material or the like installed on the pipe wall.