Dynamic vibration absorption (passive vibration absorption)įor measuring or monitoring instruments on some equipment, the method of installing dynamic vibration absorber under the instrument can stabilize the pointer of the instrument and improve the measurement accuracy. It can restrain the amplitude of the forced vibration, especially in the resonance region.Ħ. Increase damping appropriately (damping and vibration absorption)ĭamping absorbs the vibration energy of the system and makes the amplitude of the free vibration attenuate rapidly. The larger the dynamic stiffness, the smaller the vibration of the machine structure under the dynamic force.Ĭhange the natural frequency of the system (active damper) or the working speed of the machine (passive damper) as much as possible according to the actual situation, so that the machine does not work in the resonance area.ĥ. The commonly used index to measure the anti-vibration ability of the machine structure is the dynamic stiffness, which is equal to the dynamic force required by the unit amplitude of the machine structure. Improve the anti-vibration ability of the machine itself (active shock absorber) For example, precision instruments or equipment should be as far away as possible from factories or workshops with large power machinery, pressure processing machinery and vibration machinery, as well as railways and highways with busy transportation.ģ. Keep away from a vibration source (passive vibration isolator) For reciprocating machinery such as air compressor, attention should also be paid to the balance of inertia force.Ģ. If the vibration is caused by the eccentricity of the rotating parts, the unbalanced centrifugal inertia force can be reduced by improving the dynamic balance accuracy. Reduce or eliminate the vibration source (active shock absorber) In order to prevent or limit the harm and influence caused by vibration, various measures are adopted in modern engineeringġ. The isolator can be divided into active isolator and passive isolator. Passive shock absorbers include vibration isolators and absorbers. It is widely used in precision instruments, aerospace equipment, large steam turbine generator units and high-speed rotating machinery, but it is expensive and less used in common construction machinery. The active vibration damper is designed to eliminate the vibration source or reduce the energy or frequency of the vibration source. The shock absorber can be divided into active shock absorber and passive shock absorber. Difference and concept between shock absorber and vibration isolatorĪ shock absorber is the main means to prevent vibration hazards in engineering.
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