What is Positive Vibration Isolation? What is Negative Vibration Isolation

The so-called vibration isolation is to isolate the vibration source from the object that needs to be isolated with elastic elements and damping elements, so that most of the milk generated by the vibration source is absorbed by the vibration isolation device to reduce the interference of the vibration source to the equipment.

Vibration isolation can be divided into two categories: one isolates the vibration source from the foundation to prevent or reduce the propagation of the vibration source to the surroundings, which is called active vibration isolation or is called positive vibration isolation, and the other isolates the object that needs vibration isolation from the vibration source to prevent or reduce the impact of surrounding vibrations on the object, which is called passive vibration isolation or is called negative vibration isolation.

According to the different vibration isolation objects, it can be divided into two categories: active vibration isolation and passive vibration isolation, and the active vibration isolation and passive vibration isolation are separated by the application of secondary force sources.

Negative vibration isolation - between the vibration machine and the foundation to install elastic support such as vibration isolator, reduce the amount of machine vibration disturbance to the foundation, so that the vibration of the machine can be effectively isolated, this vibration isolation measures for the machine generated by vibration disturbance are called positive vibration isolation, sometimes also called active vibration isolation. In general, the vibration isolation of fans, pumps, compressors, punches, and subway tracks is actively isolated.

Negative vibration isolation - between the instrument and equipment and the foundation to install elastic support such as vibration isolator, in order to reduce the impact of the vibration of the foundation on the instrument and equipment, so that the instrument and equipment can work normally or not be damaged, this installation of the instrument and equipment to take isolation measures called negative vibration isolation, sometimes also called passive vibration isolation. Under normal circumstances, the vibration isolation of instruments and precision equipment is negative vibration isolation, and the installation of vibration isolators under the house to prevent damage is also of this nature.

Positive vibration isolation is a method of eliminating or reducing vibration propagation.

Vibration transmissibility: The force transmitted to the foundation is a few percent of the excitation force. If the object is directly fixed (rigidly fixed) on the foundation, then the excitation force is fully transmitted to the foundation, and the vibration transmission rate is 1.

Therefore, only when the vibration transmissivity is less than 1 can there be a vibration isolation effect.

The actual meaning of vibration isolation efficiency is that the excitation force is isolated by a few percent. Vibration transmissibility ta and vibration isolation efficiency are usually expressed as percentages, and the concept of vibration transmissibility is used more in vibration science, because the vibration transmissibility curve very vividly illustrates the relationship between the degree of vibration isolation of the system and certain parameters.

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Vibration reduction is the main means of preventing vibration hazards in engineering. Vibration damping can be divided into active and passive damping. Active vibration damping is to consider the elimination of the vibration source or reduce the energy or frequency of the vibration source in the design, and is more used in precision instruments, aerospace equipment, large steam turbine generator sets and high-speed rotating machinery, but the cost is expensive, and the application in ordinary construction machinery is less.

Passive vibration reduction includes vibration isolation and vibration absorption. Vibration isolation can be divided into active vibration isolation and passive vibration isolation.

In order to prevent or limit the hazards and effects of vibration, various measures are adopted in modern engineering, which can be summarized as follows:

1 Weaken or eliminate the vibration source (active vibration absorption) 2 Stay away from the vibration source (passive vibration isolation) 3 Improve the vibration resistance of the machine itself (active vibration reduction) 4 Avoid the resonance area 5 Appropriately increase damping (damping vibration absorption) 6 Power vibration absorption (passive vibration absorption) 7 Take vibration isolation measures.

1. Negative vibration reduction refers to preventing or reducing the vibration impact of external vibration on the vibration reduction system.

2. Active vibration reduction refers to preventing or reducing the impact of the vibration of the supported body series on the external vibration.

Weaken or eliminate vibration sources (active damping).

This is a positive response to the root causes. If the cause of vibration is caused by the eccentricity of the rotating parts, the centrifugal inertia force of the unbalance can be reduced by improving the accuracy of dynamic balancing. For reciprocating machinery, such as air compressors, it is also necessary to pay attention to the balance of inertial forces.

Keep away from the source of vibration (passive isolation).

This is a negative protective measure. For example, precision instruments or equipment should be kept as far away as possible from factories or workshops with large power machinery, pressure processing machinery and vibration machinery, as well as busy railways and highways.

Positive: If the cause of vibration is caused by the eccentricity of the rotating parts, the unbalanced centrifugal inertia force can be reduced by improving the accuracy of dynamic balancing. For reciprocating machinery, such as air compressors, it is also necessary to pay attention to the balance of inertial forces.

Negative: For example, precision instruments or equipment should be kept as far away as possible from factories or workshops with large power machinery, pressure processing machinery and vibration machinery, as well as busy railways and highways.

Relieve your stress in a positive and positive way, and reduce your stress in a negative way.

As the name suggests, being positive is being proactive. To be negative is to be passive.

Positive is to take the initiative to go, and negative is to go passively.

It depends on your perspective on things, some people choose a positive attitude when doing things, and some people choose to be negative.

One is good and one is bad.

It is good vibration isolation material and bad vibration isolation material.

It's just that I think it's painful to find them annoying.

1. Maintain discipline in class and do not speak.

The difference between a hard landing and a soft landing

The return to Qiqing is called vibration isolation, that is, the vibration source and the object that needs to be isolated with elastic elements and damping elements to isolate, so that part of the milk volume of the vibrating source is absorbed by the vibration isolation device, so as to reduce the interference of the vibration source to the equipment.

Vibration isolation can be divided into two categories: one isolates the vibration source from the foundation to prevent or reduce the propagation of the vibration source to the surroundings, which is called active vibration isolation or is called positive vibration isolation, and the other isolates the object that needs vibration isolation from the vibration source to prevent or reduce the impact of surrounding vibrations on the object, which is called passive vibration isolation or is called negative vibration isolation.

a.Active vibration isolation.

b.Damped vibration isolation.

c.Negative vibration isolation.

d.Passing the spine diaphragm signal to the limb vibration.

Correct slippery answer: AC