Anti Vibration Technology - Machine House, Nashik - India Manufacturers of AVM - Anti Vibration Mounts 


 

Anti vibration mounts (avm) india

VIBRATION TECHNOLOGY  

 

Information on Vibration Technology

Today the reduction of vibration emission and vibration immission play an important part in the operation of plant and machinery, etc. The constant improvement in machine performance over recent years has generally been accompanied by increased speeds and cutting rates, as well as an increase in impact power in the field of forming. This means an increase in the vibrations transmitted to the surroundings, which must be efficiently controlled.

The basic principle of vibration isolation
The objective of using insulating mechanisms for machine mounting is the reduction of pulsating (repetitive), or sinusoidal vibrations. The task is to keep the motion (amplitude) of the flexibly mounted machine within permissible limits for operation. The vibration insulators selected must have sufficient dampening capacity!

 

Matching up the important factors

Insulation of sinusoidal vibrations The efficiency of vibration insulation depends to a large extent on the relationship between the machine speed/stroke rate and the natural vibration frequency of the insulator (matching ratio). In general, it can be said that the lower the natural vibration frequency of the insulator, i.e. the greater the ratio between forcing frequency and natural frequency, the greater the efficiency of the insulator. The diagram below shows that vibration insulation does not take effect until the
matching ratio ( η) is greater than √2.

 

 

Impact insulation
The physical properties of impacts are their duration, direction and magnitude. The object of impact insulation is to change the forcing frequency consisting of a high kick into an impulse of longer duration accompanied by small residual forces. Different from periodically excited vibrations, the system provided with springs vibrates in the

 

So, the efficiency factor of an impact insulation is: 


 

Types of Vibration Insulation
We differentiate between active and passive insulation. If the objective is to prevent spreading of the vibrations caused by a machine (vibration emission), we talk of active insulation. If, on the other hand, precision

Important Definitions
Damping
= the physical property of an insulator to limit resonance vibration to the permissible level. During this process, mechanical energy is converted into heat.
Isolation = insulating of an actuating force.


The basic principle of vibration isolation
The objective of using insulating devices for machine mounting is the reduction of pulsating (repetitive), or sinusoidal vibrations. The task is to keep the motion (amplitude) of the flexibly mounted machine within permissible limits for operation. The vibration insulators selected must have sufficient dampening capacity!

 

No insulating effect can be expected at frequency ratios of less than √2. Quite the opposite: an increase in (excessive) vibration must be anticipated. As a rule a matching ratio ( η) between 3 4 is attempted, with 3 being taken as the technical minimum and 4 the economic maximum. A bigger matching ratio (η ) than 4 cannot be justified for economic reasons, as the material expense would increase out of proportion to the insulating effect. excited natural frequency of the insulated system, not according to its number of strokes. The residual forces transferred via the insulators become increasingly smaller, the longer the natural vibration period lasts and therefore the smaller the natural frequency of the system sitting on a foundation equipped with springs. Machining equipment which is extremely sensitive to vibrations is to be protected from vibration immission, this is described as passive insulation.
 

 ηb = natural frequency of the system rigidly secured to the ground
 ηe = natural frequency of the system when placed on insulators containing springs


Vibration emission = vibration created by the machinery that is propagated to the surroundings.
Vibration immission = vibration present in the surroundings that is propagated to the machinery.

 

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