catalogue search
P. 01
P. 02
P. 03
P. 04
P. 05
P. 06
P. 07
P. 08
P. 09
P. 10
P. 11
P. 12
P. 13
P. 14
P. 15
P. 16
P. 17
P. 18
P. 19
P. 20
P. 21
P. 22
P. 23
P. 24
P. 25
P. 26
P. 27
P. 28
P. 29
P. 30
P. 31
P. 32
P. 33
P. 34
P. 35
P. 36
P. 37
P. 38
P. 39
P. 40
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
You may also be interested in
Platform, Glass fiber, Rigid coupling, Bushing, Anti-vibration mount
Text version of the page
| \№BREEKA V ^ VIBRATION Ä SHOCK CONTROL Introduction | |||||||||||||||||||||||||||||||||||||||
| Vibrating, rotating, reciprocating and impacting equipment create machine-induced vibration and/or shock, which is transmitted into their support systems. Rotating machines and equipment that are not properly balanced produce centrifugal forces creating steady state and random vibration. Machines generating pulses or impacts, such as forging presses, injection molding, impact testers, hammers, centrifugal pumps and compressors are the most predominate sources of vibration and shock. | |||||||||||||||||||||||||||||||||||||||
| If the equipment requiring isolation is the source of unwanted vibration (Figure 1), the purpose of isolation is to reduce the vibration transmitted from the source to its support structure. This vibration producing equipment consists mainly of machines that apply severe dynamic forces in their supporting structures. Conversely, if the equipment requiring isolation is the recipient of unwanted vibration (Figure 2), the purpose of isolation is to reduce the vibration transmitted from the support structure to the recipient to maintain performance. This includes equipment such as precision machine tools and measuring machines where vibrations must be kept within acceptable limits to achieve the desired surface finish, tolerances or accuracies. Depending on the circumstances, it should be noted that a machine could be both a source and recipient of unwanted vibration. For example, a surface grinder is generally a vibration-sensitive piece of equipment that needs to be protected from floor vibrations. However, as the surface grinder reverses its heavy table during operation, it produces a large dynamic force, which may disturb other nearby precision equipment. Some machine tools of ordinary precision are neither sensitive to vibration nor produce large dynamic forces, and therefore may or may not require isolation. Operating frequencies of rotating/reciprocating machines often are very close to the natural frequency of their support structure (floor slab and soil). Compressors, for example, can generate vibration of substantial magnitudes at low frequencies that coincide with the natural frequency of the floor slab, thus creating a resonance (amplification of vibration) in the floor. | |||||||||||||||||||||||||||||||||||||||
| In order to achieve acceptable amplitudes of vibration at the source or recipient, it becomes necessary to make the support structure independent (isolated) from the rest of the environment. This separation prevents vibration from being transmitted directly through the support structure. | |||||||||||||||||||||||||||||||||||||||
| F(t) | |||||||||||||||||||||||||||||||||||||||
| ISOLATOR 1 | |||||||||||||||||||||||||||||||||||||||
| SUPPORT STRUCTURE ,. • Figure 1 | |||||||||||||||||||||||||||||||||||||||
| ▼ | F'{t) | ||||||||||||||||||||||||||||||||||||||
| u | |||||||||||||||||||||||||||||||||||||||
| X(t) | |||||||||||||||||||||||||||||||||||||||
| MACHINE | |||||||||||||||||||||||||||||||||||||||
| L— FOUNDATION | |||||||||||||||||||||||||||||||||||||||
| aft) | |||||||||||||||||||||||||||||||||||||||
| ISOLATOR I | |||||||||||||||||||||||||||||||||||||||
| SUPPORT STRUCTURE | |||||||||||||||||||||||||||||||||||||||
| Figure 2 | |||||||||||||||||||||||||||||||||||||||
| T | |||||||||||||||||||||||||||||||||||||||
| F(t) | |||||||||||||||||||||||||||||||||||||||