How is vibration isolated and controlled?
Vibration problems are solved by considering the system as a number of springs and masses with damping. It is sometimes possible to reduce the problem to a single mass supported by a spring and a damper. If the vibration is produced by a motor inside a machine, it is usually desirable to ensure that the frequency of motor oscillations (the forcing frequency) is well above the frequency of the natural resonance of the machine on its support. This is achieved by altering the mass or stiffness of the system as appropriate. The method of vibration isolation is very easy to demonstrate with a weight held from a rubber band. As the band is moved up and down very slowly the suspended weight will move by the same amount. At resonance the weight will move much more, but as the frequency is increased still further the weight will become almost stationary. In practical circumstances springs are more likely to be used in compression than tension, but the principles are exactly the same. A further
Vibration problems are solved by considering the system as a number of connected springs and masses with damping. The vibration source is included within, e.g. the engine of a motor car, or the environment on which this assembly is mounted is presumed to vibrate, e.g. a scanning electron microscope. If the vibration is produced by a motor inside a machine, it is necessary that the natural frequency of the supporting system is well below frequency of motor oscillations (the forcing frequency). This is achieved by altering the mass or stiffness of the system as appropriate. The method of vibration isolation is demonstrated with a weight held from a rubber band. If the band is moved up and down very slowly the suspended weight will move by the same amount. At resonance the weight will move much more and possibly in the opposite direction. But as the frequency of vertical movement is further increased, the weight will become almost stationary. Springs are more often used in compression tha
