Vibration Isolation
Principle of Vibration Isolation
Active vibration control prevents the transmission of periodic, shock type or random forces from machines to the surroundings (source isolation). Passive vibration control protects sensitive equipment against vibrations from outside sources (receiver isolation). In both cases, the machinery or sensitive equipment are elastically supported by special spring elements or other elastic supports. This generates an oscillatory system defined by the mass of the machine - sometimes with an additional foundation - and the elasticity of the supporting elements. The properties of this system may be influenced by inserting damping.
For the proper design of an isolation system it is usually sufficient to consider the machine and its foundation as one rigid mass. Such a system has six degrees of freedom and six natural eigenfrequencies all of which have to be considered when selecting the proper support elements. The design of the support system must also account for the permissible dynamic deflections of the elastically supported machine or equipment. To limit these deflections sometimes an additional mass in the form of a foundation block or steel plate might be required.
Active vibration control prevents the transmission of periodic, shock type or random forces from machines to the surroundings (source isolation). Passive vibration control protects sensitive equipment against vibrations from outside sources (receiver isolation). In both cases, the machinery or sensitive equipment are elastically supported by special spring elements or other elastic supports. This generates an oscillatory system defined by the mass of the machine - sometimes with an additional foundation - and the elasticity of the supporting elements. The properties of this system may be influenced by inserting damping.
For the proper design of an isolation system it is usually sufficient to consider the machine and its foundation as one rigid mass. Such a system has six degrees of freedom and six natural eigenfrequencies all of which have to be considered when selecting the proper support elements. The design of the support system must also account for the permissible dynamic deflections of the elastically supported machine or equipment. To limit these deflections sometimes an additional mass in the form of a foundation block or steel plate might be required.
The lower the natural frequency, in other words, the higher the quotient of exciting to natural frequency, the higher is the isolation efficiency of the support system.
GERB can provide the design of foundation systems and the accurate selection of spring and damping elements based on the required isolation efficiency and acceptable movement for any specific application. The design consists of the static and dynamic analysis of the elastically supported system, layout and reinforcement drawings of foundation block and pit as well as installation and maintenance instructions.
GERB can provide the design of foundation systems and the accurate selection of spring and damping elements based on the required isolation efficiency and acceptable movement for any specific application. The design consists of the static and dynamic analysis of the elastically supported system, layout and reinforcement drawings of foundation block and pit as well as installation and maintenance instructions.
GERB spring elements consists of helical compression springs, which provide ideal linear elastic behavior and sustained durability. Where necessary spring elements are combined with VISCODAMPERS® to supply damping to the system. Properly designed these system provide the highest degree of isolation not only for harmonic excitations but also for impact loads and structure borne noise.
