What types of machinery are most likely to require isolators? Shears, presses and forges are examples of machines that are most likely to have shock control as their main issue as opposed to vibration control thanks to their rotational speeds of 250 revolutions per minute or more. That is because these particular pieces of equipment exert a substantial amount of energy with each stroke.
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Naïve equipment operators might be tempted to believe that shock control and vibration control are one in the same and can be accomplished together, but they are actually two very different aims. Whereas vibration disturbance is a steady state process, shock disturbance is not. Rubber isolators that control shock work by absorbing and storing the shock emitted by the machinery. One specific product, the shock mount, works by transforming the sudden shock they are exposed to by the equipment into a smaller force that is gradually applied.
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Mechanical engineers define shock isolation or shock control as the use of an isolating device (like a rubber isolator or shock mount) to reduce the impact of shock on a mechanism (such as a piece of machinery or equipment). The excess energy exerted by these mechanisms is absorbed by the isolator, decreasing the harmful effects that are placed on them.
What happens during the absorptive phase is that the energy that is collected by the rubber isolator is released at a much slower rate than that at which it was absorbed. To accomplish this aim, the shock control isolator performs four steps: 1) deflection of the shock; 2) amassing the impact; 3) storage of the shock; and finally 4) discharge of the shock according to its natural frequency design.
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Why is rubber a material of choice in the manufacture of shock control products like isolators and mounts? The answer lies in rubber’s ability to control shock of smaller scales. For larger scale impact stemming from heavy duty equipment, shock isolators made from plastic, steel and specialized polymers get the job done nicely.
