Vibration Isolation of Machine Foundations


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Vibration Isolation of Machine Foundations - 1

Vibration Isolation of Machine Foundations Active and Passive Isolation

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Vibration Technology Vibration Isolation of Machine Foundations Load Ranges: Unwanted vibrations and shock impact occur in nearly all technical equipment and machinery − but elastic bedding with the well-known materials Regupol® and Regufoam® reliably prevent the distribution of these vibration forces. The material Regupol is composed of rubber fibres, rubber granulates (SBR, NBR) and polyurethanes, and Regufoam® is a mixed-cell polyurethane foam. ® 0.85 0.60 Permanent load in N/mm² BSW has produced, sized and supplied material for the vibra­ tion isolation of machine foundations for over...

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Vibration Isolation of Machine Foundations - 3

Vibration Technology The easiest example to describe a vibrating system is a singledegree-of-freedom system (SDOF system). An inert mass is on a rigid base, separated by an elastic element. The machine (= mass) is decoupled from its ambient area by way of a spring and a damper. Only one degree of freedom is applied and usually only the vertical movement is considered. (machine + suspended foundations) The special elastomers Regupol® and Regufoam® simultaneously serve as spring and damper. The model is quite useful in explaining basic issues of vibration isolation and is helpful in selecting...

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Vibration Technology If a vibration-capable system is made to vibrate and then left to its own devices, it vibrates with the so-called natural frequency until it dies away. When energy is withdrawn from sound we speak of damping. This typically occurs through dissipation, by transforming the sound energy into heat by way of friction. In machine foundation isolation, the natural frequencies of this system can be deliberately influenced by varying its rigidity and inertial properties. In the case of elastomers we observe the mechanical damping η (loss factor). The loss factor is a measurement...

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Vibration Technology Airborne Sound Insulation / Structure-Borne Sound Insulation When it comes to machines, considering the airborne insulation often does not suffice. This is illustrated by the following example: The music box in the illustration at the top represents our machine. When the clock mechanism is wound up, the barrel begins to turn, and the 18 pins generate a soft melody. Due to the small geometric dimensions of the device, only a few of the oscillations are transformed into airborne sound. The melody only becomes louder when the vibrationdistributing surface is enlarged. This...

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Vibration Technology Insertion Loss / Isolation Efficiency The success of an elastic solution can be described using the example of insertion loss or the isolation efficiency factor. Insertion loss describes the difference between the application of force in the ambient area using “rigid” and “elastic” bedding. The isolation effect depends on the ratio between the natural ­ frequency ω0 and the interfering frequency ω. The natural frequency should be below the lowest interfering frequency (low adjustment). The softer the elastomer and thus the lower the natural frequency, the better the...

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Vibration Technology Dimensioning Machine Foundation Isolation Dimensioning vibration-isolating measures is the duty of the expert consultant. He or she is the only person who can judge the complex overall building dynamics. When planning elastic machine foundation isolation, special care must be taken that component resonances are avoided. Attention should also be paid to the place where equipment is installed. The simplified view of regarding the machine as a single-degree-of-freedom system is based on an ideal, rigid placement of the elastomer. When excitation masses are not very...

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Vibration Technology Machine Foundation Isolation Regupol® vibration Step 1: Installing the Regupol® vibration isolation Step 2: Exact cut to the dimensions of the foundation Step 3: Setting up the formwork for the machine foundation Step 4: Putting in a PE foil with a minimum thickness of 0.2 m

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Step 5: Filling with concrete Step 6: Putting in the foundation reinforcement Step 7: Backfilling the remaining space with concrete and smoothing everything at the end Step 8: Allow to harden, then remove the formwork Vibration Technology

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Your contact to BSW GmbH BSW Berleburger Schaumstoffwerk GmbH Am Hilgenacker 24 57319 Bad Berleburg Germany Phone +49 2751 803-0 Made in Germany The technical information given in the documents are guideline values. They are liable to manufacturing tolerances, which may vary depending on the type of underlying properties. The currently valid versions of this information are provided on our internet pages and in the PDF versions of this catalogue. The PDF versions are available to download from our website. We do not...

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