KIPP Catalog Operating Elements & Standard Elements Page 576
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Technical information Swivel feet and plates with vibration absorption Natural frequency: Every sprung weight, such as a machine or piece of equipment, that is standing on swivel feet with vibration absorbers vibrates after an initial impetus at its own natural frequency (resonance frequency). In the diagram to the side (Fig. 1) the natural frequency of Sylomer V12 under pressure by various forces can be read. The optimum range of use is with a pressure of ≤ 0.4 N/mm. A maximum pressure of 0.6 N/mm should not be exceeded. N/mm2 0.8 0.7 0.6 static surface load Interference frequency: The frequency emitted by a machine or a piece of equipment is known as its interference frequency. Effective vibration absorption is dependent on the interference frequency (the frequency to be absorbed) and the natural frequecy of the absorption unit. The greater the difference in frequency between the natural frequency and the interference frequency, the better the absorption. An absorbing effect will only be achieved if the interference frequency is over √2 times the natural frequency of the absorption unit. Fig. 1 0.5 0.4 0.3 0.28 0.2 0.1 0 5 6 7 8 9 10 12 14 16 18 20 21 natural frequency Calculation example: = 300 N 529,5 mm2 = 0,57 N/mm2 Fig. 2 Hz 200 > 0,4 N/mm2 Pressure: F A 300 N = 1087,2 mm2 180 0d M16, D1=40,5 300N 160 = 0,28 N/mm 2 140 < 0,4 N/mm2 The M16 swivel foot is chosen since the pressure is ≤ 0.4 N/mm2. From Fig. 1, a pressure of 0.28 N/mm2 gives a natural frequency of 21 Hz. With an interference frequency of 44 Hz an absorption effect of 69% is achieved (Fig. 2). interference frequency Swivel foot: Loading: 99 %) F A 50 Hz B( Pressure: %) –4 M12, D1=30,5 300N 40 97 B( D= Swivel foot: Loading: 30 0d D= –3 120 100 ) dB –20 (90% 80 D= 60 (69%) 10 dB D=– (0%) D = 0 dB 44 40 20 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 Hz 21 natural frequency 575
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