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Foundation Natural Frequency Calculator

Resonance Analysis ยท Frequency Separation ยท GMRC Guidelines

Foundation Natural Frequency
Calculate foundation natural frequencies and verify adequate separation from compressor operating speed. Per GMRC guidelines, foundation natural frequencies should be at least 20% away from operating speed and harmonics. Horizontal modes typically 5-8 Hz; vertical/rocking modes 20-24 Hz.

Foundation Properties

lbs
lbs
ft
ft

Soil Properties

psi
-
-

Operating Conditions

RPM
RPM

Analysis Parameters

GMRC Frequency Targets

  • Horizontal modes: 5-8 Hz (300-500 CPM)
  • Vertical/rocking: 20-24 Hz (1250-1450 CPM)
  • Separation: โ‰ฅ20% from operating
  • Variable speed: More challenging

Typical Soil Shear Modulus

  • Soft clay: 2,000-5,000 psi
  • Stiff clay: 5,000-15,000 psi
  • Loose sand: 3,000-8,000 psi
  • Dense sand: 10,000-25,000 psi
  • Rock: 50,000+ psi