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Spring Critical Speed Calculator

Kalkulahin ang critical surge frequency ng helical compression spring — ang resonant frequency kung saan nabubuo ang standing waves sa kabuuan ng coils, na nagdudulot ng surging.

Helical Spring Surge Frequency 4 Materials
Quick presets

Results

Surge Frequency
Surge Frequency (RPM)
Spring Stiffness (k)
Spring Index (C = D/d)
Loaded Frequency (both ends fixed)
Material

Surge Frequency

Ang critical surge frequency ng helical compression spring (free-free boundary, fundamental mode):

  • d — wire diameter (m)
  • D — mean coil diameter (m)
  • nₐ — bilang ng active coils
  • G — shear modulus ng wire material (Pa)
  • ρ — wire material density (kg/m³)

Katigasan ng Tagsibol

Indeks ng Tagsibol & Dalas sa Pagkarga

Ang spring index C ay dapat karaniwang nasa pagitan ng 3 at 15 para sa practical spring designs.

Praktikal na Halimbawa

Halimbawa — Compression Spring ng Bakal ng Tagsibol

Given: d = 5 mm, D = 30 mm, nₐ = 7, Spring steel (G = 79.3 GPa, ρ = 7850 kg/m³)

√(G / 2ρ) = √(79.3×10⁹ / (2 × 7850)) = 2247.4

f_surge = 0.005 / (2π × 7 × 0.030²) × 2247.4 = 283.9 Hz (17,032 RPM)

k = 79.3×10⁹ × 0.005⁴ / (8 × 0.030³ × 7) = 32.8 N/mm

C = D/d = 30/5 = 6.0 (mabuti, nasa loob ng 3–15 range)

f_loaded = 283.9 / 2 = 142.0 Hz

⚠️ Patnubay ng ikinabibili: Ang surge frequency ay dapat na hindi bababa sa 13× ng operating frequency para sa valve springs, at 15–20× para sa pangkalahatang industrial applications.

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