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Young’s Modulus Spring Resonant Frequency Calculator

This calculator estimates the resonant frequency of a spring using geometric parameters, material density, and modulus of rigidity (G). It is ideal for evaluating coil spring dynamics in precision mechanical, automotive, and vibration systems.

Spring Resonance Estimator Using Shear Modulus

Input Fields
D
m
Mean diameter of the coil
d
m
Diameter of the wire
n
Number of active turns
ρ
kg/m³
Density of the spring material (e.g., 7850 for steel)
G
Pa
Shear modulus of the material
If enabled, the result will update automatically when you change any value.

Spring Resonant Frequency with Young’s or Shear Modulus

Formula
$$f_{\text{res}} = \frac{d}{D^2} \cdot \sqrt{ \frac{9 \cdot G}{n \cdot \rho} }$$

Where:

  • $$f_{\text{res}}$$ = resonant frequency (Hz)
  • $$d$$ = wire diameter (m)
  • $$D$$ = coil diameter (m)
  • $$n$$ = number of active coils
  • $$\rho$$ = material density (kg/m³)
  • $$G$$ = shear modulus (Pa)

This formula derives from spring-mass dynamics and material elasticity, assuming no damping.


Young’s Modulus Spring Resonant Frequency – Calculation Example

Given:

  • $$d$$ = 0.003 m
  • $$D$$ = 0.03 m
  • $$n$$ = 8
  • $$\rho $$= 7850 kg/m³ (steel)
  • $$G$$ = 79.3 × 10⁹ Pa

Calculation:

  1. $$f_{\text{res}} = \frac{0.003}{0.03^2} \cdot \sqrt{ \frac{9 \cdot 79.3 \cdot 10^9}{8 \cdot 7850} }$$
  2. $$= \frac{0.003}{0.0009} \cdot \sqrt{ \frac{713.7 \cdot 10^9}{62800} }$$
  3. $$≈ 3.33 \cdot \sqrt{1136226.11} ≈ 3.33 \cdot 1065.2 ≈ 3547~\text{Hz}$$


The resonant frequency of a coil spring can be accurately modeled using the wire’s geometry, density, and elastic modulus. This calculator is essential for engineers designing suspension systems, vibration isolators, and mechanical resonators, where precise frequency control is required. It allows designers to explore how changing wire diameter, number of coils, or material affects dynamic performance.

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