เครื่องคำนวณความแข็งของสปริงเทียบเท่า

Use parallel springs when you need to increase the overall stiffness — for example, mounting multiple springs side by side under a machine. The equivalent stiffness is the sum of all individual stiffnesses.

Use series springs when you need to decrease the overall stiffness or increase flexibility — for example, stacking springs end-to-end. The equivalent stiffness is always less than the weakest individual spring.

In a parallel arrangement, all springs share the same deflection but each carries a portion of the load. The total force is the sum of the forces in each spring, so the effective stiffness is k_eq = k₁ + k₂ + … + kₙ.

For n identical springs of stiffness k, the equivalent stiffness is simply n × k.

Series spring configurations appear in many engineering systems:

• Multi-stage shock absorbers with stacked springs
• Automotive valve springs in some configurations
• Rubber isolation pads stacked vertically
• Multi-layer leaf spring systems
• Drill string assemblies

Yes. Natural frequency depends on both mass and stiffness: f = (1/2π)√(k/m). Adding springs in parallel increases k_eq, raising the natural frequency. Adding springs in series decreases k_eq, lowering it.

Doubling identical parallel springs doubles k_eq and increases frequency by √2 ≈ 1.41.

Spring stiffness can be measured several ways:

• Static test: Apply a known force and measure deflection. k = F/δ.
• Compression testing machine: Record the full force-deflection curve.
• Dynamic test: Mount a known mass, measure free vibration frequency. k = m × (2πf)².
• Manufacturer datasheet: Most commercial springs have a rated spring rate.