Reduce vibration.
Material + design.
Quieter products.
Vibration damping requires understanding material loss factor, mass-spring-damper systems, isolation. Combined material + design approach.
Key principles.
Higher = better
Cast iron η=0.005, steel 0.001, polymers 0.05-0.5. Polymers damp more than metal.
Constrained layer
Sandwiched constrained-layer damping. Visco-elastic film between two stiff layers.
Calculate frequencies
Vibration isolators decouple equipment from environment. Calculate natural frequency for application.
Design separation
Operating frequency ≠ structure natural frequency. Design separation > 25%.
Stiffness > damping
Stiffer structure = higher natural frequency. Move resonance away from operating range.
Tighter dampens
Press fit transmission components reduce vibration vs loose fits.
FAQ
What is loss factor η?
Measure of energy dissipated per cycle. Higher η = more damping. Materials: rubber > plastic > metal.
Constrained layer damping?
Visco-elastic damping material between two stiff layers. Energy dissipated as heat through shear of damping layer.
Vibration isolator selection?
Match isolator natural frequency well below excitation. Ratio f/fn > 1.4 for damping.
Damping for fatigue?
Reduces cyclic strain on parts. Extends fatigue life. Particularly for parts in vibrating environment.
Cost of damping treatment?
Constrained layer adds 10-20% cost. Isolators add per-piece cost. Worth it for vibration-sensitive applications.
Active damping?
Sensor + actuator + controller. Electronics-active damping. Specialty for high-end applications.
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