Wave Pads _hot_ Access

Vibration isolation begins at ( f > \sqrt2 f_n ). For effective isolation below 50 Hz (common for HVAC or large motors), ( f_n ) must be ≤ 5 Hz, requiring very soft pads. However, static deflection limits apply: ( \delta_static = g / (2\pi f_n)^2 ). For ( f_n = 5 ) Hz, ( \delta \approx 10 ) mm – often impractical. Thus, wave pads are typically tuned for 10–30 Hz isolation, offering a compromise between low-frequency performance and stability. Geometric features (pyramids, channels, or periodic bumps) on the pad’s surface convert longitudinal waves into slower shear waves, increasing path length and viscoelastic loss. The loss factor ( \eta ) (ratio of dissipated to stored energy per cycle) for filled elastomers ranges from 0.05 to 0.3. 3. Materials and Manufacturing Common wave pad materials and their properties:

For typical steel-elastomer-steel sandwich, ( T \approx 0.01 ) at normal incidence, providing 20 dB reduction. A wave pad acts as a spring-mass system. The mounted equipment (mass ( m )) sits on pads with total stiffness ( k ). The natural frequency ( f_n ) is: wave pads

[ f_n = \frac12\pi \sqrt\frackm ]

Surface patterns are molded or die-cut. Typical thickness: 6–25 mm. Load ratings: 50–5000 kPa. 4.1 Methodology A standardized test was conducted using an electrodynamic shaker (10–500 Hz) exciting a 50 kg steel mass mounted on four 100×100×12 mm wave pads (neoprene, 40 Shore A). Acceleration was measured on the source mass and on the base plate. Insertion loss (IL) was computed as: Vibration isolation begins at ( f > \sqrt2 f_n )