Abrasive wear — Archard wear law, two-body vs. three-body abrasion, hardness ratio, abrasion-resistant steels, ceramics, rubber liners, slurry wear, ASTM G65/G105/G75 testing.
Anti-lock braking system (ABS) — wheel slip control, slip ratio, hydraulic modulator, ECU logic, brake force distribution, stability, SAE J2246, vehicle dynamics.
Absorption refrigeration — LiBr-water and NH3-water cycles, COP, generator/absorber/condenser/evaporator heat duties, waste heat driven cooling, double-effect cycles, ASHRAE standards.
Accelerated life testing (ALT) — Arrhenius/Coffin-Manson/power-law models, acceleration factors, HALT/HASS, Weibull analysis, test planning, MIL-HDBK-781, IEC 60068.
Acoustic emission (AE) testing — Kaiser effect, source location, AE parameters (count, energy, amplitude), wave modes, transducer selection, pressure vessel monitoring, ASME Section V Article 12, ASTM E1316.
Acoustic enclosure design — insertion loss, transmission loss (mass law), coincidence frequency, damping, leakage, vibration isolation, OSHA/ISO limits, NR/NC curves.
Acoustic fatigue — random acoustic loading on panels, SPL/OASPL, Miner's rule for random fatigue, Miles equation, panel response, jet engine exhaust, MIL-STD-1530, ESDU 84008.
Acoustic-induced vibration (AIV) in piping — Carucci-Mueller method, flow-induced noise, acoustic power, pipe wall response, branch connections, EI guidelines, NORSOK L-002.