International Journal of Scientific Research and Engineering Development

Under-platform dampers (UPDs) remain the most widely deployed friction-damping device in gas turbine bladed disks, yet their nonlinear, history-dependent contact behaviour means that neither their performance nor their optimal geometry can be established analytically alone: both depend on experimental characterization. This review surveys the experimental infrastructure the field has built for this purpose — single- and dual-damper test rigs, contact-force and relative-displacement instrumentation, and the parameter-identification workflows that convert measured data into usable contact-model inputs — and the design-optimization literature that this infrastructure supports, spanning symmetric and asymmetric wedge geometries, reliability- and uncertainty-aware formulations, and, most recently, gradient-free topology optimization. Particular attention is given to a gap that recurs across this literature: essentially all published UPD test rigs and optimization studies operate at or near room temperature and a single nominal preload, so the extent to which a geometry optimized under laboratory conditions remains close to optimal once operating temperature and its attendant contact-parameter drift are taken into account is presently unresolved. The review closes by identifying this thermally-robust design question, together with the closely related uncertainty-quantification literature, as the most consequential open direction for UPD design methodology.

Dr. Shailendra Kumar Bohidar, "Friction-Based Vibration Damping in Gas Turbine Blades: Experimental Insights and Design Strategies for Under-Platform Dampers " International Journal of Scientific Research and Engineering Development, V8(6): Page(3268-3276) Nov-Dec 2025. ISSN: 2581-7175. www.ijsred.com. Published by Scientific and Academic Research Publishing.