Harvard College

Siemens Canada Limited

Jette, François-xavier

Carson, Carl, J.

Gillespie, Thomas, Harold

Farhangi, Mehran

Smith-roberge, Evelyne

Schaenzer, Megan

Booth-morrison, Christopher

Scarinci, Thomas

Guerrero, Fabian Enrique Sanchez

Gerendas, Miklos

Shanian, Ali

Pham, Minh Quan

Innes, Matthew, Christopher

Minh Quan Pham

Miklos Gerendas

Katia Bertoldi

Megan Schaenzer

Ali Shanian

Farhad Javid

Matthew Christopher Innes

Fabian Enrique Sanchez Guerrero

Christopher Booth-Morrison

François-Xavier Jette

Evelyne Smith-Roberge

François Jette

Genevieve Bourgeois

Thomas Scarinci

Carl J Carson

Thomas Harold Gillespie

Benoit Villien

Mehran Farhangi

Michael James Taylor

An acoustic damper includes a low porosity layer section and a housing. The low porosity layer section is formed in a liner of a gas turbine combustor and has an arrangement of elongated generally S-shaped slots formed therein. The housing has a plurality of feed apertures. The housing is coupled to the low porosity layer section thereby defining a cavity such that air outside the housing is configured to flow through the apertures and through the elongated generally S-shaped slots in the low porosity layer section, thereby transforming acoustic energy into thermal energy and aiding in providing an acoustic dampening effect for the gas turbine combustor during operation thereof.

Acoustic damper for gas turbine combustors with orthogonal slots

The present concepts include a zero-porosity structure having a plurality of structural elements arranged to provide a negative Poisson's ratio and, further, a new mechanism to generate negative Poisson's ratio is single material, zero-porosity structure.

Zero-porosity NPR structure and tuning of NPR structure for particular localities

In at least some aspects, an auxetic structure includes a first sheet defining therein a plurality of a plurality of structural elements projecting from the first sheet, the plurality of structural elements being arranged to provide a negative Poisson's ratio, and a second sheet disposed adjacent the first sheet to define a first internal cavity between the first sheet and the second sheet. In yet other aspects, one or more additional sheets may be advantageously provided to provide a multi-layered structure having auxetic properties.

Negative poisson's ratio waffle structures

Auxetic structures, low porosity auxetic sheets, systems and devices with auxetic structures, and methods of using and methods of making auxetic structures are disclosed. An auxetic structure is disclosed which includes an elastically rigid body with a plurality of apertures extending through the elastically rigid body and a plurality of protrusions projecting from the elastically rigid body. The apertures and protrusions are arranged in an engineered pattern, such as an array of rows and columns. The apertures are cooperatively configured with the protrusions to provide a predefined porosity while exhibiting stress reduction through negative Poisson's Ratio (NPR) behavior under macroscopic planar loading conditions. In some embodiments, the protrusions, which are elliptical or semispherical dimples, are interposed in square or hexagonal patterns with the apertures, which are S-shaped through slots or circular boreholes.

Hybrid dimple-and-void auxetic structures with engineered patterns for customized NPR behavior

Growing community of inventors

Saint-Laurent, Canada

Minh Quan Pham