title: A wind-powered one-way bistable medium with parity effects.
abstract: We describe the design, construction, and dynamics of low-cost mechanical arrays of 3D-printed bistable elements whose shapes interact with wind to couple them one-way. Unlike earlier hydromechanical unidirectional arrays, our aeromechanical one-way arrays are simpler, easier to study, and exhibit a broader range of phenomena. Solitary waves or solitons propagate in one direction at speeds proportional to wind speeds. Periodic boundaries enable solitons to annihilate in pairs in arrays with an even number of elements. Solitons propagate indefinitely in odd arrays that frustrate pairing. Large noise spontaneously creates soliton-antisoliton pairs. Soliton annihilation times increase quadratically with initial separations, as expected for random-walk models of soliton collisions.
authors.affiliation: Physics Department, The College of Wooster, Wooster, Ohio 44691, USA.
authors.forename: Tessa
authors.initials: T
authors.lastname: Rosenberger
authors.affiliation: Physics Department, The College of Wooster, Wooster, Ohio 44691, USA.
authors.forename: Graham
authors.initials: G
authors.lastname: Schattgen
authors.affiliation: Physics Department, The College of Wooster, Wooster, Ohio 44691, USA.
authors.forename: Matthew
authors.identifier: 0000000269389857
authors.initials: M
authors.lastname: King-Smith
authors.affiliation: Physics Department, The College of Wooster, Wooster, Ohio 44691, USA.
authors.forename: Prakrit
authors.initials: P
authors.lastname: Shrestha
authors.affiliation: Physics Department, The College of Wooster, Wooster, Ohio 44691, USA.
authors.forename: Katsuo J
authors.initials: KJ
authors.lastname: Maxted
authors.affiliation: Physics Department, The College of Wooster, Wooster, Ohio 44691, USA.
authors.forename: John F
authors.initials: JF
authors.lastname: Lindner