Magnetorheological fluid cell systems and methods
AssigneePurdue Research Foundation
InventorsMo Rastgaar, Gabriel Andrés Torres Rivera
Life of this patent
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Abstract
A magnetorheological apparatus includes a flexible body formed of an elastomer material, a plurality of cell cavities defined by the flexible body, a magnetorheological (MR) fluid disposed within each cell cavity of the plurality of cell cavities, and a magnetic field inductor positioned adjacent to at least one of the cell cavities. Each cell cavity of the plurality of cell cavities is fluidly encapsulated within the flexible body. The magnetic field inductor is selectively operable to vary a magnetic field, and the MR fluid within the at least one cell cavity is configured to vary a stiffness of the at least one cell cavity in response to the magnetic field.
Claims19
A magnetorheological joint system, comprising:
- (a) a first joint element;
- (b) a magnetorheological apparatus coupled with the first joint element, including:
- (i) a flexible body formed of a material including an elastomer;
- (ii) a plurality of cell cavities defined by the flexible body, wherein each cell cavity of the plurality of cell cavities is fluidly encapsulated within the flexible body;
- (iii) a magnetorheological (MR) fluid disposed within each cell cavity of the plurality of cell cavities;
- and
- (iv) a magnetic field inductor positioned adjacent to at least one of the cell cavities, wherein the magnetic field inductor is selectively operable to vary a magnetic field, wherein the MR fluid within the at least one cell cavity is configured to vary a stiffness of the at least one cell cavity in response to the magnetic field, and
- (c) a second joint element configured to movably contact the magnetorheological apparatus such that the magnetorheological apparatus provides multiple degrees of freedom of movement between the first joint element and the second joint element with variable stiffness.
A magnetorheological apparatus, comprising:
- (a) a flexible body formed including an elastomer material, wherein the flexible body includes a first portion defining a plurality of hexagonal cell cavities each having an open end and a second portion shaped to close the open end of each of the plurality of cell cavities, wherein each cell cavity of the plurality of cell cavities is fluidly encapsulated within the flexible body upon being closed using the second portion;
- and
- (b) a magnetorheological (MR) fluid disposed within each cell cavity of the plurality of cell cavities, and
- wherein a first side of the flexible body is configured to movably couple with a first articulated component and a second side of the flexible body is configured to movably couple with a second articulated component, wherein the magnetorheological apparatus is selectively operable to act as a joint having variable stiffness between the first articulated component and the second articulated component.
A method of manufacturing a magnetorheological apparatus, wherein the magnetorheological apparatus includes a flexible body, a plurality of cell cavities defined by the flexible body, and a magnetorheological (MR) fluid disposed within each cell cavity, the method comprising:
- (a) providing a first articulated component and a second articulated component;
- (b) molding the flexible body;
- (c) casting the flexible body using an elastomeric material;
- and
- (d) inserting the MR fluid into each cell cavity defined by the flexible body, wherein inserting the MR fluid includes puncturing the flexible body with a first syringe and injecting the magnetorheological fluid, and puncturing the flexible body with a second syringe, using the second syringe to simultaneously extract air from the cell cavity;
- and
- (e) forming an articulable joint between the first articulated component and the second articulated component, including:
- (i) movably coupling a first side of the flexible body with the first articulated component;
- and (ii) movably coupling a second side of the flexible body with the second articulated component, wherein the magnetorheological apparatus comprising the flexible body is selectively operable to act as a joint having variable stiffness between the first articulated component and the second articulated component.
Dependencies are inferred from the claim text.