{
  "$type": "site.standard.document",
  "description": "A flutter control system (10) for a turbomachine fan includes a plurality of fan case sensors (12;38) located at a fan case of the turbomachine and configured to sense passing of blade tips of a fan of the turbomachine. A controller (30) is operably connected to the plurality of fan case sensors…",
  "path": "/patents/1001625",
  "publishedAt": "2012-06-06T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F02K1/15",
    "HAMILTON SUNDSTRAND CORP [US]"
  ],
  "textContent": "A flutter control system (10) for a turbomachine fan includes a plurality of fan case sensors (12;38) located at a fan case of the turbomachine and configured to sense passing of blade tips of a fan of the turbomachine. A controller (30) is operably connected to the plurality of fan case sensors (12;38). A variable fan area nozzle actuator (32) is operably connected to the controller (30), such that the variable fan area nozzle actuator (32) urges a change in fan nozzle area (30) in response to data from the plurality of fan case sensors (12;38) indicating flutter or near flutter conditions. A method of flutter control for a turbomachine fan includes sensing a blade tip passing of a plurality of fan blades (18). Data from a plurality of fan case sensors (12;38) are compared to a threshold and a fan exit area (36) is changed based on the comparison to dampen flutter of the plurality of fan blades.",
  "title": "Active fan flutter control system and method"
}