초록 ▼

A nose cone formed from a shape memory alloy (SMA) having a recoverable strain of at least 2% collapses about the dome for storage, deploys at launch to protect the sensor dome and reduce drag during atmospheric flight and is shed to allow sensing for terminal maneuvers. The SMA is shape-set at elev

A nose cone formed from a shape memory alloy (SMA) having a recoverable strain of at least 2% collapses about the dome for storage, deploys at launch to protect the sensor dome and reduce drag during atmospheric flight and is shed to allow sensing for terminal maneuvers. The SMA is shape-set at elevated temperatures in its Austenite phase with a memorized shape having a radius of curvature greater than that of the sensor dome to reduce aerodynamic drag. The temperature is reduced and the SMA collapsed to conform to the curvature of the sensor dome within the recoverable strain for storage. A first mechanism is configured to return the collapsed SMA to its memorized shape at launch or prior to going supersonic. In one embodiment, the SMA is stored below its Martensite finish temperature in a temperature-induced Martensite phase in which case the mechanism heats the SMA above the Austenite finish temperature to return the material to its memorized shape. In another embodiment, the SMA is stored above its Austenite finish temperature in which case collapsing the SMA places the material in a strain-induced Martensite phase. The mechanism holds the collapsed SMA in place and the releases the stored energy allowing the SMA to return to the memorized shape.

대표청구항 ▼

We claim: 1. A nose cone assembly for covering a sensor dome of an air vehicle during flight, comprising a nose cone including an outer skin and a shape memory alloy (SMA) having a recoverable strain of at least 2% shape-set with a memorized shape having a radius of curvature greater than that of sa

We claim: 1. A nose cone assembly for covering a sensor dome of an air vehicle during flight, comprising a nose cone including an outer skin and a shape memory alloy (SMA) having a recoverable strain of at least 2% shape-set with a memorized shape having a radius of curvature greater than that of said sensor dome, said SMA collapsed to conform to the curvature of the sensor dome within the recoverable strain, and a mechanism that returns the collapsed SMA to its memorized shape to form the nose cone.