摘要:
A tunable impedance load bearing structure includes a support comprising an active material configured for supporting a load, wherein the active material undergoes a change in a property upon exposure to an activating condition, wherein the change in the property is effective to change an impedance characteristic of the support.
摘要:
Systems for detecting animate objects in a vehicle compartment include active materials based sensors for detecting the presence of an animate object in the compartment. The systems produce a response if the sensors detect the presence of an animate object in the compartment and at least one other predetermined condition exists.
摘要:
A drain plug assembly that has particular application for sealing a drain hole in a high voltage battery compartment on a vehicle. The plug assembly includes a plug that inserted into the drain hole. The plug assembly further includes a return spring coupled to the plug and causing the plug to be biased into the drain hole. The plug assembly also includes at least one shape memory alloy device coupled to the plug and a support structure. The SMA device receives an electrical current that causes the device to contract and move the plug out of the drain hole against the bias of the return spring.
摘要:
A holding fixture operable to secure differing pluralities of positioned objects having differing geometric shapes, sizes, and/or dimensions, including an active material element configured to selectively enable, cause, or retain the securing engagement and/or return the fixture to a ready state when not in use.
摘要:
A system for and method of harvesting, storing and converting naturally occurring energy, includes exposing an active material, and more preferably a shape memory element to an ambient activation signal or condition, harvesting a portion of the energy by pseudoplastically straining or superelastically deforming the element, storing the energy by causing a change in the element and/or engaging a locking mechanism, and converting the energy by exposing the mechanism to an activation signal and/or otherwise releasing the mechanism.
摘要:
Remotely engageable and releasable suction cups include a pliable body and an active material in operative communication with the pliable body and configured to create and/or eliminate a partial vacuum through the activation of stiffness or geometry changes in the active material. Suitable active materials include shape memory materials such as shape memory alloys, ferromagnetic shape memory alloys, and shape memory polymers (SMP). A second class of active materials include materials that exhibit a change in at least one attribute when subjected to an applied field but revert back to their original state upon removal of the applied field. Active materials in this category include piezoelectric materials, electroactive polymers (EAP), magnetorheological polymers, and the like.
摘要:
An active headrest adapted for use with a rear seat, including a translatable, conformable, or otherwise reconfigurable shell, an active material actuator disposed within and drivenly coupled to the shell, and preferably including a linkage system fixedly coupled to the seat and/or shell, wherein the actuator is operable to cause the headrest to achieve one of a plurality of achievable positions.
摘要:
An active material-enabled overhead protection system (24) for protecting the occupants of vehicles (20) with overhead glass (22), such as sunroofs or panoramic windshields, during rollover events. The system (24) includes a protective structure (26) and a deployment device (28). The protective structure (26) has a stowed condition in which it does not obstruct the overhead glass (22), and a deployed condition in which it is interposed between the overhead glass (22) and the heads of the occupants of the vehicle (20). The deployment device (28) moves the protective structure (26) from the stowed condition to the deployed condition. The deployment device (28) includes a trigger (30) operable to initiate movement of the protective structure (26), and the trigger (30) includes an active material which can change shape in response to an actuation signal, and the change in shape initiates deployment of the protective structure (26).
摘要:
A cam lift and reset assembly includes a cam mounted on a rotatable shaft having a cam profile effective to provide a lifting force to a contacted part thereon upon rotation of the shaft and movement of the cam profile of the cam relative to the contacted part from a rest position to a lift position. The assembly also includes an active material in operative communication with the shaft, the active material being operative to change at least one property of the active material in response to an activation signal so as to effect rotation of the shaft. The assembly further includes a reset device in operative communication with the shaft to provide a reset force to the contacted part and counter-rotation of the shaft and movement of the cam profile of the cam relative to the contacted part from the lift position to the rest position.
摘要:
A mechanical system selectively imparts a prescribed motion to an output load using two or more actuators, including at least one having an active material element. The output load can be a locking member when the system is a vehicle transmission, a shuttle car of a linear system, or another device. A controller determines a total motive force required for imparting the prescribed motion, and selectively commands a combination of the actuators to provide the total motive force, apportioning the total motive force between the various actuators to optimize the performance of the system. An algorithm determines which combination of the actuators is the most suitable in moving the output load, and continuously modified this combination as needed as the output load is moved. The other actuator or actuators are then selectively energized as needed to provide the total motive force depending on this suitability determination.