Gas turbine engine accessory gearbox detachmment system

A gas turbine engine system, comprising:

• a gas turbine engine configured to at least generate a drive torque;
• an accessory gear box coupled to the gas turbine engine and having at least one accessory gearbox accessory mounted therein, the accessory gearbox configured to receive and transfer at least a portion of the drive torque generated by the gas turbine engine to at least one accessory gearbox accessory;
• and
• an accessory gearbox detachment system, the accessory gearbox detachment system comprising:
• a vibration sensor mounted on the accessory gearbox, the vibration sensor configured to sense vibration levels of the accessory gearbox and supply sensor signals indicative thereof;
• at least one shape memory alloy (SMA) actuator mounted within the accessory gear box and configured, upon receipt of an activation signal, to move from an engage position to a disengage position;
• and
• a processing system in operable communication with the at least one SMA actuator and the vibration sensor, the processing system configured to receive and process the sensor signals to (i) determine a vibration level of the accessory gearbox, (ii) compare the vibration level to one or more predetermined threshold values, and (iii) supply the activation signal to the at least one SMA actuator when the determined vibration level exceeds the one or more predetermined threshold values,
• wherein:
• in the engage position, the at least one SMA actuator engages the at least one accessory gearbox accessory and couples the at least one accessory gearbox accessory to receive the at least a portion of the drive torque from the accessory gearbox, and
• in the disengage position, the at least one SMA actuator disengages from the at least one accessory gearbox accessory and detaches the accessory gearbox accessory from receiving the at least a portion of the drive torque from the accessory gear box.

An accessory gearbox detachment system, comprising:

• an accessory gearbox coupled to a plurality of accessory gearbox accessories;
• a vibration sensor mounted on the accessory gearbox, the vibration sensor configured to sense vibration levels of the accessory gearbox and supply sensor signals indicative thereof;
• a plurality of shape memory alloy (SMA) actuators mounted within the accessory gear box and associated with a different one of the accessory gearbox accessories, each SMA actuator configured, upon receipt of an activation signal, to move from an engage position to a disengage position;
• and
• a processing system in operable communication with the SMA actuators and the vibration sensor, the processing system configured to receive and process the sensor signals to (i) determine a vibration level of the accessory gearbox, (ii) compare the vibration level to one or more predetermined threshold values, and (iii) supply the activation signal to the SMA actuators when the determined vibration level exceeds the one or more predetermined threshold values,
• wherein:
• in the engage position, each SMA actuator engages its associated accessory gearbox accessory and couples its associated accessory gearbox accessory to receive a drive torque from the accessory gearbox, and
• in the disengage position, each SMA actuator disengages from its associated accessory gearbox accessory and detaches its associated accessory gearbox accessory from receiving the drive torque from the accessory gear box.