Method for speed excursion data acquisition

A method of monitoring a gas turbine engine, the method comprising:

• logging a gas producer rotor speed obtained from a sensor and a timestamp associated with the gas producer rotor speed;
• detecting a start of a level one overspeed event if the gas producer rotor speed exceeds a level one trigger threshold, a start of a level two overspeed event if the gas producer rotor speed exceeds a level two trigger threshold, and start a level three overspeed event if the gas producer rotor speed exceed a level three trigger threshold,
• in response to detecting the start of the level one overspeed event, detecting an end to the level one overspeed event if the gas producer rotor speed is less than a level one setpoint threshold;
• in response to detecting the start of the level two overspeed event, detecting an end to the level two overspeed event if the gas producer rotor speed is less than a level two setpoint threshold;
• in response to detecting the start of the level three overspeed event, detecting an end to the level three overspeed event if the gas producer rotor speed is less than a level three setpoint threshold;
• in response to detecting the level one overspeed event, generating a tag to include a level one overspeed event value, the gas producer rotor speed, and the timestamp;
• in response to detecting the level two overspeed event, generating the tag to include the level one overspeed value, a level two overspeed event value, the gas producer rotor speed, and the timestamp;
• in response to detecting the level three overspeed event, generating the tag to include the level one overspeed value, the level two overspeed value, a level three overspeed event value, the gas producer rotor speed, and the timestamp;
• reading the tag to detect the level one overspeed event, the level two overspeed event, and the level three overspeed event;
• and
• in response to detecting the level one overspeed event, records a plurality of tags including the level one overspeed event value, level two overspeed event value, and level three overspeed event value, the gas producer rotor speed, the timestamp.

A control system for monitoring a gas turbine engine, the control system comprising:

• a sensor connected to the gas turbine engine;
• one or more processors configured to
• log a gas producer rotor speed obtained from the sensor and a timestamp associated with the gas producer rotor speed;
• detect a start of an overspeed event if the gas producer rotor speed exceeds a trigger threshold;
• in response to detecting the start of the overspeed event, detect an end of the overspeed event if the gas producer rotor speed falls below a setpoint threshold;
• in response to detecting the overspeed event, generate the tag to include an overspeed event value, the gas producer rotor speed, and the timestamp;
• read the tag to detect the overspeed event;
• and
• in response to detecting the overspeed event, record a plurality of tags including the overspeed event value, the gas producer rotor speed, the timestamp, from the start of the overspeed event to the end of the overspeed event.