Synchronization of aircraft engines

An apparatus for improving synchronization of two engines on an aircraft where each engine comprises a first spool and a second spool, and, where a rotational speed of a first spool of a first engine has been substantially synchronized with a rotational speed of a first spool of a second engine, the apparatus comprising:

• a first vibration sensor configured to detect vibrations of the first engine;
• a second vibration sensor configured to detect vibrations of the second engine;
• a processor operationally coupled to receive signals indicative of the vibrations detected by the first and second vibration sensors;
• and
• a non-transitory storage medium including machine-readable instructions executable by the processor and configured to cause the processor to:
• using the signals indicative of the vibrations detected by the first and second vibration sensors, determine a bias to be added to a sensed parameter useful in controlling the first engine to cause a change in rotational speed of the second spool of the first engine in relation to the rotational speed of the first spool of the first engine;
• and
• generating an output configured to instruct a controller of the first engine to use the bias with the sensed parameter for controlling the first engine.

A method for improving synchronization of two turbo-fan engines on an aircraft where each turbo-fan engine comprises a spool, the method comprising:

• receiving feedback indicative of the spool of the first engine and the spool of the second engine having different rotational speeds;
• generating an output configured to instruct a controller of the first engine to control the first engine to cause a change in rotational speed of the spool of the first engine in relation to the rotational speed of the spool of the second engine and substantially synchronize the spool of the first engine with the spool of the second engine;
• and
• determining a preferred synchronization time based on the feedback and generating the output based on the preferred synchronization time.