MONITORING OPERATION OF A MACHINE

A method, apparatus and computer program are provided for monitoring operation of a machine having a mechanical component. the method involves receiving sensor data comprising a time series of measurements of an operational parameter of the machine corresponding to a state variable and processing the time series of measurements for the state variable using a machine-learning model pre-trained to predict normal operational behaviour of the machine based on values of the state variable observed for a time period during normal operation of the machine. The standardized residual for the state variable is calculated across the time series based on a prediction of the pre-trained machine-learning model and any deviation from normal operation of the machine is identified based on values of the standardized residual.