Condition monitoring system and wind turbine generation apparatus

A condition monitoring system that monitors a condition of a mechanical component in an apparatus, the condition monitoring system comprising:

• a vibration sensor configured to measure a vibration waveform of the mechanical component;
• and
• a processor configured to diagnose abnormality of the mechanical component,
• the processor including
• a diagnosis unit configured to diagnose abnormality of the mechanical component by comparing an effective value of vibration waveform data output from the vibration sensor with a threshold and
• a setting unit configured to set the threshold,
• the setting unit including
• a first computing unit configured to compute a moving average value of effective values of n pieces (where n is an integer equal to or greater than two) of the vibration waveform data output from the vibration sensor,
• a second computing unit configured to compute a standard deviation of effective values of the n pieces of vibration waveform data, and
• a third computing unit configured to compute the threshold based on the moving average value computed by the first computing unit and the standard deviation computed by the second computing unit.

A condition monitoring system that monitors a state of a mechanical component in an apparatus, the condition monitoring system comprising:

• a vibration sensor configured to measure a vibration waveform of the mechanical component;
• and
• a processor configured to diagnose abnormality of the mechanical component,
• the processor including
• an evaluation value computing unit configured to time-sequentially compute an evaluation value that characterizes vibration waveform data output from the vibration sensor within a certain time, and
• a diagnosis unit configured to diagnose abnormality of the mechanical component using the vibration waveform data by starting measurement of the vibration waveform data, using change of tendency of temporal change of the evaluation value computed by the evaluation value computing unit, as a trigger.