Patent ID: 11879807
Assignee: MEIDENSHA CORPORATION
Field: Control (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A system identification method that identifies, by a computer, values of a plurality of model parameters included in a model that reproduces input-output characteristics from input to output in a dynamometer system that includes a test piece and a dynamometer coupled to the test piece, the method comprising the steps of:
measuring a frequency response from input to output in the dynamometer system under n sets of disturbances of different magnitudes (n is an integer of 2 or more);
calculating a frequency response from input to output in n sets of models including i sets of common parameters (i is an integer of 1 or more) that do not vary by way of a disturbance and j sets of disturbance variable parameters (j is an integer of 1 or more) that vary by way of a disturbance;
calculating values of a total of n sets of evaluation functions and a sum of the n sets of evaluation functions based on a frequency response measured under a k-th disturbance (k is an integer between 1 and n) and a frequency response of a k-th model; and
identifying values of i sets of common parameters and j×n sets of disturbance variable parameters such that the sum satisfies a predetermined condition by repeatedly calculating the frequency response and the sum while changing the values of the i sets of common parameters and j×n sets of disturbance variable parameters, wherein
the model is a multiple inertia system mechanical model including two or more inertial bodies and one or more shaft bodies coupling each of the inertial bodies,
the common parameters include moments of inertia of the inertial bodies, and
the disturbance variable parameters include at least any of a spring stiffness of the shaft body and a spring loss of the shaft body.