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Abstract

The purpose of the present invention is to provide a test piece characteristic estimation method capable of quickly measuring the moment of inertia of a test piece while taking loss resulting from rotational friction of the test piece into consideration. This test piece characteristic estimation method is provided with a step (S1) for measuring a first transfer function G1 from a torque current command for a dynamometer to output from a shaft torque sensor by vibrationally operating the dynamometer, a step (S2) for measuring a second transfer function G2 from the torque current command to the output of a dynamo rotation speed sensor by vibrationally operating the dynamometer, and steps (S3 and S4) for calculating the value of a ratio obtained by dividing the second transfer function G2 by the first transfer function G1 at a prescribed measurement frequency ω_k and using the ratio value to calculate a moment of inertia Jeg and a rotational friction Ceg.

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First Claim