Transfer function estimation apparatus, method and program

摘要

An apparatus for estimating a transfer function of at target object having divided systems is disclosed. The apparatus acquires an estimation equation to estimate the transfer function of the target object, and determines, for each arithmetic operation in the estimation equation, whether the arithmetic operation is an addition or a multiplication. For the multiplication, the apparatus performs the multiplication of frequency response characteristics in the frequency domain. For addition, the apparatus converts the frequency response characteristics into time response characteristics, performs the addition of the time response characteristics in the time domain, and reconverts a result of the addition into the frequency domain.

主权项

1. A transfer function estimation apparatus for estimating a transfer function of a measurement target object having a plurality of divided systems, the transfer function estimation apparatus comprising:
an estimation equation acquisition section that acquires an estimation equation to estimate the transfer function of the measurement target object determined in accordance with the number of divided systems of the measurement target object and a connection form of the divided systems of the measurement target object; a frequency response characteristic acquisition section that acquires frequency response characteristics which are obtained by converting acceleration data into data in a frequency domain, wherein the acceleration data are data of acceleration that is output from a predetermined output point of the measurement target object in response to input of an impact force to a predetermined input point of the measurement target object, wherein the frequency response characteristics include gain and phase associated with the input to and the output from the measurement target object; a four arithmetic operation determination section that determines, using a computer processor, for each arithmetic operation in the estimation equation, whether the arithmetic operation is an addition-subtraction or a multiplication-division; a multiplication-division section that,
in cases where the four arithmetic operation determination section determines that the arithmetic operation is the multiplication-division,performs the multiplication-division of the frequency response characteristics in the frequency domain; a conversion section that,
in cases where the four arithmetic operation determination section determines that the arithmetic operation is the addition-subtraction,converts the frequency response characteristics, which are targeted for the addition-subtraction, into time response characteristics to thereby calculate the time response characteristics, which are data in a time domain; an addition-subtraction section that performs the addition-subtraction of the time response characteristics in the time domain; and a reconversion section that reconverts a result of the addition-subtraction performed by the addition-subtraction section into the frequency domain.