Method and apparatus for reducing vibrations of stationary induction apparatus

Claim 1

A method for reducing vibrations generated in a stationary induction apparatus comprising the steps of detecting the vibrations by vibration sensing means, and applying a vibration applying force capable of suppressing the detected vibrations to said stationary induction apparatus by vibration applying means; wherein said method comprises the further steps of: energizing said vibration applying means; receiving detected amplitude values of the vibrations from a plurality of vibration sensors constituting said vibration sensing means; calculating the sum of the squares of said amplitude values of vibration; and varying the phase and amplitude of the vibration applying force outputted from said vibration applying means in the direction of decreasing the calculated sum of the squares of amplitude values of vibration.

Claim 2

A method for reducing vibrations generated in a stationary induction apparatus comprising the steps of detecting the vibrations by vibration sensing means, and applying a vibration applying force capable of suppressing the detected vibrations to said stationary induction apparatus by vibration applying means; wherein said method comprises the further steps of: energizing said vibration applying means; receiving detected amplitude values of the vibrations from a plurality of vibration sensors constituting said vibration sensing means; calculating the sum of the squares of said amplitude values of vibration; and varying the phase and amplitude of the vibration applying force outputted from said vibration applying means in the direction of decreasing the calculated sum of the squares of amplitude values of vibration.

Claim 8

A method for reducing vibrations generated in a stationary induction apparatus comprising the steps of detecting the vibrations by a plurality of vibration sensors disposed at a plurality of positions of said apparatus, and applying vibration applying forces capable of suppressing the detected vibrations to said stationary induction apparatus by a plurality of vibration applying devices, wherein said method further comprises the steps of: energizing all of said vibration applying devices; frequency-analyzing amplitude values of vibration respectively detected by said plurality of vibration sensors, in succession and in a predetermined order, to successively store said amplitude values in a state that each of said amplitude values is separated into a plurality of frequency components; calculating, for each of said frequency components, the sum of the squares of all the stored amplitude value frequency components when all of said amplitude values detected by said vibration sensors have been stored in said state, and comparing the results of calculation with the previously stored preceding results of calculation of the sum of the squares; updating the contents of storage by substituting said previously stored preceding results of calculation by the present results of calculation; determining present instruction values with respect to the phase and amplitude of a vibration applying source of a vibration applying device selected in a predetermined order from said plurality of vibration applying devices, on the basis of the previously stored preceding instruction values with respect to the phase and amplitude of the vibration applying force of said selected vibration applying device and said present results of calculation of the sum of the squares; updating the contents of storage by substituting said previously stored preceding instruction values by the present instruction values; adjusting the phase and amplitude of the vibration applying force of said selected vibration applying device on the basis of said present instruction values; and selecting said vibration applying devices in succession in said predetermined order to repeat said steps mentioned above.

Claim 9

A method for reducing vibrations generated in a stationary induction apparatus comprising the steps of detecting the vibrations by a plurality of vibration sensors disposed at a plurality of positions of said apparatus, and applying vibration applying forces capable of suppressing the detected vibrations to said stationary induction apparatus by a plurality of vibration applying devices, wherein said method further comprises the steps of: energizing all of said vibration applying devices; frequency-analyzing amplitude values of vibration respectively detected by said plurality of vibration sensors, in succession and in a predetermined order, to successively store said amplitude values in a state that each of said amplitude values is separated into a plurality of frequency components; calculating, for each of said frequency components, the sum of the squares of all the stored amplitude value frequency components when all of said amplitude values detected by said vibration sensors have been stored in said state, and comparing the results of calculation with the previously stored preceding results of calculation of the sum of the squares; updating the contents of storage by substituting said previously stored preceding results of calculation by the present results of calculation; determining present instruction values with respect to the phase and amplitude of a vibration applying source of a vibration applying device selected in a predetermined order from said plurality of vibration applying devices, on the basis of the previously stored preceding instruction values with respect to the phase and amplitude of the vibration applying force of said selected vibration applying device and said present results of calculation of the sum of the squares; updating the contents of storage by substituting said previously stored preceding instruction values by the present instruction values; adjusting the phase and amplitude of the vibration applying force of said selected vibration applying device on the basis of said present instruction values; and selecting said vibration applying devices in succession in said predetermined order to repeat said steps mentioned above.

Claim 10

An apparatus for reducing vibrations generated in a stationary induction apparatus, including a plurality of vibration sensors for detecting the vibrations, at least one vibration applying device for applying counter-vibrations to said stationary induction apparatus to cancel said vibrations of said stationary induction apparatus, and control means for controlling the force of said counter-vibrations on the basis of outputs of said vibration sensors, wherein said control means includes means for obtaining the sum of the squares of the amplitudes of vibrations detected by said vibration sensors, and force adjusting means responsive to the obtained sum of the squares for adjusting the phase and amplitude of the counter-vibrations of said vibration applying device in the direction of decreasing said sum of the squares.

Claim 11

An apparatus for reducing vibrations generated in a stationary induction apparatus, including a plurality of vibration sensors for detecting the vibrations, at least one vibration applying device for applying counter-vibrations to said stationary induction apparatus to cancel said vibrations of said stationary induction apparatus, and control means for controlling the force of said counter-vibrations on the basis of outputs of said vibration sensors, wherein said control means includes means for obtaining the sum of the squares of the amplitudes of vibrations detected by said vibration sensors, and force adjusting means responsive to the obtained sum of the squares for adjusting the phase and amplitude of the counter-vibrations of said vibration applying device in the direction of decreasing said sum of the squares.

Claim 14

An apparatus for reducing vibrations generated in a stationary induction apparatus, comprising a plurality of vibration sensors for detecting the vibrations, at least one vibration applying device for applying a vibration applying force capable of suppressing said vibrations to said stationary induction apparatus, and control means for controlling said vibration applying force on the basis of the respective outputs of said vibration sensors, wherein said control means includes a microcomputer having a predetermined program for sequentially and cyclically performing an operation for obtaining the sum of the squares of the respective amplitudes of vibration detected by said vibration sensors and another operation for adjusting the phase and amplitude of said vibration applying force of said vibration applying device in accordance with said sum of the squares.

Claim 15

An apparatus for reducing vibrations generated in a stationary induction apparatus, comprising a plurality of vibration sensors for detecting the vibrations, at least one vibration applying device for applying a vibration applying force capable of suppressing said vibrations to said stationary induction apparatus, and control means for controlling said vibration applying force on the basis of the respective outputs of said vibration sensors, wherein said control means includes a microcomputer having a predetermined program for sequentially and cyclically performing an operation for obtaining the sum of the squares of the respective amplitudes of vibration detected by said vibration sensors and another operation for adjusting the phase and amplitude of said vibration applying force of said vibration applying device in accordance with said sum of the squares.