Method and apparatus for adjusting vibration frequency of vibrating object

Claim 1

A method for conducting stepwise adjustment of the vibration frequency of a vibrating object by operating a vibration frequency varying means connected to said vibrating object to make said vibration frequency of said vibrating object substantially equal to a reference frequency, comprising the steps of: a. measuring the vibration frequency of said vibrating object; b. operating said vibrating frequency varying means by an increment to cause the vibrating frequency to change and measuring the resulting vibration frequency of the vibrating object; c. stopping the operating step whenever the difference between said resulting vibration frequency measured in a preceding step of operating and the reference frequency is smaller than a certain predetermined permissible frequency error; d. continuing to operate, whenever said difference is not smaller than said certain permissible frequency error, said vibration frequency varying means to cause the vibrating frequency to successively change by a present increment determined by: the past increment in the immediately prior step of operating, the frequency representing the difference between the vibration frequencies of the vibrating object before and after said immediately prior step of operating said vibration frequency varying means, and the frequency deviation representing that frequency difference relative to the reference frequency still remaining after the immediately prior step of operating; and e. repeating steps (c) through (d) until the vibration frequency of the vibrating object becomes substantially equal to the frequency.

Claim 2

A method for conducting stepwise adjustment of the vibration frequency of a vibrating object by operating a vibration frequency varying means connected to said vibrating object to make said vibration frequency of said vibrating object substantially equal to a reference frequency, comprising the steps of: a. measuring the vibration frequency of said vibrating object; b. operating said vibrating frequency varying means by an increment to cause the vibrating frequency to change and measuring the resulting vibration frequency of the vibrating object; c. stopping the operating step whenever the difference between said resulting vibration frequency measured in a preceding step of operating and the reference frequency is smaller than a certain predetermined permissible frequency error; d. continuing to operate, whenever said difference is not smaller than said certain permissible frequency error, said vibration frequency varying means to cause the vibrating frequency to successively change by a present increment determined by: the past increment in the immediately prior step of operating, the frequency representing the difference between the vibration frequencies of the vibrating object before and after said immediately prior step of operating said vibration frequency varying means, and the frequency deviation representing that frequency difference relative to the reference frequency still remaining after the immediately prior step of operating; and e. repeating steps (c) through (d) until the vibration frequency of the vibrating object becomes substantially equal to the frequency.

Claim 5

An apparatus for conducting stepwise adjustment of the vibration frequency f p of a vibrating object to make said vibration frequency f p substantially equal to a reference frequency f s through an adjusting process consisting of a number i of steps of operating a vibration frequency varying means through the increments Δθ 1 which are calculated in accordance with the equation: Δθ.sub.i = K.sub.i (f.sub.s - f.sub.pi-1) . . . (1) wherein: i represents an integer indicating the number of a given operating step; Δθ i represents the increment to be carried out by said vibration frequency varying means in the i-th operating step; f pi-1 represents the resulting vibration frequency in the (i-1)th operating step; K i represents the constant employed in the calculation of the i-th operating step; the constant K 1 for the first (i=1) adjusting step being predetermined; the constant K.sub. i (i=2, 3, . . .) for the second and subsequent adjusting steps being calculated in accordance with the equation: ##EQU8## wherein: Δθ i-1 represents the increment to be carried out by said vibration frequency varying means in the (i-1)th operating step; f pi-1 represents the resulting vibration frequency in the (i-1)th operating step; f pi-2 represents the resulting vibration frequency in the (1-2)th operating step; said apparatus comprising: means for causing vibration of said vibrating object; means for detecting said vibration of said vibrating object; control means for, upon receipt of the output of said detecting means measuring the vibration frequency of the vibrating object, generating a signal corresponding toa the measured vibration frequency, upon receipt of an external start signal prior to conducting said first (i=1) adjusting step, actuating said vibration-causing means to cause vibration of said vibrating object and, thereafter, detecting the end of each operation to actuate said vibration-causing means; a calculating unit including means for setting said reference vibration frequency f.sub. s and said first constant K 1 , K i calculating means for, upon receipt of the aforesaid signal generated from said control means and corresponding to said measured vibration frequency, calculating the constant K i (i=2, 3, . . .) for the second (i=2) and subsequent (i=3, 4, . . .) operating steps in accordance with equation (2), and Δθ i calculating means for calculating in accordance with equation (1) that increment for the respective operating steps (i=1, 2, 3, . . .); and operating means which, upon receipt of the output of the Δθ i calculating means of said calculating unit, operates the vibration frequency varying means through an amount Δθ i calculated by said Δθ i calculating means, said operating process being stopped whenever the difference between the resulting vibration frequency in the nearest prior operating step and said referency frequency is smaller than a predetermined permissible frequency error set error.

Claim 6

An apparatus for conducting stepwise adjustment of the vibration frequency f p of a vibrating object to make said vibration frequency f p substantially equal to a reference frequency f s through an adjusting process consisting of a number i of steps of operating a vibration frequency varying means through the increments Δθ 1 which are calculated in accordance with the equation: Δθ.sub.i = K.sub.i (f.sub.s - f.sub.pi-1) . . . (1) wherein: i represents an integer indicating the number of a given operating step; Δθ i represents the increment to be carried out by said vibration frequency varying means in the i-th operating step; f pi-1 represents the resulting vibration frequency in the (i-1)th operating step; K i represents the constant employed in the calculation of the i-th operating step; the constant K 1 for the first (i=1) adjusting step being predetermined; the constant K.sub. i (i=2, 3, . . .) for the second and subsequent adjusting steps being calculated in accordance with the equation: ##EQU8## wherein: Δθ i-1 represents the increment to be carried out by said vibration frequency varying means in the (i-1)th operating step; f pi-1 represents the resulting vibration frequency in the (i-1)th operating step; f pi-2 represents the resulting vibration frequency in the (1-2)th operating step; said apparatus comprising: means for causing vibration of said vibrating object; means for detecting said vibration of said vibrating object; control means for, upon receipt of the output of said detecting means measuring the vibration frequency of the vibrating object, generating a signal corresponding toa the measured vibration frequency, upon receipt of an external start signal prior to conducting said first (i=1) adjusting step, actuating said vibration-causing means to cause vibration of said vibrating object and, thereafter, detecting the end of each operation to actuate said vibration-causing means; a calculating unit including means for setting said reference vibration frequency f.sub. s and said first constant K 1 , K i calculating means for, upon receipt of the aforesaid signal generated from said control means and corresponding to said measured vibration frequency, calculating the constant K i (i=2, 3, . . .) for the second (i=2) and subsequent (i=3, 4, . . .) operating steps in accordance with equation (2), and Δθ i calculating means for calculating in accordance with equation (1) that increment for the respective operating steps (i=1, 2, 3, . . .); and operating means which, upon receipt of the output of the Δθ i calculating means of said calculating unit, operates the vibration frequency varying means through an amount Δθ i calculated by said Δθ i calculating means, said operating process being stopped whenever the difference between the resulting vibration frequency in the nearest prior operating step and said referency frequency is smaller than a predetermined permissible frequency error set error.