Vibrator controlling method and vibrator

A vibrator having a driving means equipped with an electric-to-mechanical converting mechanism for generating a driving force corresponding to the amplitude of an electric control signal received and a vibrating member driven for vibration by the driving force of the driving means, wherein the vibrating member is vibrated by the driving means fed with the electric control signal, which corresponds to the amplitude of vibrations at a vibration source, to generate a vibrating force for actively suppressing the vibrations at the vibration source, comprising:

• a reference pulse signal producing means for producing the reference pulse signal of a duty ratio synchronized with an input pulse signal correlated in the frequency with the vibrations at the vibration source;
• a carrier signal producing means for producing a carrier signal of which the frequency is higher than the frequency of the reference pulse signal while correlating and substituting the control amplitude with the duty ratio to correspond to the amplitude of the vibrations at the vibration source;
• and
• an electric control signal producing means for producing the electric control signal by superimposing the carrier signal on the reference pulse signal while allowing each pulse of the electric control signal, produced by superimposing pulses of the carrier signal on pulses of the reference pulse signal, to have the first spike increased greater in width than the other spikes.

A vibrator having a driving means equipped with an electric-to-mechanical converting mechanism for generating a driving force corresponding to the amplitude of an electric control signal received and a vibrating member driven for vibration by the driving force of the driving means, wherein the vibrating member is vibrated by the driving means fed with the electric control signal, which corresponds to the amplitude of vibrations at a vibration source, to generate a vibrating force for actively suppressing the vibrations at the vibration source, comprising:

• a reference pulse signal producing means for producing a reference pulse signal having a given duty ratio and synchronized with an input pulse signal correlated in the frequency with the vibrations at the vibration source;
• a third electric control signal producing means for producing a electric control signal by providing at least one off intervals of a predetermined random timing and random width on each pulse of the reference pulse signal to correlate the control amplitude with the amplitude of the vibrations at the vibration source;
• a second storage means for mapping and storing a plurality of the control signals which have been produced by the reference signal producing means and the third electric control signal producing means from the input pulse signals correlated in the frequency with the vibrations at the vibration source;
• a second electric control signal read-out means responsive to the input pulse signal for reading its corresponding electric control signal out from the second storage means so that the electric control signal read out by the second electric control signal read-out means is applied to the driving means.

A method of controlling a pneumatic vibrator which has an air-tightly enclosed air chamber and a switching means provided across an air flow passage communicated to the air chamber for switching between two pneumatic pressure sources for supply of different pressures to communicate with the air chamber, wherein the air chamber is varied in the inner pressure by operating the switching means to produce a vibrating force for actively suppressing vibrations at a vibration source to be controlled, comprising the steps of:

• producing a reference pulse signal of a duty ratio synchronized with an input pulse signal correlated in the frequency with the vibrations at the vibration source;
• producing a carrier signal of which the frequency is higher than the frequency of the reference pulse signal while correlating and substituting the control amplitude with the duty ratio to correspond to the amplitude of the vibrations at the vibration source;
• and
• producing the control signal by superimposing the carrier signal on the reference pulse signal while allowing each pulse of the control signal, produced by superimposing pulses of the carrier signal on pulses of the reference signal, to have the first spike increased greater in width than the other spikes so that the switching action of the switching means can be controlled by the control signal.

A pneumatic vibrator having an air-tightly enclosed air chamber and a switching means provided across an air flow passage communicated to the air chamber for switching between two different pneumatic pressure sources to communicate with the air chamber, wherein the air chamber is varied in the inner pressure by operating the switching means to produce a vibrating force for actively suppressing vibrations at a vibration source to be controlled, comprising:

• a reference pulse signal producing means for producing a reference pulse signal of a duty ratio synchronized with an input pulse signal correlated in the frequency with the vibrations at the vibration source;
• a carrier signal producing means for producing a carrier signal of which the frequency is higher than the frequency of the reference pulse signal while correlating and substituting the control amplitude with the duty ratio to correspond to the amplitude of the vibrations at the vibration source;
• a control signal producing means for producing the control signal by superimposing the carrier signal on the reference pulse signal while allowing each pulse of the control signal, produced by superimposing pulses of the carrier signal on pulses of the reference signal, to have the first spike increased greater in width than the other spikes;
• and
• a switching control means responsive to the control signal produced by the control signal producing means for controlling the switching action of the switching means.

A pneumatic vibrator having an air-tightly enclosed air chamber and a switching means provided across an air flow passage communicated to the air chamber for switching between two pneumatic pressure sources for supply of different pressures to communicate with the air chamber, wherein the air chamber is varied in the inner pressure by operating the switching means to produce a vibrating force for actively suppressing vibrations at a vibration source to be controlled, comprising:

• a reference pulse signal producing means for producing a reference pulse signal having a given duty ratio and synchronized with an input pulse signal correlated in the frequency with the vibrations at the vibration source;
• a third control signal producing means for producing a control signal by providing at least one off intervals of a predetermined random timing and random width on each pulse of the reference pulse signal to correlate the control amplitude with the amplitude of the vibrations at the vibration source;
• a second storage means for mapping and storing a plurality of the control signals which have been produced by the reference signal producing means and the third control signal producing means from the input pulse signals correlated in the frequency with the vibrations at the vibration source;
• a second control signal read-out means responsive to the input pulse signal for reading its corresponding control signal out from the second storage means;
• and
• a second switching control means responsive to the control signal read out by the second control signal read-out means for controlling the switching action of the switching means.

A method of controlling an electromagnetic vibrator which has a driving means equipped with an electric-to-mechanical converting mechanism for generating a driving force corresponding to the amplitude of an electric control signal received and a vibrating member driven for vibration by the driving force of the driving means, wherein the vibrating member is vibrated by the driving means fed with the electric control signal, which corresponds to the amplitude of vibrations at a vibration source, to generate a vibrating force for actively suppressing the vibrations at the vibration source, comprising the steps of:

• producing a reference pulse signal of a duty ratio synchronized with an input pulse signal correlated in the frequency with the vibrations at the vibration source;
• producing a carrier signal of which the frequency is higher than the frequency of the reference pulse signal while correlating and substituting the control amplitude with the duty ratio to correspond to the amplitude of the vibrations at the vibration source;
• and
• producing the electric control signal by superimposing the carrier signal on the reference pulse signal while allowing each pulse of the electric control signal, produced by superimposing pulses of the carrier signal on pulses of the reference pulse signal, to have the first spike increased greater in width than the other spikes.

An electromagnetic vibrator having a driving means equipped with an electric-to-mechanical converting mechanism for generating a driving force corresponding to the amplitude of an electric control signal received and a vibrating member driven for vibration by the driving force of the driving means, wherein the vibrating member is vibrated by the driving means fed with the electric control signal, which corresponds to the amplitude of vibrations at a vibration source, to generate a vibrating force for actively suppressing the vibrations at the vibration source, comprising:

• a reference pulse signal producing means for producing the reference pulse signal of a duty ratio synchronized with an input pulse signal correlated in the frequency with the vibrations at the vibration source;
• a carrier signal producing means for producing a carrier signal of which the frequency is higher than the frequency of the reference pulse signal while correlating and substituting the control amplitude with the duty ratio to correspond to the amplitude of the vibrations at the vibration source;
• and
• an electric control signal producing means for producing the electric control signal by superimposing the carrier signal on the reference pulse signal while allowing each pulse of the electric control signal, produced by superimposing pulses of the carrier signal on pulses of the reference pulse signal, to have the first spike increased greater in width than the other spikes.

An electromagnetic vibrator having a driving means equipped with an electric-to-mechanical converting mechanism for generating a driving force corresponding to the amplitude of an electric control signal received and a vibrating member driven for vibration by the driving force of the driving means, wherein the vibrating member is vibrated by the driving means fed with the electric control signal, which corresponds to the amplitude of vibrations at a vibration source, to generate a vibrating force for actively suppressing the vibrations at the vibration source, comprising:

• a reference pulse signal producing means for producing a reference pulse signal having a given duty ratio and synchronized with an input pulse signal correlated in the frequency with the vibrations at the vibration source;
• a third electric control signal producing means for producing a electric control signal by providing at least one off intervals of a predetermined random timing and random width on each pulse of the reference pulse signal to correlate the control amplitude with the amplitude of the vibrations at the vibration source;
• a second storage means for mapping and storing a plurality of the control signals which have been produced by the reference signal producing means and the third electric control signal producing means from the input pulse signals correlated in the frequency with the vibrations at the vibration source;
• a second electric control signal read-out means responsive to the input pulse signal for reading its corresponding electric control signal out from the second storage means so that the electric control signal read out by the second electric control signal read-out means is applied to the driving means.