Ships{3 {0 stabilizer control systems

Claim 2

A ship''s stabilizer control system comprising a first channel adapted to provide a first carrier at the frequency of the ship''s normal electrical supply modulated with a first control signal for the control of torque-producing means; a second channel comprising a modulator means adapted to provide an intermediate carrier at a higher frequency modulated with the first control signal, and including means for providing from said intermediate carrier a second carrier at the frequency of the ship''s normal electrical supply modulated with a second control signal for the control of the torque-producing means; and means whereby said first and second control signals may be combined to form a composite control signal for the control of the torque-producing means.

Claim 3

A ship''s stabilizer control system comprising a first channel adapted to operate at the frequency of the ship''s normal electrical supply for the production of a first control signal for the control of torque-producing means, a sensing means for the production of a roll signal corresponding to a first roll variable, a second channel comprising a modulator means adapted to operate with a carrier at a higher frequency, the modulate modulator means being coupled to the sensing means so that in use the output of the modulator means is a signal at the higher frequency modulated by the first roll variable, computing means for the computation from the first roll variable of a signal corresponding to at least one further roll variable, said computing means being coupled to said modulator means, the said signal corresponding to at least one further roll variable constituting a second control signal for the control of the torque-producing means, and means whereby the said first and second control signals may be combined to form a composite control signal for the control of the torque-producing means.

Claim 4

A ship''s stabilizer control system comprising a first channel adapted to operate at the frequency of the ship''s normal electrical supply for the production of a first control signal for the control of torque-producing means, a sensing means for the production of a roll signal corresponding to a first roll variable, a second channel comprising a modulator means adapted to operate with a carrier at a higher frequency, the modulate modulator means being coupled to the sensing means so that in use the output of the modulator means is a signal at the higher frequency modulated by the first roll variable, computing means for the computation from the first roll variable of a signal corresponding to at least one further roll variable, said computing means being coupled to said modulator means, the said signal corresponding to at least one further roll variable constituting a second control signal for the control of the torque-producing means, and means whereby the said first and second control signals may be combined to form a composite control signal for the control of the torque-producing means.

Claim 5

The ship''s stabilizer control system as claimed In claim 2 in which the sensing means is such as to produce in use a signal in proportion to the angular velocity of roll , so that the first roll variable is , and in which the computing means comprises an integrator and a differentiator for the respective integration and differentiation of to produce roll angle theta and roll acceleration , the latter constituting second and third roll variables and being constituents of the composite signal for the control of the torque producing means.

Claim 6

The ship''s stabilizer control system as claimed in claim 3 in which the sensing means comprises a gyroscope, the modulator means comprises a first synchrotransmitter mechanically coupled to the gyroscope, and in which a demodulator is provided via which the first synchrotransmitter is coupled to the integrator and the differentiator.

Claim 7

A ship''s stabilizer control system; comprising a first channel adapted to operate with a carrier at the frequency of the ship''s normal electrical supply for the production of a first control signal for the control of torque-producing means; a second channel comprising a modulator means adapted to operate with a carrier at a higher frequency for the production of a second control signal for the control of the torque-producing means; means whereby said first and second control signals may be combined to form a composite control signal for the control of the torque-producing means, and list correction means such that list of the ship which may be present may be balanced out. 6 A ship''s stabilizer control system comprising a first channel adapted to operate at the frequency of the ship''s normal electrical supply for the production of a first control signal for the control of torque-producing means, a sensing means for the production of a roll signal corresponding to a first roll a variable, a second channel comprising a modulator means adapted to operate with a carrier at a higher frequency, the modulator means being coupled to the sensing means so that in use the modulator means is a signal at the higher frequency modulated by the first roll variable, computing means for the computation from the first roll variable of a signal corresponding to at least one further roll variable, said computing means being coupled to said modulator means, said signal corresponding to at a least one further roll variable constituting a second control signal for the control of the torque-producing means, means whereby said first and second control signals may be combined to form a composite control signal for the control of the torque-producing means, said sensing means being such as to produce in use a signal in proportion to the angular velocity of roll so that the first roll variable is , the computing means including an integrator and a differentiator for the respective integration and differentiation of to produce roll angle theta and roll acceleration the latter constituting second and third roll variables and being constituents of the composite signal for the control of the torque-producing means, said sensing means including a gyroscope, the modulator means being defined by a first synchrotransmitter mechanically coupled to the gyroscope, a demodulator by which the first synchrotransmitter is coupled to the integrator and the differentiator, list correction means such that list of the ship which may be present may be balanced out, and the list correction means comprising a heavily damped pendulum and a second synchrotransmitter for operation at the frequency of the ship''s normal electrical supply, the second synchrotransmitter being coupled to the pendulum so that in use the output of the second synchrotransmitter constitutes a list signal characterizing any list of the ship which may be present, the list signal being combined with the first and second control signals to constitute a component of the composite control signal for the control of the torque-producing means.

Claim 8

A ship''s stabilizer control system; comprising a first channel adapted to operate with a carrier at the frequency of the ship''s normal electrical supply for the production of a first control signal for the control of torque-producing means; a second channel comprising a modulator means adapted to operate with a carrier at a higher frequency for the production of a second control signal for the control of the torque-producing means; means whereby said first and second control signals may be combined to form a composite control signal for the control of the torque-producing means, and list correction means such that list of the ship which may be present may be balanced out. 6 A ship''s stabilizer control system comprising a first channel adapted to operate at the frequency of the ship''s normal electrical supply for the production of a first control signal for the control of torque-producing means, a sensing means for the production of a roll signal corresponding to a first roll a variable, a second channel comprising a modulator means adapted to operate with a carrier at a higher frequency, the modulator means being coupled to the sensing means so that in use the modulator means is a signal at the higher frequency modulated by the first roll variable, computing means for the computation from the first roll variable of a signal corresponding to at least one further roll variable, said computing means being coupled to said modulator means, said signal corresponding to at a least one further roll variable constituting a second control signal for the control of the torque-producing means, means whereby said first and second control signals may be combined to form a composite control signal for the control of the torque-producing means, said sensing means being such as to produce in use a signal in proportion to the angular velocity of roll so that the first roll variable is , the computing means including an integrator and a differentiator for the respective integration and differentiation of to produce roll angle theta and roll acceleration the latter constituting second and third roll variables and being constituents of the composite signal for the control of the torque-producing means, said sensing means including a gyroscope, the modulator means being defined by a first synchrotransmitter mechanically coupled to the gyroscope, a demodulator by which the first synchrotransmitter is coupled to the integrator and the differentiator, list correction means such that list of the ship which may be present may be balanced out, and the list correction means comprising a heavily damped pendulum and a second synchrotransmitter for operation at the frequency of the ship''s normal electrical supply, the second synchrotransmitter being coupled to the pendulum so that in use the output of the second synchrotransmitter constitutes a list signal characterizing any list of the ship which may be present, the list signal being combined with the first and second control signals to constitute a component of the composite control signal for the control of the torque-producing means.

Claim 9

The shIp''s stabilizer control system as claimed in claim 6 in which said first channel for operation at the frequency of the ship''s normal electrical supply comprises a third synchrotransmitter coupled to said gyroscope so that the output of the third synchrotransmitter is in use in proportion to , and in which the means whereby said first and second control signals may be combined comprises an AC amplifier with an input coupled to said third synchrotransmitter of the first channel, to the second synchrotransmitter of the pendulum, and to an electronic modulator with an input coupled to the differentiator and to the integrator.

Claim 10

A ship''s stabilizer control system comprising: a first channel adapted to operate with a carrier at the frequency of a ship''s normal electrical supply for the production of a first control signal for the control of torque-producing means, a second channel comprising a modulator means adapted to operate with a carrier at a higher frequency for the production of a second control signal for the control of the torque-producing means; means whereby said first and second control signals may be combined to form a composite control signal for the control of the torque-producing means; and list correction means such that list of the ship which may be present may be balanced out, said list correction means including a heavily damped pendulum and a synchrotransmitter for operation at the frequency of the ship''s normal electrical supply, said synchotransmitter being coupled to the pendulum so that in use the output of said synchrotransmitter constitutes a list signal characterizing any list of the ship which may be present, the list signal being combined with the first and second control signals to constitute a component of a composite control signal for the control of the torque-producing means.

Claim 11

A ship''s stabilizer control system comprising: a first channel adapted to operate with a carrier at the frequency of a ship''s normal electrical supply for the production of a first control signal for the control of torque-producing means, a second channel comprising a modulator means adapted to operate with a carrier at a higher frequency for the production of a second control signal for the control of the torque-producing means; means whereby said first and second control signals may be combined to form a composite control signal for the control of the torque-producing means; and list correction means such that list of the ship which may be present may be balanced out, said list correction means including a heavily damped pendulum and a synchrotransmitter for operation at the frequency of the ship''s normal electrical supply, said synchotransmitter being coupled to the pendulum so that in use the output of said synchrotransmitter constitutes a list signal characterizing any list of the ship which may be present, the list signal being combined with the first and second control signals to constitute a component of a composite control signal for the control of the torque-producing means.