Adaptive synchronous vibration suppression apparatus

• US 5,313,399 A
• Filed: 01/21/1992
• Issued: 05/17/1994
• Est. Priority Date: 01/21/1992
• Status: Expired due to Term

• Current Assignee: Charles Stark Draper Laboratory Incorporated
• Original Assignee: Charles Stark Draper Laboratory Incorporated
• Inventors: Beale, Stuart R.
• Primary Examiner(s): Black, Thomas G.
• Assistant Examiner(s): ZANELLI, MICHAEL J
• Application Number:
  US07/822,701
• Time in Patent Office: 847 Days
• Field of Search: 364/463, 364/508, 364/724.19, 364/726, 364/574, 364/576, 364/581, 364/148, 73/461, 73/593, 73/579, 73/662, 73/672, 73/468, 73/472, 73/480, 73/481, 73/486, 73/462, 310/90.5, 310/51, 318/629
• US Class Current: 701/124
• CPC Class Codes: F16C 32/0451 Details of controllers, i.e. the units determining the power to be supplied, e.g. comparing elements, feedback arrangements with P.I.D. control
• CPC Class Codes: F16F 15/027 comprising control arrangements F16F15/0237 takes precedence
• CPC Class Codes: G05D 19/02 characterised by the use of electric means
• CPC Class Codes: H02K 5/24 specially adapted for suppression or reduction of noise or vibrations
• CPC Class Codes: H02K 7/09 with magnetic bearings

Abstract

An adaptive synchronous vibration suppression apparatus for suppressing vibrations in a dynamic system subject to synchronous disturbance detects the energy representative of the synchronous component of the vibration induced by the synchronous disturbance; generates the Fourier coefficients, amplitude and phase components command; and applies the command to operate an actuator to apply a force to the system to suppress the detected vibration.

Claims

1. An adaptive forced balancing system for a rotor magnetic bearing suspension apparatus having a magnetic bearing control signal, comprising:

means, responsive to the magnetic bearing control signal, for detecting the energy representative of the mass-unbalance of the rotor;

means, responsive to said means for detecting, for computing two Fourier coefficients of the energy representative of the mass-unbalance of the rotor; and

means responsive to said means for computing said two Fourier coefficients, for generating a position command to the rotor magnetic bearing suspension apparatus to define the orbit of the geometric center of the rotor to effect rotation of the rotor about its center of mass.

2. The adaptive forced balancing system of claim 1 in which said means for detecting includes means for extracting the synchronous component of the magnetic bearing control signal;

means, responsive to said synchronous component, for producing the absolute value of said synchronous component; and

means, responsive to said absolute value of said synchronous component, for defining the average of said absolute value of said synchronous component.

3. The adaptive forced balancing system of claim 1 in which said means for generating a position command includes means responsive to said two Fourier coefficients, for calculating the quadrature components of the position command;

and means, responsive to said means for calculating, for summing the quadrature components to obtain the position command.

4. The adaptive forced balancing system of claim 3 in which said means for computing includes a channel for developing each of said Fourier coefficients, and switching means for selectively enabling one of said channels and disabling the other as a function of the value of the energy representative of the mass-unbalance of the rotor.

5. The adaptive forced balancing system of claim 4 in which said means for switching includes means for disabling the enabled channel and enabling the disabled channel when said energy value is increasing, concave upward, and a local extremum has been reached.

6. An adaptive forced balancing system for a rotor suspension apparatus having a suspension control signal, comprising:

means, responsive to the suspension control signal, for detecting the energy representative of the mass-unbalance of the rotor;

means, responsive to said means for detecting, for computing two Fourier coefficients of the energy representative of the mass-unbalance of the rotor; and

means, responsive to said means for computing said two Fourier coefficients, for generating a position command to the rotor suspension apparatus to define the orbit of the geometric center of the rotor to effect rotation of the rotor about its center of mass.

7. The adaptive forced balancing system of claim 6 in which said means for detecting includes means for extracting the synchronous component of the suspension control signal;

means, responsive to said synchronous component, for producing the absolute value of said synchronous component; and

means, responsive to said absolute value of said synchronous component, for defining the average of said absolute value of said synchronous component.

8. The adaptive forced balancing system of claim 6 in which said means for generating a position command includes means responsive to said two Fourier coefficients, for calculating the quadrature components of the position command;

and means, responsive to said means for calculating, for summing the quadrature components to obtain the position command.

9. The adaptive forced balancing system of claim 8 in which said means for computing includes a channel for developing each of said Fourier coefficients, and switching means for selectively enabling one of said channels and disabling the other as a function of the value of the energy representative of the mass-unbalance of the rotor.

10. The adaptive forced balancing system of claim 9 in which said means for switching includes means for disabling the enabled channel and enabling the disabled channel when said energy value is increasing, concave upward, and a local extremum has been reached.

11. An adaptive synchronous vibration suppression apparatus for suppressing vibrations in a dynamic system subject to synchronous disturbance, comprising:

means for detecting the energy representative of the synchronous component of the vibration induced by a synchronous disturbance including

means for extracting the synchronous component of the vibration,

means, responsive to said synchronous component, for producing the absolute value of said synchronous component, and

means, responsive to said absolute value of said synchronous component, for defining the average of said absolute value of said synchronous component;

means, responsive to said means for detecting, for generating a Fourier coefficients, amplitude and phase command based on said average of said absolute value of said synchronous component; and

actuator means, responsive to said command, for applying a force to the system to suppress the detected said vibration.

12. The adaptive synchronous vibration suppression apparatus of claim 11 in which said means for generating includes means for computing from the energy representative of the synchronous component of the vibration two Fourier coefficients of the command;

means, responsive to said Fourier coefficients, for calculating the quadrature components of the command; and

means, responsive to said means for calculating, for summing the quadrature components to obtain the command.

13. The adaptive synchronous vibration suppression apparatus of claim 12 in which said means for computing includes a channel for developing each of said Fourier coefficients, and switching means for selectively enabling one of said channels and disabling the other as a function of the value of the energy representative of the synchronous component of the vibration.

14. The adaptive synchronous vibration suppression apparatus of claim 13 in which said means for switching includes means for disabling the enabled channel and enabling the disabled channel when said energy value is increasing, concave upward, and a local extremum has been reached.

15. An adaptive forced balancing system for a rotor magnetic bearing suspension apparatus having a magnetic bearing control signal, comprising:

means, responsive to the magnetic bearing control signal, for detecting the energy representative of the mass-unbalance of the rotor; and

means, responsive to said means for detecting, for generating a position command to the rotor magnetic bearing suspension apparatus to define the orbit of the geometric center of the rotor to effect rotation of the rotor about its center of mass, including means for computing, from the energy representative of the mass-unbalance of the rotor, the Fourier coefficients of the position command, means, responsive to said Fourier coefficients, for calculating the quadrature components of the position command, and means, responsive to said Fourier coefficients, for calculating the quadrature components of the position command, and means, responsive to said means for calculating, for summing the quadrature components to obtain the position command.

16. An adaptive forced balancing system for a rotor suspension apparatus having a suspension control signal, comprising:

means, responsive to the suspension control signal, for detecting the energy representative of the mass-unbalance of the rotor; and

means, response to said means for detecting, for generating a position command to the rotor suspension apparatus to define the orbit of the geometric center of the rotor to effect rotation of the rotor about its center of mass, including means for computing, from the energy representative of the mass-unbalance of the rotor, the Fourier coefficients of the position command, means responsive to said Fourier coefficients, for calculating the quadrature components of the position commands, and means, responsive to said means for calculating, for summing the quadrature components to obtain the position command.