Band limited control of a flexible structure using piecewise tri

Details Band limited control of a flexible structure using piecewise tri Band limited control of a flexible structure using piecewise tri

1993-05-11

1995-11-07

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

Adaptive or optimizing systems including 'bang-bang' servos

318778, 318274, G11B 555

Patent

active

054650356

ABSTRACT:
A method and apparatus for moving a member provides parameters related to a given destination position of the member and corresponding to a switch time, a final time, an acceleration amplitude, and a deceleration amplitude. These parameters are used to specify a piecewise continuous function of time as an input signal. The input signal feeds a motor to move the member. The final time, switch time, acceleration amplitude, and deceleration amplitude are specified by iteratively providing minimal values for the switch time and final time while providing maximum acceptable values for the acceleration amplitude and deceleration amplitude for each possible given change in a characteristic of the movable member. A pre-shaped input signal is thereby provided which is bandwidth limited such that its energy is concentrated below the frequency of the lowest system resonance, since the signal is a piecewise continuous function comprising concatenated raised cosine and constant functions. The input signal may be asymmetrical and may have acceleration and deceleration amplitudes which differ in magnitude, and thus is useful in systems where it is desirable to the limit frequency content of an input signal while compensating for the effects of back EMF voltage. Since only four parameters are needed to specify the input signal, the signal is easy to construct, and it thus practical for use in high density disk drive applications.

REFERENCES:
patent: 4342379 (1982-08-01), Games et al.
patent: 4488189 (1984-12-01), Axmear et al.
patent: 4491776 (1985-01-01), Veale
patent: 4532463 (1985-07-01), Tanaka
patent: 4777609 (1988-10-01), Cavill et al.
patent: 5073748 (1991-12-01), Boehm
patent: 5111349 (1992-05-01), Moon
patent: 5119250 (1992-06-01), Green et al.
patent: 5121327 (1992-06-01), Salazar
patent: 5225757 (1993-07-01), Burtie
patent: 5254920 (1993-10-01), Agarwal et al.
patent: 5331263 (1994-07-01), Sagae et al.
Singer, N. C. and Seering, W. P., "Preshaping Command Inputs to Reduce System Vibration," Transactions of the ASME, vol. 112, Mar. 1990, pp. 76-82.
Meckl, P. H. and Seering, W. P., "Minimizing Residual Vibration for Point-to-Point Motion," Transactions of the ASME, vol. 107, Oct. 1985, pp. 378-382.
Meckl, Peter Heinrich, "Control of Vibration in Mechanical Systems Using Shaped Reference Inputs," PhD thesis, Department of Mechanical Engineering, MIT, 1988, also AI-TR-1030, The Artifical Intelligence Laboratory, Massachusetts Institute of Technology, Cambridge, Mass.

Affiliated with

Also associated with

Rating

Band limited control of a flexible structure using piecewise tri does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Band limited control of a flexible structure using piecewise tri, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Band limited control of a flexible structure using piecewise tri will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-198990