Residual vibrations can be greatly reduced by using specially-shaped reference command signals. Input shaping is one such technique that reduces vibration by convolving a sequence of impulses with any desired reference command. Several types of useful impulse sequences have been developed. Most of these have contained only positively valued impulses. However, rise time can be improved by using some negative impulses in the sequence. Unfortunately, the use of negative impulses can excite unmodeled high modes. A new type of impulse sequence containing negative impulses is proposed. These sequences are designed to fill the performance gap between all-positive impulse sequences and the negative sequences previously developed. A proof governing the worst case scenario provides an upper bound on high-mode excitation. The resulting class of impulse sequences allows the designer to make a precise trade off between rise time and vibration reduction.
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March 2004
Technical Briefs
Reference Command Shaping Using Specified-Negative-Amplitude Input Shapers for Vibration Reduction
William Singhose,
William Singhose
Department of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332 USA
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Erika Ooten Biediger,
Erika Ooten Biediger
Department of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332 USA
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Ye-Hwa Chen,
Ye-Hwa Chen
Department of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332 USA
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Bart Mills
Bart Mills
Sony Corporation, Springfield, OR 97477
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William Singhose
Department of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332 USA
Erika Ooten Biediger
Department of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332 USA
Ye-Hwa Chen
Department of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332 USA
Bart Mills
Sony Corporation, Springfield, OR 97477
Contributed by the Dynamic Systems, Measurement, and Control Division of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS for publication in the ASME JOURNAL OF DYNAMIC SYSTEMS, MEASUREMENT, AND CONTROL. Manuscript received by the ASME Dynamic Systems and Control Division January 21, 2002; final revision, July 16, 2003. Associate Editor: R. Ghulil.
J. Dyn. Sys., Meas., Control. Mar 2004, 126(1): 210-214 (5 pages)
Published Online: April 12, 2004
Article history
Received:
January 21, 2002
Revised:
July 16, 2003
Online:
April 12, 2004
Citation
Singhose , W., Ooten Biediger , E., Chen , Y., and Mills , B. (April 12, 2004). "Reference Command Shaping Using Specified-Negative-Amplitude Input Shapers for Vibration Reduction ." ASME. J. Dyn. Sys., Meas., Control. March 2004; 126(1): 210–214. https://doi.org/10.1115/1.1650385
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