skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Multiple Shaker Random Vibration Control--An Update

Abstract

The theory of the control of multiple shakers driving a single test item is reviewed. Several improvements that have been introduced since the original papers on the subject will be discussed. The improvements include: (1) specification of the control spectra; (2) the control of non-square systems (the number of shakers does not have to be equal to the number of control points); (3) the connection between sine testing, waveform control, and random control; (4) improvements in feedback control; (5) overlap-add versus time domain randomization; and (6) reproduction of non-Gaussian waveforms.

Authors:
Publication Date:
Research Org.:
Sandia National Labs., Albuquerque, NM (US); Sandia National Labs., Livermore, CA (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
3874
Report Number(s):
SAND98-2044C
TRN: AH200113%%48
DOE Contract Number:
AC04-94AL85000
Resource Type:
Conference
Resource Relation:
Conference: Institute of Environmental Sciences and Technology (IEST) Annual Meeting, Ontario, CA (US), 05/02/1999; Other Information: PBD: 18 Feb 1999
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; MEASURING METHODS; MEASURING INSTRUMENTS; ACCURACY; SPECIFICATIONS; MIXERS; CONTROL EQUIPMENT

Citation Formats

Smallwood, D.O.. Multiple Shaker Random Vibration Control--An Update. United States: N. p., 1999. Web.
Smallwood, D.O.. Multiple Shaker Random Vibration Control--An Update. United States.
Smallwood, D.O.. Thu . "Multiple Shaker Random Vibration Control--An Update". United States. doi:. https://www.osti.gov/servlets/purl/3874.
@article{osti_3874,
title = {Multiple Shaker Random Vibration Control--An Update},
author = {Smallwood, D.O.},
abstractNote = {The theory of the control of multiple shakers driving a single test item is reviewed. Several improvements that have been introduced since the original papers on the subject will be discussed. The improvements include: (1) specification of the control spectra; (2) the control of non-square systems (the number of shakers does not have to be equal to the number of control points); (3) the connection between sine testing, waveform control, and random control; (4) improvements in feedback control; (5) overlap-add versus time domain randomization; and (6) reproduction of non-Gaussian waveforms.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Feb 18 00:00:00 EST 1999},
month = {Thu Feb 18 00:00:00 EST 1999}
}

Conference:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share:
  • Abstract not provided.
  • Abstract not provided.
  • This paper describes a multiple shaker control system developed at Sandia National Laboratories for driving a single test item with random excitation. The system allows for cross-coupled mechanical systems with partially coherent control points. The system uses time-domian randomization to generate the continuous Gassian drive signals.
  • This paper develops an algorithm for a multiple shaker random vibration control system. The system is designed for several shakers driving a single test item with full cross-coupling control. The method allows for cross-coupled mechanical systems with partially coherent control points. This report extends a previous paper in the following respects. The algorithm corrects both the auto spectra and the cross spectra of the control points in closed loop. Multiple-shaker control systems require the inversion of the system frequency response function matrix. When this matrix is singular or near singular, large errors can result. Under these conditions, procedures are developedmore » for calculating a pseudo inverse. This paper also includes a discussion of the time randomization procedure used to provide a true random output.« less
  • Multiple-actuator shaker systems are commonly used in the shock and vibration testing of large test specimens. Structural resonances in the fixturing or test specimen can lead to large inter-actuator or cross-coupling forces which have a degrading effect on the accuracy and stability of the control system. A previous paper formulated the theoretical basis for multiple-actuator-shaker control and reported on an electrohydraulic-shaker digital-control system then under development at Lawrence Livermore Laboratory (LLL). The theoretical basis is reviewed and the implementation and performance characteristics of the completed LLL system are described.