IEST RP-DTE022 1-2014 Multi-shaker Test and Control.pdf
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1、 Institute of Environmental Sciences and Technology IEST-RP-DTE022.1 Design, Test, and Evaluation Division Recommended Practice 022.1 Multi-shaker Test and Control Arlington Place One 2340 S. Arlington Heights Road, Suite 620 Arlington Heights, IL 60005-4510 Phone: (847) 981-0100 Fax: (847) 981-4130
2、 E-mail: informationiest.org Web: www.iest.org IEST-RP-DTE022.1:Multi-shaker Test and Control IEST Recommended Practices License Agreement for Electronic Documents You have purchased a non-revisable Adobe Acrobat PDF file that can be stored on your personal computer. You have purchased a document wh
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6、ces and Technology (IEST) does not warrant that the content of the document is accurate or up to date or that the document will be suitable for your purposes. To the extent allowed in applicable law, in no event shall IEST be liable for any direct, indirect, punitive, incidental, special, consequent
7、ial damages, or any damages whatsoever arising out of or connected with the use or misuse of this document, with the limit of the refund of the price of the purchased document. This transaction is governed by and construed in accordance with the laws of Illinois of the United States. IEST General Co
8、pyright Statement The use of IEST Recommended Practices is subject to the users acceptance of IESTs terms of use and conditions of copyright for IEST publications, as set out below. All IEST Publications are protected by copyright. Therefore, and unless otherwise specified, no part of an IEST Public
9、ation may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying, microfilm, and scanning, without permission in writing from the publisher. While all reasonable care is taken in the preparation and review of Recommended Practices, the Institute of En
10、vironmental Sciences and Technology (IEST) does not warrant that the content of the document is accurate or up to date or that the document will be suitable for your purposes. To the extent allowed in applicable law, in no event shall IEST be liable for any direct, indirect, punitive, incidental, sp
11、ecial, consequential damages, or any damages whatsoever arising out of or connected with the use or misuse of this document, with the limit of the refund of the price of the purchased document. This transaction is governed by and construed in accordance with the laws of Illinois of the United States
12、. If you have any difficulties concerning the above terms, any questions regarding copyright, or have a request for permission, please contact IEST at the following address: IEST Arlington Place One 2340 S. Arlington Heights Road, Suite 620 Arlington Heights, IL 60005-4510 Tel (847) 981-0100 Fax (84
13、7) 981-4130 E-mail copyrightiest.org Web www.iest.org2 IEST 2014 All rights reserved Institute of Environmental Sciences and Technology IEST-RP-DTE022.1 This Recommended Practice was prepared by and is under the jurisdiction of Working Group 22 of the IEST Design, Test, and Evaluation Division (WG-D
14、TE022). The following WG voting members contributed to the development of this edition of this Recommended Practice. Tony Keller, WG-DTE022 Chair, Spectral Dynamics Brad Allen, Moog CSA Robert L. (Andy) Anderson, National Technical Systems Russ Ayres, Spectral Dynamics David Banaszak, US Air Force R
15、esearch Laboratory Richard Cellary, NSWC IHEODTD Naval PHST Center William H. Connon III, US Army Aberdeen Test Center Michael T. Hale, Redstone Test Center Joel Hoksbergen, Team Corporation Samuel Kouretas, NSWC IHEODTD DET PICATINNY Randy Patrick, Army Yuma Test Center Stanley Poynor, Lockheed Mar
16、tin Missiles on measured field vibration data; or on a combination of those two specifications? The answer to this question will determine the complexity of the test, what kind of data will be required, and how much, if any, off-line processing of field data will be necessary. IEST-RP-DTE022.1 Insti
17、tute of Environmental Sciences and Technology IEST 2014 All rights reserved 9 As described in section 5.3, a multiple-shaker test setup may involve a complex UUT, some fixturing, bearings to permit the desired motion and protect the shakers, the exciters, power amplifiers, transducers, and cables. T
18、his combination is best defined in a matrix formulation, relating inputs and outputs as an SDM. If measured field vibration data will be used, it is critical to have good phase and coherence measurements in addition to measured PSD values (see Appendix B: Underwood, Ayres, and Keller, 2009). Conside
19、r, for example, a test of an aircraft missile that is secured under a wing by two attachment points. Field measurements may include magnitude, phase, and coherence values between two points measured near the missile attachment points. If the exciters are to be attached directly to the missile attach
20、ment points, most of the required information may be available. However, if the laboratory simulation is to take place with shakers attached to the aircraft fuselage or wheel carriages, information about the frequency response functions between fuselage excitation points and missile control points w
21、ill also be necessary. The available data must be sufficient to fill in the entire system matrix to achieve successful simulation using field data. 5.3 Theory Many multi-shaker vibration tests are performed on the basis of having one control accelerometer per shaker. This setup is termed “square con
22、trol” and assumes N control points for N shakers. Additional channels may also be available for response measurements and limit control of amplitudes without affecting phase parameters. Controlling multiple shakers simultaneously requires an understanding that the drive signal to any one shaker will
23、 have an effect on all control points, not just the point nearest the shaker being driven. Thus, the solution of a multi-shaker control problem is best defined in matrix terms, involving all drive and control signals simultaneously. Figure 1 shows a block concept of a typical four-shaker excitation
24、and control system. In a controlled test environment, the drive signals will come from the multi-shaker digital vibration control system (MSDVCS) and the control signals (shown in Figure 1 as response vectors) will be fed back to the MSDVCS. The relationship between these signals, described as a com
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