Experimental Mechanics

, Volume 48, Issue 5, pp 683–692 | Cite as

A Simple Closed-Loop Active Control of Electrodynamic Shakers by Acceleration Power Spectral Density for Environmental Vibration Tests

  • H. M. Gomes
  • D. dos Santos Gaspareto
  • F. de Souza Ferreira
  • C. A. K. Thomas
BRIEF TECHNICAL NOTE

Abstract

This work presents the main results of a simple closed-loop active control for an electrodynamic shaker in order to generate acceleration Power Spectral Densities (PSD) according to prescribed Standards used in environmental vibration tests. The main idea is to start generating acceleration pseudo-signals obeying the prescribed Power Spectral Density and then to acquire acceleration data from the electrodynamic shaker’s table behaviour. So the Power Spectral Density of the acquired acceleration is computed and compared with the required PSD and then the time-varying pseudo-acceleration is updated to reflect this corrected PSD. It was noticed that for piecewise narrow bands frequencies, the electrodynamic shaker acceleration behaves near linearly, both in frequency and voltage, for the input signals. A code in AgilentVee 7.5 software to acquire, send and process signals for the active control in a closed-loop scheme was developed. The used A/D D/A hardware was a single PC sound card with specific characteristics. The control could be accomplished sending and acquiring at the same time with a range of input/output of ±1.5 V with 16 bits of resolution, at 48 kHz and assistance of an external sound amplifier.

Keywords

Active control Electrodynamic shaker Power spectral density Sound card 

References

  1. 1.
    Fujita M, Uchiyama Y (2005) Robust Acceleration and Displacement Control of Electrodynamic Shaker. Internal Report, Department of Mechanical and Control Engineering, Tokyo Institute of Technology, Tokyo.Google Scholar
  2. 2.
    JESD22-B103B (2006) Vibration, Variable Frequency, (revision of jesd22-b103-a), JEDEC Solid State Technology Association, June.Google Scholar
  3. 3.
    ISO 5344 (2004) Electrodynamic vibration generating systems—Performance characteristics. International Organization for Standardization, 1995.Google Scholar
  4. 4.
    BS EN 60255-21-1, Electrical Relays Part 21 (1996) Vibration, Shock, Bump and Seismic Tests on Measuring Relays and Protection Equipment Section 1: Vibration Tests (Sinusoidal). British Standards Institution, September 15.Google Scholar
  5. 5.
    TS-6330 (1989) Basic Environmental Testing Procedures for Electronic Components and Electronic Equipment: Mounting Methods for Shock (Ea), Bump (Eb), Vibration (Fc and Fd) and Steady-State Acceleration (Ga) and similar Dynamic Tests, Turkish Standards Institution.Google Scholar
  6. 6.
    McConnell KG (1995) Vibration testing: Theory and Practice. Wiley, New York, p 605.MATHGoogle Scholar
  7. 7.
    Agilent Vee Pro 7.5 (2005a) Agilent VEE Pro User’s Guide, Agilent Technologies, Inc., 9th Edition, p 626, May.Google Scholar
  8. 8.
    Agilent Vee Pro 7.5 (2005b) VEE Pro Advanced Programming Techniques, Agilent Technologies, Inc., 9th Edition, p 612, May.Google Scholar
  9. 9.
    AG 801-01/ No. 8M A0 0 (2004) Electric and Electronic Assemblies in Motor Vehicles: General Test Conditions. Volkswagen Standard July, p 46.Google Scholar
  10. 10.
    Cavalieri HM, Cavalca KL (2004) Desenvolvimento e Implementação de um Programa para Geração de Sinal de Alimentação de Excitador Eletromecânico (Shaker) em Plataforma Labview (In Portuguese). XXII Congresso Interno de Iniciação Científica da Unicamp, Brazil.Google Scholar
  11. 11.
    Uchiyama Y, Mukai M, Fujitac M (2006) Robust control of electrodynamic shaker by 2DOF control using H Filter. Internal Report, Department of Mechanical and Control Engineering, Tokyo Institute of Technology, Meguro-ku, Tokyo.Google Scholar
  12. 12.
    Salehzadeh-Nobari S, Chambers JA, Green TC, Goodfellow JK, Smith WED (1997) Implementation of Frequency Domain Adaptive Control in Vibration Test Products, In Proceedings of the 5th International Conference on Factory2000, No. 435, Imperial College, England, pp 263–268.Google Scholar
  13. 13.
    Flora LD, Gründling HA (2006) Acceleration Control of an Inverter-Fed Electrodynamic Shaker. In Proceedings of the 37th IEEE Power Electronics Specialists Conference, Jeju, Korea, pp 2799–2805.Google Scholar
  14. 14.
    Moutinho C, Cunha A, Caetano E (2004) Controlo Activo de uma Plataforma Vibratória para Excitação Sísmica de Modelos Laboratoriais,(in Portuguese). In Proceedings of the SÍSMICA 2004—6° Congresso Nacional de Sismologia e Engenharia Sísmica, Portugal, pp 611–620.Google Scholar
  15. 15.
    Newland DE (1984) In: Longman Scientific and Technical (ed) An introduction to random vibrations and spectral analysis. Wiley, New York, p 375.MATHGoogle Scholar
  16. 16.
    7IIEC 60068-2-6 (1995) International Electro technical Commission, Environmental Testing-Part 2: Tests-Test FC: Vibration (Sinusoidal) Ed. 6.0b.Google Scholar
  17. 17.
    Analog Devices (1998) ±5 g to ±50 g, Low Noise, Low Power, Single/Dual Axis iMEMSÒ Accelerometers, ADXL150/ADXL250, One Technology Way, P.O. Box 9106, U.S.A.Google Scholar

Copyright information

© Society for Experimental Mechanics 2008

Authors and Affiliations

  • H. M. Gomes
    • 1
  • D. dos Santos Gaspareto
    • 2
  • F. de Souza Ferreira
    • 1
  • C. A. K. Thomas
    • 1
  1. 1.UFRGS, Universidade Federal do Rio Grande do Sul, Programa de Pós Graduação em Engenharia MecânicaPorto AlegreBrazil
  2. 2.UERGS, Universidade Estadual do Rio Grande do SulNovo HamburgoBrazil

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