Analysis of the influence of shaker table rigidity on the accuracy of vibration test results for electronic equipment
DOI:
https://doi.org/10.31891/2079-1372-2023-110-4-13-21Keywords:
vibration test, shaker, test fixtures, electronic equipmentAbstract
During vibration tests of structurally complex equipment on electrodynamic shakers, the measured vibrations on the shaker table, test fixtures and various places of the tested product may differ. One of the reasons is the deformable shaker table, the stiffness of which can significantly affect the results of vibration tests. The electronic equipment being tested, as a rule, does not have an axisymmetric shape and therefore, during testing, it is very difficult to align the center of gravity of the product and the vibrating table or equipment with the axis passing through the center of the shaker table. The paper theoretically shows that the shaker table can be considered a rigid body only if there is no displacement of the weight of the tested product from the center of the table, as well as at excitation frequencies significantly lower than the critical frequency of the table. For theoretical analysis, the disc-shaped shaker table is presented in the form of a thin plate. Vibrography of the vibrating platform experimentally confirmed the effect of increasing vibrations when moving away from the center of the shaker table. If during vibration tests it is not possible to place the electronic unit coaxially with the center of the vibrating table, it is necessary to monitor the value of vibrations at different points of the tested product, for example, at the points farthest from the center.
References
Veeramuthuvel, P., Shankar, K., Sairajan, K. K. (2016). Experimental investigation of particle damper-based vibration suppression in printed circuit board for spacecraft applications. Proceedings of the Institution of Mechanical Engineers, Part g: Journal of Aerospace Engineering 230.7, 1299-1311
https://doi.org/10.1177/0954410015607552
Galler D., Slenski, G. (1991). Causes of aircraft electrical failures. IEEE Aerospace and Electronic Systems Magazine, 6(8), 3-8, https://doi.org/10.1109/62.90949
ISO 5344:2004, Electrodynamic test equipment for generating vibration — methods of describing equipment characteristics, International Organization for Standardization, Switzerland, (2004)
Lang, G. F., Snyder, D. (2001). Understanding the physics of electrodynamic shaker performance. Sound and vibration, 35(10), 24-33.
Shuster, M., Briano, B., Kitchin, Ch. (2002). Mounting considerations for ADXL series accelerometers. AN-379, Analog Devices Application Note
Dal, H., Baklaci, M. (2019). Design, fabrication and vibration analysis of a lightweight head expander for a high frequency electrodynamic shaker. Materials Testing, 61(10), pp. 965-972.
https://doi.org/10.3139/120.111407
Avitabile, P. (1999). Why you can't ignore those vibration fixture resonances. Sound and Vibration, 33, 20-27.
Kovtun, I., Boiko, J., Petrashchuk, S. (2019). Assessing Enclosure Case Design on Excitation and Transmission of Vibration in Electronic Packages. In 2019 IEEE 2nd Ukraine Conference on Electrical and Computer Engineering (UKRCON), IEEE, 265-270
https://doi.org/10.1109/UKRCON.2019.8879782
Waimer, S., Manzato, S., Peeters, B., Wagner, M., & Guillaume, P. (2016). Numerical modelling and simulation of a closed-loop electrodynamic shaker and test structure model for spacecraft vibration testing. In Proceedings of the European Conference of Spacecraft Structures, Materials and Environmental Testing, Toulouse, France.
Waimer, S., et al. (2016). A multiphysical modelling approach for virtual shaker testing correlated with experimental test results. Special Topics in Structural Dynamics, Volume 6. Springer, Cham, 87-99.
Zuo, S., Feng, Z., Pan, J., & Wu, X. (2020). Electromechanical coupling dynamic modeling and analysis of vertical electrodynamic shaker considering low frequency lateral vibration. Advances in Mechanical Engineering, 12(10), 1687814020963851
Hoffait, S., Marin, F., Simon, D., Peeters, B., Golinval, J. C. (2016). Measured-based shaker model to virtually simulate vibration sine test. Case Studies in Mechanical Systems and Signal Processing, 4, 1-7
Waimer, S., Manzato, S., Peeters, B., Wagner, M., Guillaume, P. (2018). Modelling and simulation of a closed-loop electrodynamic shaker and test structure model for spacecraft vibration testing. Advances in Aircraft and Spacecraft Science. 5(2), 205-223
Siswanto, W. A., Ibrahim, M. N., Madlan, M. A., & Mohamad, S. M. (2011). Shaker Table Design for Electronic Device Vibration Test System. International Journal of Engineering and Technology, 3(6), 663
http://dx.doi.org/10.7763/IJET.2011.V3.302
Timoshenko, S., Woinowsky-Krieger, S. (1959). Theory of plates and shells. Vol. 2. New York: McGraw-hill
