Design of polymer-based mechanical filters for shock-measurement accelerometers

S. Olutunde Oyadiji; K. T. Feroz; Geoffrey R. Tomlinson

doi:10.1117/12.239098

1 May 1996 Design of polymer-based mechanical filters for shock-measurement accelerometers

S. Olutunde Oyadiji, K. T. Feroz, Geoffrey R. Tomlinson

Proceedings Volume 2720, Smart Structures and Materials 1996: Passive Damping and Isolation; (1996) https://doi.org/10.1117/12.239098
Event: 1996 Symposium on Smart Structures and Materials, 1996, San Diego, CA, United States

Abstract

Shock measurement accelerometers require protection from the high frequency components of input shock spectra which often cause irreversible damage to these transducers. The resonance frequencies of shock accelerometers are usually designed to be much greater than the highest frequency of their operating range. It is not unusual, however, for input shock waveforms to contain spectral components whose frequencies are much greater than the resonance frequencies of shock accelerometers. This is particularly true for shock waveforms of very short duration whose shape approach that of the classical Dirac delta function. Consequently, there is a need for mechanical filters which will isolate the accelerometers from the highest frequency components of shock loadings applied to structures. In this paper, the design of a mechanical filter comprised of metal discs, metal housing and viscoelastic elements is examined using the finite element method. The transformation of the frequency domain complex Young's modulus data to the time domain extensional relaxation function using collocation method is described. The procedures for the derivation of the Prony series coefficients from the time data for input into the finite element analysis code are presented. It is shown that effective mechanical filters can be designed using viscoelastic materials of optimal properties.

Citation Download Citation

S. Olutunde Oyadiji, K. T. Feroz, and Geoffrey R. Tomlinson "Design of polymer-based mechanical filters for shock-measurement accelerometers", Proc. SPIE 2720, Smart Structures and Materials 1996: Passive Damping and Isolation, (1 May 1996); https://doi.org/10.1117/12.239098

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