SAE J1637 Vibration Damping Round Robin Study

Moritz, Charles T.; Deshpande, Satyajeet P.

doi:10.4271/2017-01-1881

Cited by 2 publications

References 5 publications

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A Novel Wave Propagation Method for Measuring Viscoelastic Properties of Prestrained Materials

Lemerle

2021

Journal of Applied Mechanics

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Viscoelastic materials are widely used for vibroacoustic solutions due to their ability to mitigate vibration and sound. Wave propagation methods are based on the measurement of the waveform pattern of a transitory pulse in one-dimensional structures. The time evolution of the pattern can be used to deduce the material elasticity and damping characteristics. The most popular propagation methods, namely Hopkinson bar methods, assume no dispersion, i.e. the complex elasticity modulus is not frequency-dependent. This is not significant for resilient materials such as elastomers. More recent approaches have been developed to measure frequency-dependent properties from a pulse propagating in a slender bar. We showed in previous works how to adapt these techniques for shorter samples of materials, representing a real advance, as extrusion is a cumbersome process for many materials. The main concept was to reconstruct the time history of the wave propagating in a composite structure composed of a long incident bar made of a known material and extended by a shorter sample bar. Then the viscoelastic properties of the sample material were determined in the frequency domain within an inverse method held in the time domain. In industry, most isolation solutions using mounts or bushings must support structural weights. This is why it is particularly interesting to know the viscoelastic properties of the material in stressed state. Here, we show how to overcome this challenging issue. The theoretical framework of the computational approach is detailed and the method is experimentally verified.

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A Novel Wave Propagation Method for Measuring Viscoelastic Properties of Prestrained Materials

Lemerle

2021

Journal of Applied Mechanics

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SAE J1637 Vibration Damping Round Robin Study: Summary and Conclusions

Deshpande¹,

Moritz²

2023

SAE Technical Paper Series

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<div class="section abstract"><div class="htmlview paragraph">As part of the update process to SAE J1637, “Laboratory Measurement of the Composite Vibration Damping Properties of Materials on a Supporting Steel Bar”, the Acoustical Materials Committee commissioned a round robin study to determine the current laboratory-to-laboratory variation, and to better understand best practices for composite loss factor measurements. Guidance within the current standard from a previous round robin study indicates a coefficient of variation of 35% for laboratory-to-laboratory measurements. It was hoped that current instrumentation and test practices would yield lower variability. Over the course of 5 years, 10 separate laboratories tested 4 bars: three damped steel bars and one bare steel bar. The bars were tested at -20°C, -5°C, 10°C, 25°C, 40°C, and 55°C. The damping materials were intentionally selected to provide low damping, moderate damping, and high damping to illustrate difficulties in determining the composite loss factor with increased damping. Additionally, the differences between automated and manual data acquisition systems and contact and non-contact transducers are reviewed. The results of this study were used for the 2021 update to the SAE J1637 standard.</div></div>

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SAE J1637 Vibration Damping Round Robin Study

Cited by 2 publications

References 5 publications

A Novel Wave Propagation Method for Measuring Viscoelastic Properties of Prestrained Materials

A Novel Wave Propagation Method for Measuring Viscoelastic Properties of Prestrained Materials

SAE J1637 Vibration Damping Round Robin Study: Summary and Conclusions

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