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Endurance Tests on a Colloidal Damper Destined to Vehicle Suspension

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Abstract

Endurance tests on a colloidal damper destined to vehicle suspension are performed. Such absorber represents an ecological application of nano-damping; it employs the hysteresis which occurs when water is forced to penetrate and then naturally exudes from a nanoporous silica gel matrix, modified to become liquid-repellent. Damping performances decrease at the increasing of the number of working cycles, partially since the silica gel grains that undergo gradual fatigue fracture are able to escape at the packing used to seal the test chamber, and partially due to the fatigue fracture alone, which is accompanied by an enhancement of the hydrophilic silanol groups on the silica gel surface and a pore size redistribution. In order to augment damper’s life, silica gel is introduced inside of a tank that is separated by a filter from the main cylinder, in which only water is supplied. One discusses the influence of filtration on the colloidal damper performances and the variation of damper’s life versus the ratio of filter pore’s diameter to the mean size of the silica gel particles.

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Abbreviations

c :

Cycles, [−]; Damping coefficient, \({E \mathord{\left/ {\vphantom {E {\left( {2\pi ^2 fS^2 } \right)}}} \right. \kern-\nulldelimiterspace} {\left( {2\pi ^2 fS^2 } \right)}}\) (N·s/m)

c f :

Contribution of the filter to the damping coefficient (N·s/m)

D :

Piston diameter (m)

E :

Dissipated energy (J)

E f :

Contribution of the filter to the dissipated energy (J)

f&f n :

Excitation and resonance frequencies (Hz)

h :

Length of the filter orifices (m)

M&M 0 :

Mass and initial mass of silica gel (g)

N&N cr :

Number and critical number of working cycles (c)

N max,min :

Maximum, minimum number of working cycles (c)

p&p c,d :

Pressure & compression, decompression pressures (Pa)

p f :

Pressurization to assure water passage through the filter (Pa)

r&R :

Radius of the silica gel nanopore and micro-particle (m)

R 0 :

Radius of the filter orifices (m)

S&S max :

Piston stroke and maximum piston stroke (m)

V :

Specific pore volume (ml/g)

α&β :

Exponents connected to the effect of fatigue fracture and colloid leakage (−)

δ :

Filter porosity (−)

μ :

Dynamic viscosity (Pa·s)

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Acknowledgements

Supports from the Ministry of Education and the Electronic Research Laboratory, Fukuoka Institute of Technology, as well as the assistance of Messrs. K. Shibata, K. Ajisaka and K. Itsuwa during the endurance tests performed on the proposed colloidal damper are acknowledged.

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Authors and Affiliations

  1. Department of Intelligent Mechanical Engineering, Fukuoka Institute of Technology, 3-30-1 Wajiro-Higashi, Higashi-ku, Fukuoka, 811-0295, Japan

    C. V. Suciu

  2. Mirai Team, Fuji Silysia Chemical Ltd., 1846-2 Kozoji, Kasugai, Aichi, 487-0013, Japan

    K. Yaguchi

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  1. C. V. Suciu
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Correspondence to C. V. Suciu.

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Suciu, C.V., Yaguchi, K. Endurance Tests on a Colloidal Damper Destined to Vehicle Suspension. Exp Mech 49, 383–393 (2009). https://doi.org/10.1007/s11340-008-9163-z

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