06.12.2012 Views

Experimental Study of Wire Brush Brake Noise on a Personal Car

Experimental Study of Wire Brush Brake Noise on a Personal Car

Experimental Study of Wire Brush Brake Noise on a Personal Car

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<str<strong>on</strong>g>Brake</str<strong>on</strong>g> Pad Vibrati<strong>on</strong>s<br />

-Increasing Increasing Roller Speed<br />

•Increased vibrati<strong>on</strong> levels<br />

with increased roller speed<br />

•Fundamental shape <str<strong>on</strong>g>of</str<strong>on</strong>g><br />

spectra NOT intact<br />

•“Flatter” Flatter frequency<br />

resp<strong>on</strong>se<br />

•Peaks intact with<br />

iincreasing i roller ll speedd<br />

s 2<br />

1 μm/s<br />

dB re.<br />

Level<br />

90<br />

88<br />

86<br />

84<br />

82<br />

80<br />

78<br />

76<br />

74<br />

72<br />

NB! <str<strong>on</strong>g>Brake</str<strong>on</strong>g> force 70<br />

unchanged (if<br />

2.9 [km/h]<br />

1.9 [km/h]<br />

1.3 [km/h]<br />

68<br />

100 200 300 400 500 600 700 800<br />

Coulomb fricti<strong>on</strong>)<br />

12<br />

Frequency [Hz]<br />

B<str<strong>on</strong>g>Brake</str<strong>on</strong>g> k pressure, 5 [b [bar]<br />

]

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