This paper presents friction frequency response measurements taken from a planar steel contact subjected to controlled random broadband normal vibration. Data are included from both dry and various lubricated contact conditions under different vibration input levels and different sliding velocities. Frequency response data for dry contacts are found to have nearly steady magnitude and negligible phase lag over a relatively wide range of frequencies. This suggests a coefficient of friction, independent of frequency but dependent on levels of normal acceleration and sliding velocity, may adequately define the dry contact frequency response. The frequency response data for lubricated contacts are mixed. For example, with MoS2 grease the frequency response may adequately be defined by a constant, as with dry conditions. However, frequency response data for contacts with pure mineral oils, mineral oils with additives, and lithium grease are found to be dependent on frequency. [S0742-4787(11)00101-9]

1.
Tolstoi
,
D. M.
,
1967
, “
Significance of the Normal Degree of Freedom and Natural Normal Vibrations in Contact Friction
,”
Wear
,
10
, pp.
199
213
.
2.
Jarvis
,
R. P.
, and
Mills
,
B.
,
1963
, “
Vibrations Induced by Dry Friction
,”
Proceedings of the Institution of Mechanical Engineers
,
178
, pp.
847
866
.
3.
Godfrey
,
D.
,
1967
, “
Vibration Reduces Metal to Metal Contact and Causes an Apparent Reduction in Friction
,”
ASLE Transactions
,
10
, pp.
183
192
.
4.
Soom
,
A.
, and
Kim
,
C.
,
1983
, “
Roughness-Induced Dynamic Loading at Dry and Boundary Lubricated Sliding Contacts
,”
ASME J. Lubr. Technol.
,
105
, pp.
514
517
.
5.
Soom
,
A.
, and
Kim
,
C.
,
1983
, “
Interactions Between Dynamic Normal and Frictional Forces During Unlubricated Sliding
,”
ASME J. Lubr. Technol.
,
105
, pp.
221
229
.
6.
Sakamoto
,
T.
,
1987
, “
Normal Displacement and Dynamic Friction Characteristics in a Stick-Slip Process
,”
Tribol. Int.
,
20
, pp.
25
31
.
7.
Hess, D. P., and Soom, A., 1992, “Unsteady Friction in the Presence of Vibrations,” in Fundamentals of Friction, Kluwer Academic, The Netherlands, pp. 535–552.
8.
Kilburn
,
R. F.
,
1974
, “
Friction Viewed a Random Process
,”
ASME J. Lubr. Technol.
,
96
, No.
X
, pp.
291
299
.
9.
Yust
,
C. S.
,
1994
, “
Fast Fourier Transform Analysis of Computer-Acquired Friction Data
,”
STLE Tribol. Trans.
,
37
, pp.
201
205
.
10.
Popovic
,
M. R.
, and
Goldenberg
,
A. A.
,
1998
, “
Modeling of Friction Using Spectral Analysis
,”
IEEE Trans. Rob. Autom.
,
14
, pp.
114
122
.
11.
Bendat, J. S., and Piersol, A. G., 1993, Engineering Applications of Correlation and Spectral Analysis, 2nd Ed., Wiley-Interscience, New York.
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