scholarly journals Characteristics of Friction Noise with Changes of the Natural Frequencies in the Reciprocating Motion

2014 ◽  
Vol 24 (4) ◽  
pp. 332-338 ◽  
Author(s):  
Hoil Choi ◽  
Jaeyoung Kang
Keyword(s):  
Natural Frequencies ◽  
Reciprocating Motion ◽  
Friction Noise

Rotation of Clamped Parts due to Reciprocating Motion

1996 ◽  
Vol 63 (3) ◽  
pp. 610-620
Author(s):  
E. S. Edelstein ◽  
J. J. Blech
Keyword(s):  
Natural Frequencies ◽  
Mechanical Systems ◽  
Ball Bearings ◽  
Environmental Condition ◽  
Reciprocating Motion ◽  
Stick Slip ◽  
Contact Areas ◽  
Spherical Cavities ◽  
Fatigue Failures ◽  
Slip Motion

Cylindrical and spherical parts, clamped in mechanical systems, rotate when the system is subjected to a dynamic reciprocating environmental condition. This rotation is a combination of the clamped part high “receptance” magnification near its natural frequencies, with frictional stick-slip at the clamping contact areas, when the system is excited to a reciprocating motion not collinear with the preloading direction. Such rotation may result in wear and fatigue failures in those systems, due to the rotation and the slip motion involved. Three cases are analyzed: cylindrical pins in hinges, balls in ball bearings, and spherical vessels clamped between spherical cavities.

Rotation of a Clamped Spherical Ball due to Linear Reciprocating Motion

1996 ◽  
Vol 63 (3) ◽  
pp. 683-691 ◽  
Author(s):  
E. S. Edelstein ◽  
J. J. Blech
Keyword(s):  
Theoretical Analysis ◽  
Ball Bearing ◽  
Natural Frequencies ◽  
Theoretical Explanation ◽  
Reciprocating Motion ◽  
Rolling Bearings ◽  
Stick Slip ◽  
Spherical Ball ◽  
Clamping System ◽  
Slip Motion

A perfect spherical ball, symmetrically clamped between two identical surfaces, was found to rotate due to linear reciprocating excitation. A plausible theoretical explanation of this phenomenon follows. The rotation of the ball is a combination of the magnification of the dynamic response of the ball in the clamping system, near its natural frequencies, with frictional stick-slip at the contact areas. The ball rotates when the system is excited by a reciprocating motion not collinear with the preloading direction. The theoretical analysis of such rotation was corroborated by testing. This rotation may result in wear because of the slip motion involved. This work is focused on balls clamped between spherical (concave) surfaces. However, such rotation can also be developed in cylindrical hinges and rolling bearings, naturally loaded between a pair of surfaces. Furthermore, rotation of balls may develop in a nonrotating ball bearing under dynamic environmental conditions.

Tire Vibrations

1977 ◽  
Vol 5 (4) ◽  
pp. 202-225 ◽  
Author(s):  
G. R. Potts ◽  
C. A. Bell ◽  
L. T. Charek ◽  
T. K. Roy
Keyword(s):  
Natural Frequencies ◽  
Standing Waves ◽  
Resonant Mode ◽  
Mode Shapes ◽  
Resonant Vibrations ◽  
Resonant Frequencies ◽  
Radial Tire ◽  
Analysis Techniques ◽  
Thin Ring ◽  
Good Agreement

Abstract Natural frequencies and vibrating motions are determined in terms of the material and geometric properties of a radial tire modeled as a thin ring on an elastic foundation. Experimental checks of resonant frequencies show good agreement. Forced vibration solutions obtained are shown to consist of a superposition of resonant vibrations, each rotating around the tire at a rate depending on the mode number and the tire rotational speed. Theoretical rolling speeds that are upper bounds at which standing waves occur are determined and checked experimentally. Digital Fourier transform, transfer function, and modal analysis techniques used to determine the resonant mode shapes of a radial tire reveal that antiresonances are the primary transmitters of vibration to the tire axle.

CALCULATION OSCILLATIONS OF VARIOUS ELEMENTS OF THE ELASTIC SYSTEM OF THE CENTER-FREE GRINDING MACHINE SASL 5AD

2020 ◽  
pp. 160-165
Author(s):  
Джугурян Т.Г. ◽  
Марчук В.І. ◽  
Марчук І. В.
Keyword(s):  
Horizontal Plane ◽  
Natural Frequencies ◽  
Elastic System ◽  
Experimental Studies ◽  
Piezoelectric Sensors ◽  
Forced Oscillations ◽  
Method Of Calculation ◽  
Vibration Resistance ◽  
Grinding Machine ◽  
Experimental Researches

During the design of operations of centerless intermittent grinding of surfaces there is a need to identify the natural frequencies of oscillations of the elements of the technological system of grinding. The method of calculation of rigidity, vibration resistance and forced oscillations of the elements of the circular grinding machine is offered in the article. Carrying out of experimental researches of rigidity of elastic system of the SASL 5AD grinding machine. We conducted preliminary experimental studies to measure the oscillations of various elements of the elastic system of the SASL 5AD grinding machine in the horizontal plane by piezoelectric sensors during grinding with continuous and discontinuous circles with different geometric parameters.

Computation of Natural Frequencies of Planar Lattice Structure.

1987 ◽  
Author(s):  
James H. Williams ◽  
Nagem Jr. ◽  
Raymond J.
Keyword(s):  
Natural Frequencies ◽  
Lattice Structure ◽  
Planar Lattice
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