An investigation of the role of surface irregularities in the noise spectrum of rolling and sliding contacts
TL;DR: In this article, the role of surface irregularities in the production of noise in rolling and sliding contacts was investigated and the noise spectra of rolling contacts were recorded in a small free-field chamber which was specially designed.
About: This article is published in Wear.The article was published on 1982-12-15. It has received 17 citations till now. The article focuses on the topics: Noise (radio).
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TL;DR: Vibration measurement in both time and frequency domains along with signal processing techniques such as the high-frequency resonance technique have been covered and recent trends in research on the detection of defects in bearings have been included.
1,229 citations
TL;DR: An overview of the acoustics of friction is presented by covering friction sounds, friction-induced vibrations and waves in solids, and descriptions of other frictional phenomena related to acoustic.
Abstract: This article presents an overview of the acoustics of friction by covering friction sounds, friction-induced vibrations and waves in solids, and descriptions of other frictional phenomena related to acoustics. Friction, resulting from the sliding contact of solids, often gives rise to diverse forms of waves and oscillations within solids which frequently lead to radiation of sound to the surrounding media. Among the many everyday examples of friction sounds, violin music and brake noise in automobiles represent the two extremes in terms of the sounds they produce and the mechanisms by which they are generated. Of the multiple examples of friction sounds in nature, insect sounds are prominent. Friction also provides a means by which energy dissipation takes place at the interface of solids. Friction damping that develops between surfaces, such as joints and connections, in some cases requires only microscopic motion to dissipate energy. Modeling of friction-induced vibrations and friction damping in mechanical systems requires an accurate description of friction for which only approximations exist. While many of the components that contribute to friction can be modeled, computational requirements become prohibitive for their contemporaneous calculation. Furthermore, quantification of friction at the atomic scale still remains elusive. At the atomic scale, friction becomes a mechanism that converts the kinetic energy associated with the relative motion of surfaces to thermal energy. However, the description of the conversion to thermal energy represented by a disordered state of oscillations of atoms in a solid is still not well understood. At the macroscopic level, friction interacts with the vibrations and waves that it causes. Such interaction sets up a feedback between the friction force and waves at the surfaces, thereby making friction and surface motion interdependent. Such interdependence forms the basis for friction-induced motion as in the case of ultrasonic motors and other examples. Last, when considered phenomenologically, friction and boundary layer turbulence exhibit analogous properties and, when compared, each may provide clues to a better understanding of the other.
481 citations
01 Aug 2001
TL;DR: Algorithms for real-time synthesis of realistic sound effects for interactive simulations (e.g., games) and animation are described that are efficient, physically-based, and can be controlled by users in natural ways.
Abstract: We describe algorithms for real-time synthesis of realistic sound effects for interactive simulations (e.g., games) and animation. These sound effects are produced automatically, from 3D models using dynamic simulation and user interaction. We develop algorithms that are efficient, physically-based, and can be controlled by users in natural ways. We develop effective techniques for producing high quality continuous contact sounds from dynamic simulations running at video rates which are slow relative to audio synthesis. We accomplish this using modal models driven by contact forces modeled at audio rates, which are much higher than the graphics frame rate. The contact forces can be computed from simulations or can be custom designed. We demonstrate the effectiveness with complex realistic simulations.
328 citations
Cites background from "An investigation of the role of sur..."
...In [1] the role of surface irregularities in the production of noise in rolling and sliding contacts was investigated....
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TL;DR: In this paper, the authors used acoustic signals (sound) acquired from near field area of bearings in good and simulated faulty conditions for the purpose of fault diagnosis through machine learning approach.
123 citations
TL;DR: In this article, the authors present a tutorial overview of bearing vibration signature analysis as a medium for fault detection, and an explanation for the causes for the defects is discussed, as well as recent trends in research on the detection of the defects in bearings have been included.
Abstract: Rolling element bearings find widespread domestic and industrial application. Defects in bearing unless detected in time may lead to malfunctioning of the machinery. Different methods are used for detection and diagnosis of the bearing defects. This paper is intended as a tutorial overview of bearing vibration signature analysis as a medium for fault detection. An explanation for the causes for the defects is discussed. Vibration measurement in both time domain and frequency domain is presented. Recent trends in research on the detection of the defects in bearings have been included.
106 citations
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TL;DR: A further extension of such sound monitoring is the possible use of acoustic emissions as a means of determining production efficiency and product quality as mentioned in this paper, where the sounds produced by a machine result from the dynamics of its components and by regularly monitoring these sounds such changes as occur can be used to diagnose the condition of the machine and the possible onset of faults and failure
Abstract: Noises from machinery can be environmentally undesirable and in need of suppression. Yet the sounds produced by a machine result from the dynamics of its components and by regularly monitoring these sounds such changes as occur can be used to diagnose the condition of the machine and the possible onset of faults and failure. A further extension of such sound monitoring is the possible use of acoustic emissions as a means of determining production efficiency and product quality.
13 citations