Development of a diagnosis technique for failures of V-belts by a cross-spectrum method and a discriminant function approach

Abstract

This paper describes the development of a failure diagnosis technique for V-belts through vibration monitoring. The V-belt vibration is monitored at a driven bearing body attached to a power transmission device. Seven basic causes of belt failure and their combinations are considered. Power spectra of the vibration data are calculated through noise reduction by a cross-spectnnn method. Six parameters characterizing the vibration data are extracted, and 16 typical combinations of the basic causes and a normal belt state are diagnosed successfully by a Bayes' discriminant function approach. Two types of incorrect diagnosis are examined: Type I leaves a failed belt not repaired, and type II causes overmaintenance. A risk ratio for the Bayes' discriminant function is determined to minimize the two types of incorrect diag-nosis. Moreover, the risk ratio is determined to minimize type I error.

Non-Contact Vibration Monitoring of Power Transmission Belts Through Electrostatic Sensing

“…The vibration dynamics of a travelling belt is determined by a variety of factors, including belt tension, axial speed, span length, viscoelastic stiffness and various mechanical abnormalities as described in [1]. In order to assess the measurement performance of the electrostatic sensor, the belt axial speed was varied and the vibration at the middle point of the belt span was monitored.…”

“…functionality of the mechanical system. Since some common operation abnormalities such as belt defects, imbalance, wear and resonance are usually associated with belt vibration, on-line monitoring and characterization of belt vibration could serve as an effective and reliable tool for the fault diagnosis and failure prognosis of the machinery [1].…”

“…The electrification of dielectrics is a ubiquitous phenomenon in the industries. By making good use of this phenomenon, the electrostatic sensors have been used to achieve a variety of monitoring and diagnostic objectives, such as flow characterization of particles in pneumatic conveying pipelines [1], [2] and gas-solid fluidized beds [3], [4], detection of gas path debris for health monitoring of an aero-engine [6], [7], condition monitoring and failure prediction of a taper roller bearing [8], and speed measurement of rotating shafts [9] and running strips [10]. Recent studies have found that a power transmission belt moving both axially and transversely generates a fluctuating electric field that can be detected using an electrostatic sensor [11].…”

Statistic-Based Method to Monitor Belt Transmission Looseness Through Motor Phase Currents

“…Belt-pulley systems are extensively employed in industrial applications such as compressors, pumps, fans, etc. The main advantages of belt transmission are its high efficiency, the nonnecessity of aligned shafts, its tolerance for misalignment, and its low cost [16]. They are generally composed of two pulleys, one or several belts, and eventually other mechanical elements (tension roller, guide roller, etc.).…”

Effects of transmission belt looseness on electrical and mechanical measurements of an induction motor

“…and especially flat and trapezoidal belts (or V-belts). This extensive use is mainly due to their benefits such as their high efficiency, the non-necessity of aligned shafts, their tolerance for misalignment and their low cost [18]. However, belt-pulley systems are subject to wear and mechanical fatigue and can therefore lose their mechanical properties during their lifetime.…”