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In industrial electrical drives has been traditionally employed the technique of analysis the technique of analysis of vibration to detect misalignment between the motor axes and the load. This technique requires the placements of sensors directly on the drive, which makes it difficult to apply. In some cases, it may be impossible to apply (submerged or hard access drives). Recently, as complement...
In this work we discuss the efficiency of various stator current signatures for monitoring shaft misalignment that could affect mechanical systems when driven by an induction machine speed-controlled. In that respect, we have considered the Motor Current Signature Analysis, the Current Space Vector, and the Current Park Loci, under no-load as well as under full load conditions. On the other hand,...
As the core component of rotating machinery, rotor system is often subjected to the different torque load in the operation process, resulting in the change of bearing load, system vibration and friction behavior between axis and bearing. Further, the operation situation of rotor system is changed. At present, the perfect conclusion has not been formed to identify torque load of rotor system. In this...
Process and facility on-line monitoring and diagnostic technologies have been developed and deployed in China Steel Corp. (CSC). It has proven itself to assist operators to prevent or alleviate process instability by grasping all key information in time. Some case studies in iron-making, iron-ore sintering, and hot strip rolling process are demonstrated to show that various sensing technologies and...
A experiência tem demonstrado que o surgimento de vibrações em frequências múltiplas da freqüência de alimentação é sempre uma fonte de confusão e desentendimento entre os departamentos de manutenção elétrica e mecânica. Este artigo faz uma breve revisão bibliográfica do assunto, reapresenta as causas comuns deste tipo de vibração e exemplifica a sua ocorrência em um caso real em desenvolvimento.
This paper addresses the application of stator current spectral analysis for the detection of cage bearing damage in induction machines. Vibration monitoring of mechanical bearing frequencies is currently used to detect the presence of a fault condition. Since these mechanical vibrations are associated with variations in the physical air gap of the machine, the air gap flux density is modulated and...
Accelerometer data has been gathered from accelerated conditioning in grease lubricated and lubrication deprived gear meshes in AH-64 helicopter intermediate and tail rotor gearbox, which are commonly problematic components of the Apache helicopter platform. These tests were performed in a controlled drive-train research test bed, simulating drive-train conditions to improve diagnostic and prognostic...
This paper introduces the accidents that are prone to happen in the engine bench test and the need for real-time monitoring of the engine test, explains the working principle of the real-time monitoring and early-warning system, analyses the classification of engine faults and why they generate, builds the real-time monitoring and early-warning system of the engine bench test, determinates the type...
To avoid unexpected equipment failures and obtain higher accuracy in diagnostic for the predictive maintenance of induction motors, on-line health monitoring system plays an important role to improve the system reliability and availability. Among different techniques of fault detection, work on motor current signature analysis by using only stator current spectra has been well documented. In addition,...
For solving large rotation shaft fault physics diagnose problem on torsional vibration of heavy-duty machinery, a new torsional vibration continuous shaft segment mass model was proposed by using Kinetics theory and measuring theory, which could derive torsional vibration parameter of indirect extracting fault point on-line. Analysis and processing data of actual torque measurement on the large rotation...
For solving on-line extract torsional vibrating parameter detecting and metrical problem of spanless point of complex and precise heavy machinery large scale rotary driving shaft, a new torsional vibration continuous shaft segment mass detecting and analytic model was proposed by using kinetics theory and measuring theory. The new method established the vibrational transmission relationship between...
For solving measurement problem of spanless points of complex rotary mechanical drive system, a new torsional vibration measuring model of spanless points was proposed by using continuous shaft segment model. The measuring model could calculate torsional vibration parameter values of spanless points utilizing testing data of measurable points. The correctness of theory was verified by torque testing...
The aim of this paper is to analyze experimentally the stray flux spectrum of a three phase induction machine in an electromechanical system, in order to show how it is influenced by the gearbox behavior. The mechanical monitoring in the electromechanical systems has been mainly studied using vibration signals. Recently, some works have been performed in order to monitor the mechanical part by using...
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