Showing papers on "Condition monitoring published in 1986"

Failure Diagnosis and Performance Monitoring

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Condition monitoring of electrical drives

Abstract: This paper outlines an approach to the monitoring of electrical drives by the method of axial flux sensing. It is shown that it is possible to detect a variety of faults using a single noninvasive sensor. A prototype system design incorporating several novel features is also discussed, and experimental results presented.

Condition Monitoring of Electrical Machines

Abstract: Condition monitoring of electrical machines is recognised as being crucially important to reliable and economical plant operation, particularly in large installations. Choice of monitoring parameters is discussed. Practically viable condition monitoring schemes are proposed.

Condition monitoring of electrical equipment in nuclear power plants

Abstract: This paper presents the results of a review of maintenance methods that may be considered for condition monitoring of equipment in a nuclear power plant. Some of these methods are presently being used on instruments and equipment whose performance is governed by the plant technical specifications. Other methods are being used to monitor the condition of heavy power production equipment in the plant. From a survey of eight utilities which have or will soon have operating generating stations it was found that eM was not being used on light equipment or environmentally qualified equipment. An exception is the monitoring of drift in pressure transmitters by some utilities. An explanation for the lack of widespread use of condition monitoring (CM) is the uncertainty over the cost effectiveness and reliability of the test methods to yield unambiguous information. A purpose of CM is to optimize the preventive maintenance program by adjusting the tests performed and the schedule to the unique requirements of the equipment. By showing the changing condition of the equipment with time, CM may also be able to predict when certain criteria will be reached in the future. CM programs to demonstrate the ability of certain tests to show a correlation between degradation and the measured parameter and to establish criteria for judging the condition of the equipment could help remove some of the ambiguity that now exists.

Interpolation Techniques for the Time Domain Averaging of Vibration Data with Application to Helicopter Gearbox Monitoring

Abstract: : Interpolation techniques provide an alternative to the phase-locked frequency multiplier for the calculation of the time domain average of a vibration signal. Higher order interpolation techniques produce flatter passbands and lower sidelobes in the stopband but require longer calculation times. Aliasing errors are introduced into the result by replication of the sidelobes during interpolation. In general, the errors are attenuated by time domain averaging, but under some conditions may be passed without attenuation. Keywords: Gear boxes, Helicopter, Signal averaging, Condition monitoring, Australia.

Condition monitoring equipment for power output devices

Abstract: Power output devices such as thrusters, hydraulic rams, motor/gearbox combinations, and valve actuators are used in situations where the highest reliability is mandatory. Condition Monitoring Equipment 5 uses a suitable transducer 6 to measure the output of such an output Device 1 in response to a command input at 2. This measurement is repeated at frequent intervals during the execution of the command, and from this series of measurements various parameters indicative of performance are calculated. The equipment 5 may contain a model of the device 1, perhaps including the load 4 and associated control system (10), which in conjunction with the command (measured by a second transducer 7) is used to calculate the expected system response. From this calculated response is derived a set of target parameters, which are compared with the measured parameters. By comparisons between the measured parameters and the target parameters, any malfunction or deterioration of performance can be detected, and displayed remotely 8 or locally 9.

Radio Frequency Diagnostic Monitoring of Electrical Machines

Abstract: RF diagnostic monitoring should make it possible to improve machine maintenance schedules and achieve more time in service.

Automated fault diagnosis

Abstract: Machinery condition monitoring and fault diagnosis using a fault matrix and process deviation approach is described. In particular the application of computer aided diagnosis using an expert system based on artificial intelligence is considered. A prototype fault finding system has been developed and tested. Some examples from this system and some more recent results from an ongoing research programme are outlined.

Educational Needs in Condition Monitoring and Diagnostics Engineering and Management (COMADEM)

Abstract: All industrial nations depend for their existence upon their manufacturing activities. These activities impinge upon the national ecology and the health of the nation: on them we rely for our standard and quality of living. Our ability to manufacture competitively is, in turn, dependent upon the manner and quality of our technical educational system. Our unenlploynlent figures reflect our failure to be competitive; we are insufficiently aware of the importance of today's high technology to manufacturing industry. That we improve in the quality and reliability of our products is of crucial in1portance, and this will not happen unless we develop our educational skills and the framework in which they are learnt. Such skills apply not only to all branches of engineering, but also to management functions at every level from top to bottom. The choice and maintenance of plant, machinery and process are both engineering and management functions. The wrong choice, and/or bad maintenance, will erode, often significantly, industrial profit margins. Indeed there is much well documented evidence to suggest that millions of pounds have been spent unnecessarily in order to maintain expensive and productive plant because condition monitoring has been indifferent, diagnostic techniques have been unused, and engineering management has been poor, so providing a combination which earns the acronym 'COMADEM'. The object of this paper is to daw attention to the need to introduce this multi-disciplinary overall view into modern engineering courses. The success of any manufacturing organisation depends, in part, upon the soundness of the philosophy behind its approach to equipment maintenance, and the way in which that philosophy is applied. Neither the perfect practice of a false philosophy or indifferent practice of a perfect philosophy can compete against organisations which achieve the correct mix. All plants and machinery deteriorate, often slowly at first then faster and faster as parts wear out as tolerances grow greater, resulting eventually, if no maintenance is practised, in complete failure. To avoid such a catastrophe plants and machinery have to be properly monitored; if incipient faults are not detected or if the diagnosis of faults is incorrect and faults neither prevented nor cured, the inevitable result will be:

Health monitoring of machinery and its effects on minimum manning levels

Abstract: Where minimum manning levels are being used, it is essential that a vessel's machinery plant be efficient and that necessary support and monitoring equipment be available to maintain the plant with minimum effort and cost. This paper highlights the latest technical aids, suggests how equipment manufacturers can assist the shipowner, and shows how an onboard computer can be used to the benefit of ships' staff.

Chemical Analysis Strategies for Water Quality Monitoring

Abstract: Water quality monitoring studies typically include chemical parameters such as nutrients. Detection limits, precision and accuracy in the chemical analysis of these parameters can have a major impact upon data analysis and tests of hypotheses posed by monitoring studies. The analytical techniques used to measure these chemical parameters, however often do not receive the same scrutiny applied in the selection of other study design elements. Examples from actual monitoring programs demonstrate the importance of selecting appropriate chemical analysis strategies.