Showing papers on "Condition monitoring published in 1978"

Condition monitoring by thermography

Abstract: Thermography techniques are used to monitor both the temperature and the temperature pattern of equipment in operation. This information, together with data on the physical construction of the component and the thermodynamic state of the equipment is used to evaluate the degree of deterioration of an item of process plant. Three successful applications of thermography to different industries are described.

Software techniques for a microprocessor-based data acquisition device

Abstract: A Vehicle Monitoring System (VMS) based on the RCA 1802 microprocessor, was de veloped for recording the use, condi tion, and maintenance action experienced by military vehicles in their day-to-day operation. Data are collected over a period of up to one month by an unat tended on-board monitoring unit and are stored in a highly compacted digital form for later analysis. A multi-task ing operating system enables the real time monitoring of 18 digital and 25 analog parameters. Data predefined as "non-significant" are discarded, while significant data are saved in a 15-k byte storage area in the form of both detailed profiles and summary indicators and histograms. Retrieval of data is accomplished through the use of an off board cassette unit which can also be used to modify the control software of the monitoring unit. The data can then be analyzed by an off-line computer system to extract information relating to vehicle design and performance, effectiveness of maintenance programs, and causes or precursors of vehicle component failures.

Cost Effective Condition Monitoring

Abstract: The concept of condition monitoring (CM) has received much attention in the 1970's and it is a key factor in the maintenance strategy of most airlines and defence forces. Recent surveys suggest a realiseable potential saving in British industry of over $400 million p.a. if CM was intelligently applied. In Australia a saving of $130 million p.a. should be possible. Some Australian companies use specific CM techniques though most have been apathetic about its general principles and application. The lack of guides and information, and an early emphasis on the use of sophisticated techniques and equipment were inhibiting factors. Condition monitoring practices and principles are sound, essentially simple and cost effective. This brief paper attempts to show how CM can be made to work for you. Discussion is limited to on-line rotating machines and to simple manual methods.

Condition monitoring of marine diesel engines

Abstract: This article describes ASEA's system CYLDET-CM for the condition monitoring of marine diesel engines. The system is based partly on the use of completely new types of sensor. It is built up from modules from the ALSY-8 alarm system and the microcomputer-based digital electronic system DS-8.

Assessment of Augmented Electronic Fuel Controls for Modular Engine Diagnostics and Condition Monitoring

Abstract: : Fault isolation to the module and line replaceable unit (LRU) level by means of a Diagnostic and Condition Monitoring (D and CM) System integrated with a Full-Authority Digital Electronic Control (FADEC) is evaluated in this study A preliminary assessment of the D and CM system parameters required for performing the diagnostic functions on the current T700 engine is also included in the study

Ate and aircraft mechanical diagnostics

Abstract: The Army is committed to fielding a family of automatic test support systems (ATSS) to support all Army materiel. The current plan is to field the AN/USM-410 "third generation" ATE. The Army has also sponsored a significant amount of work aimed at achieving an "on condition" maintenance philosophy for major aircraft sub systems by monitoring turbine engine performance, engine mechanical condition, health of various rotating dynamic components, hydraulic systems, and structural integrity of the aircraft. The objective is to investigate the viability of accomplishing the aircraft condition monitoring and diagnostic task using ATE. Significant points are the following: non-intrusive monitoring of aircraft mechanical systems is possible; impressive benefits can be attributed to this approach, but several attempts at fielding such a system have been terminated because of excessive initial in vestment costs; and mechanical diagnostics is not a simple extension of a measurement capability.

New ship technical control systems for the royal norwegian navy

Abstract: In 1975, the Royal Norwegian Navy entered an extensive new construction program. In this connection it was necessary to decide the future policy of machinery control techniques. Working groups consisting of members from the Naval Material Command, Norway, and the Ship Research Institute of Norway have developed a new operational management system including Condition Monitoring concepts and Data Techniques. The system consists of two basic parts, the shipborne system (SHIPCON) and the shorebased system (SHORCON). The principles have up to now been applied to various projects, of which details of two are given. The system is based upon micro-computer techniques and data storage on magnetic tape for Condition Monitoring--and Pattern Recognition processing ashore. Efficient man-machine communication has been accomplished by means of alpha numeric displays and graphic color monitors. For the first project it was necessary to keep weight and volume of the control equipment at an absolute minimum. Due to high speed, light weight, 4-stroke engines, condition monitoring data cannot always be accomplished by direct measurements. Methods for indirect establishment of parameter values are therefore introduced. Additional data processing onboard is provided for special monitoring of certain short trend condition developments. For the second project, graphic color screen monitoring methods are utilized for supervision of remote controlled systems.

Overall monitoring of offshore structures by vibration analysis

Abstract: Although the design of offshore platforms has improved markedly in the last ten years, a similar improvement cannot be reported in the arrangements made at the design stage for platform inspection; consequently there are more than a dozen platforms in the northern sector of the North Sea which are proving both difficult and costly to inspect. In these cases vibration analysis is advocated to compensate for reduced underwater inspection, offering the following advantages: (i) vibration monitoring will ensure that the severance of a major structural member can be detected; (ii) a damaged or suspect platform can be monitored under all conditions to ensure that there is no further loss of structural stiffness; (iii) by reason of the constant checking of structural integrity it may be possible to justify removal of some de-rating restrictions; and (iv) vibration monitoring can be used to ascertain, under all environmental conditions, when a platform is structurally fit for re-occupation and start-up. Order from BSRA as No. 52,188.

Vibration measurements to monitor faults in rotating machines

Abstract: The paper describes an experimental study of vibration measurement and analysis by means of a special test rig in which certain faults could be induced. Two main faults were investigated, i.e. "our-or-balance" and "misalignment". Order from BSRA as No. 51,067.